JPH0854839A - Color image display device - Google Patents

Abstract

(57) [Abstract] [Purpose] A screen made of red, green, and blue light-emitting elements, especially a large-screen display, thins out specific elements while maintaining a complete color display display, and reduces the cost and configuration. Simplification of. [Structure] Red, green, and blue light-emitting diodes are combined to form one unit pixel, and when these unit pixels are combined to form a unit panel, the blue of the unit pixel that has the lowest eye sensitivity is formed. The light emitting diodes are thinned out and scattered evenly so that the same accuracy as in full color display can be maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called large-screen display device which has a large screen and can be seen well from a distance, and in particular, a color image using red, green, and blue light-emitting elements such as light-emitting diodes. The present invention relates to a display device that thins out light-emitting elements having low visibility among red, green, and blue light-emitting elements to display a color image in a visually uniform manner.

[0002]

2. Description of the Related Art Display devices using light emitting elements in the prior art are disclosed in JP-A-59-15294 and JP-A-62.
As disclosed in Japanese Patent Laid-Open No. 92988/1992, a structure in which red and green light emitting elements are used for displaying a large screen and a fluorescent tube is used for blue light emission is well known.

Further, in displaying a color image using light emitting diodes, light emitting diodes of three primary colors of red, green and blue are configured as one pixel, and the one pixel is arranged in a matrix and each pixel is color-displayed. The structure of a large screen display that displays a color image on the entire matrix is well known.

For example, if the screen size is (3.2 × 2.4)
m, the pixel pitch is 10 mm, and the light-emitting diodes of the three primary colors used are the materials for the blue light-emitting diode (SiC), whose emission wavelength is 465 nm and the luminous intensity on the axis is 2 (m
cd), the green light emitting diode is a (GaP) material, the emission wavelength is approximately 555 nm, and the axial luminous intensity is 15
(Mcd), and the red light emitting diode is (GaAs
It is a material of P), has an emission wavelength of approximately 630 nm, and has an on-axis luminous intensity of 25 (mcd).

In a display having such a structure, the color temperature when the maximum brightness is 230 (cd / m ² ) is 4
It is 400K (Kelvin), and a high-luminance screen can be realized indoors with a viewing angle of 90 degrees horizontally and 50 degrees vertically.

As another example, the screen size is (3.2 × 2.4) m, the pixel pitch is 10 mm, and the three primary color light emitting diodes used are blue light emitting diodes (InGaN). , Its emission wavelength is 450n
m, the axial luminous intensity is 1000 (mcd), the green light emitting diode is a material of (GaP: N), the emission wavelength is approximately 555 nm, the axial luminous intensity is 100 (mcd),
The light emitting diode for red is made of (GaAIAs), has an emission wavelength of about 660 nm, and has an on-axis luminous intensity of 700 (mc).
d).

In the display having such a structure, the color temperature when the maximum brightness is 350 (cd / m ² ) is 6
It is 500 K (Kelvin), and it is possible to realize a screen with a relatively high color purity with a viewing angle of 90 degrees horizontally and 30 degrees vertically.

[0008]

However, in the above-described conventional color image display device using light-emitting diodes using three primary colors, one pixel always requires three-color light-emitting diodes, which is costly. There is a problem that the cost becomes high and the configuration becomes complicated.

That is, in order to display a large-screen color display using a light-emitting element such as a light-emitting diode, (1) as an improvement of optical characteristics, directivity is improved, light utilization efficiency is improved, uniformity, and contrast are improved. , It is necessary to improve the color mixture.

(2) In terms of electrical characteristics, it is necessary to study effective ways of gradation, reduction of power consumption, development of large current power source, and study of γ correction.

(3) Measures for heat treatment in high density
It is necessary to establish mounting technology and mass production technology, measure joints, examine installation and waterproof structure.

(4) With respect to the light emitting diode, it is necessary to reduce the cost of the blue light emitting diode, and therefore, it is necessary to promote active technological exchange in the research and development department.

(5) Regarding the green light emitting diode,
It is necessary to increase the brightness and improve the color purity. Therefore, the pixel array is optimized, the wavelength of the material [InGaN] is increased, and [AI] is increased.
InGaP], it is necessary to shorten the wavelength and promote active technological exchange in the research and development department.

Among these, particularly in one pixel composed of light emitting diodes of three primary colors arranged in a matrix, the efficiency of the blue light emitting diodes is reduced, and the number of color pixels arranged in a matrix based on the efficient reduction. There is a problem to be solved in improving the arrangement state and controlling the gradation.

[0015]

In order to solve the above problems, a color image display device according to the present invention is provided with a red, green,
A color image display device in which a plurality of light emitting elements that emit blue light are arranged, and among the red, green, and blue light emitting elements,
That is, light emitting elements of a specific color are thinned out.

The thinned light emitting element of a specific color is a blue light emitting element; the relationship between the number of thinned blue light emitting elements and the number of green light emitting elements is green light emission. When the number of elements is 1, the number of blue light emitting elements is 1 / N, and N is a positive integer of 2 to 8; the above N is an even number, and the array is arranged in rows or columns adjacent to each other. , The thinned out light emitting elements are arranged so that the thinned out portions are at intermediate positions; the thinned out light emitting elements of a specific color are red light emitting elements;
Regarding the relationship with the number of the green light emitting elements, the number of the red light emitting elements is the same or 1/2 when the green light emitting element is set to 1; the thinned blue light emitting element or the red light emitting element. The array of elements is a color image display device in which the thinned out portions do not become straight lines in one direction.

[0017]

The color image display device having the above-described structure with the specific color thinned out has the following operation.

(1) Of the red, green and blue light emitting elements,
By thinning out the light emitting elements of a specific color as appropriate, it is possible to reduce the cost and simplify the structure.

(2) Since the thinned light emitting element of a specific color is a blue light emitting element, the cost can be reduced.

(3) The number of thinned blue light emitting elements, and
Regarding the relationship with the number of green light emitting elements, the number of blue light emitting elements is 1 / N when the green light emitting element is 1, and this N is a positive integer of 2-8. , The number of thinned-out objects can be freely changed within a predetermined range.

(4) N is an even number, and the arrangement is such that the thinned out portions are arranged in adjacent rows or columns so that the thinned out portions are at intermediate positions, so that the thinned pixels are averaged and scattered. Can be visually even.

(5) Since the thinned light emitting element of the specific color is the red light emitting element, it is possible to thin the light emitting element according to the conditions such as the environment together with the blue light.

(6) The number of thinned red light emitting elements and
As for the relationship with the number of green light emitting elements, when the number of green light emitting elements is 1, the number of red light emitting elements is the same or 1/2
As a result, the accuracy can be maintained even when thinning out.

(7) In the arrangement of the thinned blue light emitting elements or the red light emitting elements, it is possible to maintain the accuracy of color display by preventing the thinned out portions from being straight lines in one direction.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of a color image display device in which specific colors are thinned according to the present invention, with reference to the drawings. [1] Preconditions, [2] Overall configuration, [3] Unit panel structure, [ 4] Thinning method of specific color (blue light emitting diode) of unit panel, (1) Y: W = 1: 1, (2) Y: W =
2: 1, (3) Y: W = 3: 1, [5] Unit panel control, [6] Application example, (1) System configuration for displaying characters and images, (2) System for displaying only images The configuration will be described in the order of (3) system configuration used for monitor of personal computer.

[1] Preconditions The present invention utilizes the unique properties of the three primary colors of red, green, and blue, and therefore it is premised on understanding the general properties of colors. That is, a color is a wave of light, and the light has a predetermined wavelength, and the wavelength range of this light is called ultraviolet light, visible light, or infrared light.

Of these, the wavelength that human eyes perceive is 380.
It is visible light in the range of nanometers to 780 nanometers, which is visible as color. The color distribution for each wavelength of this light is 400-450 nm blue-violet 450-500 nm blue 500-570 nm green 570-590 nm yellow 590-610 nm orange 610-700 nm red.

On the other hand, the sensitivity of the eye is not uniform with respect to the wavelength (hue) of light. For example, as shown in FIG. 1, when the light is bright and when the eye is dark, the ratio of the colored light rays to the eyes can be identified in a wide range of the red region having a long wavelength and the red region having a short wavelength. Is difficult to identify. When it is dark, it is naturally difficult to discriminate as a whole, but it is relatively difficult to discriminate red and it is easy to discriminate purple.

Further, as shown in FIG. 2, it is said that the spectral intensities of the respective colors have the same intensity, for example, the ratio of the color sensation when an energy white ray such as a sun ray reaches the eye, that is, it exists in the eye. As for the proportions of the three primary colors of red, green, and blue that are sensed by the three color receivers, the respective spectral rays overlap each other, and the sum of them is equal to the luminosity curve, as shown in FIG. It is the same as the visibility curve when it is bright.

As described above, regarding the spectral curves of the three-color photodetector assumed to be in the unaided retina, blue is the least sensitive, red is the next, and green is the most sensitive. .

Therefore, based on this assumption, red,
In order to display a color image by arranging three color light emitting elements (light emitting diodes) of green and blue as one pixel in order to display a color image, the green light emitting diode which is most sensitive to the eyes is used as a reference, and the blue Or, even if the unit pixels in which red light emitting diodes are thinned out are incorporated in a matrix arrangement, they should not affect the color image display.

There is another problem here. that is,
This is related to the difference in discrimination between the dark time and the bright time described above, but as shown in FIG. 3, in the chromaticity diagram represented by the CIE chromaticity diagram, the minimum discrimination for distinguishing chromaticity is made. The area differs depending on each location on the chromaticity coordinate. That is, the chromaticity does not correspond to the sensuous color properties. Therefore, it is more rational to determine the color temperature of an actual object after averaging the relationship between the degree of human sensation of color and the chromaticity diagram.

Therefore, in this embodiment, the chromaticity point u in the x-axis direction and the chromaticity point v in the y-axis direction are represented by u in order to average the chromaticity coordinates of the loci of blackbody radiation of the sun. '= (0.7082 · x + 0.2421 · y) / (-
0.15735.x + y + 0.2424) v '= y / (-0.173535.x + y + 0.2424) is converted and displayed. Here, the color temperature of white (W) is 6500K (Kelvin), which corresponds to the standard light source D ₆₅ , and is used when displaying the color of an object illuminated by daylight in clear weather.

Thus, in the embodiment according to the present invention, the light emitting diodes of the three primary colors are arranged so as to be visually uniform. The first is to display blue and red as a normal color image by thinning out blue and red based on the green light emitting diode, and changing the light intensity of the three primary color light emitting diodes as appropriate based on the nature of the color visible to the eye. Therefore, the second is a technical idea in which the luminance of the light emitting diodes forming the three primary colors is appropriately adjusted regardless of the thinned-out configuration or the non-thinned configuration.

[2] Overall Configuration When carrying out the present invention, it is essential to understand the overall configuration of the device. The device 1 according to the invention is
As shown in FIG. 4, an overall control unit 2, a unit panel control unit 3, a drive control unit 4 having a number corresponding to the number of unit panels, and a display panel 6 formed by combining unit panels 5. It consists of

The integrated control unit 2 is constructed so that it can interact with a person such as a so-called personal computer, and the characters and image data (video signals, etc.) to be displayed in color on the display panel 6 are displayed.
R, G, B), signals HS and VS for controlling the unit panel 5
Is output and is connected to the unit panel control unit 3.

The unit panel control section 3 outputs image data (R, G, B, etc.) to the drive control section 4 based on the signals HS and VS from the general control section 2, and is incorporated in the display panel 6. Are connected to the respective drive control units 4 ...

The drive control section 4 controls the brightness and gradation operations of the unit panel 5, outputs data to each unit panel 5 incorporated in the display panel 6, and outputs the three primary colors. It is possible to control up to a maximum of 256 color gradations for each unit pixel that is formed and for each color. or,
Even if there is a thinned blue light emitting diode, the current flowing through the light emitting diode is, for example, 20 mmA to 80 mmA.
The brightness can be controlled by appropriately changing the above. Furthermore, when the unit panel 5 has lines S1 to S16, 4 lines are set to 1
When paired (S1-S4, S5-S8, S9-S12,
In S13 to S16), the S1, S5, S9, and S13 rows can simultaneously control the gradation operation to be turned on. When the 8 rows are set as one set, the S1 row and the S9 row simultaneously perform the gradation operation and the lighting operation is performed.

The display panel 6 has a pixel pitch of 6
mm, screen size (3.2 x 2.4) m, number of pixels 76
It consists of 800 pieces.

In the display panel 6 having such a structure, the maximum luminance is 500 (cd / m ² ) when the color temperature is 6500K (Kelvin). The viewing angle is 90 degrees in the horizontal direction and 30 degrees in the vertical direction, and has a structure capable of achieving a pure color and ultra-high brightness.

In order to form such a large screen, a unit panel 5 made of three primary colors of a predetermined size is formed, and the unit panel 5 is combined with the unit panel 5 described above (3.2 ×).
2.4) Form a large screen of m.

[3] Structure of the unit panel As shown in FIG. 5, the unit panel 5 has a width and width of 94.
Formed in a 4mm square, the end pitch is 2.6mm,
16 pixels vertically and 16 horizontally with the pitch of other pixels set to 6 mm
This is a structure in which individual pixels are arranged. It is needless to say that this numerical value is used for convenience of description and is not limited to this.

Three light emitting diodes for red, green and blue are arranged in each pixel (hereinafter, referred to as a unit pixel) 7 of the unit panel 5 having such a structure.

The light emitting diode used in the present embodiment is characterized in that the blue light emitting diode is formed of a material of [InGaN] and has an axial luminous intensity of 40 when the emission wavelength is 450 nm.
mcd, the light emitting diode for green is formed of the material [GaP], the emission wavelength is about 555 nm, the axial luminous intensity at that time is 6 mcd, and the light emitting diode for the red is formed of the material [GaAIAs]. , The emission wavelength is about 6
The axial luminous intensity is 25 mcd at 60 nm. Needless to say, the combination of these light emitting diodes is not limited.

As will be described later, when red light emitting diodes and green light emitting diodes are used without using blue light emitting diodes in this embodiment, of course, red light emitting diodes are used.
A green light emitting diode is provided. It should be noted that the blue light emitting diode may be controlled not to be driven in a state where three light emitting diodes are arranged, and the same applies when the number of red light emitting diodes other than blue light emitting diodes is reduced.

As shown in FIG. 6, the arrangement state of the light emitting diodes of three primary colors arranged in each unit pixel 7 is as follows.
Two green light-emitting diodes (hereinafter referred to as G), red light-emitting diodes (hereinafter referred to as R), and blue light-emitting diodes (hereinafter referred to as B) are arranged in this order from the left in the drawing at a constant interval. It is in the state of being In this way, G and B are arranged on both sides so that R is sandwiched between
This is because it is possible to enhance the color mixing property when emitting light.

The two Gs have a height of 1.6 mm and a width of 0.8 mm.
Are formed in a rectangular shape and are arranged in parallel in the vertical direction with a gap of 0.4 mm.

R has the same size as G and has a length of 1.
It is formed in a rectangular shape having a size of 6 mm and a width of 0.8 mm, and is arranged in parallel with the spacing of 0.4 mm on the right side of G in FIG.

B is formed in a rectangular shape having a length of 3.0 mm and a width of 2.0 mm, and is arranged in parallel to the right side of R in FIG. 6 with a space of 0.4 mm, and the center of R and the center of the length are the same. Set up. The large size of B is due to the structure provided with the frame. In the case of the structure without the frame, as shown in FIG. And arrange them in parallel on the right side of R with a space of 0.4 mm.

By arranging the three primary colors R, G, and B in the unit pixel 7 shown in FIG. 5 as described above, each unit pixel 7 can be displayed in color, and the unit panel 5 as a whole can be displayed in color. . In addition, each R constituting the unit panel 5,
The driving voltage of G and B is 2.2V for G and R,
B drives at 3.6 volts. For this control, 1
Sixteen unit pixels 7 are arranged on a line, and a unit panel 5 consisting of 16 rows is divided into four equal parts to form a set of four rows. Then, color display is performed by sequentially controlling the driving sequentially from the first of each of the four rows divided into four.

Further, the drive control may be performed by dividing into 8 equal parts instead of 4 equal parts. 2 like this
In the case of equal division, the structure is such that independent terminals can be taken out from each set of 8 rows and drive control can be performed.

[4] Method of Thinning out Specific Color (Blue Light Emitting Diode) of Unit Panel First, the red color, the green color described with reference to FIGS. 6 and 7 above,
Pixels that combine a set of light-emitting diodes that emit three primary colors of blue (hereinafter, referred to as three-primary-color light-emitting pixels) and two pixels of red and green.
An ideal pixel represented by the uniform light emission of each light emitting diode of the three primary color light emitting pixels when arraying in a matrix with a pixel (hereinafter referred to as a two primary color light emitting pixel) having a set of light emitting diodes emitting primary colors. The color is white (hereinafter represented by W), and the color represented by the uniform light emission of each light emitting diode of the two primary color light emitting pixels is yellow (hereinafter represented by Y).

How this W and Y combination can bring the light closer to white light, that is, how the light ray entering the eye is assimilated into white light by the illusion of W and Y combination. Can you let me do it? Generally speaking, if Ws are regularly arranged, it becomes easy to distinguish Y from W. Therefore, it is only necessary to avoid the alignment state, that is, the extremely continuous row and column state and the row or column state with a predetermined angle. Furthermore, it is necessary to avoid lumping W or Y at a predetermined place.

On the other hand, Y in which blue light emitting diodes are thinned out
If a large number of can be used, the cost is reduced and the control mechanism is simplified.

Hereinafter, (1) Y: W = 1: 1, (2) Y:
A specific example of the matrix arrangement state when W = 2: 1 and (3) Y: W = 3: 1 will be described with reference to the drawings.

(1) Y: W = 1: 1 As shown in FIG. 8, simply arranging in the order of Y and W makes Y and W alternate, which is ideal, but when viewed in a row, Y and W are separated. Will end up. If light is emitted in this state, the line is displayed with lines, which is not preferable.

Therefore, as shown in FIG. 9, Y and W having so-called missing portions are arranged alternately in the first row S1 and the second row S2 is the same as the upper row S1. Arrange Y or W that does not become so that Y and W are alternately arranged. That is, a checkered flag type pattern is formed. By doing so, the Ys and Ws in the oblique direction are certainly aligned, but the columns and rows are alternately arranged, so that they are visually evenly arranged.

(2) Y: W = 2: 1 As shown in FIG. 10, two Ws and one W are regularly arranged in rows by using one W for two Ys. In this case, W may be arranged in a line in a diagonal direction in a part of the array. If Y and W are made to emit light in this state, the light emitting state is divided into Y and W, which is not preferable. Therefore, as shown in FIG. 11, the arrangement state of two Ys and one W in a row is not changed, but the arrangement state of Ys and Ws in the column of the next row is changed. That is, in FIG. 11, W is arranged in the front by one in the fourth row S4, and W is arranged in the front by one in the next fifth row S5. In this way, the array pattern of the next row is moved forward and backward without changing the array pattern of the column using two Ys and one W, so that W is aligned in the columns, rows, and diagonal directions. It is possible to avoid a pattern arrangement that is continuous in a row, and a visually uniform state is created, which makes it possible to give the illusion that the color display is based on complete three primary colors.
Therefore, the number of missing parts is set to an even number, and the array is arranged in rows or columns adjacent to each other such that the thinned out parts are in the middle position, and it is as if the light emitting diodes of the complete three primary colors are used. You can do it.

(3) Y: W = 3: 1 In FIG. 12, when three Ys and one W are arranged in a row in a row, the Ws are diagonally arranged in a line. As in the case of (2) above, if light is emitted in this state, Y and W are separated. Therefore, it is necessary to make an arrangement state of Y and W that is harmonized as a whole without changing the arrangement pattern of 3 Y and 1 W, for example, as if it is an illusion that it is W.

Therefore, as shown in FIG. 13, the second line S
The pattern array of Y and W of 2 is a pattern array in which W is two before the array of S1 in the first row,
In the third row S3, the pattern array in which W is moved forward by two is set, in the fourth row S4, the pattern array in which W is delayed by two is set, and in the fifth row S5, the array pattern in which W is advanced by two is set. . By doing so, it is possible to avoid an array state of Ws that are continuous in one column in a diagonal direction, not to mention columns, that is, a missing portion is a straight line in one direction. You can do it.

As shown in the above (1) to (3), the structure is such that the number of Y is larger than that of W, and the pattern arrangement is not changed, and as a whole, a continuous row and a diagonal continuous arrangement state. Even if the structure in which the blue light emitting diode is omitted is changed by changing, the display becomes a visually uniform state, and it is possible to perform a display that causes an illusion as if it is composed of only W. The ratio of Y to W is not limited to the ratio of Y: W = 1: 1 to 3: 1 described above, and may be Y: W = 4: 1 to 7: 1.
Therefore, regarding the relationship between the number of blue light emitting elements and the number of green light emitting elements, when the number of green light emitting elements is 1, the number of blue light emitting elements is 1 / N, and N is a positive number of 2 to 8. Thinning out to an integer can be realized very easily. this is,
The same applies to the relationship between the red light emitting element and the green light emitting element, and when the green light emitting element is 1, the number of red light emitting elements is the same or halved.

Of course, when white characters such as movie subtitles are viewed from a close distance, Y pixels and W pixels are mixed, but as can be seen from FIG. 3, W and Y of 6500K (Kelvin) are seen.
Since the relationship is closer to the relationship between W and Cy (cyan) (G + B) and the relationship between W and M (magenta) (B + R), it is relatively easy to discriminate colors and is not bothersome.

In this way, it is possible to form a unit panel in which the two-primary-color light emitting pixels without B are arranged at appropriate positions. In addition, the two-primary-color light emitting element has a role of increasing the non-light emitting portion, and when it increases, it can reflect the external light and increase the contrast ratio with the light emitting portion.

In addition, the 3 to 4 places where the B is removed are
It can be a column position where the unit panel is attached.

[5] Control of Unit Panel FIG. 14 shows an outline of the unit panel control unit 3, which includes A / D converters 8A, 8B and 8C, a timing circuit 9, and an interface FIFO circuit 10. The connection status is as follows. The overall structure has been described with reference to FIG. 4, so please refer to that.

The input sides of the A / D converters 8A, 8B and 8C are connected to the R, G and B input terminals from the integrated control unit 2,
The output side is connected to the interface FIFO circuit 10, and its control terminal is the clock signal C of the timing circuit 9.
It is connected to the K line.

The input side of the timing circuit 9 is HS / VS
Connected to the signal input terminal, the clock CK line on the output side is connected to the A / D converters 8A, 8B, 8C and the interface FIFO circuit 10, and the horizontal control signal HD line is connected to the interface FIFO circuit 10 for vertical control. The signal VD line is connected to the interface FIFO circuit 10.

The output side of the interface FIFO circuit 10 has blue data output signals B1 to B8, red data output signals R1 to R8 terminals, and green data output signal G.
1 to G8 terminals, reset output signal RE, select output signal SE, bright output signal BR, oscillator output signal O
It is connected to the SC.

The unit panel control section 3 having such a configuration converts the video signal from the general control section 2 into a digital signal and outputs the signals HS / VS in order from the input data.
The data is output to the drive control unit 4 specified by.

[6] Application Example The display panel using the light emitting diodes of the three primary colors in which the specific color is thinned out as described above is not limited to a display installed indoors or outdoors as shown below, and the device can be configured. You can Hereinafter, some application examples will be described.

(1) Device Configuration for Displaying Characters and Images As shown in FIG. 15, the device 1A is a device for inputting a video signal and also for inputting characters from a keyboard as appropriate, and includes an overall control unit 2A and a unit. The panel control unit 3A, the drive control unit 4A, and the display panel 6 are included.

The general control section 2A is composed of a personal computer 24 equipped with a keyboard 23 and a video capture 25, and the keyboard 23 can be appropriately input.

The unit panel control section 3A comprises a timing controller 26 and an A / D converter 27, and supplies not only image data to the unit panel 5 but also character information.

The drive controller 4A has an interface 28.
And supplies image data and character information to the display panel 6.

With such a structure, it is possible to appropriately change the screen using the large-screen display panel 6, and not only the screen display but also
Since the character information can also be displayed in large size, it is extremely effective for advertising.

(2) Structure of the device for displaying only the screen As shown in FIG. 16, the device 1B is adapted to display a video signal on the display panel 6, and the overall control unit 2
B, a unit panel control unit 3B, a drive control unit 4B, and a display panel 6.

The integrated control section 2B is composed of an RGB decoder 29 and an A / D converter 30, and is capable of directly displaying a video signal, for example, a television signal of each channel of NTSC on the large display panel 6. ing.

The unit panel control section 3B comprises a timing controller 31, an RGB controller 32, and a matrix 33, and supplies a video signal to the unit panel 5.

The drive controller 4B has an interface 34.
The image data composed of the video signal is supplied to the display panel 6.

With such a configuration, it is possible to display an appropriately changed screen of video signals by using the large-screen display panel 6, and for example, a neon display for repeatedly displaying a video signal for advertising. It also serves a role and can display a desired image with a simple structure.

(3) System Configuration Used for Monitor of Personal Computer As shown in FIG. 17, it is a system 1C configured to display signals from the monitor on the display panel 6,
It is composed of a control unit 2C, a drive control unit 4C, and a display panel 6.

The control section 2C is composed of a personal computer 36 having a keyboard 35, and a control signal from the personal computer 36, that is, image data is output.

The drive controller 4C has an interface 37.
To supply the image data to the display panel 6.

With such a structure, the image data from the monitor can be appropriately displayed by using the large-screen display panel 6, and the image created by the personal computer 36 can be displayed. It is possible to Needless to say, it is not limited to the personal computer 36.

[0085]

As described above, the display device for thinning a specific color according to the present invention has the following effects.

(1) Of the red, green and blue light emitting elements,
By appropriately thinning out light emitting elements of a specific color, it is possible to display a display that is not inferior to a complete color display, achieve cost reduction while maintaining accuracy, and simplify the structure. Play.

(2) Since the thinned light-emitting elements of a specific color are blue light-emitting elements, it is possible to reduce the number of expensive light-emitting elements as compared with other light-emitting elements and to realize cost reduction. There is an extremely excellent effect that the contrast ratio with the light emitting portion is increased by increasing the non-light emitting portion of the portion, and a clear screen display can be performed.

(3) The number of thinned blue light emitting elements,
Regarding the relationship with the number of green light emitting elements, when the number of green light emitting elements is 1, the number of blue light emitting elements is 1 / N, and this N is a positive integer of 2 to 8 Since the number can be freely changed within a predetermined range, there is an extremely excellent effect that a flexible thinning ratio suitable for the environment can be set.

(4) Since N is an even number and the rows are arranged adjacent to each other so that the thinned-out missing portions are located at intermediate positions, the thinned-out pixels can be averaged. This has an extremely excellent effect that the cost can be reduced and the structure can be simplified while maintaining the accuracy of displaying various color images.

(5) Since the thinned-out light emitting element of a specific color is a red light emitting element, it is thinned out in accordance with conditions such as environment as well as blue, so that the accuracy of color display is maintained. It has an extremely excellent effect.

(6) The number of thinned red light emitting elements,
As for the relationship with the number of green light emitting elements, if the number of green light emitting elements is 1, the number of red light emitting elements is the same, or is 1/2. Has an extremely excellent effect that a color display can be obtained without lowering the accuracy.

(7) In the arrangement of the thinned blue light emitting elements or the red light emitting elements, the thinned out portions are prevented from becoming straight lines in one direction, so that the image disturbance caused by the thinning can be prevented in advance. As a result, an extremely excellent effect that the accuracy of color display can be maintained is achieved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the relative luminous efficiency curves of the naked eye when bright and dark.

FIG. 2 is an explanatory diagram showing a spectral sensitivity curve of a three-color light receiver that is assumed to be located in the unaided retina.

FIG. 3 is a diagram obtained by averaging chromaticity diagrams.

FIG. 4 is an explanatory diagram showing an overall configuration of an apparatus according to the present invention.

FIG. 5 is an explanatory view showing the same unit panel.

FIG. 6 is an explanatory diagram showing the same unit pixel.

FIG. 7 is an explanatory diagram showing the same unit pixel.

FIG. 8 is an explanatory diagram showing an unfavorable arrangement state when the same specific color is thinned out.

FIG. 9 is an explanatory diagram showing a good arrangement state when the same specific color is thinned out.

FIG. 10 is an explanatory diagram showing a bad arrangement state when the same specific color is thinned out.

FIG. 11 is an explanatory diagram showing a good arrangement state when the same specific color is thinned out.

FIG. 12 is an explanatory diagram showing an unfavorable arrangement state when the same specific color is thinned out.

FIG. 13 is an explanatory diagram showing a good arrangement state when the same specific color is thinned out.

FIG. 14 is a schematic block diagram showing the configuration of the unit panel control unit.

FIG. 15 is an explanatory diagram showing a system configuration for displaying characters and images of the same application example.

FIG. 16 is an explanatory diagram showing a system configuration for displaying only images of the application example.

FIG. 17 is an explanatory diagram showing a system configuration used for the monitor of the personal computer of the application example.

[Explanation of symbols]

 1 Device 2, 2A, 2B General Control Section 2C Control Section 3, 3A, 3B Unit Panel Control Section 4, 4A, 4B, 4C Drive Control Section 5 Unit Panel 6 Display Panel 7 Unit Pixels 8A, 8B, 8C A / D Conversion Device 9 Timing circuit 10 Interface FIFO circuit 23 Keyboard 24 Personal computer 25 Video capture 26 Timing controller 27 A / D converter 28 Interface 29 RGB decoder 30 A / D converter 31 Timing controller 32 RGB controller 33 Matrix 34 interface 35 Keyboard 36 Personal computer 37 interface

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 4, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

In a display having such a structure, the color temperature when the maximum brightness is 230 (cd / m ² ) is 4
It is 400K (Kelvin), and it is possible to realize a screen that can be viewed indoors with a viewing angle of 90 degrees horizontally and 50 degrees vertically.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

There is another problem here. It is
As shown in FIG. 3, represented by the CIE1931 chromaticity diagram.
In xy chromaticity diagram, smallest identification zone to distinguish chromaticity is different depending on the position of each of the chromaticity coordinates. That is, the chromaticity does not correspond to the sensuous color properties. Therefore, it is more rational to determine the color temperature of an actual object after averaging the relationship between the degree of human sensation of color and the chromaticity diagram.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

Therefore, in this embodiment, CIE1
The examination was performed using a 960 ucs chromaticity diagram (uv chromaticity diagram).
Here, the chromaticity point u in the x-axis direction and the chromaticity point v in the y-axis direction are converted into u = 4x / ( -2x + y + 12y + 3) v = 6y / (-2x + 12y + 3) and displayed. Here, the color temperature of white (W) is 6500K (Kelvin), which corresponds to the standard light source D ₆₅ , and is used when displaying the color of an object illuminated by daylight in clear weather.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0034

[Correction method] Change

[Correction content]

Thus, in the embodiment according to the present invention, the light emitting diodes of the three primary colors are arranged so as to be visually uniform. The first is to display blue and red as a normal color image by thinning out blue and red based on the green light emitting diode, and changing the light intensity of the three primary color light emitting diodes as appropriate based on the nature of the color visible to the eye. it is and the second is a technical idea where you to appropriately adjust the brightness of the light emitting diodes which constitute the three primary colors regardless configuration and decimated not configured thinned out.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0042

[Correction method] Change

[Correction content]

[3] Structure of the unit panel As shown in FIG. 5, the unit panel 5 has a width and width of 95.
Formed in a square of 2 mm, the end pitch is 2.6 mm,
16 pixels vertically and 16 horizontally with the pitch of other pixels set to 6 mm
This is a structure in which individual pixels are arranged. It is needless to say that this numerical value is used for convenience of description and is not limited to this.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0045

[Correction method] Change

[Correction content]

As will be described later, when red light emitting diodes and green light emitting diodes are used without using blue light emitting diodes in this embodiment, of course, red light emitting diodes are used.
A green light emitting diode is provided. The blue light emitting diode may not be driven by control in a state where three light emitting diodes are arranged, and the same applies when the number of red light emitting diodes instead of blue light is reduced.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] 0058

[Correction method] Change

[Correction content]

(2) Y: W = 2: 1 As shown in FIG. 10, two Ws and one W are regularly arranged in rows by using one W for two Ys. In this case, W may be arranged in a line in a diagonal direction in a part of the array. If Y and W are made to emit light in this state, the light emitting state is divided into Y and W, which is not preferable. Therefore, as shown in FIG. 11, the arrangement state of two Ys and one W in a row is not changed, but the arrangement state of Ys and Ws in the column of the next row is changed. That is, in FIG. 11, W is arranged in the front by one in the fourth row S4, and W is arranged in the front by one in the next fifth row S5. In this way, the array pattern of the next row is moved forward and backward without changing the array pattern of the column using two Ys and one W, so that W is aligned in the columns, rows, and diagonal directions. It is possible to avoid a pattern arrangement that is continuous in a row, and a visually uniform state is created, which makes it possible to give the illusion that the color display is based on complete three primary colors.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0060

[Correction method] Change

[Correction content]

Therefore, as shown in FIG. 13, the second line S
The pattern array of Y and W of 2 is a pattern array in which W is two before the array of S1 in the first row,
In the third row S3, the pattern array in which W is advanced by two is set, in the fourth row S4, the pattern array in which W is delayed by two is set, and in the fifth row S5, the array pattern in which W is advanced by two is set. . Therefore, the number of missing parts is set to an even number, and the array is arranged in rows or columns adjacent to each other so that the thinned out parts are arranged in the middle position, and it is as if the light emitting diodes of the complete three primary colors are used. can do. By doing so, it is possible to avoid an array state of Ws that are continuous not only in columns but also in rows in an oblique direction, that is, a missing portion is a straight line in one direction, and it is as if only W is configured. You can do it.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

FIG. 3 is a CIE1960ucs chromaticity diagram.

[Procedure Amendment 10]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

Claims (7)

[Claims] 1. A color image display device in which a plurality of light emitting elements that emit red, green, and blue light are arranged.
A color image display device characterized by thinning out light emitting elements of a specific color among green and blue light emitting elements. 2. The color image display device according to claim 1, wherein the thinned light emitting element of a specific color is a blue light emitting element. 3. The number of blue light emitting elements thinned out,
Regarding the relationship with the number of the green light emitting elements, the number of the blue light emitting elements is 1 / N when the green light emitting element is 1, and the N is a positive integer of 2 to 8. The color image display device according to claim 2. 4. The color image display device according to claim 3, wherein the N is an even number, and the rows are arranged in rows or columns adjacent to each other such that the thinned-out missing portions are at intermediate positions. . 5. The color image display device according to claim 1, wherein the thinned light emitting element of a specific color is a red light emitting element. 6. The number of thinned red light emitting elements,
6. The color according to claim 5, wherein the number of green light emitting elements is the same as or one half of the number of red light emitting elements when the number of green light emitting elements is one. Image display device. 7. The arrangement of the thinned blue light emitting elements or red light emitting elements is such that the thinned out missing portions are not straight lines in one direction. Color image display device.