JPH0451453A - Color image display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color image display device in which pixels have a discrete configuration and a color filter is attached to each pixel.

[Conventional technology]

2. Description of the Related Art An example of a conventional color image display device in which pixels are arranged in a discrete manner is a large screen display device that can provide a color image to a large audience.

A large screen display device is constructed by two-dimensionally arranging a large number of three types of phosphors that emit red, blue, and green light.

As a fluorescent display section constituting such a large screen display device, there is one disclosed in, for example, Japanese Patent Laid-Open No. 1-239757. FIG. 7 is a front view showing the structure of a fluorescent display section of a conventional device, and FIG. 8 is a cross-sectional view taken along the line -■ in FIG. In the figure, (1) is a vacuum envelope made of glass, which consists of a front panel (2), a back plate (3), and a cylindrical side plate (4), and is hermetically sealed. (5) is a fluorescent display section formed on the inner surface of the front panel (2), in which each of the three color phosphors R, G, and B is coated and arranged in a matrix as a unit pixel. 5R) (
5G) (5B). Here, phosphor (5R)
(5G) The subscripts of (5B) are red (R) and green (
G) and blue (B), respectively. Furthermore, in order to increase the resolution and surface brightness of the color image display device, the number of green phosphors (5G) in the fluorescent display section (5) is greater than the number of red and blue phosphors (5R) (5B). (
6) is each phosphor (5R) (5G) of the fluorescent display section (5).
) (5B) is an anode electrode group consisting of a plurality of accelerating anodes (61) (62), etc. arranged correspondingly around the periphery of (5B), and these accelerating anodes (61) (62)
. . . - is applied with a high electric current through an external terminal (I[i). (7) is the fluorescent display section (5)
Electron-emitting cup-1<' (711) to (744) corresponding to each phosphor (511) (5G) (5B)
(Only 721-72. Figure 7 ■ 0 or German N″l
These cathodes (7z) to (744) have both ends facing toward the back surface k(3)-
It is supported between a pair of supports fixed to JZ.

Here, the first and second subscripts of cathodes (7+1) to (74) correspond to the first to fourth rows and first to fourth columns, respectively. Note that each cathode (711) to ( 744),
For example, an indirect heating type in which an oxide is coated on the N1 sleeve or a direct heating type in which an oxide is coach inked on tungsten can be used. (8) is this cathode electrode group (
7) and the fluorescent display section (5) is a group of control electrodes consisting of control grids (82 only) for line selection. , ) to (84), there are cursors in the row direction corresponding to each of the phosphors (5R), (5G, and 5B) of the fluorescent display section (5), respectively, from (711) to (744). In order to pass the electron beam (11) as a non-convergent beam, passing holes (9,) to (94) are provided.

(10) is attached to each phosphor (5R) ( 5G) (5B)
Corresponding to the above, stripe-shaped column selection back electrodes (+01) to (+04) are arranged opposite to each other in the column direction.
), and these back electrodes (101
) to (104) are formed from conductor layers such as A, . Each of the back electrodes (101) to (+04) is
By applying a negative potential and a positive potential of OV or several V to the potential of each cathode (7++) to (744), the electric current f-heam (11 ). Note that (12) is connected to the cathode electrode group (7) from the back plate (3).
, the external end r- for drawing out each electrode of the crit electrode group (8) and the back electrode group (lO) to the outside is a glue=1·line. (20) has a filter layer, 1+'+i1
It is attached to the surface of the face pile (2).

(20R) is a red filter, (20G) is a green filter,
(20B) is a blue filter. Red filter (201 (
)as well as[! 1 filter (20B) respectively contains a red pigment, such as chrome vermilion, and a color pigment, such as a group, one and a high ivy: 20 and 911, 0
The green filter (20G) is a mixture of ink with a ratio of 5.5% of a green pigment, such as cobalt green, and a binder of 5.5%.
This is obtained by applying an ink mixed at a ratio of 94.5 to 94.5 to the surface of the front panel (2). Each color filter (2O
R) (20G) (20B) is attached to cover the corresponding color phosphor (5R) (',]G) (5B). Red, green and 1I single color filter (20R
) (20G) (2011) was adjusted to be 75%. (2
1) is a lens array for condensing light from the front panel (2) of this vacuum envelope (1), and each phosphor (5)
R) (5G) (5B) compatible lens (2N
-1), and is made from an acrylic injection molded product. The lens (2111) has a viewing angle of 120 in the water direction.
This ensures a viewing angle of 60 degrees in the vertical direction, and the gain on the optical axis -F is 1.34 times. (22) is 1)1 with γf equipped with lens array (2I) and filter layer (20).
This is a transparent adhesive that joins the front panel (2).

Next, we will explain the movement ('l). First, each back electrode (io
When n) to (104) have a negative potential with respect to the potential of cathodes (7°1) to (744), cathodes (7+1) to (7
Since no electrons are emitted from the cathode (711)
) to (744) do not flow to the control lid (8) and the acceleration anodes (61), (62), etc., and are in a cut-off state.

Therefore, with respect to the potential of the cathode (7+1) to ("r44), the above-mentioned back electrode (+01) to (10,1)
When a positive potential of 2OV or several V is applied, the cathode (71
Electron beams (11) emitted from 1) to (744) flow toward the control grid (8). At this time, the potential of each control grid (8) is
4), the electron beam (11) passes through the electron passage holes (91) to (9) of these control grids (8).
4), the electron beam (11) cannot pass through the accelerating anode (
61) (62)..., each phosphor (5R) (5G) (511) of the fluorescent display section (5) does not emit light. Then, the potential of the control grid (8) is 1'' of 11 with respect to the cathode (711) (744).
When the position of
Each phosphor (5R) (5G) (5B) is caused to emit light. Therefore, each of the above phosphors (5R) (5G) (5B
) By controlling the combination of the control crits (8) and the back electrodes (101) to (+04) arranged in a matrix in correspondence with and applying a potential, each of these intersecting phosphors (5R) ( 5G) (5B) can be emitted.

Next, the functions of the filter layer (20) and the lens array (21) will be explained with reference to FIG. 9 and FIG. 1O. Figure 9 shows the emission spectra (30R) (30G) corresponding to each phosphor (5R) (5G) (5B).
(30B), Figure 10 shows the color filter (201
1) Spectral transmittance curves (31R) (3H; ) (31
B ) and a diagram showing the spectroscopic spectrum (32) of sunlight. In FIG. 1O, a specific luminous efficiency curve (33) representing the sensitivity of the eye to the wavelength of light is shown as a dotted line. Each phosphor (
5R) (5G) (5B) is made of a highly reflective phosphor, so if there is no filter layer (20), it will shine brightly under external light such as sunlight even when it is not emitting light, and the contrast will be low. There is a risk of inviting low-ranking people. Therefore, each phosphor (5
R) (5G) Emission spectrum of (5B) (30
R) (30G) (30B) and the spectral transmittance curve (31R) (31G) (
Color filter (20R) (20G
) (20B) to each phosphor (5R) (5G) (
5B), each phosphor (5R)
(5G) selectively transmits light from (5B) and attenuates most of the sunlight. Also,
The light from each phosphor (5R) (5G) (5B) is filtered through a color filter (20++) (20G) (20
B), or the sunlight passes through a color filter (20R
) (20G) (20+1) at the time of incidence and 2 at the time of reflection
Due to the multiple passes, the light attenuation effect of the filter layer (20) is greater for sunlight. Each phosphor (5R) (
5G) The light from (5B) is passed through a color filter (201+
) (2[]G) (20+1), and the brightness of the fluorescent display section (5) decreases to 75%, but the light condensing effect of the lens (21B) attached to the front of the fluorescent display section (5) Eventually it will return to normal. In this way, by placing the filter layer (20) and lens array (21) on the front surface of the fluorescent display section (5), the luminance of the fluorescent display section (5) can be maintained without reducing the luminance of the fluorescent display section (5). This suppresses the effects of light reflection and improves contrast.

In addition, as shown in FIGS. 9 and 10, the emission spectrum (30G) of the green phosphor (5G) and the peak of the specific luminous efficiency curve (33) almost match, so the color image display device In order to increase the resolution and surface brightness of the fluorescent display section (5), the number of green phosphors (5G) is greater than the number of red and blue phosphors (5R) (5B).

[Problem to be solved by the invention]

Conventional color image display devices are configured as described above, so that after the light incident from outside the fluorescent display section and reflected by the phosphor passes through the color filter, the green component increases in the fluorescent display section, resulting in a black color. There was a problem in that low brightness colors such as yellow and brown could not be displayed correctly.

This invention was made to solve the above-mentioned problems, and it is an object of the present invention to provide a color image display device that can correctly display colors with low brightness such as black and brown.

[Means to solve the problem]

The green filter of the color image display device according to the present invention is made of green ink containing a green pigment mixed with at least one of red and blue pigments in a predetermined ratio, and is provided to cover the light emitting surface of the green phosphor. be.

[Effect]

The green filter of the color image display device according to the present invention transmits not only green but also a small amount of red light among the sunlight that enters from outside the fluorescent display section and is reflected by the green phosphor, so that the green filter becomes part of the green light. illuminate the area with white light.

(Embodiment) An embodiment of the present invention will now be described with reference to the drawings. Section 1 shows the structure of the small part of the fluorescent display of the color double-image display device according to the present invention. Fig. 2 is a cross-sectional view of section II-II in Fig. FIG. FIG. 4 is a diagram showing the spectral transmittance curve of the color filter used in the device. The dotted line is for the green filter used in the conventional device shown for comparison. In the figure, (200G) is the green filter of the device according to the present invention, in which the weight ratio of chrome vermilion, which is a red pigment, and binder is 2.0 and 98.0.
An ink prepared by mixing cobalt green, a green pigment, and a binder in a weight ratio of 5.5 and 945 was mixed in a weight ratio of 85:15, and the mixture and the binder were mixed in a weight ratio of [I5:35]. The mixed ink was applied to the front panel (2) to give a transmittance of 75%. (310G) is the spectral transmittance curve of the green filter (200G). The other parts are the same as the corresponding parts in the conventional apparatus shown in FIGS. 7 to 10.

Next, the operation will be explained. The light emitted from each phosphor (5R) (5G) (511) of the fluorescent display section (5) passes through the corresponding color filter (2011) (20
0G) (20B). The emission spectrum after passing through the red filter (2 leaves) and the divination filter (20B) is the same as that of the conventional device. On the other hand, green filter (200G
) has a spectral transmittance curve different from that of the conventional green filter, as shown in FIG. The emission spectrum (30G) of the green phosphor (5G) is L6(λ), and the spectral transmittance curve (3]G) of the green filter of the conventional device is F,6(λ),
Green filter (200G) (7) Spectral transmittance curve (3+
OG) is expressed as F 2G (λ), then the filter layer (2
0) The emission spectra after transmission are LG (λ
)XFIG(e), L, (λ)×F26(λ). Here people represent wavelengths of light. As shown in Figure 4, F 2G (λ) is compared with Flu (λ);
The part of the wavelength where LL,(e) takes a peak is very small, and becomes sharper on the long wavelength side where LL,(λ) becomes considerably smaller. Therefore, the emission spectrum La(λ)XF+c(λ) after passing through these two filters and LG
(^)×F2G(λ) is the wavelength (=
There is almost no difference near J, and Z is affected by wavelengths in the D1 range, where the components are small compared to the peak value, and the influence of that difference is small. Therefore, the total fluorescence of the emission spectra of these knees is approximately equal, and the brightness and chromaticity during operation of the device of the present invention are almost the same as those of the conventional device.

Next, when there is no light emitted from the fluorescent display section (5), sunlight passes through the filter layer (20), is reflected by the fluorescent display section (5), and then passes through the filter layer (2o) again. Since the light spectrum transmitted through the red filter (20R) and the blue filter (20B) is the same as in the conventional device, the effect of the green filter (200R) on the color of light in the fluorescent display section (5) is
The effect of G) will be explained in comparison with a conventional green filter.

Assuming that the reflectance of the green phosphor (5G) is 100% and the spectrum of sunlight is expressed as Ls (λ), the sunlight that passes through the green filter (200G) and the conventional green filter at the time of incidence and reflection. The reflection spectra of RI
G(λ)=LS(λ)X(FIG(λ)) 2 and HiR
2G (^) - L, s (^) x (Fza (person))
It is represented by 2. As shown in Figure 10, the spectrum of sunlight has a constant intensity over the entire wavelength range, so the reflected light spectrum after passing through the light filter has the wavelength bo.

The light passing through the green filter (200G) near nm is larger than that of the green filter of the conventional device. A chromaticity diagram based on the CIE (Commission Internationale de l'Eclairage) system shown in FIG. 5 is used to express the color when mixed colored lights are emitted. The numbers in the graph represent wavelengths in nm. The abscissa indicates the X primary color and the ordinate indicates the relative amount of the X primary color. The area near the go side apex of the area of the square shape in the coordinates is green, the area near the right side apex is red, and the area near the bottom apex is blue. The inside of the circle near the center is white (1'l) (I4) The area of light and the center point W are white points and are points where x=y=z. Here, x=X/ (X+Y+Z), yY/(X+Y
+Z) and z=Z/(X+Y+Z). X,
Y and Z are the tristimulus values of the light source in the CIE color system, and the values are the 1931 color matching functions x, y, and Z of the CIE color system, reflected by the fluorescent display section (5), and after passing through the filter layer (20). It is obtained as the value obtained by integrating the product with the sunlight spectrum over I+1' visible wavelength. The isochromatic numbers x, y and Z are for each wavelength!
It shows the mixing ratio of the three primary colors in the 11-color light, and is represented by the curve in Figure 6. Green filter (7,0
OG) or transmits more than the conventional green filter 1-600n
...Light with wavelengths around this deviates from the peaks of the y and Z color matching function curves and does not actually affect the display state of the fluorescent display section (5), but it coincides with the peak of the X curve. ,
Therefore, in sunlight after passing through the green filter (200G), the value of X, that is, the value of X increases compared to the conventional case.

In a conventional color image display device, the reflected light from the fluorescent display section (5) contains more green components than other color components, so the reflected light from the fluorescent display section (5) is In the chromaticity diagram of FIG. 5, it is located slightly to the upper left of the white area. Here, the red filter (20R) and blue filter (2011) are the same as in the conventional device, so this invention is equipped with a green filter (200G) that transmits more light with a wavelength around 600 nm than the conventional green filter. In the color image display device, when the entire fluorescent display section (5) receives and reflects white light such as sunlight, the surface area of the green phosphor (5G) is larger than that of the phosphor of another color (5R) (5
Even if it is larger than 11), the reflected light from the fluorescent display section (5) contains red, blue, and green components equally and becomes white light in the fluorescent display section (5).

In addition, in the above-mentioned example, a green filter (200G) was made using an ink in which green filter ink and red filter ink were mixed at a weight ratio of 85:15, and the mixture and a binder were mixed at a weight ratio of 65:35. I made a green filter with a weight ratio of 90 to 80 and a corresponding red filter of 10 to 80.
Even if a green filter is made by using an ink mixed with 20 to 55 in the reprint ratio and a corresponding ink mixed with 25 to 45 in the binder, the same effect as in the above embodiment 1-1 is obtained.
Ru.

In addition, red pigments include cadmium red or red red pigment in addition to chrome vermilion, blue pigments include group stains, cobalt blue or cerulean blue, and green pigments include cobalt green, emerald green, hiridian, etc. Alternatively, they can be used in combination.

In addition, in Example 1, when the area of the green phosphor is larger than the other areas, the green filter is configured to transmit - part of the red component, but the luminous ability of red and blue pixels other than lines If it is necessary to make the area of the red or blue phosphor screen larger than the other for reasons of convenience, the same effect as in the above embodiment can be obtained even if the red and blue color filters allow some of the other color components to pass through. It has the effect of

In addition, in the above embodiment, the case where one of the three color phosphors is arranged in a fluorescent display section has a larger area than the others, or the area of each phosphor is equal to each other. The present invention can also be applied to cases where there is a difference in the light emitting ability of each phosphor and the transmittance of each color filter is adjusted corresponding to the light emitting ability of each phosphor. be effective.

In addition, in the above-mentioned embodiment, a large screen display constructed by combining a large number of CRT-type light emitting elements was explained. , 11j and green, a light emitting element consisting of a white backlight with three wavelength peaks, a liquid crystal shutter, and a color filter, or a light emitting device equipped with a color filter that glows in red, blue, and green. Even in the case of a large screen display, the same effects as in the above embodiment can be achieved.

In addition to the combination of a large number of light emitting elements, it is also possible to construct a fluorescent display section with a one-piece plate structure and configure a large number of pixels in a two-dimensional array, each pixel containing a three-color phosphor that can be excited by electron beams or ultraviolet rays and a color filter. In addition to CRTs and plasma display panels (PDPs) composed of the above-mentioned CRTs and plasma display panels (PDPs), LEDs and EL (electroluminescence) panels also exhibit the same effects as those of the shoe-wearing embodiment.

〔Effect of the invention〕

As described above, the color image display device according to the present invention has the following features:
Three types of phosphors that emit red, blue, and green light respectively and are arranged so that green light increases; red and blue ink containing red and blue pigments; and at least one of the green pigment and the red and blue pigment. Each color is made separately from green ink mixed with a predetermined ratio of green ink, and the color filter is provided to cover the light emitting surface of the phosphor corresponding to each color. A color image display device that can display colors with low color density in a high-quality manner is advantageous.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the structure of the fluorescent display section of the color image display device according to the present invention, and FIG. 2 is II-11 in FIG.
3 is a diagram showing the emission spectrum of the phosphor constituting the fluorescent display part of the device according to the present invention, and FIG. 4 is a diagram showing the spectral transmittance curve of the color filter in the device according to the present invention. Figure 5 is a chromaticity diagram of the CIE color system that expresses the color when three primary colors are mixed, Figure 6 is a diagram showing the mixing ratio of the three primary colors in monochromatic light of each wavelength, and Figure 7
The figure is a front view showing the structure of the fluorescent display section of a conventional color image display device, FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7, and FIG. 9 is a fluorescent FIG. 10 is a diagram showing a spectral transmittance curve of a color filter in a conventional device. In the figure, (5R) is a red phosphor, (5B) is a blue phosphor, (5G) is a linear light body, and (20) is a filter layer. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] Three types of phosphors that emit red, blue, and green light respectively and are arranged so that green light increases; red and blue ink containing red and blue pigments; and green pigment and at least one of the red and blue pigments. 1. A color image display device comprising color filters each made separately from green ink mixed with a predetermined proportion of green ink and provided to cover the light emitting surface of the trend body corresponding to each color.