JP2009122402A - Improved LED display - Google Patents

Abstract

【Task】
A light source substrate in which LED elements composed of the three primary colors of red (R), green (G), and blue (B) are appropriately arranged as a light source in units of one pixel. The present invention intends to solve the problems of the conventional LED display by controlling the light emission.
[Solution]
A light source substrate on which a striped light source is arranged vertically or horizontally at a predetermined interval on the surface, and a liquid crystal cell disposed on at least one side thereof, and red (R), green (G), and blue from the end surface of the striped light source (B) an LED display that receives light of the three primary colors and controls the liquid crystal cell to emit light from the outer peripheral surface of the stripe light source,
An improved LED display characterized in that the light source is fully lit and the liquid crystal cell is driven in that state to control the light emission of each pixel by passing or blocking the light from the light source.
[Selection] Figure 4

Description

The present invention relates to an improved LED (light emitting diode) display that can be used as a liquid crystal television, a liquid crystal monitor, or the like.

A conventional LED display is driven by controlling the supply of electric current to obtain a predetermined color by a single red (R), green (G), or blue (B) LED, which is usually a single bullet type. It is like that.

Therefore, if an LED panel display with fine dots is to be realized, a board on which a large number of LEDs are mounted becomes a multilayer circuit board. In addition, there is a problem that a pattern and a circuit formed on the control substrate connected to the multilayer substrate are extremely complicated.
The above-mentioned drawbacks are similarly held even when a single bullet-type LED made of red (R), green (G), and blue (B) is composed of smaller chip LEDs. It was a thing.
In addition, when a single LED is used, the size of red (R), green (G), and blue (B) 1-package minimum LEDs is limited to downsizing by about 3 mm square. Therefore, only a rough LED display having a pixel unit of about 10 mm square can be produced.

Therefore, in order to solve the above-described drawbacks in Japanese Patent Application No. 2006-325024, the present inventor used an LED element composed of three primary colors of red (R), green (G), and blue (B) as a light source in units of one pixel. The light source substrate arranged as appropriate and a liquid crystal cell disposed on at least one side thereof, the light source is fully lit, and the light emission of each pixel is controlled by the liquid crystal cell in that state, the above conventional The LED display which solved the problem was proposed.
Japanese Patent Application No. 2006-325024

However, in the invention of the Japanese Patent Application No. 2006-325024, a light source substrate in which LED elements composed of the three primary colors of red (R), green (G), and blue (B) are appropriately arranged as a light source in units of one pixel is used. Therefore, a large number of LED elements are required, and there is a problem that it is difficult to reduce costs because it takes time to connect the elements.

Accordingly, the present invention includes a light source substrate in which stripe light sources are arranged vertically or horizontally at predetermined intervals on the surface, and a liquid crystal cell disposed on at least one surface thereof, and red (R) and green colors are formed from the end surfaces of the stripe light sources. (G), an LED display that controls the liquid crystal cell by making light of three primary colors of blue (B) incident and emitting light from the outer peripheral surface of the stripe light source,
In order to propose a more improved LED display, the light source is fully lit and the light emission of each pixel is controlled by driving the liquid crystal cell in that state to pass or block the light from the light source. To do.
By doing this,
1) It is possible to cover smaller sized pixels. 2) An improved LED display with a significant effect that can achieve a significant cost reduction has been achieved.

That is, the improved LED display according to the present invention comprises a light source substrate in which striped light sources are arranged vertically or horizontally at predetermined intervals on the surface, and a liquid crystal cell disposed on at least one surface thereof, from the end surface of the striped light source. An LED display in which light of three primary colors of red (R), green (G), and blue (B) is incident, and light is emitted from the outer peripheral surface of the stripe light source, and is controlled using a liquid crystal cell,
The light source is fully lit, and the liquid crystal cell is driven in this state to control the light emission of each pixel by passing or blocking the light from the light source.

In the improved LED display according to the present invention, the light reflected by the cut light source via the stripe light source is formed by forming cuts of a predetermined angle at predetermined intervals along the length direction on the outer peripheral surface of the stripe light source. Further, the present invention is characterized by adopting a structure in which the liquid crystal cell is irradiated from the outer peripheral surface of the stripe light source.

The improved LED display according to the present invention is characterized in that the striped light source is made of an optical fiber.

The improved LED display according to the present invention is also characterized in that the striped light source comprises a linear optical waveguide.

The improved LED display according to the present invention includes a light source substrate in which stripe light sources are arranged vertically or horizontally at predetermined intervals on a surface, and a liquid crystal cell disposed on at least one surface thereof. An LED display that uses a liquid crystal cell to input light of the three primary colors of R), green (G), and blue (B) and emit light from the outer peripheral surface of the LED. In addition, since the light emission of each pixel is controlled by the liquid crystal cell in that state, the following effects can be obtained.
1: Since the liquid crystal cell is used, the LCD manufacturing infrastructure can be used, and the current control substrate can be used, so the cost of the member is very low.
2: The LED display is a striped light source that realizes the three primary colors of red (R), green (G), and blue (B) to form a light source in units of one pixel, and emits light from its outer peripheral surface, using a liquid crystal cell The LED display is controlled by a point light emitting stripe light source that makes point emission by cutting the stripe light source at a predetermined interval. Therefore, there is a size problem when using a single LED. There can be no significant downsizing.
3: Since a color filter is not used in the liquid crystal cell portion, the light transmittance is high, and the driving method is the same as when a color filter is used, and color breakup does not occur.
4: Low temperature characteristics can be ensured as compared to the case of using a single LED.
5: Since the light source is fully lit and the liquid crystal cell is driven in that state to control the light emission of each pixel by passing or blocking the light from the light source. By cutting and highlighting the light in the area where it is used, the light utilization efficiency is greatly improved.
Since expensive LED elements required for every 6: 1 pixel can be greatly reduced, a significant cost reduction can be achieved.

Hereinafter, embodiments of the LED display of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view showing a reference example of the LED display of the present invention, FIG. 2 is a perspective view showing a first embodiment of the LED display of the present invention, and FIG. 3 shows a second embodiment of the LED display of the present invention. FIG. 4 is a schematic explanatory view of a state in which a light irradiation part of an optical fiber or an optical waveguide is formed.

In the reference example of FIG. 1, reference numeral 11 denotes a light source substrate in which LED elements composed of the three primary colors of red (R), green (G), and blue (B) are appropriately arranged as a light source in units of one pixel. Reference numeral 12 denotes a liquid crystal cell disposed on at least one surface of the light source substrate 11. The light source is fully lit, and the light emission of each pixel is controlled by the liquid crystal cell 12 in this state.
At that time, if the light source is fully turned on and the light emission of each pixel is controlled by the liquid crystal cell 12 in that state, a complicated circuit and a control mechanism as in the case of current control are unnecessary. can do.
The liquid crystal cell 12 is preferably driven by active matrix driving in which a switching element and an additional capacitor are connected to each pixel of the liquid crystal cell 12 and each pixel is controlled via the switching element. That is, the liquid crystal cell 12 can be opened and closed for each pixel composed of the three primary colors of red (R), green (G), and blue (B), and a predetermined color can be obtained by controlling the opening and closing parts. It is a thing.
Of course, other driving methods may be used.

In FIG. 2, reference numeral 21 denotes a light source substrate having a synthetic resin material 22 as a base and an optical fiber as an optical waveguide 23 positioned inside. In the illustrated example, an optical fiber is used as the optical waveguide 23. For example, optical fibers are aligned in a mold with a jig or the like at a predetermined interval, and then a synthetic resin is injected into the mold and molded. By doing so, it is possible to obtain the light source substrate 21 in which the optical fibers are embedded in stripes in the light source substrate 21 at a predetermined interval.

The light guides 23 made of optical fibers disposed on the light source substrate 21 at predetermined intervals sequentially receive light of three primary colors of red (R), green (G), and blue (B) from the end surfaces on one side or both sides. Light up. Reference numeral 24 denotes a liquid crystal cell disposed on at least one surface of the light source substrate 21. The light source is turned on, and the light emission of each pixel is controlled by the liquid crystal cell 24 in this state.
If light of the three primary colors red (R), green (G), and blue (B) is incident from one side of the optical waveguide 23 made of an optical fiber, a reflection surface should be formed at the other end. Good.

The structure of the light incident part 25 is such that the light incident part 25 can be connected to the optical waveguide 23 disposed at a predetermined interval on the light source substrate 21 using an optical fiber, or by other methods. Of course, 25 may be formed.
Incidentally, in the light incident part 25, the light of the three primary colors of red (R), green (G), and blue (B) is made to enter each optical fiber or optical waveguide 23 after branching one light source. Can do.

The light incident from the light incident portion 25 is diffused from the surface of the light source substrate 21 at the outer peripheral portion of the optical waveguide 23 made of optical fibers disposed at a predetermined interval in the light source substrate 21, and red (R), The light of the three primary colors of green (G) and blue (B) is emitted in stripes.
At that time, if the stripe light source is turned on and the light emission of each pixel is controlled by the liquid crystal cell 24 in that state, a complicated circuit and a control mechanism as in the case of current control are unnecessary. It can be.

In the second embodiment of FIG. 3, reference numeral 31 denotes a light source substrate having a glass material 32 as a base and a portion whose refractive index is changed by condensing irradiation of laser light as an optical waveguide 33.
When the optical waveguide 33 is used, the outer peripheral surface of the optical waveguide may be formed in a lens shape, and the lens portions may be arranged on the surface of the light source substrate 31 at a predetermined interval.

Reference numeral 34 denotes a liquid crystal cell disposed on at least one surface of the light source substrate 31. The light guide 33 is turned on, and the light emission of each pixel is controlled by the liquid crystal cell 34 in this state.
By doing so, a complicated circuit and a mechanism for control as in the case of current control can be eliminated.

In the second and third embodiments, the size of the unit pixel also changes depending on the diameters of the optical waveguide 23 and the optical waveguide 33 made of optical fibers. The pixel size can be dramatically reduced.

4 (a) and 4 (b) show an outer peripheral portion of an optical waveguide 42 made of an optical fiber or the like constituting a striped light source in which light incident from the light incident portion 45 is disposed on the light source substrate 41 at a predetermined interval. This is to explain a specific structure for radiating from the surface of the light source substrate 41 via.
That is, the optical waveguide 42 is formed with cuts 43 of a predetermined angle at predetermined intervals along the length direction thereof, so that the light reflected by the cuts 43 is outside the optical waveguide 42 opposite to the cuts 43. Irradiation from the surface toward the liquid crystal cell 44 is performed.
The V-shaped angle of the cut 43, the depth of cut in the optical waveguide 42 made of an optical fiber constituting a stripe light source, and the like are used for the refractive index of the light of the material employed in the optical waveguide 42 and the optical fiber made of an optical fiber or the like. It can be determined appropriately according to the diameter of the waveguide 42 and the like.

The operation and effect of the LED display having the above-described configuration, and a liquid crystal television and a liquid crystal monitor to which the LED display is applied will be described.
1: Since the liquid crystal cell is used, the LCD manufacturing infrastructure can be used, and the current control substrate can be used, so the cost of the member is very low.
2: Since a light source substrate in which LED elements composed of three primary colors of red (R), green (G), and blue (B) are arranged at predetermined intervals as a light source in units of one pixel is used, a single LED is used. There is no problem in size as in the case, and a significant reduction in size can be achieved.
3: Since a color filter is not used in the liquid crystal cell portion, the light transmittance is high, and the driving method is the same as when a color filter is used, and color breakup does not occur.
4: Color reproducibility is higher than when single LED is used.
5: Low temperature characteristics can be secured as compared with the case of using a single LED.
6: Since the light source is fully lit and the liquid crystal cell is driven in that state to control the light emission of each pixel by passing or blocking the light from the light source. By cutting and concentrating the light on the used area, the light utilization efficiency is greatly improved.

Since the LED display of the present invention is configured as described above, it can be widely used not only as a substitute for a liquid crystal television or a liquid crystal monitor but also as a substitute for other liquid crystal display.

It is a top view which shows the reference example of the LED display of this invention. It is a perspective view which shows 1st Example of the LED display of this invention. It is a perspective view which shows 2nd Example of the LED display of this invention. It is a schematic explanatory drawing of the state which formed the light irradiation part of the optical fiber or the optical waveguide.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Light source substrate 12 Liquid crystal cell 21 Light source substrate 22 Glass material 23 Optical waveguide 24 Liquid crystal cell 25 Light receiving part 31 Light source substrate 32 Glass material 33 Optical waveguide 34 Liquid crystal cell 41 Light source substrate 42 Optical waveguide 43 Cut 44 Liquid crystal cell 45 Light receiving part

Claims (4)

A light source substrate on which a striped light source is arranged vertically or horizontally at a predetermined interval on the surface, and a liquid crystal cell disposed on at least one side thereof, and red (R), green (G), and blue from the end surface of the striped light source (B) an LED display that receives light of the three primary colors and controls the liquid crystal cell to emit light from the outer peripheral surface of the stripe light source,
An improved LED display characterized in that the light source is fully lit and the liquid crystal cell is driven in that state to control the light emission of each pixel by passing or blocking the light from the light source. By forming cuts of a predetermined angle at predetermined intervals along the length direction on the outer peripheral surface of the stripe light source, the light reflected by the cuts via the stripe light source is transmitted from the outer peripheral surface of the stripe light source. 2. The improved LED display according to claim 1, wherein a structure for irradiating the liquid crystal cell is adopted. 2. The improved LED display according to claim 1, wherein the striped light source comprises an optical fiber. 2. The improved LED display according to claim 1, wherein the striped light source comprises a linear optical waveguide.

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