JP4122503B2 - LED display - Google Patents

Description

The present invention relates to an 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.
Japanese Patent Laying-Open No. 2005-77691 JP 2003-86846 A JP 2002-49326 A

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 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.

In order to eliminate the above-mentioned drawbacks, the present invention uses LED elements composed of the three primary colors of red (R), green (G), and blue (B) as light sources in units of one pixel at predetermined intervals on the surface. A light source substrate that is horizontally arranged and that is fully lit, and a liquid crystal cell that is disposed at least on one side thereof, and that the light source is fully lit and the liquid crystal cell is driven in that state to turn red (R) Pixels corresponding to each LED element of red (R), green (G), and blue (B) by passing or blocking light from each LED element composed of three primary colors of green (G) and blue (B) Thus, the problem of the conventional LED display is solved.

That is, in order to solve the above-mentioned problems, the LED display according to the present invention has LED elements composed of three primary colors of red (R), green (G), and blue (B) as light sources in units of one pixel at a predetermined interval on the surface. A light source substrate that is vertically or horizontally arranged and that is fully lit, and a liquid crystal cell that is disposed at least on one side thereof, and the light source is fully lit and the liquid crystal cell is driven in that state to turn red (R), green (G), blue (B) by passing or blocking the light from each LED element consisting of the three primary colors, each red (R), green (G), blue (B) LED element The light emission of the corresponding pixel is controlled.

The LED display according to the present invention includes a light source substrate in which LED elements composed of three primary colors of red (R), green (G), and blue (B) are appropriately arranged as a light source in units of one pixel, 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, thereby producing the following effects.
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.

Hereinafter, embodiments of the LED display of the present invention will be described in detail with reference to the drawings. 1 is a plan view showing an embodiment of the LED display of the present invention, FIG. 2 is a perspective view showing a reference example of the LED display of the present invention, and FIG. 3 is a perspective view showing another reference example of the LED display of the present invention. It is.

In the embodiment of FIG. 1, reference numeral 11 denotes a light source substrate in which LED elements composed of 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 to control each pixel through the switching element. Of course, other driving methods may be used.

In the reference example of FIG. 2, reference numeral 21 denotes a light source substrate having a glass material 22 as a base and a portion where the refractive index is changed by condensing irradiation of laser light as an optical waveguide 23. In the illustrated example, the optical waveguides 23 are formed in the light source substrate 21 at predetermined intervals. However, optical fibers may be arranged on the light source substrate 21 in stripes at predetermined intervals.

The optical fibers or optical waveguides 23 arranged on the light source substrate 21 at predetermined intervals sequentially receive red (R), green (G), and blue (B) light of the three primary colors from one side or both sides, respectively. Let 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.
When light of the three primary colors red (R), green (G), and blue (B) is incident from one side of the optical fiber or optical waveguide 23, a reflecting surface may be formed at the other end. .

The structure of the light incident part 25 is such that an optical fiber is used to connect to the optical fiber or the optical waveguide 23 disposed at a predetermined interval on the light source substrate 21 with a connector or an adhesive, or otherwise. Of course, the light incident portion 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.

Light incident from the light incident part 25 is diffused from the surface of the light source substrate 21 in the optical fiber or the optical waveguide 23 portion arranged at a predetermined interval in the light source substrate 21 to be red (R), green (G ), The light of the three primary colors of 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 another reference example of FIG. 3, reference numeral 31 denotes a light source substrate in which a point light source 33 is formed by aligning the end faces of optical fibers or forming a lens portion on an optical waveguide 32.
When the optical fiber is used, the tip surface of the optical fiber is formed in a lens shape, and the tip surface is 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 point light source 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 each of the above reference examples, the size of the unit pixel also changes depending on the diameters of the optical fiber and the optical waveguides 23 and 32. By making the optical fiber and the optical waveguides 23 and 32 thinner, the size of the unit pixel jumps. Can be made smaller.

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 Example of the LED display of this invention. It is a perspective view which shows the reference example of the LED display of this invention. It is a perspective view which shows the other reference example of the LED display of this invention.

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 incident part 31 Light source substrate 32 Optical waveguide 33 Point light source 34 Liquid crystal cell

Claims (1)

LED elements consisting of the three primary colors of red (R), green (G), and blue (B) are arranged as light sources in units of one pixel vertically or horizontally on the surface at predetermined intervals, and for light sources that are fully lit A substrate and a liquid crystal cell disposed on at least one surface thereof, the light source is fully lit, and the liquid crystal cell is driven in this state to start from the three primary colors of red (R), green (G), and blue (B) The light emission of each pixel corresponding to each LED element of red (R), green (G), and blue (B) is controlled by passing or blocking light from each LED element. LED display.

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