JPS61145596A - Display unit - 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 the Invention The present invention relates to a display device that is effective for displaying text and graphic information from information equipment such as computers and video signals from video equipment.

2. Description of the Related Art In recent years, there has been an increasing demand for lightweight, inexpensive display devices capable of color display in the field of information equipment, mainly computers, and the field of video equipment, mainly televisions, VTRs, and the like. As this type of display device, a display device capable of color display using the electro-optic effect of liquid crystal, which can easily be made thinner, is being put into practical use.

The conventional display device described above will be described below with reference to the drawings. FIG. 3 is a sectional view showing a schematic configuration of a conventional display device. In FIG. 3, 3o is a glass substrate,
Reference numeral 31 denotes polarizing plates 32L and 32b attached to one surface of the glass substrate 30.

Nutribe-shaped color fill layers 320 are red, green, and blue, respectively, and transparent electrodes 33 in the X direction are formed on the lower glass substrate. Reference numeral 34 denotes a transparent electrode in the Y direction, which is formed on the upper glass substrate. 36 is a liquid crystal layer.

FIG. 4 shows the structure of the electrodes of the conventional display device shown in FIG.
8 is an electrode in the X direction, 402L, 40b, 40C, 4
1a +41 b, 41 C,...-...43
b, 430 is an electrode in the Y direction, which is the color fill 32a in FIG.

32b and 320, respectively.

The operation of the conventional display device configured as described above will be described below. The liquid crystal layer 36 is made of TN liquid crystal, and the polarized light passing through the liquid crystal layer in the part where no voltage is applied is 9
It rotates 0 degrees and is blocked by the other polarizing plate. The polarized light that passes through the liquid crystal layer in the portion where the voltage is applied is not rotated and therefore passes through the polarizing plate. Now, select the electrode 45 in the X direction, and set the voltage of the red information among the Y direction information corresponding to the X coordinate of the electrodes 40 & , 41 & , 42 & , 4
3&, green information voltage to electrodes 4ob, 41b, 4
2b.

43b, the blue information voltage is applied to the electrode 400.41C.

By applying voltage to 42C and 43C, one line of information corresponding to the above-mentioned X coordinate can be displayed.

By sequentially selecting the electrodes in the X direction as 46, 47, . . . and repeating the same operation, the entire information can be displayed. (For example, Technical Report of the Television Society of Japan, December 22, 1986, "Multi-color display using liquid crystal.") Problems to be solved by the invention However, in the above configuration, one picture element constitutes However, three Y-direction electrodes are required: red, green, and blue. Therefore, the number of electrodes in the Y direction is required to be three times that of a monochrome display device having a similar configuration. Therefore, there was a problem in that it became difficult to process and mount the lead wires from the electrodes. Furthermore, it is necessary to form fine-pitch color fills in precise alignment with the electrodes, which becomes difficult to manufacture as the pitch of the electrodes becomes finer. Furthermore, the above two problems become more noticeable as the display capacity increases and the number of electrodes increases.

Therefore, the present invention reduces the number of electrodes to 173 compared to conventional color display devices, facilitates mounting of lead lines, and eliminates the need for fine-pitch color fitting, which reduces manufacturing costs. can also be significantly reduced.

Means for Solving the ProblemsThe technical means of the present invention for solving the above problems is as follows:
A light source that can electrically switch between the three primary colors of red, green, and blue is provided, and in synchronization with the timing of switching between the three primary colors, a selection voltage for displaying information of the corresponding color is applied to each of the optical shutters. The configuration is such that the voltage is applied to the electrodes in a time-division manner.

action The effect of this technical means is as follows.

That is, in the present invention, the information of the corresponding color is displayed in synchronization with the switching timing of the light source that is installed on the back side of the matrix-like optical shutter and can electrically switch between the three primary colors of red, green, and blue. The selected voltage is applied to each electrode of the optical shutter in a time division manner, and three colors can be displayed with one electrode without requiring separate electrodes for each color of red, green, and blue. Therefore, the number of electrodes can be reduced to ⅓. Furthermore, the fine-pitch color fills of red, green, and blue that were provided for each electrode are no longer necessary.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a display device according to an embodiment of the present invention. In FIG. 1, 1 is an electrode in the Y direction of a matrix-shaped optical shutter, 2 is an electrode in the X direction of the optical shutter, and 3 is a voltage scanning circuit that scans the electrode 2 in the X direction and applies a scanning voltage. , 7, 8.9 are memories for storing red, green, and blue display data, respectively; 4, 5.
Reference numeral 6 denotes a selection voltage generation circuit 1o that outputs a selection voltage according to one row of display data corresponding to the selected electrode in the X direction among red, green, and blue display data.

11.12 was installed on the back of the optical shutter,
Red optical shutter that switches between the three primary colors from a white light source;
Electrodes corresponding to each color of green and blue; 13 is a counter electrode to the electrodes corresponding to each color; 14 is an electrode 10. ．． 11,12.1
15 a drive voltage generation circuit that generates the drive voltage necessary for 3;
16 is a light source switching circuit that switches the red, green, and blue electrodes to transmit each color, and 16 is a selection voltage for each color that is applied to the Y-direction electrodes of the matrix optical shutter in synchronization with the light source switching circuit. RGB selection circuit for switching, 17
is a control circuit that controls a voltage scanning circuit 3, a light source switching circuit 15, an RGB selection circuit 16, a memory, etc.
18 is an interface circuit for inputting display data and the like from an external device.

FIG. 2 is a schematic perspective view showing the configuration of a display device according to an embodiment of the present invention. In Fig. 2, 1°2 is the transparent electrode in the Y direction and the X direction of the matrix optical shutter, and 2
o is a glass substrate, 21 is a polarizing plate, 22 is a liquid crystal layer, 10,
11.12 is an electrode corresponding to red, green, and blue of an optical shutter for switching the three primary colors from a white light source; 13 is a counter electrode thereof; 23 is a glass substrate; 24 is a liquid crystal layer; 26 is a polarizing plate; is a white light source, and 27.28.29 is a red, green, and blue color fill.

The operation of the display device of this embodiment configured as described above will be described below. The matrix optical shutter and the optical shutter for switching the three primary colors of the light source are both TN liquid crystal panels sealed with TN liquid crystal. It is configured to transmit polarized light of each color incident from the source.

First, display data is input from an external device through the interface circuit 18, and stored in the memos IJ-7, IJ-8, and IJ-9 for each color of red, green, and blue. On the other hand, the control circuit 17 controls the voltage scanning circuit 3 to scan the electrodes of the matrix optical shutter in the X direction, and simultaneously reads out one row of data corresponding to the electrodes in the X direction from the memory. The read data is input to the selection voltage generation circuits 4, 5.6 for each color, and the selection voltage generation circuits 4, 5.6 output selection voltages corresponding to the display data. The light source switching circuit 15 and the RGB selection circuit 16 are controlled synchronously by the same control signal. For example, when the light source is red, the RGB selection circuit 16 selects a selection voltage corresponding to red display data, and Apply voltage to the electrode in the direction. Color display can be performed by switching this for each of the three colors.

By configuring as described above, it is possible to realize a display device capable of color display with the same configuration as a monochrome display panel.

In addition, in the example, a liquid crystal panel in which a TN liquid crystal was sealed in the optical shutter was used, but the present invention is not limited to this.
It goes without saying that it is also possible to use a liquid crystal panel using liquid crystal in other operating modes, and an optical shutter using a substance exhibiting an electro-optic effect other than liquid crystal.

Although a color filter and an optical shutter are used when switching the three primary colors from the light source, the invention is not limited to this, and each color may be switched by directly controlling the three light sources that emit the three primary colors.Furthermore, It goes without saying that the light source also includes natural light such as the sun.

Effects of the Invention The present invention has the following advantages: M) Display data for each of the three primary colors of red, green, and blue to be output to the IJ-shaped optical shutter at the switching timing of each color of red, green, and blue illuminated from the back side. Since it is configured to output in synchronization, it is possible to display color using a matrix-shaped optical shutter with the same configuration as a black-and-white display device. Therefore, the electrodes of the matrix-shaped optical shutter The effect is that the number can be reduced to 1/3. Furthermore, it also eliminates the need for fine-pitch color fill, leading to a reduction in manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a display device according to an embodiment of the present invention, FIG. 2 is a schematic perspective view showing the configuration of a display device according to an embodiment of the present invention, and FIG. 3 is a conventional display. FIG. 4 is a schematic perspective view showing the structure of the device, and FIG. 4 is a plan view showing the structure of the electrodes of the conventional display device. 2.33... Electrode in the X direction, 1,34...
...Y-direction electrode, 3...Voltage scanning circuit, 4.
5.6...Selection voltage generation circuit, 10.11.1
2...Electrode for switching three primary colors, 13...
・Counter electrode, 16...Light source switching circuit, 16
...RGB selection circuit, 17 ... control circuit, 26 ... light source, 27 , 28 , 29 ...
...color fill, 32L, 32b, 320
・・・・・・Striped color filter.

Claims (4)

[Claims] (1) It has a structure in which a plurality of electrodes arranged in the X direction and a plurality of electrodes arranged in the Y direction are arranged in a matrix with a predetermined gap maintained so as to face each other, and the above-mentioned X
By inserting a substance whose optical properties change depending on an electric field between the electrodes in the X direction and the Y direction, and applying a predetermined selection voltage to each electrode in the X direction and Y direction, the selection voltage is applied. a matrix-like optical shutter configured such that the optical transmittance at the intersection of each electrode in the X direction and the Y direction is greater than the optical transmittance at a portion to which the selection voltage is not applied; The light source is configured to display information by transmitting or blocking light from a light source provided on the back side of the screen, and the light source is provided with means for electrically switching between the three primary colors of red, blue, and green to switch between the three primary colors. Select voltage to display corresponding color information in synchronization with timing,
A display device characterized in that the voltage is applied to each electrode of the optical shutter in a time-division manner. (2) The display device according to claim (1), wherein the matrix optical shutter is an optical shutter that utilizes the electro-optic effect of liquid crystal. (3) The means for electrically switching the three primary colors of red, blue, and green is provided between a white light source and a matrix-shaped optical shutter.
At least one set of optical filters consisting of three primary colors of red, blue, and green and a second optical shutter configured to transmit each color independently are provided, and electrodes corresponding to each color of the second optical shutter are provided. The display device according to claim 1, wherein the display device is configured to switch between the three primary colors of red, blue, and green by applying a predetermined selection voltage to the display device. (4) The display device according to claim (3), wherein the second optical shutter is an optical shutter that utilizes the electro-optic effect of liquid crystal.