JPH0225835A - Color matrix display device - Google Patents

Abstract

PURPOSE:To simplify a signal circuit by independently turning on and off respective R, G and B composing one picture element and setting plural brightnesses and tones with the hourly combinations. CONSTITUTION:The title display is composed of a display part 3 in which a TFT 1 and a liquid crystal 2 are laminated, a scanning circuit 4 to generate a scanning voltage Vg, a signal circuit 5 to generate a signal voltage Vd, a line memory 6 to store data for a drain, a latch circuit 7, a display color generating circuit 8 to prepare the data of a color display and a control circuit 9 to control the whole device. The signal circuit 5 generates one of voltages to make the liquid crystal 2 into an on- or off-condition, simultaneously, timings to make the on-condition and off-condition are independently controlled for respective colors of R, G and B, and plural display colors are obtained. Thus, the signal circuit can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color display using a liquid crystal active matrix display, and particularly to a liquid crystal display device suitable for simplifying signal circuits.

[Conventional technology]

A conventional liquid crystal color display device has a configuration shown in FIG.

The display section includes a transistor 82 and a liquid crystal light valve 84.
Each liquid crystal light bulb has an R
, G, or B color filters are stacked.

Transistor 82 is turned on by a scanning signal applied to X conductor 8o. As a result, the video signal generated by scanning circuit 52 is written to liquid crystal light valve 84.

In order to display color in this device, it is necessary to control the R, G, and B light intensities by changing the amplitude of the level of the video signal applied to the liquid crystal light valve 84 in an analog manner.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, the signal voltage level is varied in an analog manner for each of RGB using the signal circuit, so the signal circuit becomes complicated. For this reason.

It becomes difficult to miniaturize the circuit, and there are also problems such as yield.

An object of the present invention is to provide color display with multiple brightness levels and one tone without complicating the signal circuit.

[Means to solve the problem]

The above object is achieved by independently turning on and off each of R, G, and B constituting one pixel, and setting a plurality of brightnesses and color tones through this temporal combination.

[Effect]

The signal circuit generates a voltage that turns the liquid crystal on or off, and independently controls the timing of turning the liquid crystal on or off for each color to obtain a plurality of display colors. As a result, the signal circuit can be simplified compared to conventional means that required analog changes.

〔Example〕

An eleventh embodiment of the present invention will be described below. The device includes a display section 3 in which TFTI and liquid crystal 2 are laminated,
A scanning circuit 4 that generates a scanning voltage Vg, a signal circuit 5 that generates a signal voltage V-, a line memory 6 that stores drain data, a latch circuit 7, a display color generation circuit 8 that generates color display data, and a device. It is composed of a control circuit 9 that controls the entire system.

Color display is performed by laminating the liquid crystal 2 and R, G, and B filters. Hereinafter, one embodiment of the present invention will be described in detail. FIG. 3 shows the display operation of the display unit 3. The signal voltage Vm has an amplitude ±
V s t t.

At this time, when the scanning voltage vs is at Hi level.

TPT is turned on and signal voltage v4 is applied to liquid crystal 2.

Further, when vI is at a low level, TPT is in an off state. As a result, the voltage applied to the liquid crystal becomes as shown by the dotted line, and the effective voltage of this voltage determines the brightness of the pixel.

In the present invention, this signal voltage v4 is set to Vc (display off state).
Or, either vc±V□ (display on state),
It displays in color.

Figures 4 to 6 show timing charts of drive voltages v, , - when displaying "red" with different brightness,
These are R and G that make up one pixel.

The scanning voltage v1 and applied to each TPT of B.

The signal voltage v4 and the on/off state of each color at that time are shown in time units (frame units).

In FIG. 4, an on voltage is applied to the R TPT, and an off voltage is applied to the G and B TPTs. As a result, the R pixel is turned on, and the G and B pixels are turned off. Therefore, the display color of the pixel is red.

FIG. 5 shows a voltage waveform when displaying a brighter red than that in FIG. 4. One cycle consists of six frames, and a signal voltage similar to that shown in FIG. 4 is applied to the R TPT. Further, an off voltage is applied to the G and B TFTs in the first four frames, and an on voltage is applied in the latter two frames. With this, the pixel display is the first four frames of one cycle.
The gnome is displayed in red, and in the latter half, white is displayed when all the royal colors of R, G, and H are turned on. By repeating this cycle, a brighter red (pink) than in FIG. 4 is displayed.

FIG. 6 is an application of FIG. 5, and one cycle consists of four frames. The first two frames are displayed in red,
The latter two frames are displayed in white.

By repeating this cycle, a brighter red can be displayed than in the display method shown in FIG.

As shown above, it is possible to set a plurality of brightnesses by changing the number of frames in one cycle and the temporal ratio of the number of red and white frames.

Note that this display method allows you to set the brightness of all colors, not just red.

FIG. 7 shows an embodiment of a display method in which color tone is set by similar temporal switching of signal voltages. this is,
In the first two frames of one cycle consisting of four frames, the amplitude of the signal voltage applied to R is ±vsl, and the signal voltage applied to G and B is O to display R, and in the latter two frames, the same is applied. to display G. Each time this is repeated, an intermediate color of yellow can be displayed. In addition, by changing the combination of colors and the number of frames in which the colors are displayed, it is possible to display not only cyan marienta but also intermediate colors.

The above display method may be one in which the same color is displayed in multiple frames (two or more frames) as shown in FIG.

Figure 7 shows 1 which generates the signal voltage data as described above.
An example of the display color generation circuit 8 is shown. The signal voltage data is
Turn on switches 10 to 17.

By turning it off, one of two levels, on voltage and off voltage, is selected and output. In other words, switch 10~
17 in terms of time.

Figures 10 to 12 show color filters7.
R, G, B surrounded by dotted lines (Figure 12 shows R, G, B,
The color display method according to the present invention in which one pixel is composed of W (white) can be applied to any color filter. In addition to these, display is also possible with pixels composed of two colors, such as R and G, G and B, or R and B.

In the embodiment, only a display device using a liquid crystal and a color filter as a display device and a TPT as a switch element has been described.

As a display device used in this device.

There are non-emissive types and emissive types. Non-emissive types include liquid crystal and ECr)
There are combinations of color filters, etc., and light-emitting types include LED, EL, light emitting display tube, and plasma.

Moreover, as a switch element, an a-SiTFT is used.

It is also possible to use three-terminal elements such as p-SiTFT, two-terminal elements such as MIM, etc.

Applications of the color matrix display device according to the present invention include word processors, personal computers, navigation system displays that display location and information when installed in automobiles, fish finders, bank terminals, etc. By using color, information can be transmitted. becomes smoother and more information can be displayed.

〔Effect of the invention〕

According to the present invention, since the signal circuit can be simplified, the circuit can be made smaller and lower in price, and yields can be improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a color matrix display device according to an embodiment of the present invention, FIG. 2 is a diagram showing a conventional example, FIG. 3 is a driving voltage waveform diagram, and FIGS. 4 to 8 are voltage diagrams according to the present invention. FIG. 9 is a waveform diagram, FIG. 9 is a display color generation circuit diagram, and FIGS. 10 to 12 are diagrams showing color filters. DESCRIPTION OF SYMBOLS 1...TFT, 2...Liquid crystal, 3...Display section, 4...Scanning circuit, 5...Signal circuit, 8...Display color generation circuit, 9...Control circuit.

Claims (1)

[Claims] 1. An optical switch and a color filter are stacked to form one display dot, the display dots are arranged in a matrix to form a display panel, and a color image is displayed on the display panel. The color matrix display is characterized in that a plurality of the display dots are combined to form one pixel, and a color image is displayed by changing the intensity of transmitted light over time for each of the display dots forming the pixel. Color matrix display device. 2. One display dot is constructed by laminating an optical switch and a color filter, and the other display dot is constructed by an optical switch and an achromatic filter or only an optical switch, and the one display dot and the other display In a color matrix display that configures a display panel by arranging dots in a matrix and displays a color image on the display panel, a plurality of one display dots and at least one other display dot are combined. A color matrix display device comprising one pixel and displaying a color image by temporally changing transmitted light intensity in units of the display dots forming the pixel. 3. In the color matrix display device according to claim 1 or 2, the optical switch is formed by laminating an a-Si thin film transistor, a p-Si thin film transistor, or a two-terminal non-linear element and a liquid crystal. A color matrix display device characterized by: 4. In the color matrix display device according to claim 1 or 2, the filter has one of red, green, blue, two colors, or three colors.
A color matrix display device characterized by a combination of colors.