JPS59208592A - Color display - 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 [Technical Field] The present invention relates to the structure of a color display device using a liquid crystal display.

[Prior art]

Examples of color display devices using liquid crystal displays Figures 5 and 6
This will be explained using figures. Although the driving method and components specific to liquid crystals or depending on the type will be described below in detail, the present invention applies the switching characteristics of light due to electric fields or currents.
-Explain in a film form.

In FIG. 5, (a) is a cross-sectional configuration diagram of a color display device, (b)
) represents the front view. Reference numeral 1 denotes a light source that includes the entire visible light range and is hereinafter referred to as natural light. 2 represents an optical path or light.

Reference numeral 5 denotes a liquid crystal display body having matrix electrodes holding liquid crystal therebetween, which opens and closes the light 2 to form an image. 5a indicates the visible range of the image.

A simplified example of the electrode structure of the matrix structure of the liquid crystal display 5, a matrix drive method, and a color display method will be described with reference to FIG. In the figure, numerals 4 and 5 are signal electrodes and scanning electrodes that are placed opposite each other to sandwich the liquid crystal. Scanning electrode 5a
, 5b, and 5c are given sequentially or a slack scanning signal like a television. The signal electrode 4 is provided with a luminance signal whose time width is controlled by luminance in synchronization with the scanning signal cycle. The signal electrodes 4 (7) 4a, 4b, 4c are, for example, red, green, 1v
The signal electrodes correspond to the five color filters. 6 represents a color pixel. The pixel 6 has signal polarities 4a and 4b.

A wide variety of colors and gradations from white to black can be expressed depending on the brightness ratio of 4C. 6.7 is a foot f signal generator, and wires 9a, 9b, and 9c send a signal to the scanning pole 5. is giving. 8 represents the clock of the number of televisions corresponding to the vertical and water X+L signal. 10
In the I'i color number city pole drive circuit, a shift register receives a signal 11 including a luminance signal and a clock associated with clock 8, and a launch circuit simultaneously modulates the luminance into a time width, and then outputs a signal 12a for each color. , , 12b, and 12c emit 2Vc to give a luminance signal to the signal electrode.

In this way, the liquid crystal display 5 shown in FIG.
Color display is achieved by coloring the transmitted light using a color-separated method.

An example of the matrix of a conventional color display device shown in Figure 6 shows pixel 6 as 9 pixels (5 x 5), but in reality, width x height =
(250-500) x (200-500) tens of thousands to hundreds of thousands of pixels are required.

If the matrix is divided into four colors, a matrix three times as large as this would be required, making it difficult to lead out the scanning electrodes and signal electrodes and connect them to an external circuit.

Comparing the number of external lead-out terminals in the case of monochrome and color display using the example shown in Figure 6 with the same screen size, monochrome - 5 + 5 =
b terminal, color = 5 + 5 x 5 = 12 terminals, so the difference is twice.

Historically, in order to display in color, five color filters were sequentially used, making it difficult to match them with corresponding electrodes. In addition, the capacity of other electrode drive circuits is several times that of a single color, making them expensive.

The color display device according to the present invention is intended to eliminate some of the defects of the conventional color display device using liquid crystal as described above.

〔the purpose〕

An object of the present invention is to provide an inexpensive, thin color display device using a liquid crystal display device that displays color with a single color pixel count. Another object of the present invention is to provide a color display device that can provide screen quality image quality in which the minimum manufacturable unit is a color pixel.

〔Example〕

A color display device according to the present invention will be explained below in FIG.

A block diagram of an embodiment of a color display device according to the present invention will be explained with reference to FIG. In the figure, 1 and 2 represent the same light intensity and light as in Figure 5. 15 is a color discrimination means having a liquid crystal as a component;
In the golden order, 2a is red, 2b is green, and 2c is blue. Reference numeral 16 denotes a liquid crystal display in which a large number of pixels are arranged in a matrix as shown in FIG. If an image is formed on the liquid crystal display 16 with an image brightness matched to the color of the color discrimination means 15 and repeated at a time faster than the color discrimination time of the eye, an acid color image will be obtained in which the image will be generated at the same time. .

171-j composite video signal. 18 is a circuit for separating the video signal 17 into synchronizing signals and color;
a is a vertical synchronization signal, 17b is a red, 17C is a green, and 17d is a blue luminance signal. The vertical synchronization signal 7a triggers the shift register 19 and sequentially outputs it to one of the outputs 19a, 19b, and 19c. Reference numeral 20 represents six analog switch switches 20a, 205-b, and 20c in different colors.

The color discrimination means 15 is controlled by outputs 19a, 19b, and 19c to sequentially transmit five colors each time the vertical synchronizing signal 17 arrives. The switch 20 operates, and the color luminance signal matching these transmitted colors passes through the OR circuit 21 and reaches the analog-to-digital converter 25. 22 is a sampling clock of the weather conditioner 25. The output 25a of the exchanger 25 is sent to the liquid crystal display 16 via the memory circuit 25 or directly.
gives a brightness signal to 24 and 26 are memory circuits 25
, which is necessary for the liquid crystal display 16, represents a longitudinal direction. The reason why the memory circuit 25 is used is that when the video signal 17 is based on broadcast radio waves, there is a considerable vertical and horizontal blanking time, so the memory N path is read out and the time axis is iffed to display the entire time and brighten the screen. It is. Alternatively, it is also a means for storing one screen and displaying a still image.

Note that although the video signal 17 is analog, if it is digital, a digital compatible circuit is used.

6 - Figure 2 shows the time relationship of Figure 1. a is the vertical in-phase r+ b* Cs d is the vertical synchronization signal a-iJX
Each time it arrives, the display time will be different for each of the five colors. Therefore, the cycle for full color display is 2 0 H2 in the previous example, and 20
Colors may shift in moving images of H2 or higher.

FIG. 5 shows an example of the configuration of the color discrimination means 150 using the shielding crystal shown in FIG. Reference numeral 30 denotes a transparent common electrode, which is indicated by a dashed-dotted line frame. Reference numeral 50a denotes an extended portion of the common electrode 50, which is dropped onto the substrate on the opposite electrode side and connected to an external circuit through a terminal 51.

Reference numerals 52a, 52b, and 52c represent electrodes and external connection terminals corresponding to five color filters that sandwich the liquid crystal in opposition to the common electrode 50.

When outputs 19 of the shift register are applied to these electrodes 52a, 52b, and 52c, the color discrimination means 15 sequentially transmits light of five colors. In this way, the color discrimination means 15
Since it is composed of rL, it is characterized by being inexpensive and easy to manufacture.

Next, the uniformity of transmitted light of the color discrimination means 15 will be described with reference to FIG. In FIG. 4, the same numbers as in FIG. 3 have the same meanings as π. 551"l is a transparent substrate having an electrode 52,
55a is a transparent substrate having a common electrode 50. 54 seals the liquid crystal 55 with a spacer. When one of the electrodes 52 is selected, element 2 is transmitted in N colors, and 56a, 56
The liquid crystal display 16 is irradiated with the same color in a spread manner as shown in b and 56c. Although FIG. 4 shows an example in which the same color is transmitted from five points, in reality, several tens to hundreds of points transmit the same color, so that uniformity in luminance can be ensured. Therefore, the liquid crystal display 16 can form a good color image.

Although the explanation is delayed, in the kick electrode arrangement example shown in Fig. 5, the reason why the electrodes 52b are arranged in a zigzag pattern is that it is easy to lead out the electrodes to the outside on the same plane board, and according to experiments, the blue This is because it is difficult to obtain a luminance of 1, so making it in a zigzag shape matches the need to make the transmission area larger than that of other colors.

Similarly, in order to ensure the uniformity of the transmitted light as shown in FIG.

Furthermore, although the light source 1, the color discrimination means 15, and the liquid crystal display 16 are shown separated from each other in the figure, it is also possible to arrange them in close contact using, for example, an electroluminescence plane marshall. The display device is characterized by being thin with a thickness of about 10 mm.

To give an additional explanation to the town, when the video signal is a single color, if the signal is applied to the color electrodes 52a, 52b, and 52C of the color discriminator 15 at the same time, all colors will pass through, so natural light will pass through, resulting in a clear image. It is a heat theory that a monochromatic image can be obtained.

〔effect〕

As described above, according to the present invention, by separating the color discriminating means, which also has a liquid crystal as a component from the liquid crystal display of the image forming section, it is easy to manufacture, inexpensive, thin, and a product quality image can be obtained. Obtaining a functional display device will greatly contribute to the thinning of heavy-duty products such as color televisions.

　9　-

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of a color display device according to the present invention. FIG. 2 is a diagram showing the time relationship in FIG. 1. FIG. 5 is a diagram showing an example of the arrangement of color-specific electrodes of color discrimination means, which is a component of the color display device according to the present invention. FIG. 4 is a diagram illustrating the uniformity of brightness of the color discrimination means. Fifth
The figure is a diagram showing the external appearance of a color display device that uses a conventional liquid crystal as a component. FIG. 6 is a diagram showing a configuration block diagram of a scanning electrode driving circuit and a signal electrode driving circuit of matrix electrodes that control the liquid crystal shown in FIG. 1. 1... Light source 15... Color discrimination means 1
6...Liquid crystal display 19...Shift register 25 that generates a color switching signal
. . . Manaro-digital converter 25 . . . Memory type 1 path 56 . . . Indicates the original spread and shows that the light illuminates the liquid crystal display 16 in a uniform brightness. - 1 0 - N A (1) ”'Cs Figure 3 (a) (b) Figure 5 Figure 6

Claims (1)

[Claims] A light source means that generates light near natural light, holding a liquid crystal in between 3
A color discrimination means having five control electrodes corresponding to color filters and coloring and transmitting the light from the light source means each independently in time sequence or simultaneously; and a color discrimination means which is driven by a matrix to control the amount of transmitted light to produce an image. 1. A color display device comprising: a liquid crystal display to be formed; and a control means for synchronously controlling said color discrimination means and said liquid crystal display.