JP3098112B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ECB for multicolor display.
(Birefringence control) type liquid crystal display device.

[0002]

2. Description of the Related Art As an ECB (birefringence control system) type multicolor display technology, a HAN (hybrid) type, STN (super twisted nematic) type, homogeneous type and the like are known. In each case, multicolor display is performed based on the principle of interference of birefringent light of liquid crystal.

[0003] Among the various liquid crystal color display systems, only the ECB system can display multicolor colors with a simple structure and relatively stably. As shown in FIG. 2, the element configuration includes a nematic liquid crystal cell 1 having a specific initial molecular arrangement and two polarizers 2 and 3. Depending on the difference in the initial molecular arrangement, a HAN type, an STN type, and a homogeneous type are used. It is classified into types. By changing the voltage applied to the liquid crystal cell 1, a multi-color display can be performed as shown in FIG.

[0004]

The above-mentioned conventional ECB type liquid crystal display device cannot display dark red, white red, light blue, or the like. That is, as shown in FIG. 3, the spectrum of a color that can be substantially displayed is determined by the applied voltage, and there is no method for darkening. The light blue is a color realized when blue and green are displayed at the same time. However, this color cannot be displayed and only becomes blue-green.

The present invention aims to realize a liquid crystal display device capable of displaying dark red, white red, light blue, and the like.

[0006]

The liquid crystal display device of the present invention is a field effect type liquid crystal display device which performs multicolor display by using birefringence of liquid crystal. Each part divided into two or more parts
The display color is changed by changing the voltage applied to the display .

In the liquid crystal display of the present invention,
A field-effect type liquid crystal display device that uses the birefringence of
In the liquid crystal display device that performs color display, dividing one pixel 16 two or more, among the parts divided into the two or more, and wherein the to Turkey and black display or white display at least one I do. By adopting this configuration, dark red and white red,
Alternatively, a liquid crystal display device capable of displaying light blue or the like is obtained.

[0008]

According to the present invention, when one pixel is divided into two, for example,
By displaying red on the one hand and black on the other, dark red can be realized. By displaying green on the one hand and blue on the other hand, light blue can be displayed. In general, the blue color of an ECB type liquid crystal display device is often dark, but by displaying some of the divided pixels in white, a bright blue can be realized.

[0009]

FIG. 1 is a diagram for explaining an embodiment of the present invention. FIG. 1A shows a conventional active matrix type E.
The figure shows one pixel of a CB type liquid crystal display device.
Is a gate bus line, 11 is a drain bus line, 12
Is a source electrode, and the source electrode 12, a gate electrode 13 connected to the gate bus line 10, and a drain electrode 14 connected to the drain bus line 11 constitute a TFT (thin film transistor 15; and the source electrode 12).
Is a rectangle having a large area and forms one pixel 16,
Liquid crystal is sealed between the electrodes.

A voltage is applied to a source electrode 12 by applying a data signal to the drain bus line 11 and a scanning signal voltage to the gate bus line 10, and a liquid crystal arrangement between the source electrode and the counter electrode is applied. Changes, the part becomes transparent, and the display color changes according to the applied voltage.

In the present invention, as shown in FIG. 1B, each pixel 16 of the above-mentioned conventional ECB type liquid crystal display device is divided into a plurality (two in the figure, 16a and 16b). Accordingly, a plurality of source electrodes 12 (two in the figure)
The TFT 15 is provided also on the divided electrode.

The operation of the embodiment constructed as described above will now be described. As shown in FIG. 1B, the pixel 1 divided into two
When the voltage V1 in FIG. 3 is applied to both of the pixels 6a and 16b, both the pixels 16a and 16b display black, so that the combined display of the pixels 16a and 16b displays black. When the voltage V2 in FIG. 3 is applied to both the pixels 16a and 16b, both the pixels 16a and 16b display white, and the display obtained by combining the pixels 16a and 16b displays white. When the voltage V5 in FIG. 3 is applied to both the pixels 16a and 16b, both the pixels 16a and 16b display red, and
The display obtained by combining the two pixels 16a and 16b is a red display.

The voltage V1 in FIG. 3 is applied to one pixel 16a to perform black display, and the other pixel 16b
By applying the voltage V2 in FIG. 3 to the white display, the display of both pixels 16a and 16b can be combined to perform gray display. In this case, both pixels 16
By alternately switching the voltages V1 and V2 applied to the pixels 16a and 16b for each frame, the pixels 16a and 16b alternately display white and black, and the color mixture becomes good.

The voltage V1 shown in FIG. 3 is applied to one pixel 16a to perform black display, and the other pixel 16b
By applying the voltage V5 in FIG. 3 to display red, the display of both pixels 16a and 16b can be combined to display dark red. Also, one pixel 16a
Is applied with the voltage V2 in FIG. 3 to perform white display,
By applying the voltage V5 in FIG. 3 to the other electrode 16b to perform red display, it is possible to combine the displays of both pixels 16a and 16b to display whitish red.

In addition to the display colors described above, one of the pixels is grayed by applying a voltage between V1 and V2 in FIG. 3 between white and black, that is, by applying a voltage between V1 and V2 in FIG. Can be used. In the above embodiment, the case where the pixel is divided into two in the active matrix type panel has been described. However, it is needless to say that the present invention can be applied to the simple matrix type. Fine color display becomes possible.

[0016]

According to the present invention, it is possible to realize an ECB type liquid crystal display device capable of performing multicolor display (16 colors or more) or gradation display by dividing a pixel into a plurality of pixels. Become.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining an embodiment of the present invention;
FIG. 2 is a diagram illustrating one pixel of a conventional liquid crystal display device, and FIG. 2B is a diagram illustrating one pixel of the present embodiment.

FIG. 2 is a diagram showing a device configuration of a conventional ECB type liquid crystal color display system.

FIG. 3 is a diagram showing a relationship between an applied voltage and a display color of an ECB type liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Gate bus line 11 ... Drain bus line 12 ... Source electrode 13 ... Gate electrode 14 ... Drain electrode 15 ... TFT 16 ... Pixel 16a, 16b ... Divided pixel

Continuation of the front page (72) Inventor Hideaki Tsuda 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (56) References JP-A-4-121710 (JP, A) JP-A-63-282717 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G02F 1/137 G02F 1/1343

Claims (2)

(57) [Claims] 1. A field effect type liquid crystal display device which performs multi-color display by using birefringence of liquid crystal, wherein one pixel (16) is divided into two or more and divided into two or more.
Display color by making the applied voltage to each part different
A liquid crystal display device characterized by differentiating . 2. A liquid crystal display device of the field effect type, comprising :
In a liquid crystal display device that performs multicolor display using refraction, one pixel (16) is divided into two or more, and divided into two or more.
Among the moieties, it said the to Turkey and black display or white display at least one liquid crystal display device.