CN1296764C - transflective liquid crystal display - Google Patents

Abstract

The invention relates to a transflective liquid crystal display, which comprises at least one transmissive pixel region and one reflective pixel region arranged in a pixel region of the transflective liquid crystal display, wherein the reflective region comprises at least one reflective electrode connected to a first pixel driving circuit (switching element), and the transmissive region comprises at least one transmissive electrode connected to a second pixel driving circuit. The LCD operates in the mode that the pixel driving circuit which operates independently controls the penetrating electrode and the reflecting electrode respectively.

Description

transflective liquid crystal display

technical field

The present invention relates to a liquid crystal display (liquid crystal display, LCD), in particular to a transflective liquid crystal display (transflective LCD).

Background technique

Liquid crystal displays have been widely used in information products such as notebook computers (notebooks), personal digital assistants (PDAs), and mobile phones. The liquid crystal display is a passive light-emitting flat-panel display, that is, the liquid crystal display requires an external light source to provide a source of light. According to different types of external light sources, liquid crystal displays (hereinafter referred to as LCDs) can generally be classified into reflective LCDs, transmissive LCDs, and transflective LCDs. Reflective LCD means that the light source enters the LCD from the front of the panel, and is reflected by an internal reflective surface (such as aluminum metal) so that the user can watch the display screen of the LCD. The transmissive LCD usually has a backlight arranged behind the liquid crystal unit to emit incident light, and the incident light selectively passes through the liquid crystal unit to display images in front of the LCD. Transflective LCD is a display that uses reflective and transmissive display screens at the same time.

Please refer to FIG. 1 . FIG. 1 is a schematic diagram of a pixel region 100 of a conventional transflective liquid crystal display, wherein the pixel region 100 can be a red pixel region, a green pixel region or a blue pixel region. As shown in FIG. 1, the pixel region 100 is composed of a reflective pixel region 110 and a transmissive pixel region 120, wherein the reflective pixel region 110 includes a reflective electrode (not shown), and the transmissive pixel region 120 includes a transmissive electrode ( not shown), and the penetrating electrodes and reflective electrodes in the same pixel area are connected to a pixel driving circuit 101 controlled by a scan line SL1 and a data line DL1, and the penetrating pixels and reflective pixels are simultaneously controlled by the pixel driving circuit 101 brightness.

Since the existing transflective liquid crystal display uses the internal backlight module as the light source in the transmissive mode, and in the reflective mode, an external light source is used to provide the light source required by the LCD in the reflective mode, but the reflective mode and the transmissive mode Therefore, if the same pixel driving circuit is used to control the transmissive pixel and the reflective pixel at the same time, the color vision can only be optimized for one of the transmissive mode and the reflective mode, but cannot Allows both modes to achieve the best color vision, thus degrading the overall perception of LCD pixel colors.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to provide a transflective liquid crystal display, which can use two independent pixel drive circuits to control the transmissive pixels and reflective pixels respectively, so that the transmissive mode and the reflective mode are optimal. Excellent color vision, the overall color vision effect can reach the best under any light source conditions.

According to the present invention, the technical solution for solving the above problems is: the transflective liquid crystal display includes a reflective area and a transmissive area arranged in a pixel area of the transflective liquid crystal display, wherein the reflective area includes A reflective electrode connected to a first pixel driving circuit, the penetrating region includes a penetrating electrode connected to a second pixel driving circuit, the first pixel driving circuit and the second pixel driving circuit respectively control the liquid crystal display reflection mode and transmission mode.

Since the reflective pixel brightness of the transflective liquid crystal display of the present invention is controlled by the first pixel driving circuit, and the brightness of the transmissive pixel is controlled by the second pixel driving circuit, the reflective mode of the transflective liquid crystal display is related to the transmission mode. The modes are under the control of the independent pixel driving circuit, which can respectively achieve the best display effect.

In order to further understand the features and technical content of the present invention, the following detailed description will be given in conjunction with the accompanying drawings. Apparently, the drawings shown and their descriptions are only exemplary and not restrictive of the present invention.

Description of drawings

FIG. 1 is a schematic diagram of a pixel area of an existing half-transmissive semi-reflective liquid crystal display;

2 is a schematic diagram of a pixel area of a half-transflective liquid crystal display according to the first embodiment of the present invention;

3 is a schematic diagram of a pixel area of a half-transflective liquid crystal display according to a second embodiment of the present invention;

4 is a schematic diagram of a pixel region of a half-transflective liquid crystal display according to a third embodiment of the present invention;

5 is a schematic diagram of a pixel area of a half-transflective liquid crystal display according to a fourth embodiment of the present invention;

6 and 7 are cross-sectional views of the semi-transmissive and semi-reflective liquid crystal display of the present invention.

Explanation of reference numbers

100, 200, 230, 300, 350 pixel area

101, 201, 202, 231, 232, 301, 302, 351, 352 pixel drive circuits

110, 210, 240, 310, 360 reflective pixel area

120, 220, 250, 320, 370 penetrating pixel area

203, 204, 205, 206, 233, 234, 235, 236, 303, 304, 305, 306, 353, 354, 355, 356 contact holes

400 LCD display

401 reflective pixel drive circuit

402 penetrating pixel drive circuit

403, 404, 405, 406 contact plug

410 reflective electrode

420 penetrating electrode

Detailed ways

Please refer to FIG. 2A . FIG. 2A is a schematic diagram of a pixel area 200 seen along the light traveling direction of the backlight of the half transflective liquid crystal display according to the first embodiment of the present invention, wherein the pixel area 200 can be a red pixel area, a green pixel area, or a blue pixel area. As shown in FIG. 2A, the pixel region 200 is composed of a reflective pixel region 210 and a transmissive pixel region 220. The brightness of the reflective pixel region 210 is controlled by the pixel driving circuit 201, and the brightness of the transmissive pixel region 220 is controlled by the pixel driving circuit 202. . The pixel driving circuits 201 and 202 share a scan line SL1 and are respectively connected to the data lines DL1 and DL2 through contact holes 203 and 204 to receive image data signals from the data lines DL1 and DL2. In addition, the pixel driving circuit 201 is connected to a reflective electrode (not shown) through a contact hole 205 for controlling the brightness of the reflective pixel region 210, and the pixel driving circuit 202 is connected to a penetrating electrode (not shown) through a contact hole 206 shown) to control the brightness of the penetrating pixel area 220. At the same time, in this embodiment, the data lines DL1 and DL2 and the pixel driving circuits 201 and 202 are disposed under the reflective pixel region 210 , so the overall aperture ratio is not affected. In addition, according to the needs of circuit design, the relative position and size ratio of the reflection pixel and the transmission pixel can be changed, as shown in FIG. 2B , FIG. 2C and FIG. 2D .

Please refer to FIG. 3. FIG. 3 is a schematic diagram of a pixel region 230 seen along the light traveling direction of the backlight of a half transflective liquid crystal display according to a second embodiment of the present invention, wherein the pixel region 230 can be a red color pixel area, a green pixel area or a blue pixel area. As shown in FIG. 3 , the pixel area 230 is composed of a reflective pixel area 240 and a penetrating pixel area 250 , the brightness of the reflective pixel area 240 is controlled by the pixel driving circuit 231 , and the brightness of the penetrating pixel area 250 is controlled by the pixel driving circuit 232 . The pixel driving circuits 231 and 232 share a scan line SL1 and are respectively connected to the data lines DL12 and DL21 through contact holes 233 and 234 to receive image data signals from the data lines DL12 and DL21. In addition, the pixel driving circuit 231 is connected to a reflective electrode (not shown) through a contact hole 235 to control the brightness of the reflective pixel region 240, and the pixel driving circuit 232 is connected to a penetrating electrode (not shown) through a contact hole 236. shown) to control the brightness of the penetrating pixel area 250. At the same time, in this embodiment, the data line DL12 and the pixel driving circuit 231 are arranged under the reflective pixel area 240, while the data line DL21 and the pixel driving circuit 232 are arranged under the reflective pixel area of the adjacent pixel area, so it will not affect the overall The size of the opening ratio.

Please refer to FIG. 4A . FIG. 4A is a schematic diagram of a pixel area 300 seen along the light traveling direction of the backlight of a half transflective liquid crystal display according to the third embodiment of the present invention, wherein the pixel area 300 can be a red pixel area, a green pixel area, or a blue pixel area. As shown in FIG. 4A, the pixel area 300 is composed of a reflective pixel area 310 and a penetrating pixel area 320. The brightness of the reflective pixel area 310 is controlled by the pixel driving circuit 301, and the brightness of the penetrating pixel area 320 is controlled by the pixel driving circuit 302. . The pixel driving circuits 301 and 302 are connected to the same data line DL1 by using the contact holes 303 and 304 . In addition, the pixel driving circuit 301 is connected to a reflective electrode (not shown) through a contact hole 305, and the scanning line SL1 transmits a signal to the reflective electrode to control the switching of the reflective pixel region 310. The pixel driving circuit 302 uses a contact hole 306 It is connected to a penetrating electrode (not shown), and the scan line SL2 transmits a signal to the penetrating electrode to control the switch of the penetrating pixel region 320 . Meanwhile, in this embodiment, the scanning lines SL1 and SL2 and the pixel driving circuits 301 and 302 are arranged under the reflective pixel region 310 , so the overall aperture ratio is not affected. In addition, according to the needs of circuit design, the relative position and size ratio of the reflective pixel and the transparent pixel can be changed, as shown in FIG. 4B , FIG. 4C and FIG. 4D .

Please refer to FIG. 5. FIG. 5 is a schematic diagram of a pixel area 350 seen along the light traveling direction of the backlight of a semi-transmissive liquid crystal display according to the fourth embodiment of the present invention, wherein the pixel area 350 can be a red pixel area, a green pixel area, or a blue pixel area. As shown in FIG. 5 , the pixel area 350 is composed of a reflective pixel area 360 and a penetrating pixel area 370 , the brightness of the reflective pixel area 360 is controlled by the pixel driving circuit 351 , and the brightness of the penetrating pixel area 370 is controlled by the pixel driving circuit 352 . Wherein the pixel driving circuits 351 and 352 are connected to the same data line DL1 by using the contact holes 353 and 354, in addition, the pixel driving circuit 351 is connected to a reflective electrode (not shown) by using a contact hole 355, and the signal is transmitted by the scanning line SL1 To the reflective electrode to control the switch of the reflective pixel area 360, the pixel driving circuit 352 uses a contact hole 356 to connect to a penetrating electrode (not shown), and the scan line SL2 transmits a signal to the penetrating electrode to control the penetrating pixel area 370 switches. At the same time, in this embodiment, the scanning line SL1 and the pixel driving circuit 351 are arranged under the reflective pixel area 360, while the scanning line SL2 and the pixel driving circuit 352 are arranged under the reflective pixel area of the adjacent pixel area, so it does not affect the overall Opening rate.

Various embodiments of the present invention may also include the following several modifications. Please refer to FIG. 6 and FIG. 7 . FIG. 6 and FIG. 7 are cross-sectional views of a transflective liquid crystal display 400 of the present invention. As shown in FIG. 6, a liquid crystal display 400 includes a reflective electrode 410, a penetrating electrode 420, a reflective pixel driving circuit 401 and a penetrating pixel driving circuit 402, wherein the reflective pixel driving circuit 401 utilizes a contact plug (Via) 403 and 405 are respectively connected to the data line and the reflective electrode 410, the penetrating pixel driving circuit 402 is connected to the data line through the contact plug 404, and the material of the reflective electrode is metal or a material with good conductivity, while the material of the penetrating electrode 420 is Doped or undoped polysilicon or amorphous silicon. In addition, the penetrating electrode 420 can be directly connected to the active layer (source/drain) of the penetrating pixel driving circuit 402 as shown in FIGS. 6A and 6B , or as shown in FIG. The active layer of the penetrating pixel driving circuit 402 is connected. In addition, as shown in FIG. 7 , the material of the penetrating electrode 420 may be indium tin oxide (ITO) or indium zinc oxide (IZO), and is connected to the penetrating pixel driving circuit 402 through a contact plug 406 , and the penetrating electrode 420 The position of the electrode 420 can be varied as shown in Figures 7A, 7B and 7C. As shown in FIG. 7A , the penetrating electrode 420 is located at the lowest layer of the penetrating pixel driving circuit 402 . As shown in FIG. 7B , the penetrating electrodes 420 are located on the same layer as the scanning lines. As shown in FIG. 7C , the penetrating electrodes 420 are located on the same layer as the data lines.

Compared with the existing way of using a single pixel driving circuit to simultaneously control the penetrating pixel and the reflective pixel, the present invention provides an independent pixel driving circuit to separately control the brightness of the penetrating pixel and the reflective pixel, so it can effectively solve the problems of the prior art. The disadvantage is that the transmissive mode and reflective mode of the transflective liquid crystal display can achieve the best display effect at the same time.

The above only describes the preferred implementation of the present invention. Obviously, all equivalent changes and modifications made according to the content disclosed in the application documents of the present invention are covered by the protection scope of the present invention.

Claims (9)

1. semitransparent and half-reflective liquid crystal display, it comprises an at least one reflector space and a penetration region in the pixel region of being located at this semitransparent and half-reflective liquid crystal display, wherein above-mentioned reflector space comprises at least one reflecting electrode that is connected to one first pixel-driving circuit, above-mentioned penetration region comprises at least one through electrode that is connected to one second pixel-driving circuit, described first pixel-driving circuit and the equal independent operation of second pixel-driving circuit are with the reflective-mode of controlling described half-penetrating half-reflecting display respectively and penetrate pattern.

2. semitransparent and half-reflective liquid crystal display as claimed in claim 1, wherein above-mentioned pixel region comprise a red pixel area, a blue pixel area or a green pixel zone.

3. semitransparent and half-reflective liquid crystal display as claimed in claim 1, the shared one scan line of wherein above-mentioned first pixel-driving circuit and second pixel-driving circuit, above-mentioned first pixel-driving circuit is connected to one first data line, to utilize this first data line to send a signal to above-mentioned reflector space and to control the brightness of this reflector space, above-mentioned second pixel-driving circuit is connected to one second data line, to utilize this second data line to send a signal to above-mentioned penetration region and to control the brightness of this penetration region.

4. semitransparent and half-reflective liquid crystal display as claimed in claim 1, the shared data line of wherein above-mentioned first pixel-driving circuit and second pixel-driving circuit, this first pixel-driving circuit is connected to one first sweep trace, to utilize first sweep trace to send a signal to above-mentioned reflector space and to control the switch of this reflector space, second pixel-driving circuit is connected to one second sweep trace, to utilize this second sweep trace to send a signal to above-mentioned penetration region and to control the switch of this penetration region.

5. semitransparent and half-reflective liquid crystal display as claimed in claim 1, wherein above-mentioned second pixel-driving circuit are located at above-mentioned reflecting electrode below, to avoid influencing the aperture opening ratio of this semitransparent and half-reflective liquid crystal display.

6. semitransparent and half-reflective liquid crystal display as claimed in claim 1, wherein above-mentioned through electrode is connected with the active layer of above-mentioned second pixel-driving circuit.

7. semitransparent and half-reflective liquid crystal display as claimed in claim 1, wherein above-mentioned through electrode is located at the orlop of above-mentioned second pixel-driving circuit.

8. semitransparent and half-reflective liquid crystal display as claimed in claim 1, wherein above-mentioned through electrode and one scan line are located at same one deck.

9. semitransparent and half-reflective liquid crystal display as claimed in claim 1, a wherein above-mentioned through electrode and a data line are located at same one deck.

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