TWI451175B - System for displaying images - Google Patents

Description

Image display system

The present invention relates to a flat panel display (FPD) technology, and more particularly to a pixel structure of a liquid crystal display device.

In recent years, with the advancement of electronic product development technology and its increasingly widespread applications, such as mobile phones, personal digital assistants (PDAs) and notebook computers, etc., it has a smaller size than conventional displays. The demand for flat panel displays (FPDs) for power consumption characteristics is increasing day by day, making it one of the most important electronic applications. The above flat display device comprises: a liquid crystal display (LCD) device, an organic light-emitting display (OLED) device, a microelectromechanical (MEMS) display device, an electrophoretic display (EPD) device, and the like. Among flat panel displays, liquid crystal display devices are non self-emissive type display devices and require an additional backlight module or front light module to provide the light source needed to display the image.

In recent years, due to the rise of environmental awareness, reducing the power consumption of liquid crystal display devices has become an important issue in response to the promotion of energy saving and carbon reduction. However, the color filter used in the liquid crystal display device reduces the transmittance of the entire display device, and thus it is difficult to achieve energy saving by reducing the brightness of the backlight or the front light module.

In order to solve the above problems, a four-dimensional pixel unit (usually including red, green, blue, and white) structure technology has been developed, in which a white sub-pixel unit uses a colorless filter to relatively enhance the liquid crystal display device. The overall transmittance can be compared to the brightness of a lower backlight or front light module compared to a typical three-primary color pixel structure.

However, in the four-dimensional pixel unit structure, since the area of each main color sub-pixel unit is smaller than the area of each main-color pixel unit of the three-primary sub-pixel unit structure, the solid color display operation is lowered. The brightness of the time. Furthermore, the presence of white sub-pixel elements creates a problem of simultaneous contrast due to human eye structure. Therefore, when the brightness of the solid color display operation is lowered by the four-dimensional pixel structure, the problem of the simultaneous contrast becomes more serious. In this regard, it has been further proposed to reduce the area of the white sub-pixel unit in the four-pixel unit structure to alleviate the problem of simultaneous contrast and at the same time improve the brightness in the solid color display operation.

However, changing the area of the white sub-pixel unit requires changing the original linear configuration of the gate line and/or the data line to a curved configuration design, resulting in an increase in wiring difficulty and causing resistance of the gate line and/or the data line. Increased causes problems such as gate delay and/or data distortion.

Therefore, it is necessary to find a new liquid crystal display device structure which can solve or ameliorate the above problems.

In view of this, an embodiment of the present invention provides an image display system. The system includes a liquid crystal display device, including: a first substrate and a second substrate disposed opposite thereto, wherein the first substrate has a plurality of pixel units, and each pixel unit includes at least one pixel unit to display a main The color and the sub-pixel unit have a first display area and a second display area; a color filter and a colorless filter are disposed between the first substrate and the second substrate, and respectively correspond to the first a display area and a second display area; the first and second transistors are disposed on the first substrate, and are respectively configured to control the first display area and the second display area; and a liquid crystal layer disposed on the first substrate and the first substrate Between the two substrates.

The making and using of the embodiments of the present invention are described below. However, the present invention is to be understood as being limited to the details of the present invention.

The image display system of the embodiment of the present invention will be described below. Please refer to FIGS. 1 and 2, which illustrate an image display system, in particular, an image display system having a liquid crystal display device 100, wherein FIG. 1 depicts a picture in a liquid crystal display device 100. A schematic diagram of a unit cell array structure, and FIG. 2 is a schematic cross-sectional view of a sub-pixel unit 201 of each pixel unit 100a in FIG. In the present embodiment, the liquid crystal display device 100 includes a plurality of pixel units 100a arranged in an array, and each pixel unit 100a includes one or more sub-pixel units 201. Each pixel unit 201 is used to display a dominant color, such as red, green or blue. To simplify the description, FIG. 2 only shows the single-primary pixel unit 201 as shown.

In this embodiment, each sub-pixel unit 201 of the liquid crystal display device 100 includes: a first substrate 200 (eg, an array substrate), and a second substrate 210 disposed opposite to the first substrate 200 to be disposed on The liquid crystal layer 206 between the first and second substrates 200 and 210. In an embodiment, the first substrate 200 and the second substrate 210 may be transparent substrates such as glass, quartz, or other transparent materials. Generally, the first substrate 200 includes a plurality of gate lines (scan lines) and a data line formed thereon (not shown) for defining a plurality of sub-pixel units 201. In one embodiment, each pixel unit 201 can be defined by a pair of gate lines 103 and a data line 101 (as shown in FIG. 3A). In another embodiment, each pixel unit 201 can be defined by a pair of data lines 101 and a gate line 103 (as shown in FIG. 3B). In this embodiment, in particular, each pixel unit 201 is further divided into a first display area 201a and a second display area 201b.

A first transistor 202a and a second transistor 202b, such as a thin film transistor (TFT), are disposed on the first substrate 200 of each pixel unit 201, and serve as switching elements for respectively controlling The first display area 201a and the second display area 202b.

A first pixel electrode 204a and a second pixel electrode 204b are respectively disposed on the first substrate 200 in the first display area 201a and the second display area 201b, wherein the first pixel electrode 204a is inserted through a conductive layer The via plug 203a is electrically connected to a source/drain of the first transistor 202a, and the second pixel electrode 204b is electrically connected to a source of the second transistor 202b via a conductive via plug 203b. Extreme / bungee. In one embodiment, the first pixel electrode 204a and the second pixel electrode 204b may be indium tin oxide (ITO) or indium zinc oxide formed by conventional deposition techniques. , IZO).

The liquid crystal layer 206 disposed between the first substrate 200 and the second substrate 210 is located above the first pixel electrode 204a and the second pixel electrode 204b. Furthermore, a common electrode 207 is disposed above the liquid crystal layer 206, which may be composed of indium tin oxide (ITO) or indium zinc oxide (IZO). In this way, the liquid crystals in the liquid crystal layer 206 corresponding to the first display region 201a and the second display region 201b can be respectively controlled by applying different voltages to the source or the drain of the first transistor 202a and the second transistor 202b. Molecules (not shown).

In this embodiment, in particular, a color filter 208a (for example, a red, green or blue photoresist) and a colorless filter 208b (for example, a colorless photoresist) are disposed on the first substrate 200 and The second substrate 210 is between the first display area 201a and the second display area 201b. The color filter 208a and the colorless filter 208b may be separated from each other by a black photoresist layer 208c (for example, a black matrix (BM)). For example, a portion of the black photoresist layer 208c may be disposed over a boundary between the first display region 201a and the second display region 201b. In other embodiments, the color filter 208a may be a complementary color of a dominant color such as red, green, or blue to form a sub-pixel unit that displays a complementary color. In each pixel unit 201, the colorless filter 208b serves as a white display area for providing brightness assistance. That is, the colorless filter 208b functions similarly to the white sub-pixel elements in the conventional four-dimensional pixel unit (usually including red, green, blue, and white) structural techniques.

As described above, the white sub-pixel unit in the conventional four-dimensional pixel unit structure has a problem of simultaneous contrast and a problem of brightness reduction in a solid color display operation. In the present embodiment, in order to improve the above problem, the area of the color filter 208a is different from the area of the colorless filter 208b. For example, the color filter 208a has a larger area than the colorless filter 208b. In this way, the problem of simultaneity contrast can be alleviated by reducing the area of the white area (i.e., the area of the colorless filter 208b) that provides brightness (or transmittance) assistance. On the other hand, since the total area of the colorless filter 208b in the liquid crystal display device 100 is smaller than the area of the color filter 208a, the brightness at the time of the solid color display operation can be improved.

It should be noted that although the color filter 208a, the colorless filter 208b, and the black photoresist layer 208c in this embodiment are located between the second substrate 210 and the liquid crystal layer 206, in other embodiments, the color filter The 208a, the colorless filter 208b, and the black photoresist layer 208c may also be located between the first substrate 200 and the liquid crystal layer 206.

Referring to FIG. 3A, a schematic plan view of a sub-pixel unit 201 according to an embodiment of the present invention is illustrated, wherein the same reference numerals are used for components that are the same as those of FIGS. 1 and 2, and the description thereof is omitted. In this embodiment, the sub-pixel unit 201 may include a pair of gate lines 103 and a data line 101, wherein the first transistor 202a and the second transistor 202b are electrically connected to the corresponding sub-pixel area 201, respectively. Different gate lines 103 and an identical data line 101 are included.

Furthermore, the first display area 201a and the second display area 201b have a rectangular top view profile, and the color filter 208a and the colorless filter 208b corresponding to the first display area 201a and the second display area 201b have similarities to The upper side of the first display area 201a and the second display area 201b is a contour. Here, in order to simplify the drawing, the black photoresist layer 208c is not shown. In one embodiment, the areas of the color filter 208a and the colorless filter 208b may be larger than the areas of the first pixel electrode 204a and the second pixel electrode 204b, respectively. In another embodiment, the areas of the color filter 208a and the colorless filter 208b may be substantially the same as the areas of the first pixel electrode 204a and the second pixel electrode 204b, respectively. However, it should be noted that the first pixel electrode 204a does not extend directly below the colorless filter 208b, and the area of the second pixel electrode 204b does not extend directly below the color filter 208a.

In an embodiment, the top view profiles of the color filter 208a and the colorless filter 208b may be identical to the top view profiles of the first pixel electrode 204a and the second pixel electrode 204b, respectively. In another embodiment, the top view profiles of the color filter 208a and the colorless filter 208b may be different from the top view profiles of the first pixel electrode 204a and the second pixel electrode 204b, respectively.

Referring to FIG. 3B, a plan view of a sub-pixel unit 201 according to another embodiment of the present invention is illustrated, wherein components identical to those of FIG. 3A are given the same reference numerals and their description is omitted. Different from the embodiment shown in FIG. 3A, the sub-pixel unit 201 may include a pair of data lines 101 and a gate line 103, wherein the first transistor 202a and the second transistor 202b are electrically connected to the corresponding The different data lines 101 and the same gate line 103 in the sub-pixel area 201.

Referring to FIG. 3C, a plan view of a sub-pixel unit 201 according to still another embodiment of the present invention is illustrated, wherein components identical to those of FIG. 3A are given the same reference numerals and their description is omitted. Different from the embodiment shown in FIG. 3A or FIG. 3B, the first pixel electrode 204a and the second pixel electrode 204b of the embodiment adopt a multi-domain vertical alignment (MVA) wide viewing angle technology. The pattern design of the pixel electrodes is such that the upper color profiles of the color filter 208a and the colorless filter 208b corresponding to the first pixel electrode 204a and the second pixel electrode 204b are similar to the first pixel electrodes 204a and the second. The top view profile of the pixel electrode 204b.

According to the above embodiment, since the size of the white area for providing brightness assistance can be easily adjusted by changing the area ratio of the color filter 208a and the colorless filter 208b, the gate line and/or the data line are not changed. Straight line configuration design. That is, according to the above embodiment, in addition to reducing the simultaneity contrast and improving the lack of brightness in the solid color display operation, problems such as gate delay and/or data distortion can be eliminated.

4 is a block diagram showing an image display system according to another embodiment of the present invention, which can be implemented in a flat panel display (FPD) 300 or an electronic device 500, such as a notebook computer or a mobile phone. , a digital camera, a personal digital assistant (PDA), a desktop computer, a television, a car display, or a portable DVD player. The flat panel display 300 may have the liquid crystal display device 100 previously described, and the flat panel display 300 may be a liquid crystal display panel. As shown in Fig. 4, the flat panel display 300 includes a liquid crystal display device as shown in the liquid crystal display device 100 of Figs. 1 and 2. In other embodiments, electronic device 500 can have a flat display 300. As shown in FIG. 4, the electronic device 500 includes a flat display 300 and an input unit 400. Furthermore, the input unit 400 is coupled to the flat panel display 300 for providing an input signal (eg, an image signal) to the flat panel display 300 to generate an image.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can be modified and retouched without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Liquid crystal display device

100a‧‧‧ pixel unit

101‧‧‧Information line

103‧‧‧ gate line

200‧‧‧First substrate

201‧‧‧ pixel units

201a‧‧‧First display area

201b‧‧‧Second display area

202a‧‧‧First transistor

202b‧‧‧second transistor

203a, 203b‧‧‧ Conductive interlayer plug

204a‧‧‧first pixel electrode

204b‧‧‧second pixel electrode

206‧‧‧Liquid layer

207‧‧‧Common electrode

208a‧‧‧Color filters

208b‧‧‧Colorless filter

208c‧‧‧black photoresist layer

210‧‧‧second substrate

300‧‧‧ flat panel display

400‧‧‧ input unit

500‧‧‧Electronic devices

1 is a plan view showing a structure of a pixel unit array in a liquid crystal display device according to an embodiment of the present invention; and FIG. 2 is a schematic cross-sectional view showing a pixel unit of each pixel unit in FIG. .

3A through 3C are schematic plan views showing the structure of a sub-pixel in accordance with various embodiments of the present invention.

Figure 4 is a block diagram showing an image display system in accordance with another embodiment of the present invention.

200. . . First substrate

201. . . Secondary pixel unit

201a. . . First display area

201b. . . Second display area

202a. . . First transistor

202b. . . Second transistor

203a, 203b. . . Conductive interlayer plug

204a. . . First pixel electrode

204b. . . Second pixel electrode

206. . . Liquid crystal layer

207. . . Common electrode

208a. . . Color filter

208b. . . Colorless filter

208c. . . Black photoresist layer

210. . . Second substrate

Claims (11)

An image display system comprising: a liquid crystal display device comprising: a first substrate and a second substrate disposed opposite thereto, wherein the first substrate has a plurality of pixel units, each pixel unit includes at least one of three times a pixel unit for displaying a three main color, and the sub-pixel units are arranged in the same direction, at least one of the sub-pixel units having a first display area and a second display area; a color filter And a colorless filter disposed between the first substrate and the second substrate, and corresponding to the first display area and the second display area respectively; a first transistor and a second transistor are disposed On the first substrate, and respectively for controlling the first display area and the second display area; and a liquid crystal layer disposed between the first substrate and the second substrate. The image display system of claim 1, wherein the liquid crystal display device further comprises a first pixel electrode and a second pixel electrode, respectively disposed in the first display area and the second display area. The first substrate is electrically connected to the first transistor and the second transistor, respectively. The image display system of claim 2, wherein the color filter and the colorless filter have an area not less than an area of the first pixel electrode and the second pixel electrode, respectively. The image display system of claim 1, wherein the color filter has an area larger than an area of the colorless filter. The image display system of claim 1, wherein the color filter and the colorless filter are located between the second substrate and the liquid crystal layer. The image display system of claim 1, wherein the color filter and the colorless filter are located between the first substrate and the liquid crystal layer. The image display system of claim 1, wherein the sub-pixel unit comprises a pair of gate lines and a data line, and the first transistor and the second transistor are electrically connected to the pair The gate line is electrically connected to the data line. The image display system of claim 1, wherein the sub-pixel unit comprises a pair of data lines and a gate line, and the first transistor and the second transistor are electrically connected to the pair The data line is electrically connected to the gate line. The image display system of claim 1, further comprising: a flat panel display comprising the liquid crystal display device; and an input unit coupled to the flat panel display for providing an input to the flat panel display The flat panel display displays an image. The image display system of claim 9, wherein the system comprises an electronic device having the flat panel display. The image display system of claim 10, wherein the electronic device comprises a notebook computer, a mobile phone, a digital camera, a number of assistants, a desktop computer, a television, a vehicle display, Or a portable DVD player.