CN100420999C - pixel unit - Google Patents

Abstract

A pixel unit of a display panel comprises three sub-pixels, wherein each sub-pixel can be divided into a first light penetration area and a second light penetration area, a first transistor and a first photoresist layer are arranged in the first light penetration area, and a second transistor and a second photoresist layer are arranged in the second light penetration area. The first photoresist layer and the second photoresist layer are formed on a filter plate and have different thicknesses or areas. The data signals received by the first transistor and the second transistor have a functional relation, and each sub-pixel can generate new gray-scale brightness and increase the number of displayable colors by matching the two data signals with the two photoresist layers with different thicknesses or areas.

Description

pixel unit

technical field

The invention relates to a pixel unit and its control system, in particular to a pixel unit capable of improving color saturation and brightness.

Background technique

The liquid crystal panel mainly includes a substrate, a color filter plate and a liquid crystal layer between them. There are multiple thin film transistors in an array type and a control circuit on the substrate, which are mainly used to control the display of patterns or characters. The color filter plate mainly provides red, blue, and green color matching. However, since the liquid crystal panel itself does not emit light, an external surface light source is required to provide uniform, high brightness, and wide viewing angle display effects. Generally, according to the type of display, the surface light source can be divided into backlight module and front light module. The backlight module is located behind the LCD panel and is mainly used for transmissive displays. The front light module is located in front of the LCD panel and is mainly used for reflective and semi-reflective displays. Reflective display.

Regardless of whether it is a reflective or transmissive LCD, when the absorptivity of the color filter plate is too large or the color density increases, the transmittance will be greatly reduced. Therefore, the brightness of the display is greatly limited, and this limitation must be considered when designing a high-brightness display.

Please refer to FIG. 1A , which shows a configuration of pixel units of a conventional liquid crystal panel. The traditional liquid crystal panel 10 has a lower substrate 11 and an upper substrate 12, and includes a plurality of pixel units (pixel) 13, and each pixel unit 13 only includes a red sub-pixel (sub-pixel) 131, a green sub-pixel 132 and a blue sub-pixel 133 . Each sub-pixel is a three-dimensional structure, taking the red sub-pixel 131 as an example, its structure includes a photoresist layer 121 formed on the lower surface of the upper substrate 12, a thin film transistor 111 and a pixel electrode 112 located on the lower substrate 11 and the liquid crystal layer 14 between the photoresist layer 121 and the pixel electrode 112 .

Recently, in order to increase the brightness of the liquid crystal panel 10 , sub-pixels of other colors, such as white sub-pixels, are added in each pixel unit 13 . Since the backlight (not shown) of the liquid crystal panel 10 is usually white light, only a transparent area is added on the upper substrate 12 so that each pixel unit includes four sub-pixels of red, green, blue and white. The specific method is shown in FIG. 1B-FIG. 1C. A transparent photoresist layer 124 is combined with red, green and blue photoresist layers 121, 122, 123 to improve the brightness of the pixel unit. Figure 1B is a stripe configuration; Figure 1C is a mosaic configuration.

Assuming that the transmittance of the material itself is 100%, but since the photoresist layers 121 , 122 , 123 themselves contain colors, they can only allow light waves of this color to pass through. For one of the three primary color sub-pixels 131 , 132 , 133 , only one of the three color lights can pass through, leaving only one-third of the brightness. Taking a pixel unit 13 containing three primary color sub-pixels 131, 132, 133 as an example, the light transmission area of each sub-pixel 131, 132, 133 accounts for one-third of the light transmission area of the pixel unit 13, so the total area of a pixel unit 13 The amount of light transmitted is 3×1/3×1/3=1/3. After the transparent photoresist layer 124 is added to the upper substrate 12, a pixel unit 13 contains four sub-pixels, and the light transmission area of each sub-pixel accounts for a quarter of the light transmission area of the pixel unit 11. If the transparent photoresist If the light transmittance of the agent layer 124 is 100%, the total light transmittance of the pixel unit is 3×1/3×1/4+1×1/4=1/2>1/3. In this way, the pixel configuration on the upper substrate 12 is changed, and the three primary color photoresist layers 121, 122, 123 (RGB) are changed into three primary color photoresist layers 121, 122, 123 plus a transparent photoresist Layer 124 (RGB+W). Utilizing the transparent region 124 increases the amount of light transmission, such that all colors are brightened. Even so, adding white light to mix colors makes the picture whiter, and also causes the color saturation to drop.

It can be seen from the above description that the brightness of the liquid crystal display is limited by the light transmittance of the photoresist layer. To increase the amount of light transmitted, it is necessary to add white sub-pixels to change the configuration of pixels. However, the known technology cannot effectively control the light transmission amount of the white sub-pixel, so that the color saturation of the three primary color sub-pixels is affected after increasing the light transmission amount of this part. The invention changes the pixel structure of the display, and at the same time cooperates with circuit control to improve the color saturation and brightness of the display.

Contents of the invention

The object of the present invention is to provide a pixel unit, which can perform light compensation for the inherent red, green and blue sub-pixels, and provide a control system to calculate the best combination of control signals, and input each sub-pixel of the pixel unit to produce the best color mixing effect.

The pixel unit of the display panel of the present invention includes three sub-pixels, and each sub-pixel can be divided into a first light-transmitting region and a second light-transmitting region, and a first light-transmitting region is provided in the first light-transmitting region. Transistor and a first photoresist layer, a second transistor and a second photoresist layer are arranged in the second light penetration area. The first photoresist layer and the second photoresist layer are formed on a filter plate and have different thicknesses or areas. The data signals received by the first transistor and the second transistor have a functional relationship, and each sub-pixel can generate a new gray scale by matching the two data signals with the two photoresist layers with different thicknesses or areas. Brightness and increase the number of colors that can be displayed.

In order to provide appropriate data signals to the first transistor and the second transistor, the present invention also provides a control system for signal control of the pixel unit. The control system mainly includes a de-multiplexer and a multiplexer. After receiving a control signal, the anti-multiplexer performs a function operation on the control signal to separate a first signal, and then outputs the control signal and the first signal to the multiplexer. After receiving the control signal and the first signal output by the anti-multiplexer, the multiplexer performs an algorithm on the control signal to convert it into a second signal, and then outputs the first signal to the first transistor, and the second signal output to the second transistor.

The pixel unit structure composed of the first light penetrating area and the second light penetrating area, coupled with the circuit control mechanism of the control system, increases the brightness and color saturation of the flat-panel display.

Description of drawings

FIG. 1A is a configuration method of pixel units of a known liquid crystal panel;

FIG. 1B is a known bar configuration of pixel units;

FIG. 1C is a mosaic-like arrangement of known pixel units;

FIG. 2A is a liquid crystal panel with a pixel structure of the present invention;

FIG. 2B is the position and control area of the thin film transistor of the pixel unit;

Fig. 3A-Fig. 3B are the filter plate structures of different thickness photoresist layers;

4A-4C are the coverage area size and arrangement state of the photoresist layer in the pixel unit;

Fig. 5A-Fig. 5E are the filter plate structure of different color blocking;

Fig. 6A-Fig. 6B are the structure of the filter plate arranged in different colors; and

FIG. 7 is a control system of the liquid crystal panel of the present invention.

Symbol Description:

10 LCD panel (known) 22 pixel unit

11 Substrate 30a Filter plate

110 thin film transistor array 30b filter plate

111 thin film transistor 30c filter plate

111r thin film transistor 31 transparent photoresist layer

111R thin film transistor 32 transparent photoresist layer

112 pixel electrode 33 transparent photoresist layer

12 upper substrate 40a pixel unit

121 red photoresist layer 40b pixel unit

122 green photoresist layer 40c pixel unit

123 blue photoresist layer 40d pixel unit

124 transparent photoresist layer 40e pixel unit

13 pixel unit 41 transparent photoresist layer

131 red sub-pixel 42 transparent photoresist layer

132 green sub-pixel 43 transparent photoresist layer

133 blue sub-pixels 50a pixel unit

14 Liquid crystal layer 50b pixel unit

20 Liquid crystal panel (the present invention) 51 Transparent photoresist layer

21 Filter plate 60 Control system

211 first photoresist layer 61 control signal

211r thin red photoresist layer 62 anti-multiplexer

211g Thin Green Photoresist Layer 63 Multiplexers

211b thin blue photoresist layer

212 second photoresist layer

212R red photoresist layer

212G green photoresist layer

212B blue photoresist layer

Detailed ways

The pixel unit of the present invention and its control system are described in detail in conjunction with the diagrams, and the preferred embodiments are listed as follows:

Please refer to FIG. 2A , which is a liquid crystal panel having a pixel structure of the present invention. The liquid crystal panel 20 has a substrate 11 , a liquid crystal layer 14 and a filter plate 21 . The substrate 11 has a thin film transistor array 110 including a plurality of thin film transistors 111 and a plurality of pixel electrodes 112 . The lower surface of the filter plate 21 has at least a first photoresist layer 211 and a second photoresist layer 212, and the light transmittance of the first photoresist layer 211 is greater than that of the second photoresist A preferred embodiment of the resist layer 212 is to make the first photoresist layer 211 thinner than the second photoresist layer 212 . In the figure, the first photoresist layer 211 is a thin red photoresist layer 211r, a thin green photoresist layer 211g or a thin blue photoresist layer 211b, and the second photoresist layer The photoresist layer 212 is a thicker red photoresist layer 212R, a green photoresist layer 212G or a blue photoresist layer 212B. The thin film transistor array 110 , the filter plate 21 and the liquid crystal layer 14 in the middle together form a plurality of pixel units 22 .

Please refer to FIG. 2B, the sub-pixel of the pixel unit 22 includes at least two thin film transistors 111R, 111r, which are respectively arranged in a first light-transmitting region 11a and a second light-transmitting region 11b adjacent to each other on the substrate 11, wherein The first light penetrating area 11a is used for light compensation. The filter plate 21 is located above the TFT array 110 , and covers the first light-transmitting region 11 a with a first photoresist layer 211 , and covers the second light-transmitting region 11 b with a second photoresist layer 212 . FIG. 2A shows that in a preferred embodiment, the pixel unit 22 includes six light-transmitting regions (not labeled) arranged in two columns and three rows. Relative to the configuration position of the light penetrating region, the thin red photoresist layer 211r, red photoresist layer 212R, thin green photoresist layer 211g, and green photoresist layer of the filter plate 21 212G, the thin blue photoresist layer 211g and the blue photoresist layer 212B are also arranged in two columns and three rows to form a staggered arrangement of photoresist layers with different thicknesses.

3A-3B show a structure in which photoresist layers with different thicknesses are arranged on the filter plate 21 . The six photoresist layers in FIG. 3A correspond to the six light-transmitting regions of the same pixel unit. The red photoresist layer 212R, the green photoresist layer 212G and the blue photoresist layer 212B are arranged in the first row, and are all thick photoresist layers. The thin red photoresist layer 211r, the thin green photoresist layer 211g, and the thin blue photoresist layer 211g are arranged in the second column so that the thickness of the photoresist layer of the sub-pixel in the second column of the pixel unit is less than The thickness of the photoresist layer for the first column of subpixels. FIG. 3B is a case where the red photoresist layer 212R, the green photoresist layer 212G and the blue photoresist layer 212B are arranged in different columns. Therefore, when the positions of the red photoresist layer 212R and the thin red photoresist layer 211r in the same row in FIG. 3A are reversed, the green photoresist layer 212G and the thin green photoresist layer 211g When the positions of the blue photoresist layer 212B and the thin blue photoresist layer 211b are swapped, the formed pixel unit structure does not depart from the scope of the present invention.

Please refer to FIG. 4A-FIG. 4C, which are the coverage area size and arrangement state of the photoresist layer in the pixel unit. In Fig. 4A, the filter plate 30a includes six photoresist layers, and the three thin transparent photoresist layers 31, 32, 33 in the upper column cover an area larger than the red photoresist layer in the lower column. 212R, a green photoresist layer 212G, and a blue photoresist layer 212B. In Fig. 4B, the covering areas of the three thin transparent photoresist layers 31, 32, 33 in the upper column of the filter plate 30b are equal to the red photoresist layer 212R and the green photoresist layer 212G in the lower column. and blue photoresist layer 212B. In Fig. 4C, the coverage areas of the three thin transparent photoresist layers 31, 32, 33 in the upper row of the filter plate 30c are smaller than the red photoresist layer 212R and the green photoresist layer 212G in the lower row. and blue photoresist layer 212B. In Fig. 4A-Fig. 4C, the coverage area relationship of the photoresist layers of any row can be exchanged mutually, for example, the thin transparent photoresist layer 31 of Fig. 4A and the red photoresist layer 212R are positioned mutually. Change.

The above-mentioned first photoresist layer 211 may be a monochrome photoresist layer or a transparent photoresist layer. For example, a transparent, red, green, blue or other colored photoresist layer. The color combination and sequence of the first photoresist layer 211 of the three sub-pixels are also not limited, for example: red-green-blue, red-blue-green, white-white-blue or other combinations are all visible Depends on need.

Please refer to FIG. 5A-FIG. 5D, the first photoresist layer 211 may also be a combined structure of a partially colored photoresist layer or a partially transparent photoresist layer. Please refer to FIG. 5A-FIG. 5C and FIG. 5D, the filter plates 40a, 40c, and 40d all include a transparent photoresist layer 41 surrounding the thin red photoresist layer 211r, and are connected with the thin red photoresist layer 211r together cover the first light penetrating region 11a. In FIG. 5A, the coverage area of the transparent photoresist layer 41 is smaller than the coverage area of the thin red photoresist layer 211r. In FIG. 5C, the coverage area of the transparent photoresist layer 41 is larger than the coverage area of the thin red photoresist layer 211r. In addition, the brightness of the second light-transmitting area 11b of the red, green, and blue sub-pixels is respectively passed through the transparent photoresist layers 41, 42 and 43 in the first light-transmitting area 11a, or the colored photoresist layers The thickness or area of the agent layers 211r, 211g and 211b can be adjusted. FIG. 5D is to increase the grayscale brightness of blue in the pixel unit alone and deepen the saturation of blue. Therefore, there is only a green photoresist layer 212G and a thin blue photoresist layer 211b on the filter 40d. , and then use the transparent photoresist layer 42 to increase the brightness.

Referring to FIGS. 6A-6B , the first photoresist layer 211 and the second photoresist layer may be colored photoresist layers of different colors. In FIG. 6A, the filter plate 50a is a thin blue photoresist layer 211b matched with a red photoresist layer 212R. 6B shows that the coverage area of the thin blue photoresist layer 211b, the thin green photoresist layer 211g or the thin red photoresist layer 211r in the first light-transmitting region 11a is about the same as that of the transparent photoresist layer. The coverage area of the resist layer 51 is equal. In this way, when the pixel unit displays a single color, it can provide higher brightness than the conventional pixel unit configuration while maintaining color saturation.

In conjunction with the concepts of photoresist layers of different thicknesses in FIGS. 3A-3B and the area distribution patterns of FIGS. 5A-5D and FIG. The transparent photoresist layer and the colored photoresist layer with different areas are composed, and both cover the first light-transmitting region 11a together. In a preferred embodiment, the color photoresist layer is thinner than the transparent photoresist layer to take into account both brightness and color compensation, and the second photoresist layer 212 is a thicker monochrome photoresist. etchant layer. In order to take into account the color saturation, the total covered area of the second photoresist layer 212 is preferably larger than that of the first photoresist layer 211 . The structure of the present invention is designed for the human eye's sense of color, which can make the human eye think that the brightness of the display is improved, and the gray scale brightness can be divided into finer, increasing the color types that can be displayed. It is applied to a penetrating LCD panel can show its effect better.

Please refer to FIG. 7 , which shows the control system of the liquid crystal panel of the present invention. Taking FIG. 2B as an example, the data signal input to the first transistor 111R and the data signal input to the second transistor 111r have a functional relationship, such as a mapping function, and a control system 60 executes the operation. The control system 60 mainly includes a de-multiplexer 62 (de-multiplexer) and a multiplexer 63 (multiplexer). After receiving a control signal 61 , the anti-multiplexer 62 performs a function operation on the control signal 61 to separate a first signal, and then outputs the control signal 61 and the first signal to the multiplexer 63 . Referring to Fig. 2B simultaneously, after the multiplexer 63 receives the control signal 61 and the first signal that the anti-multiplexer 62 outputs, an algorithm is carried out to the control signal 61 to be converted into a second signal, and then the first signal is output to the second signal A thin film transistor 111r in the light-transmitting region 11a, and the second signal is output to the thin-film transistor 111R in the second light-transmitting region 11b. The red light region PR, green light region PG and blue light region PB in FIG. The light passes through the region 11a.

In terms of circuit control, the input control signal 61 includes three sub-signals R, G, B. First, the sub-signals R, G, and B are separated by the anti-multiplexer 62, and then three mapping functions (mapping functions) are used to perform functional operations and then expanded into the sub-signal R and its corresponding first signal WR, and the sub-signal G and its corresponding first signal. A signal WG, a sub-signal B and its corresponding first signal WB. The independent sub-signals R, G, and B are then subjected to an algorithm through the multiplexer 63 to be converted into the second signals R", G", and B", and the second signals R", G", and B" are respectively sent to the red The red light area PR of the sub-pixel, the green light area PG of the green sub-pixel and the blue light area PB of the blue sub-pixel, and the first signals WR, WG, and WB are respectively sent to the red light compensation area AR and the green light compensation area AG with blue light compensation zone ab.

The function of the mapping function of the inverse multiplexer 62 is to calculate the three first signals WR, WG, WB, so that the first light-transmitting area of the three sub-pixels can be matched with the second light-transmitting area to produce the best color effect, It can increase color saturation or brightness.

In the control system 60, the second signal R″, G″, B″ generates signals according to the first signal WR, WG, WB and sub-signals R, G, B, and the first signal WR, WG, WB is determined according to The sub-signals R, G, and B are determined by the mapping function of the anti-multiplexer 62. The first light-transmitting region and the second light-transmitting region are controlled by different thin film transistors. The anti-multiplexer 62 also includes A switching unit 64 is used to select whether to carry out mapping function operation on the control signal 61 to separate the first signal WR, WG, WB. The first signal WR, WG, WB can be the voltage of forcibly closing or opening the first light penetrating region signal or current signal.

Compared with the known technology, the pixel unit and control system provided by the present invention have the following characteristics and advantages:

1. The present invention proposes a pixel unit structure composed of six light-transmitting areas of three sub-pixels, coupled with an IC circuit control mechanism, so that the brightness of the liquid crystal panel increases and the color saturation increases.

2. In the pixel unit of the present invention, all sub-pixels have two light-transmitting regions. The function of the first light penetrating area is to increase the luminous flux of the pixel unit, so that the overall brightness of the liquid crystal panel is increased, and the color saturation is enhanced.

3. Correct the color difference caused by the traditional transparent (W), red (R), green (G), and blue (B) color matching to improve color accuracy and saturation.

4. For users in different environments, the modulation mechanism can be used to force all the first light penetration areas to be closed, which is suitable for the screen brightness performance during document processing, and all the first light of the monochromatic sub-pixels are forced to pass through When the transparent area is opened, the brightness of the LCD panel can be increased, and the color saturation can be increased, which is suitable for games or drawing.

The above detailed description is a specific description of the preferred embodiments of the present invention, but the above embodiments are not intended to limit the patent scope of the present invention, and any equivalent implementation or change that does not depart from the technical spirit of the present invention shall be included in claims in this case.

Claims (15)

1. the pixel cell of a display panel comprises:

Three sub-pixels, wherein at least one sub-pixel are divided into one first smooth penetrating region and one second smooth penetrating region, are provided with a first transistor within this first smooth penetrating region, are provided with a transistor seconds within this second smooth penetrating region; And

One filter is positioned on these three sub-pixels, has one first photoresist layer corresponding to this first smooth penetrating region, and one second photoresist layer is corresponding to this second smooth penetrating region, and this first photoresist layer is thinner than this second photoresist layer,

The data-signal of wherein importing this first transistor has a funtcional relationship with the data-signal of importing this transistor seconds, by the arrange in pairs or groups photoresist layer of this two different-thickness of this two data-signal, make each sub-pixel produce new GTG brightness and increase displayable number of color.

2. pixel cell as claimed in claim 1, wherein this first photoresist layer is to comprise that a transparent photic resist layer surrounds a colored photic resist layer and covers this first smooth penetrating region jointly.

3. pixel cell as claimed in claim 2, wherein the area of this transparent photic resist layer is greater than the area of the photic resist layer of this colour.

4. pixel cell as claimed in claim 2, wherein the area of this transparent photic resist layer is less than the area of the photic resist layer of this colour.

5. pixel cell as claimed in claim 1, wherein this first photoresist layer is made up of a transparent photic resist layer and a colored photic resist layer, and both cover this first smooth penetrating region jointly.

6. pixel cell as claimed in claim 1, wherein the area of this first photoresist layer equals the area of this second photoresist layer.

7. pixel cell as claimed in claim 1, wherein the area of this first photoresist layer is greater than the area of this second photoresist layer.

8. pixel cell as claimed in claim 1, wherein the area of this first photoresist layer is less than the area of this second photoresist layer.

9. pixel cell as claimed in claim 1, wherein the color of this first photoresist layer is different from the color of this second photoresist layer.

10. pixel cell as claimed in claim 1, wherein the color of this first photoresist layer is same as the color of this second photoresist layer.

11. the pixel cell of a display panel comprises:

Three sub-pixels, wherein at least one sub-pixel are divided into one first smooth penetrating region and one second smooth penetrating region, are provided with a first transistor within this first smooth penetrating region, are provided with a transistor seconds within this second smooth penetrating region; And

One filter, be positioned on these three sub-pixels, have a transparent photic resist layer corresponding to this first smooth penetrating region, and a colored photic resist layer be corresponding to this second smooth penetrating region, the area of this transparent photic resist layer is not equal to the area of the photic resist layer of this colour

The data-signal of wherein importing this first transistor has a funtcional relationship with the data-signal of importing this transistor seconds, arrange in pairs or groups this neither with the photoresist layer of area by this two data-signal, make the new GTG brightness of each sub-pixel generation and increase displayable number of color.

12. pixel cell as claimed in claim 11, wherein this transparent photic resist layer surrounds another colored photic resist layer within this first smooth penetrating region.

13. pixel cell as claimed in claim 12, wherein the area of this transparent photic resist layer is greater than the area of the colored photic resist layer within this first smooth penetrating region.

14. pixel cell as claimed in claim 12, wherein the area of this transparent photic resist layer is less than the area of the colored photic resist layer within this first smooth penetrating region.

15. pixel cell as claimed in claim 11, wherein this transparent photic resist layer and another colored photic resist layer cover this first smooth penetrating region jointly.

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