CN101510022A - Display panel, electro-optical device and manufacturing method thereof - Google Patents

Abstract

A display panel, an electro-optical device and a method for manufacturing the same are provided. The substrate has a plurality of pixels, and each pixel at least comprises a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel. The color filter layer is disposed on one of the substrates and at least includes a first color filter pattern located in the first sub-pixel, a second color filter pattern located in the second sub-pixel, a third color filter pattern located in the third sub-pixel, and a fourth color filter pattern located in the fourth sub-pixel. The display medium is disposed between the substrates, and the display medium of the first sub-pixel, the second sub-pixel, the third sub-pixel and the fourth sub-pixel has a first thickness T1, a second thickness T2, a third thickness T3 and a fourth thickness T4, wherein T1 > T2 > T3 and T1 > T4 > T3.

Description

Display panel, optoelectronic device and manufacturing method thereof

technical field

The present invention relates to a display panel, an optoelectronic device and a manufacturing method thereof, and in particular to a display panel with sub-pixels (sub-pixel) of display medium (display medium) having different thicknesses, an optoelectronic device and a manufacturing method thereof. Manufacturing method.

Background technique

With the maturity of optoelectronic and semiconductor technologies, the development of flat panel displays also leaps forward. Among many flat-panel displays, liquid crystal displays have become the mainstream in the market because of their superior characteristics such as high space utilization efficiency, low power consumption, no radiation, and low electromagnetic interference.

The backlight source of traditional liquid crystal display is designed as a white light. After the white light source enters the liquid crystal panel, it can display the color of each pixel through the color filter (color filter) arranged on the position of each pixel (pixel). In addition, in a traditional liquid crystal display, a color filter layer composed of three color resists of red (R), green (G) and blue (B) is provided at each pixel position, and compared with red The pixels at positions of the three colors (R), green (G) and blue (B) are also referred to as sub-pixels. However, all colors that can be observed by the human eye can be obtained by mixing and matching the aforementioned three primary colors of red (R), green (G) and blue (B) in different shades. When the RGB three-color light is turned on to the brightest, the mixed color is white, and when the RGB lights are turned off, the mixed color is black. The darkest (black) and brightest (white) can be divided into many gray levels (grey level) according to the different levels of color depth.

However, after the light enters the color filter layer, only one-third of the light can pass through and leave the color filter layer. The light transmittance is low, resulting in poor brightness. Furthermore, the cost of materials required to manufacture the three-color color resistance is also an expenditure that cannot be ignored.

Therefore, how to overcome or improve the above-mentioned problems is an urgent problem to be solved in the production technology of the display panel at the time when the high brightness requirement of the liquid crystal display is becoming more and more important.

Contents of the invention

The invention provides a display panel with better image quality.

The present invention further provides a manufacturing method of the display panel, which enables the display panel to present better image quality by adjusting the thickness of the display medium in the sub-pixels.

The invention also provides an optoelectronic device with better image quality.

The present invention further provides a method for manufacturing an optoelectronic device to manufacture the above optoelectronic device.

The invention provides a display panel, which includes a pair of substrates, a color filter layer and a display medium. The pair of substrates has a plurality of pixels, and each pixel at least includes a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel. The color filter layer is disposed on one of the pair of substrates, wherein the color filter layer at least includes a first color filter pattern located in the first sub-pixel, a second color filter pattern located in the second sub-pixel, a third color filter pattern The color filter pattern is located in the third sub-pixel and a fourth color filter pattern is located in the fourth sub-pixel. The display medium is disposed between the pair of substrates, wherein the display medium located in the first sub-pixel has a first thickness T1, the display medium located in the second sub-pixel has a second thickness T2, and the display medium located in the third sub-pixel has a A third thickness T3, the display medium located in the fourth sub-pixel has a fourth thickness T4, wherein T1>T2>T3 and T1>T4>T3.

The invention provides a method for manufacturing a display panel, which includes the following steps. First, a pair of substrates is provided, wherein the pair of substrates has a plurality of pixels, and each pixel at least includes a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel. Next, a color filter layer is disposed on one of the pair of substrates, wherein the color filter layer at least includes a first color filter pattern located in the first sub-pixel, a second color filter pattern located in the second sub-pixel, A third color filter pattern is located in the third sub-pixel and a fourth color filter pattern is located in the fourth sub-pixel. Afterwards, a display medium is arranged between the pair of substrates, wherein the display medium located in the first sub-pixel has a first thickness T1, the display medium located in the second sub-pixel has a second thickness T2, and the display medium located in the third sub-pixel The display medium has a third thickness T3, and the display medium located in the fourth sub-pixel has a fourth thickness T4, wherein T1>T2>T3 and T1>T4>T3.

The present invention further provides an optoelectronic device, including the display panel of the above-mentioned embodiments.

The present invention further proposes a method for manufacturing an optoelectronic device, including the method for manufacturing the display panel of the above-mentioned embodiments.

To sum up, the present invention improves the problem of poor brightness and contrast in the traditional design by adding a sub-pixel and properly adjusting the thickness of the display medium corresponding to each sub-pixel, thereby achieving improved luminous efficiency, power saving, and cost saving And the effect of better image quality.

Description of drawings

FIG. 1 is a top view of a display panel of the present invention.

2 to 9 are schematic cross-sectional views of a display panel according to an embodiment of the present invention.

FIG. 10 is a gamma curve of a display panel whose display medium thickness is not properly adjusted according to sub-pixels.

FIG. 11 and FIG. 12 respectively show the relationship between the X and Y chromaticity coordinates and gray levels of the red sub-pixel in FIG. 10 .

FIG. 13 is a gamma curve of a display panel according to an embodiment of the present invention.

14 to 15 are gamma curves of a display panel of the present invention under different thicknesses of the display medium of the sub-pixels.

16 to 21 are gamma curve diagrams when the gamma curve of the white screen is adjusted to γ=1.9, 2.0, 2.1, 2.3, 2.4, and 2.5, respectively.

Fig. 22 is a gamma curve diagram of TR=TG=TB=TW=3.6um when the gamma curve of the white picture is adjusted to γ=2.2.

FIG. 23 is a gamma curve diagram of TR=TG=TB=3.8um and TW=3.6um when the gamma curve of the white picture is adjusted to γ=2.2.

FIG. 24 is a gamma curve diagram of TY>TG>TB and TY>TW>TB when the gamma curve of the white picture is adjusted to γ=2.2.

FIG. 25 is a gamma curve diagram of TR>TG>TB and TY>TW>TB when the gamma curve of the white picture is adjusted to γ=2.2.

FIG. 26 is a schematic diagram of an optoelectronic device according to an embodiment of the present invention.

Reference number

100, 300, 400, 500, 600, 700, 800, 900: display panel

110a, 110b: substrate

112: pixels

112a: the first sub-pixel

112b: second sub-pixel

112c: the third sub-pixel

112d: the fourth sub-pixel

120: color filter layer

120a: the first color filter pattern

120b: second color filter pattern

120c: third color filter pattern

120d: fourth color filter pattern

130: display media

140, 540: Overlay

320, 420, 520, 920: Overlay

T1, T2, T3, T4: Thickness

t1, t2, t3, t4: Thickness

t1', t2', t3', t4': Thickness

h1, h2, h3, h4: thickness

A: display panel

B: electronic components

C: photoelectric device

Detailed ways

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

FIG. 1 is a top view of a display panel of the present invention. Please refer to FIG. 1. In some pixels 112 shown in FIG. 1, each pixel 112 includes at least a first sub-pixel 112a and a second sub-pixel 112b. , a third sub-pixel 112c and a fourth sub-pixel 112d. However, the present invention does not specifically limit the upper limit of the number of sub-pixels that each pixel 112 can include. For example, in other embodiments, each pixel 112 can include 5, 6, 7 or 8 sub-pixels. In addition, in FIG. 1 of the embodiment of the present invention, the sub-pixels 112a, 112b, 112c, and 112d are all independently arranged, but not limited thereto. In other unillustrated embodiments, at least one fourth sub-pixel 112d can be disposed between the first sub-pixel 112a, the second sub-pixel 112b and the third sub-pixel 112c or at least one fourth The sub-pixel 112d may be disposed in at least one of the first sub-pixel 112a, the second sub-pixel 112b and the third sub-pixel 112c.

In this embodiment, the colors displayed by the first sub-pixel 112a, a second sub-pixel 112b, a third sub-pixel 112c and a fourth sub-pixel 112d are red, blue, green and white in succession, but not Not limited to this. In other embodiments, other colors on the color coordinates may also be used, such as yellow, purple, brown, yellow, cyan, pink, orange or other suitable colors. If the pixel 112 includes at least four sub-pixels, then preferably, the mixed color displayed by the first, second and third sub-pixels 112a, 112b and 112c is white (transparent). More preferably, the mixed light color presented by the first, second, third and fourth sub-pixels 112a, 112b, 112c and 112d is white (transparent).

Moreover, a display medium (not shown in FIG. 1 ) is disposed between two substrates corresponding to each sub-pixel, and the display medium is, for example, a liquid crystal material, a self-luminous material, an electrophoretic material, other suitable materials, or a combination of the above . The embodiments of the present invention take the display medium such as liquid crystal material or electrophoretic material as an example, but is not limited thereto. In addition, the display medium located in the first sub-pixel 112a has a first thickness T1 (not shown in FIG. 1 ), and the display medium located in the second sub-pixel 112b has a second thickness T2 (not shown in FIG. 1 ). , the display medium located in the third sub-pixel 112c has a third thickness T3 (not shown in FIG. 1 ), and the display medium located in the fourth sub-pixel 112d has a fourth thickness T4 (not shown in FIG. 1 ), Where T1>T2>T3 and T1>T4>T3. In detail, the sizes of T2 and T4 are not particularly limited here. In other words, the aforementioned relationship between the thicknesses of the display media located in different sub-pixels can be T1>T2>T4>T3, T1>T4>T2>T3 or T1> T4=T2>T3. Preferably T1>T4=T2>T3. Therefore, the thickness of the display medium in each sub-pixel of the present invention is different, please refer to the following embodiments.

First embodiment:

FIG. 2 is a schematic cross-sectional view of a display panel according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 2 at the same time, the display panel 100 includes a pair of substrates 110 a, 110 b, a color filter layer 120 and a display medium 130 . The pair of substrates 110a, 110b has a plurality of pixels 112, and each pixel 112 at least includes a first sub-pixel 112a, a second sub-pixel 112b, a third sub-pixel 112c and a fourth sub-pixel 112d.

In this embodiment, there is a cover layer 140 on the substrate 110a, wherein the cover layer 140 is located on the first sub-pixel 112a, the second sub-pixel 112b, the third sub-pixel 112c and the fourth sub-pixel 112d with thickness h1, h2, h3 and h4, wherein h1<h2<h3, and h1<h4<h3. For example, the covering layer 140 may be an active device array layer, a planar layer, an electrode layer, an alignment layer or a combination thereof.

In addition, in this embodiment, the material of one of the substrates 110a, 110b includes inorganic transparent materials (such as: glass, quartz, or other suitable materials, or a combination of the above), organic transparent materials (such as: polyolefin, Polymers, polyalcohols, polyesters, rubber, thermoplastic polymers, thermosetting polymers, polyaromatic hydrocarbons, polymethylmethacrylates, polycarbonates, or other suitable materials, or the above derivatives, or a combination of the above), inorganic opaque materials (such as: silicon wafers, ceramics, or other suitable materials, or a combination of the above), or a combination of the above.

The color filter layer 120 is disposed on the substrate 110b, wherein the color filter layer 120 at least includes a first color filter pattern 120a located in the first sub-pixel 112a, a second color filter pattern 120b located in the second sub-pixel 112b, a The third color filter pattern 120c is located in the third sub-pixel 112c and a fourth color filter pattern 120d is located in the fourth sub-pixel 112d. For example, the first color filter pattern 120a is, for example, a red filter pattern (R), the second color filter pattern 120b is, for example, a green color filter pattern (G), and the third color filter pattern 120c is, for example, a blue color filter pattern. filter pattern (B), and the fourth color filter pattern 120d is, for example, a white (transparent) filter pattern (W). In other embodiments, the first, second, third and fourth color filter patterns 120a, 120b, 120c and 120d can also use other colors on the color coordinates besides the above-mentioned colors, for example: Yellow, purple, brown, yellow, cyan, pink, orange or other suitable colors. Less preferably, the light mixing color of the first, second and third color filter patterns 120a, 120b and 120c is white (transparent). More preferably, the light mixing color of the first, second, third and four color filter patterns 120a, 120b, 120c and 120d is white (transparent). That is to say, if the pixel 112 includes at least four sub-pixels, it is less preferable that the mixed light color presented by the first, second and third sub-pixels 112a, 112b and 112c is white (transparent). More preferably, the mixed light color presented by the first, second, third and fourth sub-pixels 112a, 112b, 112c and 112d is white (transparent). In addition, in this embodiment, the thicknesses of the first color filter pattern 120a, the second color filter pattern 120b, the third color filter pattern 120c and the fourth color filter pattern 120d are substantially the same.

In this embodiment, the formation method of the color filter layer 120 is, for example, through steps such as spin coating process (spincoating) and baking process, to sequentially form patterned first color filter patterns in different sub-pixel regions. 120a is, for example, a red color filter pattern (R), the second color filter pattern 120b is, for example, a green color filter pattern (G), the third color filter pattern 120c is, for example, a blue color filter pattern (B), and the fourth color filter pattern 120b is, for example, a blue color filter pattern (B). The light filter pattern 120d is, for example, a transparent (white) light filter pattern (W), and then form a plurality of light-shielding patterns (not shown) between each sub-pixel; or form a plurality of light-shielding patterns first and then form the first The color filter pattern 120a is, for example, red (R), the second color filter pattern 120b is, for example, green (G), the third color filter pattern 120c is, for example, blue (B), and the fourth color filter pattern 120d is, for example, Transparent (W) color filter pattern. Of course, the manufacturing method of the color filter layer 120 is not particularly limited here, and in other embodiments, the color filter layer 120 may also be manufactured by ink-jet printing or other suitable processes.

The display medium 130 is disposed between the substrates 110a and 110b. The display medium 130 is, for example, a liquid crystal material. In particular, the display medium 130 located in the first sub-pixel 112a has a first thickness T1, the display medium 130 located in the second sub-pixel 112b has a second thickness T2, and the display medium 130 located in the third sub-pixel 112c has a first thickness T1. Three thickness T3, and the display medium 130 located in the fourth sub-pixel 112d has a fourth thickness T4, wherein T1>T2>T3 and T1>T4>T3. In detail, the sizes of T2 and T4 are not particularly limited here. In other words, the aforementioned relationship between the thicknesses of the display media located in different sub-pixels can be T1>T2>T4>T3, T1>T4>T2>T3 or T1> T4=T2>T3. Preferably T1>T4=T2>T3. It is worth mentioning that in this embodiment, the thicknesses T1, T2, T3 and T4 of the display medium 130 located in different sub-pixels are contributed by the height of the covering layer 140 located on the substrate 110a.

Second embodiment:

FIG. 3 is a schematic cross-sectional view of a display panel according to an embodiment of the present invention. Please refer to FIG. 3 . The display panel 300 is similar to the display panel 100 in the first embodiment. Please refer to FIG. 1 and the description of the first embodiment in FIG. 2 , which will not be repeated here, but the difference between this embodiment and the above-mentioned embodiments is that in this embodiment, a cover layer 320 is formed on the color filter layer 120 on the substrate 110b to cover the color filter Layer 120. It is worth mentioning that, in this embodiment, the cover layer 320 disposed on the fourth sub-pixel 112d, preferably, can also serve as the color filter pattern of the fourth sub-pixel 112d, so that the formation of the fourth sub-pixel can be saved. Pixel 112d, eg: time and cost of transparent (white) filter pattern (W).

In detail, the cover layer 320 can be a protective layer or a combination of a protective layer and an electrode layer. The protective layer can be a single layer or a multi-layer material, and its material is preferably a polymer, such as acrylic Resin (acrylic resin) or phenolic resin (novolac resin), the electrode layer can be a single-layer or multi-layer material, and its material is, for example, indium tin oxide, indium zinc oxide, indium tin zinc oxide, hafnium oxide, indium oxide , tin oxide, zinc oxide, aluminum oxide, aluminum tin oxide, aluminum zinc oxide, cadmium tin oxide, cadmium zinc oxide, or combinations thereof. In this embodiment, the thicknesses of the covering layer 320 relative to the first color filter pattern 120a, the second color filter pattern 120b, the third color filter pattern 120c and the fourth color filter pattern 120d are substantially the same. That is to say, the covering layer 320 on the first, second, third and fourth sub-pixels 112a, 112b, 112c and 112d is substantially flat.

It is worth mentioning that in this embodiment, the thicknesses T1, T2, T3 and T4 of the display medium 130 located in different sub-pixels are contributed by the height of the covering layer 140 located on the substrate 110a.

Third embodiment:

FIG. 4 is a schematic cross-sectional view of a display panel according to an embodiment of the present invention. Please refer to FIG. 4. The display panel 400 is similar to the display panel 100 in the first embodiment. Please refer to FIG. 1 and the description of the first embodiment in FIG. 2 , which will not be repeated here, but the difference between this embodiment and the first embodiment is that in this embodiment, the color filter layer 120 is disposed on the cover layer 140 on the substrate 110a. In other words, the substrate 110a is an active array substrate (Color Filter on Array substrate, COA substrate) integrated with a color filter layer. In other possible embodiments, the aforementioned color filter layer 120 may also be disposed under the covering layer 140 on the substrate 110a. In other words, the substrate 110a is a color filter substrate (Array on Color Filter substrate) integrated with an active array layer. , AOC substrate). Wherein, the film layer of the cover layer 140 may be an active element array layer, a planar layer, an electrode layer, an alignment layer or a combination thereof, or other suitable film layers.

It is worth mentioning that in this embodiment, the thicknesses T1, T2, T3 and T4 of the display medium 130 located in different sub-pixels are contributed by the height of the covering layer 140 located on the substrate 110a.

Fourth embodiment:

FIG. 5 is a schematic cross-sectional view of a display panel according to an embodiment of the present invention. Please refer to FIG. 5. The display panel 500 is similar to the display panel 100 in the first embodiment. Please refer to FIG. 1 and the description of the first embodiment in FIG. 2 , which will not be repeated here, but the difference between this embodiment and the first embodiment is that, firstly, in this embodiment, there is a cover layer 540 on the substrate 110a, which is opposite to the first sub-pixel 112a, the second sub-pixel 112b, the third sub-pixel 112c and the fourth sub-pixel 112d have substantially the same thickness. Secondly, the thicknesses of the first color filter pattern 120a, the second color filter pattern 120b, the third color filter pattern 120c and the fourth color filter pattern 120d are substantially the same. Furthermore, in this embodiment, the aforementioned color filter layer 120 on the substrate 110 b further includes forming a cover layer 520 to cover the color filter layer 120 . The thicknesses of the covering layer 520 on the first sub-pixel 112a, the second sub-pixel 112b, the third sub-pixel 112c and the fourth sub-pixel 112d are respectively t1', t2', t3' and t4', wherein t1'<t2'< t3', and t1'<t4'<t3'. It is worth mentioning that, in this embodiment, the cover layer 520 disposed at the fourth sub-pixel 112d is preferably also used as the color filter pattern of the fourth sub-pixel 112d, so that the formation of the fourth sub-pixel 112d can be saved. Color filter scheme, for example: time and cost of transparent (white) filter pattern (W).

It is worth mentioning that, in this embodiment, the thicknesses T1, T2, T3 and T4 of the display medium 130 in different sub-pixels are contributed by the height of the covering layer 520 on the substrate 110b.

Fifth embodiment:

6 is a schematic cross-sectional view of a display panel according to an embodiment of the present invention. Please refer to FIG. 6. The display panel 600 is similar to the display panel 500 in the fourth embodiment. Please refer to the fourth embodiment and related descriptions can also be used at the same time. Referring to FIG. 1 and FIG. 2 of the first embodiment, no further details are given here, but the difference between this embodiment and the fourth embodiment is that in this embodiment, the color filter layer 120 is a covering layer arranged on the substrate 110a On the layer 540, in other words, the substrate 110a is an active array substrate (Color Filter on Array substrate, COA substrate) integrated with a color filter layer.

It is worth mentioning that, in this embodiment, the thicknesses T1, T2, T3 and T4 of the display medium 130 in different sub-pixels are contributed by the height of the covering layer 520 on the substrate 110b.

Sixth embodiment:

7 is a schematic cross-sectional view of a display panel according to an embodiment of the present invention. Please refer to FIG. 7. The display panel 700 is similar to the display panel 600 in the fifth embodiment. Please refer to the fifth embodiment and related descriptions can also be used at the same time. Referring to FIG. 1 and FIG. 2 of the first embodiment, no further details are given here. The difference between this embodiment and the fifth embodiment lies in that, firstly, in this embodiment, a covering layer 540 is formed on the substrate 110 a. In addition, the cover layer 540 has substantially the same thickness as the first sub-pixel 112a, the second sub-pixel 112b, the third sub-pixel 112c and the fourth sub-pixel 112d. Secondly, in this embodiment, there is another covering layer 720 on the substrate 110b, which is opposite to the first color filter pattern 120a, the second color filter pattern 120b, the third color filter pattern 120c and the fourth color filter pattern. The covering layers 720 of the light patterns 120d have substantially the same thickness. Furthermore, the color filter layer 120 is disposed on the substrate 110a. In this embodiment, the color filter layer 120 is disposed on the cover layer 540 on the substrate 110a. The thicknesses of the first color filter pattern 120a, the second color filter pattern 120b, the third color filter pattern 120c and the fourth color filter pattern 120d are respectively t1, t2, t3 and t4, wherein t1<t2<t3 , and t1<t4<t3. In other words, when the color filter layer 120 is disposed on the cover layer 540 on the substrate 110a, the substrate 110a is an active array substrate (Color Filter on Array substrate, COA substrate) integrated with the color filter layer. When the color filter layer 120 is disposed under the covering layer 540 on the substrate 110a, the substrate 110a is a color filter substrate (Array on Color Filter substrate, AOC substrate) integrated with an active array layer.

It is worth mentioning that, in this embodiment, the thicknesses of the display media 130 located in different sub-pixels are T1, T2, T3 and T4, and the difference in thickness is determined by the first color filter pattern 120a, the second The color filter pattern 120b, the third color filter pattern 120c and the fourth color filter pattern 120d are contributed by different thicknesses.

Seventh embodiment:

8 is a schematic cross-sectional view of a display panel according to an embodiment of the present invention. Please refer to FIG. 8. The display panel 800 is similar to the display panel 700 in the sixth embodiment. Please refer to the sixth embodiment and related descriptions can also be used at the same time. Referring to FIG. 1 and FIG. 2 of the first embodiment, no further details are given here, but the difference of this embodiment is that, in this embodiment, the color filter layer 120 is disposed on the substrate 110 b as described above. In this embodiment, the thicknesses of the first color filter pattern 120a, the second color filter pattern 120b, the third color filter pattern 120c and the fourth color filter pattern 120d are t1, t2, t3 and t4 respectively, wherein t1<t2<t3, and t1<t4<t3.

It is worth mentioning that in this embodiment, the thicknesses of the display media 130 located in different sub-pixels are T1, T2, T3 and T4, and the difference in thickness is caused by the first color filter on the color filter layer 120 located on the substrate 110b. The thicknesses t1, t2, t3 and t4 of the light pattern 120a, the second color filter pattern 120b, the third color filter pattern 120c and the fourth color filter pattern 120d contribute. Therefore, the first thickness T1 of the display medium 130 located in the first sub-pixel 112a, the second thickness T2 of the display medium 130 located in the second sub-pixel 112b, the third thickness T3 of the display medium 130 located in the third sub-pixel 112c, And the relationship of the fourth thickness T4 of the display medium 130 located in the fourth sub-pixel 112d is T1>T2>T3 and T1>T4>T3.

Eighth embodiment:

FIG. 9 is a schematic cross-sectional view of a display panel according to an embodiment of the present invention. Please refer to FIG. 9. The display panel 900 is similar to the display panel 800 in the seventh embodiment. Please refer to the seventh embodiment and related descriptions can also be used at the same time. Referring to FIG. 1 and FIG. 2 of the first embodiment, no further details are given here, but the difference of this embodiment is that, in this embodiment, the aforementioned color filter layer 120 on the substrate 110b also includes a cover layer 920, and the covering layer 920 covers the surfaces of the first color filter pattern 120a, the second color filter pattern 120b, the third color filter pattern 120c and the fourth color filter pattern 120d. It is worth mentioning that, in this embodiment, the cover layer 920 disposed at the fourth sub-pixel 112d is preferably also used as the color filter pattern of the fourth sub-pixel 112d, so that the transparent ( White) time and cost of filter pattern (W).

In detail, the covering layer 920 can be a protection layer or a combination of a protection layer and an electrode layer. The protective layer can be a single-layer or multi-layer structure, and its material is, for example, acrylic resin or novolac resin. The electrode layer can be a single-layer or multi-layer structure, and its material is, for example, indium tin oxide, indium zinc oxide, indium tin zinc oxide, hafnium oxide, zinc oxide, aluminum oxide, aluminum tin oxide, aluminum zinc oxide , cadmium tin oxide, cadmium zinc oxide, or combinations thereof.

It is worth mentioning that in this embodiment, the thicknesses of the display media 130 located in different sub-pixels are T1, T2, T3 and T4, and the difference in thickness is caused by the first color filter on the color filter layer 120 located on the substrate 110b. The thicknesses t1, t2, t3 and t4 of the light pattern 120a, the second color filter pattern 120b, the third color filter pattern 120c and the fourth color filter pattern 120d contribute. Therefore, the first thickness T1 of the display medium 130 located in the first sub-pixel 112a, the second thickness T2 of the display medium 130 located in the second sub-pixel 112b, the third thickness T3 of the display medium 130 located in the third sub-pixel 112c, And the relationship of the fourth thickness T4 of the display medium 130 located in the fourth sub-pixel 112d is T1>T2>T3 and T1>T4>T3.

Compared with traditional three-primary-color (RGB) displays, at least four-color displays, such as: (RGBW), can increase the transmittance of the backlight to the display panel due to the addition of a fourth sub-pixel, such as: W sub-pixel, and thus have The advantages of improving brightness, power saving and low cost. However, because the brightness of the fourth sub-pixel, such as the W sub-pixel, is much higher than that of the first to third sub-pixels, such as the RGB sub-pixels, it is easy to cause serious color shift in the displayed image, thereby degrading the image quality. In order to prove that adjusting the thickness of the display medium of the sub-pixels in the present invention has a positive effect on reducing color shift and improving image quality, please refer to the following experiments.

Since the display must be able to provide images with appropriate grayscale performance according to local conditions, and the brightness that the human eye can actually perceive is not linearly related to changes in the intensity of ambient light, therefore, in order to improve the brightness caused by the user's environment The grayscale deviation of the image is usually set with an external resistor on the hardware to generate a voltage-transmittance curve (V-T curve), which is used to describe the light transmission characteristics of the liquid crystal panel under different voltages. The functional relationship followed by the Gamma curve is T=(i/g)γ, where T is the transmittance, g is the total number of gray levels, and i is a certain gray level in the total number of gray levels g, And γ is a constant. The at least four-color display of the present invention is exemplified by RGBW whose mixed color is white (transparent), but not limited thereto. When we adjust the gamma curve of the white screen of at least four-color display, the best state is at least four sub-pixels, for example: the voltage-transmittance curves of the four sub-pixels of RGBW overlap, so that when the gamma curve of the white screen is adjusted When γ=2.2, at least four sub-pixels, for example, the gamma curve of four RGBW sub-pixels is also γ=2.2, which can achieve better image quality.

However, when manufacturing the panel, if at least four sub-pixels, for example, the thickness of the display medium of the four sub-pixels of RGBW is not properly designed, resulting in at least four sub-pixels, for example, the voltage-transmittance curves of the four sub-pixels of RGBW do not overlap, At this time, if the gamma curve of the white picture is adjusted to γ=2.2, at least four sub-pixels, for example: the gamma curves of the four sub-pixels of RGBW will not all be γ=2.2, and because the fourth sub-pixel, for example: W The brightness of the sub-pixels is much higher than that of the first to third sub-pixels, for example, the brightness of the RGB sub-pixels has a larger weight, so it will make the first to third sub-pixels, for example: the gamma curve of the three RGB sub-pixels Farther away from γ=2.2, resulting in at least four sub-pixels, for example, the image quality of the RGBW display is not good, for example, the color tracking of the pure color will be more serious than that of the three-color display.

FIG. 10 is a gamma curve of a display panel whose display medium thickness is not properly adjusted according to sub-pixels. Please refer to Fig. 10 first. The thicknesses of the display media of the four sub-pixels of the display shown in Fig. 10 have not been properly adjusted. Therefore, the thickness of the display media of the red sub-pixel is TR = 3.6um, the thickness of the display media of the green sub-pixel is TG = 3.6um, and the thickness of the display media of the blue sub-pixel is TG = 3.6um. The display medium thickness of the color sub-pixel is TB=3.6um, and the display medium thickness of the transparent (white) sub-pixel is TW=4.2um as an example. The X-axis represents the number of gray scales, while the Y-axis represents the light transmittance. When the gamma curve of the white screen is adjusted to γ=2.2, the voltage-transmittance curve gamma curve of each color sub-pixel will not be equal to 2.2 (γ=2.2), and at least four color sub-pixels, for example: RGBW The gamma curves will be clearly separated.

FIG. 11 and FIG. 12 respectively show the relationship between the X and Y chromaticity coordinates and gray levels of the red sub-pixel in FIG. 10 . Please refer to FIG. 11 and FIG. 12 at the same time. As mentioned above, because the brightness of the transparent (white) sub-pixel W is much higher than the brightness of the three primary color sub-pixels RGB, when the thickness of the display medium of the sub-pixel is not adjusted, the transparent (white) ) sub-pixel W will occupy a higher weight in the sum of the overall brightness, and make the gamma curve of the red sub-pixel R, which is originally darker in brightness, farther away from γ=2.2, causing the red color tracking (color tracking) performance to deviate from The ideal curve is more severe.

FIG. 13 is a gamma curve of a display panel according to an embodiment of the present invention. Please refer to FIG. 13 , the thickness of the display medium of at least four color sub-pixels of the display has been properly designed and adjusted. The at least four sub-pixels in the present invention are exemplified by RGBW whose mixed color is white (transparent), but not limited thereto. In detail, the thickness of the display medium of the red sub-pixel is exemplified by TR=4.2um, the thickness of the display medium of the green sub-pixel is exemplified by TG=3.8um, and the thickness of the display medium of the blue sub-pixel is exemplified by TB=3.5um. The thickness of the display medium of the transparent (white) sub-pixel is exemplified by TW=3.8um. The display medium thickness described in the present invention is just an example, not intended to limit the scope of the present invention. The X-axis represents the number of gray scales, while the Y-axis represents the light transmittance. When the gamma curve of the white screen is adjusted to γ=2.2, the voltage-transmittance curve and at least four color sub-pixels, for example, the gamma curves of RGBW are almost 2.2 (γ=2.2).

From FIGS. 10 to 13 , it can be clearly seen that the method of adjusting the thickness of the display medium between the sub-pixels in the present invention has a positive effect on reducing color shift and improving image quality. In other words, by adjusting the thickness of the display medium of the sub-pixels, at least four sub-pixels, for example, the gamma curves of RGBW are almost all at γ=2.2, and the image quality is relatively better.

In addition, in order to obtain better image quality, at least four sub-pixels of the display, for example, the relationship between the display medium thickness of RGBW needs to be: TR>TG>TB and TR>TW>TB, so that each sub-pixel The voltage-transmittance curve (V-T curve) is as close as possible, and the gamma curve is also as close as possible to present better image quality. However, the present invention does not limit the size relationship between TG and TW, except TG=TW as shown in FIG. 13 , TG can also be larger than TW or smaller than TW. The following will take FIG. 15 and FIG. 16 as an example for illustration.

14 to 15 are gamma curves of a display panel of the present invention under different thicknesses of the display medium of the sub-pixels. Please refer to FIG. 14 , the thickness of the display medium of each sub-pixel of the display is properly designed and adjusted to: TR=4.2um, TG=3.8um, TB=3.5um, and TW=3.6um as an example. That is, TR>TG>TB, TR>TW>TB and TG>TW. Similarly, when the gamma curve of the white picture is adjusted to γ=2.2, the voltage-transmittance curves of the three primary color sub-pixels RGB roughly overlap and are close to γ=2.2, while the voltage of the transparent (white) sub-pixel W- The transmittance curve is slightly lower than the gamma curve of the three-color sub-pixel RGB.

Please refer to FIG. 15 , the thickness of the display medium of at least four sub-pixels in the display is properly designed and adjusted. The at least four sub-pixels in the present invention are exemplified by RGBW whose mixed color is white (transparent), but not limited thereto. In detail, TR=4.2um, TG=3.8um, TB=3.5um, and TW=4.0um are examples. That is, TR>TG>TB, TR>TW>TB and TG<TW. The X-axis represents the number of gray scales, while the Y-axis represents the light transmittance. When the gamma curve of the white screen is adjusted to γ=2.2, the voltage-transmittance curves of the three primary color sub-pixels RGB roughly overlap and are close to γ=2.2, while the voltage-transmittance curve of the transparent (white) sub-pixel W Slightly higher than the gamma curve of RGB sub-pixels.

In addition, although γ=2.2 is used as the constant of the gamma curve in many previous examples, the present invention is not limited to obtain better display quality only when γ=2.2. For example, γ may also be 1.9, 2.0, 2.1, 2.3, 2.4, 2.5 or other suitable constants. The following will take FIG. 16 to FIG. 21 as an example for description.

16 to 21 are gamma curve diagrams when the gamma curve of the white screen is adjusted to γ=1.9, 2.0, 2.1, 2.3, 2.4, and 2.5, respectively. From Figures 16 to 21, it can be clearly seen that the method of controlling the thickness of the display medium between the sub-pixels in the present invention, when γ=1.9, 2.0, 2.1, 2.3, 2.4, and 2.5, the gamma curves of the sub-pixels of each color remain the same. There is no obvious deviation, which has a positive effect on reducing color cast and improving image quality.

FIG. 22 is a gamma curve diagram of an example of TR=TG=TB=TW=3.6um when the gamma curve of the white picture is adjusted to γ=2.2. FIG. 23 is an example gamma curve diagram of TR=TG=TB=3.8um and TW=3.6um when the gamma curve of the white picture is adjusted to γ=2.2. It can be clearly seen from Figures 22 to 23 that when the thickness of the display medium layer of the three sub-pixels, such as RGB, and the fourth sub-pixel, such as the display medium layer of W, are not specially designed and adjusted, the thickness of each color sub-pixel The gamma curve will deviate significantly from γ=2.2.

In addition, the adjustment of the thickness of the display medium of at least four sub-pixels, such as red, green, blue, and transparent (RGBW) sub-pixels, can have a positive impact on reducing color shift and improving image quality of the display. For other color sub-pixels, such as yellow, green, blue, and transparent (YGBW), the effect of reducing color shift and improving image quality is limited. That is to say, when the mixed colors presented by at least three of the first to fourth sub-pixels are not substantially equal to white (transparent), the effect on reducing color shift and improving image quality is limited, or even has no effect. Figure 24 to Figure 25 are examples for illustration.

Figure 24 shows that when the gamma curve of the white screen is adjusted to γ=2.2, the display medium thickness of the yellow sub-pixel is TY=4.0um, the display medium thickness of the green sub-pixel is TG=3.8um, and the display medium thickness of the blue sub-pixel is TB= The display medium thickness TW=3.6um of 3.5um and transparent (white) sub-pixel is an example, that is, the gamma curve of TY>TG>TB and TY>TW>TB. Fig. 25 is an example when the gamma curve of the white screen is adjusted to γ=2.2, TR=4.2um, TG=3.8um, TB=3.5um, TY=4.0um, TW=3.6um. That is, the gamma curve graph of TR>TG>TB and TY>TW>TB. Please refer to FIG. 24 first, the display with YGBW four-color sub-pixels can display a smaller color gamut than the RGBW four-color display, that is, it can display fewer colors. If an additional red R sub-pixel is added to a display with YGBW four-color sub-pixels, as shown in FIG. 25 , the overall chromaticity in red will be slightly better than that in FIG. 24 . However, in the above-mentioned FIG. 24 and FIG. 25 , the gamma curves of each sub-pixel are still not completely concentrated on γ=2.2.

FIG. 26 is a schematic diagram of an optoelectronic device according to an embodiment of the present invention. Please refer to FIG. 26, the display panel A can be electrically connected with the electronic component B to form an optoelectronic device C, and the display panel A is, for example, the display panel 100, 300, 400, 500, 600, 700, 800, or 900 of them. The manufacturing method of the display panel A includes the manufacturing method of the display panel 100, 300, 400, 500, 600, 700, 800, or 900 as described above, and then assembles the obtained display according to the manufacturing procedures of various electronic components B to obtain an optoelectronic device c.

In addition, the electronic component B includes, for example, a control component, an operating component, a processing component, an input component, a memory component, a drive component, a light emitting component, a protection component, a sensing component, a detection component, or other functional components, or a combination thereof. The types of optoelectronic devices C include portable products (such as mobile phones, video cameras, cameras, notebook computers, game consoles, watches, music players, electronic letter transceivers, map navigators, digital photos, or similar products), audio-visual products ( Such as audio-visual projectors or similar products), screens, televisions, billboards, panels inside projectors, etc.

To sum up, the present invention adjusts the thickness of the display medium in each sub-pixel of the display panel, so that the voltage-transmittance curve of each sub-pixel is roughly as close as possible, and the adjusted gamma curve can also be as close as possible, so it can present Better image quality.

Although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be subject to the scope defined by the claims.

Claims (18)

1. a display panel is characterized in that, described display panel comprises:

A pair of substrate, wherein this has a plurality of pixels to substrate, and each pixel comprises one first sub-pixel, one second sub-pixel, one the 3rd sub-pixel and one the 4th sub-pixel at least;

One chromatic filter layer, be arranged at this to substrate on one of them, wherein said chromatic filter layer comprises that at least one first color filter pattern is positioned at that described first sub-pixel, one second color filter pattern are positioned at described second sub-pixel, one the 3rd color filter pattern is positioned at described the 3rd sub-pixel and one the 4th color filter pattern is positioned at described the 4th sub-pixel;

One display medium, be arranged at this between the substrate, the described display medium that wherein is positioned at described first sub-pixel has one first thickness T 1, the described display medium that is positioned at described second sub-pixel has one second thickness T 2, the described display medium that is positioned at described the 3rd sub-pixel has one the 3rd thickness T 3, the described display medium that is positioned at described the 4th sub-pixel has one the 4th thickness T 4, wherein T1〉T2〉T3 and T1〉T4〉T3.

2. display panel as claimed in claim 1, it is characterized in that, the thickness of the described first color filter pattern, the described second color filter pattern, described the 3rd color filter pattern and described the 4th color filter pattern is respectively t1, t2, t3 and t4, wherein t1＜t2＜t3, and t1＜t4＜t3.

3. display panel as claimed in claim 1 is characterized in that described display panel more comprises an overlayer, covers described chromatic filter layer.

4. display panel as claimed in claim 3 is characterized in that, is arranged at the color filter pattern of the described overlayer of described these the 4th sub-pixel parts as described the 4th sub-pixel.

5. display panel as claimed in claim 3, it is characterized in that, described overlayer is respectively t1 ', t2 ', t3 ' and t4 ' in the thickness of described first sub-pixel, described second sub-pixel, described the 3rd sub-pixel and described the 4th sub-pixel, wherein t1 '＜t2 '＜t3 ', and t1 '＜t4 '＜t3 '.

6. display panel as claimed in claim 3, it is characterized in that, described display panel more comprises another overlayer, it is arranged on the different substrates with described overlayer, the thickness that wherein said another overlayer is positioned at described first sub-pixel, described second sub-pixel, described the 3rd sub-pixel and described the 4th sub-pixel is respectively h1, h2, h3 and h4, wherein h1＜h2＜h3, and h1＜h4＜h3.

7. display panel as claimed in claim 3 is characterized in that described display panel more comprises another overlayer, and itself and described chromatic filter layer are arranged on the same substrate.

8. display panel as claimed in claim 7, it is characterized in that, the thickness that described another overlayer is positioned at described first sub-pixel, described second sub-pixel, described the 3rd sub-pixel and described the 4th sub-pixel is respectively h1, h2, h3 and h4, wherein h1＜h2＜h3, and h1＜h4＜h3.

9. the manufacture method of a display panel is characterized in that, the manufacture method of described display panel comprises:

A pair of substrate is provided, and wherein this has a plurality of pixels to substrate, and each pixel comprises one first sub-pixel, one second sub-pixel, one the 3rd sub-pixel and one the 4th sub-pixel at least;

Be provided with a chromatic filter layer in this to substrate on one of them, wherein said chromatic filter layer comprises that at least one first color filter pattern is positioned at that described first sub-pixel, one second color filter pattern are positioned at described second sub-pixel, one the 3rd color filter pattern is positioned at described the 3rd sub-pixel and one the 4th color filter pattern is positioned at described the 4th sub-pixel;

One display medium is set between this is to substrate, the described display medium that wherein is positioned at described first sub-pixel has one first thickness T 1, the described display medium that is positioned at described second sub-pixel has one second thickness T 2, the described display medium that is positioned at described the 3rd sub-pixel has one the 3rd thickness T 3, the described display medium that is positioned at described the 4th sub-pixel has one the 4th thickness T 4, wherein T1〉T2〉T3 and T1〉T4〉T3.

10. the manufacture method of display panel as claimed in claim 9, it is characterized in that, the thickness of the described first color filter pattern, the described second color filter pattern, described the 3rd color filter pattern and described the 4th color filter pattern is respectively t1, t2, t3 and t4, wherein t1＜t2＜t3, and t1＜t4＜t3.

11. the manufacture method of display panel as claimed in claim 9 is characterized in that, described method comprises that more covering one overlayer is in described chromatic filter layer.

12. the manufacture method of display panel as claimed in claim 11 is characterized in that, is arranged at the color filter pattern of the described overlayer of described these the 4th sub-pixel parts as described the 4th sub-pixel.

13. the manufacture method of display panel as claimed in claim 11, it is characterized in that, the thickness that described overlayer is positioned at described first sub-pixel, described second sub-pixel, described the 3rd sub-pixel and described the 4th sub-pixel is respectively t1 ', t2 ', t3 ' and t4 ', wherein t1 '＜t2 '＜t3 ', and t1 '＜t4 '＜t3 '.

14. the manufacture method of display panel as claimed in claim 11, it is characterized in that, described method more comprises another overlayer of formation, it is positioned on the different substrates with described overlayer, the thickness that wherein said another overlayer is positioned at described first sub-pixel, described second sub-pixel, described the 3rd sub-pixel and described the 4th sub-pixel is respectively h1, h2, h3 and h4, wherein h1＜h2＜h3, and h1＜h4＜h3.

15. the manufacture method of display panel as claimed in claim 11 is characterized in that, described method more comprises another overlayer of formation, and it is positioned on the identical substrate with described chromatic filter layer.

16. the manufacture method of display panel as claimed in claim 9, it is characterized in that, the thickness that described another overlayer is positioned at described first sub-pixel, described second sub-pixel, described the 3rd sub-pixel and described the 4th sub-pixel is respectively h1, h2, h3 and h4, wherein h1＜h2＜h3, and h1＜h4＜h3.

17. an electrooptical device is characterized in that described electrooptical device comprises display panel as claimed in claim 1.

18. the manufacture method of an electrooptical device is characterized in that, described method comprises the manufacture method of display panel as claimed in claim 9.

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