CN109935623B

CN109935623B - Display device

Info

Publication number: CN109935623B
Application number: CN201910271104.9A
Authority: CN
Inventors: 李俊育; 郭雅佩
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2018-06-22
Filing date: 2019-04-04
Publication date: 2021-01-22
Anticipated expiration: 2039-04-04
Also published as: CN109935623A

Abstract

The invention discloses a display device which is provided with a plurality of pixel areas, wherein each pixel area comprises a central pixel area and an edge pixel area positioned at the periphery of the central pixel area. The display device comprises a substrate, a plurality of light-emitting structures and a plurality of color filter patterns. The light emitting structures are arranged on the substrate and are respectively positioned in the pixel areas. The plurality of color filter patterns are arranged corresponding to the plurality of light emitting structures. The plurality of color filter patterns include a first color filter pattern and a second color filter pattern. The light transmittance of the first color filter pattern in the central pixel region is less than that of the first color filter pattern in the edge pixel region. The light transmittance of the second color filter pattern in the central pixel region is greater than that of the second color filter pattern in the edge pixel region.

Description

Display device

Technical Field

The present invention relates to a display device, and more particularly, to a self-luminous display device.

Background

In recent years, compared with the mainstream liquid crystal display panel, an Organic light-emitting diode (OLED) display panel has high color saturation, fast response speed and high contrast performance, and thus gradually attracts the investment of various scientific and technological industries. However, even if the OLED display panel has the above-mentioned excellent display quality, the market occupation rate at the consumer end cannot be significantly increased under the condition that the manufacturing cost is high and the service life cannot compete with that of the current mainstream display.

In order to seek a lower-cost manufacturing method, the development of production equipment and related materials is one of the efforts of many manufacturers, and the formation of a light-emitting material layer on a substrate by Ink Jet Printing (IJP) is one of the key technologies at present. However, the light-emitting material layer formed by inkjet coating has different film thicknesses at different positions in each pixel region due to the difference in topography, so that the emergent light at the center and edge of each pixel region has obvious color difference, resulting in a decrease in the overall color gamut of the display panel. Therefore, how to overcome the above technical bottlenecks is an urgent issue to be solved by the current technology factories.

Disclosure of Invention

The invention provides a display device with good color expression.

The display device of the invention is provided with a plurality of pixel areas, and each pixel area comprises a central pixel area and an edge pixel area positioned at the periphery of the central pixel area. The display device comprises a substrate, a plurality of light-emitting structures and a plurality of color filter patterns. The light emitting structures are arranged on the substrate and are respectively positioned in the pixel areas. The plurality of color filter patterns are arranged corresponding to the plurality of light emitting structures. The plurality of color filter patterns include a first color filter pattern and a second color filter pattern. The light transmittance of the first color filter pattern in the central pixel area is less than that of the first color filter pattern in the edge pixel area, and the light transmittance of the second color filter pattern in the central pixel area is greater than that of the second color filter pattern in the edge pixel area.

In an embodiment of the invention, each of the light emitting structures of the display device includes a light emitting material layer. The light-emitting material layer has a first thickness and a second thickness in the central pixel region and the edge pixel region, respectively, and the second thickness is greater than the first thickness.

In an embodiment of the invention, the first color filter pattern of the display device has a first thickness and a second thickness in the central pixel region and the edge pixel region, respectively, and the first thickness is greater than the second thickness. The second color filter pattern has a third thickness and a fourth thickness in the central pixel region and the edge pixel region, respectively, and the third thickness is smaller than the fourth thickness.

In an embodiment of the invention, the edge pixel region of each pixel region of the display device includes an inner edge pixel region and an outer edge pixel region. The inner edge pixel region is located between the outer edge pixel region and the central pixel region. The light transmittance of the first color filter pattern in the inner edge pixel region is greater than that of the first color filter pattern in the outer edge pixel region. The light transmittance of the second color filter pattern in the inner edge pixel region is less than that of the second color filter pattern in the outer edge pixel region.

In an embodiment of the invention, a thickness of the first color filter pattern of the display device is decreased from the central pixel region to the outer edge pixel region, and a thickness of the second color filter pattern is increased from the central pixel region to the outer edge pixel region.

In an embodiment of the invention, the plurality of light emitting structures of the display device include a first light emitting structure and a second light emitting structure. The first color filter pattern and the second color filter pattern are respectively overlapped on the first light-emitting structure and the second light-emitting structure. The first light emitting structure and the first color filter pattern are used for displaying red. The second light-emitting structure and the second color filter pattern are used for displaying blue or green.

In an embodiment of the invention, a difference between light transmittance rates of the first color filter pattern in the central pixel region and the first color filter pattern in the edge pixel region of the display device is between 15% and 30%.

In an embodiment of the invention, a light transmittance difference between the central pixel region and the edge pixel region of the second color filter pattern of the display device is between 20% and 50%.

In an embodiment of the invention, the first color filter pattern of the display device includes a first blend, and a concentration of the first blend in the central pixel region of the first color filter pattern is greater than a concentration of the first blend in the edge pixel region of the first color filter pattern. The second color filter pattern includes a second blend, and a concentration of the second blend in the central pixel region of the second color filter pattern is less than a concentration of the second blend in the edge pixel region of the second color filter pattern.

In an embodiment of the invention, the materials of the first blend and the second blend of the display device include dyes, pigments, or combinations thereof.

In an embodiment of the invention, each color filter pattern of the display device has a stepped surface facing the substrate.

In an embodiment of the invention, each color filter pattern of the display device has a slope-shaped surface facing the substrate.

In an embodiment of the invention, each color filter pattern of the display device has an arc-shaped surface facing the substrate.

In an embodiment of the invention, vertical projections of an edge of the central pixel region and an edge of the edge pixel region of each pixel region of the display device on the substrate are separated by a first distance and a second distance in a first direction and a direction perpendicular to the first direction, respectively, and the first distance is greater than the second distance.

Based on the above, in the display device according to the embodiment of the invention, the color filter patterns have different light transmittance in the central pixel area and the edge pixel area, so that the chromaticities of the two light beams respectively generated by the corresponding light emitting structures in the central pixel area and the edge pixel area after passing through the color filter patterns are similar, thereby improving the light emitting uniformity of the pixel areas and further improving the color performance of the display device.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a schematic top view of a display device according to a first embodiment of the invention.

Fig. 2 is a schematic cross-sectional view of the display device in fig. 1.

Fig. 3 is a schematic cross-sectional view of a display device according to a second embodiment of the invention.

Fig. 4 is a schematic cross-sectional view of a display device according to a third embodiment of the invention.

Fig. 5 is a schematic cross-sectional view of a display device according to a fourth embodiment of the invention.

Wherein, the reference numbers:

10. 10A to 10C, 20: display device

100: substrate

150: isolation structure

200. 201, 202: light emitting structure

210: luminescent material layer

220: a first electrode

230: second electrode

300: color filter layer

310. 310A to 310C: color filter pattern

311. 311A to 311C: a first color filter pattern

311 s: stepped convex surface

311 As: slope-shaped convex surface

311 Bs: arc convex surface

312. 312A to 312C: second color filter pattern

312 s: stepped concave surface

312 As: slope-shaped concave surface

312 Bs: arc concave surface

400: filling layer

AD. AD1, AD 2: blends

BM: shading pattern

CR: center pixel region

CT1, CT 2: center thickness

D1: direction of rotation

EML: luminescent layer

ER: edge pixel region

ER 1: inner edge pixel region

ER 2: outer edge pixel region

ET1, ET 3: inner edge thickness

ET2, ET 4: outer edge thickness

ETL: electron transport layer

HIL: hole injection layer

HTL: hole transport layer

L1: first distance

L2: second distance

PR: pixel region

T1: a first thickness

T2: second thickness

T3: third thickness

W1: first width

W2: second width

A-A': cutting line

Detailed Description

As used herein, "about", "approximately", "essentially", or "substantially" includes the stated value and the average value within an acceptable range of deviation of the specified value as determined by one of ordinary skill in the art, taking into account the measurement in question and the specified amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within, for example, ± 30%, ± 20%, ± 15%, ± 10%, ± 5%. Further, as used herein, "about", "approximately", "essentially", or "substantially" may be selected with respect to measured properties, cutting properties, or other properties, to select a more acceptable range of deviation or standard deviation, and not to apply one standard deviation to all properties.

In the drawings, the thickness of layers, films, panels, regions, etc. have been exaggerated for clarity. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. As used herein, "connected" may refer to physical and/or electrical connections. Further, "electrically connected" may mean that there are other elements between the two elements.

Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.

Fig. 1 is a schematic top view of a display device 10 according to a first embodiment of the invention. Fig. 2 is a schematic cross-sectional view of the display device 10 in fig. 1. Fig. 2 corresponds to the section line a-a' in fig. 1. It should be noted that, for the sake of clarity, fig. 1 only shows the substrate 100 and the color filter pattern 310 in fig. 2.

Referring to fig. 1 and 2, the display device 10 includes a substrate 100 and an isolation structure 150. In detail, the display device 10 has a plurality of pixel regions PR arranged in an array, and each pixel region PR includes a central pixel region CR and an edge pixel region ER located at the periphery of the central pixel region CR. The isolation structures 150 are disposed between any two adjacent pixel regions PR, and more specifically, the isolation structures 150 may define a plurality of pixel regions PR of the display device 10. In the present embodiment, the substrate 100 may include a driving circuit layer (e.g., data lines, scan lines, peripheral traces), a driving element (e.g., thin film transistor, capacitor), but the invention is not limited thereto. In some embodiments, the isolation structure 150 may be made of a hydrophobic material, such as fluorine-rich (fluorine-rich) negative photoresist.

The perpendicular projections of the edge of the center pixel region CR and the edge of the edge pixel region ER of each pixel region PR on the substrate 100 are separated by a first distance L1 and a second distance L2 in the direction D1 and the perpendicular direction D1, respectively, and the first distance L1 is greater than the second distance L2. However, the invention is not limited thereto, and according to other embodiments, the first distance L1 and the second distance L2 may be substantially equal, or the first distance L1 is smaller than the second distance L2.

In the present embodiment, the edge pixel region ER may include an inner edge pixel region ER1 and an outer edge pixel region ER2, and the inner edge pixel region ER1 is located between the outer edge pixel region ER2 and the central pixel region CR. The inner and outer edge pixel regions referred to herein may be understood as a portion of the edge pixel region ER relatively closer to the central pixel region CR, namely, an inner edge pixel region ER1, and a portion relatively farther from the central pixel region CR, namely, an outer edge pixel region ER 2. However, the invention is not limited thereto, and according to other embodiments, the number of the inner edge pixel regions ER1 and the outer edge pixel regions ER2 of the substrate 100 may be determined according to actual requirements.

As shown in fig. 2, the display device 10 further includes a plurality of light emitting structures 200 respectively disposed on the substrate 100 and in the plurality of pixel regions PR. Each of the light emitting structures 200 includes a light emitting material layer 210, and the light emitting material layer 210 has a first thickness T1 and a second thickness T2 in the central pixel region CR and the inner edge pixel region ER1, respectively, and the second thickness T2 is greater than the first thickness T1. For example, in the embodiment, the light emitting material layer 210 further has a third thickness T3 in the outer edge pixel region ER2, and the third thickness T3 is greater than the second thickness T2, that is, the thickness of the light emitting material layer 210 is increased from the central pixel region CR to the outer edge pixel region ER2, but the invention is not limited thereto.

In the present embodiment, the first thickness T1, the second thickness T2, and the third thickness T3 are respectively defined by the thickness of the light emitting material layer 210 at the center of the central pixel region CR, the inner edge pixel region ER1, and the outer edge pixel region ER 2. However, the definition of the first thickness T1, the second thickness T2, and the third thickness T3 are not limited in the present invention, and in other embodiments, the first thickness T1, the second thickness T2, and the third thickness T3 may be defined by the average thickness of the light emitting material layer 210 in the central pixel region CR, the inner edge pixel region ER1, and the outer edge pixel region ER2, respectively.

The plurality of light emitting structures 200 may include a first light emitting structure 201 and a second light emitting structure 202. In the embodiment, the light emitting material layer 210 of the first light emitting structure 201 is, for example, a material layer capable of emitting red light, and the light emitting material layer 210 of the second light emitting structure 202 is, for example, a material layer capable of emitting green light, but the invention is not limited thereto. According to other embodiments, the light emitting material layer 210 of the second light emitting structure 202 may also be a material layer capable of emitting blue light.

In accordance with the above, the light emitting material layer 210 may include a hole injection layer HIL, a hole transport layer HTL, a light emitting layer EML, and an electron transport layer ETL, which are sequentially stacked, but the invention is not limited thereto. In the present embodiment, the hole injection layer HIL, the hole transport layer HTL, the light emitting layer EML, and the electron transport layer ETL can be respectively implemented by any hole input layer, any hole transport layer, any light emitting layer, and any electron transport layer for a display device, which are well known in the art, and the hole injection layer HIL, the hole transport layer HTL, the light emitting layer EML, and the electron transport layer ETL can be respectively formed by any method well known in the art.

Each of the light emitting structures 200 further includes a first electrode 220 and a second electrode 230, and the first electrode 220, the light emitting material layer 210 and the second electrode 230 are sequentially stacked on the substrate 100. For example, in the present embodiment, the second electrodes 230 of the light-emitting structures 200 may be electrically connected to each other and formed by a conductive layer continuously covering the isolation structure 150 and the pixel region PR, but the invention is not limited thereto. In other embodiments, the plurality of second electrodes 230 of the plurality of light emitting structures 200 may also be structurally separated from each other.

In the present embodiment, the first electrode 220 and the second electrode 230 are, for example, light-transmissive electrodes, and the material of the light-transmissive electrodes includes metal oxides, such as: indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, or other suitable oxide, or a stack of at least two of the foregoing. However, the invention is not limited thereto, and in other embodiments, the first electrode 220 may also be a reflective electrode, and the material of the reflective electrode includes an alloy, a nitride of a metal material, an oxide of a metal material, an oxynitride of a metal material, or other suitable materials, or a stack of a metal material and other conductive materials.

The display device 10 further includes a color filter layer 300 disposed on the plurality of light emitting structures 200. The color filter layer 300 includes a plurality of color filter patterns 310 respectively disposed corresponding to the plurality of light emitting structures 200. In the present embodiment, the plurality of color filter patterns 310 includes a first color filter pattern 311 and a second color filter pattern 312, and the first color filter pattern 311 and the second color filter pattern 312 are respectively overlapped on the first light emitting structure 201 and the second light emitting structure 202. Specifically, the vertical projection of the first light emitting structure 201 on the substrate 100 is located within the vertical projection of the first color filter pattern 311 on the substrate 100, and the vertical projection of the second light emitting structure 202 on the substrate 100 is located within the vertical projection of the second color filter pattern 312 on the substrate 100.

Referring to fig. 1, for example, in the present embodiment, each pixel region PR has a first width W1 in a direction perpendicular to the direction D1, each color filter pattern 310 has a second width W2 in a direction perpendicular to the direction D1, and a ratio of the first width W1 to the second width W2 is between 1 and 1.2. That is, a portion of each color filter pattern 310 outside the pixel region PR may overlap the isolation structure 150, but the invention is not limited thereto.

Particularly, in the present embodiment, the first color filter pattern 311 is, for example, a red filter pattern, and the second color filter pattern 312 is, for example, a green filter pattern. That is, the first light emitting structure 201 and the first color filter pattern 311 can display red, and the second light emitting structure 202 and the second color filter pattern 312 can display green. However, the invention is not limited thereto, and according to other embodiments, the light emitting material layer 210 of the second light emitting structure 202 is, for example, a material layer capable of emitting blue light, and the second color filter pattern 312 may be a blue color filter pattern, that is, the second light emitting structure 202 and the second color filter pattern 312 may be configured to display blue color.

In the present embodiment, the light transmittance of the first color filter pattern 311 in the central pixel region CR is less than that of the first color filter pattern 311 in the edge pixel region ER, and the light transmittance of the second color filter pattern 312 in the central pixel region CR is greater than that of the second color filter pattern 312 in the edge pixel region ER. In some embodiments, the light transmittance difference of the first color filter pattern 311 (e.g., the red filter pattern) in the central pixel region CR and the edge pixel region ER may be between 15% and 30%. In other embodiments, the light transmittance difference between the central pixel region CR and the edge pixel region ER of the second color filter pattern 312 (e.g., the blue filter pattern) may be between 20% and 40%. In still other embodiments, the light transmittance difference between the central pixel region CR and the edge pixel region ER of the second color filter pattern 312 (e.g., the green filter pattern) may be between 30% and 50%.

It should be noted that in the process of inkjet coating, more material is accumulated in the edge pixel region ER of the luminescent material layer 210 of each light emitting structure 200, so that the thickness of the luminescent material layer 210 after film formation (for example, the second thickness T2 and the third thickness T3) in the edge pixel region ER is greater than the thickness of the luminescent material layer 210 in the center pixel region CR (for example, the first thickness T1), which causes the luminescent material layer 210 to have a color difference between two light rays emitted from the edge pixel region ER and the center pixel region CR, respectively. Therefore, the color filter pattern 310 has different light transmittance in the central pixel region CR and the edge pixel region ER, so that the two lights have similar chromaticity after passing through the color filter pattern 310, thereby improving the light-emitting uniformity of the pixel region.

Referring to fig. 2, in the embodiment, the light transmittance of the first color filter pattern 311 in the inner edge pixel area ER1 may be smaller than the light transmittance of the first color filter pattern 311 in the outer edge pixel area ER2, and the light transmittance of the second color filter pattern 312 in the inner edge pixel area ER1 may be greater than the light transmittance of the second color filter pattern 312 in the outer edge pixel area ER2, but the invention is not limited thereto. That is, the light transmittance of the first color filter pattern 311 increases from the central pixel region CR to the outer edge pixel region ER2, and the light transmittance of the second color filter pattern 312 decreases from the central pixel region CR to the outer edge pixel region ER 2.

From another perspective, the first color filter pattern 311 has a center thickness CT1, an inner edge thickness ET1 and an outer edge thickness ET2 in the center pixel region CR, the inner edge pixel region ER1 and the outer edge pixel region ER2, respectively, and the center thickness CT1 is greater than the inner edge thickness ET1, and the inner edge thickness ET1 is greater than the outer edge thickness ET 2. The second color filter pattern 312 has a center thickness CT2, an inner edge thickness ET3 and an outer edge thickness ET4 in the center pixel region CR, the inner edge pixel region ER1 and the outer edge pixel region ER2, respectively, and the center thickness CT2 is smaller than the inner edge thickness ET3 and the inner edge thickness ET3 is smaller than the outer edge thickness ET 4.

That is, the thickness of the first color filter pattern 311 is reduced from the center pixel region CR to the outer edge pixel region ER2, and the thickness of the second color filter pattern 312 is increased from the center pixel region CR to the outer edge pixel region ER 2. For example, in the embodiment, the color filter pattern 310 has a stepped surface facing the substrate 100, but the invention is not limited thereto. More specifically, the thickness of the first color filter pattern 311 is reduced in a stepwise manner from the center pixel region CR to the outer edge pixel region ER2, and the thickness of the second color filter pattern 312 is increased in a stepwise manner from the center pixel region CR to the outer edge pixel region ER2, that is, the first color filter pattern 311 and the second color filter pattern 312 respectively have a convex surface 311s and a concave surface 312s in a stepwise manner facing the substrate 100. The convex surface means that the surface of the color filter pattern 310 facing the substrate 100 is closer to the substrate 100 in the central portion and the edge portion is farther from the substrate, and the concave surface means that the surface of the color filter pattern 310 facing the substrate 100 is farther from the substrate in the central portion and the edge portion is closer to the substrate.

It should be noted that, in the present embodiment, the color filter pattern 310 has different light transmittance in the central pixel region CR and the edge pixel region ER by having different thicknesses in the central pixel region CR and the edge pixel region ER, respectively. In the present embodiment, the material of the color filter pattern 310 may include diffusion particles, light conversion material, pigment, dye, or a combination thereof.

The color filter layer 300 may further include light-shielding patterns BM disposed between any two adjacent color filter patterns 310, and the light-shielding patterns BM overlap the isolation structures 150. In detail, the vertical projection of the light shielding pattern BM on the substrate 100 is located within the vertical projection of the isolation structure 150 on the substrate 100, i.e. at the gap between the pixel regions PR. The display device 10 may further include a filling layer 400 disposed between the plurality of light emitting structures 200 and the color filter layer 300, but the invention is not limited thereto. In the present embodiment, the material of the filling layer 400 may include silicon nitride, aluminum oxide, aluminum carbonitride, silicon oxynitride, acryl resin, Hexamethyldisiloxane (HMDSO), or glass. In addition, although not shown in fig. 2, in some embodiments, the display device 10 may further include another substrate, the color filter layer 300 is disposed on the another substrate, and the light-emitting structure 200 and the color filter layer 300 are both sandwiched between the substrate 100 and the another substrate.

Fig. 3 is a schematic cross-sectional view of a display device 10A according to a second embodiment of the invention. Referring to fig. 3, the display device 10A of the present embodiment is different from the display device 10 in fig. 2 in that: the color filter pattern 310A of the display device 10A has a slope-shaped surface facing the substrate 100. Specifically, the first color filter pattern 311A and the second color filter pattern 312A have a slope-shaped convex surface 311As and a slope-shaped concave surface 312As facing the substrate 100, respectively.

Fig. 4 is a schematic cross-sectional view of a display device 10B according to a third embodiment of the invention. Referring to fig. 4, the display device 10B of the present embodiment is different from the display device 10 in fig. 2 in that: the color filter pattern 310B of the display device 10B has an arc-shaped surface facing the substrate 100. Specifically, the first color filter pattern 311B and the second color filter pattern 312B have an arc-shaped convex surface 311Bs and an arc-shaped concave surface 312Bs facing the substrate 100, respectively.

Fig. 5 is a schematic cross-sectional view of a display device 20 according to a fourth embodiment of the invention. Referring to fig. 5, the display device 20 of the present embodiment is different from the display device 10 of fig. 2 in that: the center thickness CT1 (or the center thickness CT2), the inner edge thickness ET1 (or the inner edge thickness ET3), and the outer edge thickness ET2 (or the outer edge thickness ET4) of the color filter pattern 310C of the display device 20 are substantially the same, and the color filter pattern 310C includes different concentrations of the blend AD in the center pixel region CR and the edge pixel region ER, respectively.

In detail, in the present embodiment, the blend AD1 of the first color filter pattern 311C in the central pixel region CR has a concentration greater than the blend AD1 of the first color filter pattern 311C in the edge pixel region ER, and the blend AD2 of the second color filter pattern 312C in the central pixel region CR has a concentration less than the blend AD2 of the second color filter pattern 312C in the edge pixel region ER.

In addition, the density of the blend AD1 of the first color filter pattern 311C in the inner edge pixel region ER1 is greater than the density of the blend AD1 of the first color filter pattern 311C in the outer edge pixel region ER2, and the density of the blend AD2 of the second color filter pattern 312C in the inner edge pixel region ER1 is less than the density of the blend AD2 of the second color filter pattern 312C in the outer edge pixel region ER 2. That is, the density of the blend AD1 of the first color filter pattern 311C decreases from the center pixel region CR toward the outer edge pixel region ER2, and the density of the blend AD2 of the second color filter pattern 312C increases from the center pixel region CR toward the outer edge pixel region ER 2.

It should be noted that, in the present embodiment, the color filter pattern 310C has different light transmittance in the central pixel region CR and the edge pixel region ER by having different concentrations of the blend AD in the central pixel region CR and the edge pixel region ER, respectively. In this embodiment, the material of the blend AD includes a dye, a pigment, or a combination thereof.

In summary, in the display device according to the embodiment of the invention, the color filter patterns have different light transmittance in the central pixel area and the edge pixel area, so that the chromaticities of the two light beams respectively generated by the corresponding light emitting structures in the central pixel area and the edge pixel area after passing through the color filter patterns are similar, thereby improving the light emitting uniformity of the pixel areas and further improving the color gamut performance of the display device.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A display device having a plurality of pixel regions, each of the pixel regions including a central pixel region and a peripheral pixel region located at a periphery of the central pixel region, the display device comprising:

a substrate;

a plurality of light-emitting structures arranged on the substrate and respectively located in the pixel regions; and

a plurality of color filter patterns disposed corresponding to the light emitting structures,

the color filter patterns comprise a first color filter pattern and a second color filter pattern, the light transmittance of the first color filter pattern in the central pixel area is smaller than that of the first color filter pattern in the edge pixel area, and the light transmittance of the second color filter pattern in the central pixel area is larger than that of the second color filter pattern in the edge pixel area.

2. The display device according to claim 1, wherein each of the light emitting structures comprises a light emitting material layer having a first thickness and a second thickness in the central pixel region and the edge pixel region, respectively, and the second thickness is greater than the first thickness.

3. The display device according to claim 1, wherein the first color filter pattern has a first thickness and a second thickness in the central pixel region and the edge pixel region, respectively, and the first thickness is greater than the second thickness, the second color filter pattern has a third thickness and a fourth thickness in the central pixel region and the edge pixel region, respectively, and the third thickness is less than the fourth thickness.

4. The display device of claim 1, wherein the edge pixel region of each pixel region comprises an inner edge pixel region and an outer edge pixel region, the inner edge pixel region is located between the outer edge pixel region and the center pixel region, and the light transmittance of the first color filter pattern in the inner edge pixel region is greater than the light transmittance of the first color filter pattern in the outer edge pixel region, and the light transmittance of the second color filter pattern in the inner edge pixel region is less than the light transmittance of the second color filter pattern in the outer edge pixel region.

5. The display device according to claim 4, wherein the first color filter pattern has a thickness that is thinner from the central pixel region toward the outer edge pixel region, and the second color filter pattern has a thickness that is thicker from the central pixel region toward the outer edge pixel region.

6. The display device according to claim 1, wherein the light emitting structures include a first light emitting structure and a second light emitting structure, the first color filter pattern and the second color filter pattern are respectively overlapped with the first light emitting structure and the second light emitting structure, and the first light emitting structure and the first color filter pattern are used for displaying red, and the second light emitting structure and the second color filter pattern are used for displaying blue or green.

7. The display device according to claim 1, wherein the difference between the light transmittance of the first color filter pattern in the central pixel region and the light transmittance of the first color filter pattern in the edge pixel region is between 15% and 30%.

8. The display device according to claim 1, wherein the light transmittance difference between the central pixel region and the edge pixel region of the second color filter pattern is between 20% and 50%.

9. The display device of claim 1, wherein the first color filter pattern comprises a first blend, and a concentration of the first blend of the first color filter pattern in the center pixel area is greater than a concentration of the first blend of the first color filter pattern in the edge pixel area, the second color filter pattern comprises a second blend, and a concentration of the second blend of the second color filter pattern in the center pixel area is less than a concentration of the second blend of the second color filter pattern in the edge pixel area.

10. The display device of claim 9, wherein the material of the first blend and the second blend comprises a dye, a pigment, or a combination of a dye and a pigment.

11. The display device according to claim 1, wherein each of the color filter patterns has a stepped surface facing the substrate.

12. The display device according to claim 1, wherein each of the color filter patterns has a slope-shaped surface facing the substrate.

13. The display device of claim 1, wherein each color filter pattern has an arc-shaped surface facing the substrate.

14. The display device according to claim 1, wherein vertical projections of the edge of the central pixel region and the edge of the edge pixel region of each pixel region on the substrate are separated by a first distance and a second distance in a first direction and a direction perpendicular to the first direction, respectively, and the first distance is greater than the second distance.