CN109962080A - display device - Google Patents

Abstract

The present invention discloses a kind of display device, including circuit base plate, multiple pixels and light shield layer.Pixel includes a plurality of light-emitting elements.Light-emitting component is configured on circuit base plate and is electrically connected with circuit base plate.A plurality of light-emitting elements in pixel are arranged along orientation.Light shield layer is located on circuit base plate and has multiple pixel openings.Pixel is located in a corresponding pixel openings.Light shield layer includes multiple the first light-shielding patterns extended along orientation and multiple second light-shielding patterns connecting with the first light-shielding pattern.The extending direction of second light-shielding pattern is different from the extending direction of the first light-shielding pattern.The thickness of first light-shielding pattern is greater than or equal to the thickness of the second light-shielding pattern.

Description

display device

technical field

The present invention relates to a display device, and more particularly, to a display device with better display quality and yield.

Background technique

Light emitting diodes (LEDs) have advantages such as long life, small size, high shock resistance, low heat generation, and low power consumption, and thus have been widely used as indicators or light sources in households and various devices. In recent years, light-emitting diodes have developed towards multi-color and high brightness, so their application fields have expanded to large outdoor signboards, traffic lights and related fields. In the future, light-emitting diodes may even become the main lighting source with both power saving and environmental protection functions.

Generally, in a display device having light emitting diodes, the light emitting diodes can be arranged on a circuit substrate through surface mount devices (SMD) technology or chip on board (COB) technology. However, in the surface mount component technology, at least one group of red, green and blue light-emitting elements is usually packaged into a bracket, and when the distance between the above-mentioned red, green or blue light-emitting elements and the pixel boundary is not At the same time, chromatic aberration will occur, resulting in lower display quality. In addition, in the direct chip packaging technology, if the original light-emitting element fails or the performance is low, because the chip of the light-emitting element is small and lacks a pick-up structure, it is difficult to perform in-situ replacement by rework. As a result, the yield of the display device is lowered. In order to improve the yield of the display device, one of the methods is to provide redundant light-emitting elements from the beginning, but it will consume too much cost. Therefore, in order to pursue higher-level image quality performance, how to further improve the yield rate and display quality of the display device without spending too much cost has become an urgent problem to be solved at present.

SUMMARY OF THE INVENTION

Embodiments of the present invention disclose a display device having better display quality and yield.

A display device according to an embodiment of the present invention includes a circuit substrate, a plurality of pixels, and a light shielding layer. The pixel includes a plurality of light-emitting elements, wherein the light-emitting elements are arranged on the circuit substrate and are electrically connected to the circuit substrate, and the plurality of light-emitting elements in the pixel are arranged along the arrangement direction. The light shielding layer is located on the circuit substrate and has a plurality of pixel openings, and the pixels are located in a corresponding one of the pixel openings. The light shielding layer includes a plurality of first light shielding patterns extending along the arrangement direction and a plurality of second light shielding patterns connected with the first light shielding patterns. The extending direction of the second light shielding pattern is different from the extending direction of the first light shielding pattern. The first shading pattern has a first thickness, the second shading pattern has a second thickness, and the first thickness is greater than or equal to the second thickness.

A display device according to an embodiment of the present invention includes a circuit substrate, a light-shielding layer, and a light-emitting element. The circuit substrate has a first surface. The light-shielding layer is located on the first surface and has a light-shielding top surface with a first thickness between the light-shielding top surface and the first surface. The light-emitting element is arranged on the first surface and has a light-emitting top surface, and there is a light-emitting height between the light-emitting top surface and the first surface. There is an element spacing between the light-emitting element and the light-shielding layer, and the element spacing is related to the first thickness and the light-emitting height. The ratio of the differences between is greater than 0.66.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

In the drawings, the dimensions of some elements or layers are exaggerated or reduced for clarity. And, the numerical value expressed in the specification may include the numerical value and the deviation value within the range of deviation acceptable to those generally skilled in the art. The above deviation value can be one or more standard deviations (StandardDeviation) in the manufacturing process or measurement process, or in the calculation or conversion process due to the number of digits used, rounding or other factors such as error propagation (ErrorPropagation) generated. Calculation error.

Description of drawings

FIG. 1A is a schematic partial top view of a display device according to the first embodiment of the present invention;

Figure 1B is a schematic cross-sectional view along the line I-I' in Figure 1A;

Figure 1C is a schematic cross-sectional view along the line II-II' in Figure 1A;

2 is a partial cross-sectional schematic diagram of a display device according to a second embodiment of the present invention;

FIG. 3 is a schematic partial top view of a display device according to a third embodiment of the present invention.

Symbol Description

100, 200, 300: Display device

110: circuit substrate

110a: first surface

111: Connection pad

111a: Connection pad maximum width

111b: first end

111c: second end

112: Conductive connectors

120: Light-emitting element

120a: Arrangement direction

120b: light-emitting top surface

120c: Component width

120d: Principal axis rays

121: The first light-emitting element

121a: first distance

122: Second light-emitting element

122a: second distance

123: Third light-emitting element

123a: Third Distance

124: Repair Lighting Components

125: Light-emitting elements that fail or have low efficacy

130, 330: shading layer

130a: pixel opening

131, 331: The first shading pattern

132, 332: Second shading pattern

140, 240: encapsulation layer

140a, 240a: Package top surface

PU, PU’, PU”: pixels

L: light

A: Component spacing

B: light output height

C: first thickness

C': second thickness

E: Package thickness

F: pixel pitch

G: Surface roughness

W: Element length

X, Y, Z: direction

Detailed ways

FIG. 1A is a schematic partial top view of a display device according to a first embodiment of the present invention. Fig. 1B is a schematic cross-sectional view along the line I-I' in Fig. 1A. Fig. 1C is a schematic cross-sectional view taken along the line II-II' in Fig. 1A. For clarity, FIG. 1A omits and illustrates some of the film layers.

Please refer to FIGS. 1A to 1C at the same time, the display device 100 of this embodiment includes a circuit substrate 110 , a plurality of pixels PU, a light shielding layer 130 and an encapsulation layer 140 . The plurality of pixels PU, the light shielding layer 130 and the encapsulation layer 140 are disposed on the first surface 110 a of the circuit substrate 110 , and the encapsulation layer 140 covers the light shielding layer 130 and the pixels PU.

The pixel PU includes a plurality of light emitting elements 120 . In this embodiment, the pixel PU may include a first light-emitting element 121 , a second light-emitting element 122 and a third light-emitting element 123 . The first light emitting element 121 , the second light emitting element 122 and the third light emitting element 123 can emit light of different colors, and the first light emitting element 121 , the second light emitting element 122 and the third light emitting element 123 are arranged along the arrangement direction 120 a. For example, the first light emitting element 121 can emit red light, the second light emitting element 122 can emit green light, the third light emitting element 123 can emit blue light, and the first light emitting element 121, the second light emitting element 122 and the third light emitting element 122 The arrangement direction 120a of the elements 123 is substantially parallel to the Y direction, but the present invention is not limited thereto.

The light emitting element 120 is disposed on the circuit substrate 110 and is electrically connected to the circuit substrate 110 . Specifically, the circuit substrate 110 may have multiple groups of connection pads 111 , and the light-emitting element 120 is configured corresponding to one of the groups of connection pads 111 . In this embodiment, the light emitting element 120 may be electrically connected to the corresponding connection pad 111 through the conductive connection member 112 in a flip chip bonding manner. The conductive connection member 112 is, for example, a solder ball, but the present invention is not limited thereto. In the present embodiment, in the arrangement direction 120a, each light-emitting element 120 has a corresponding element width 120c, each group of connection pads 111 has a corresponding maximum width 111a of the connection pad, and the aforementioned maximum width 111a of the connection pad is greater than twice the aforementioned maximum width 111a The element width is 120c. Besides, in the arrangement direction 120a, each group of connection pads 111 has opposite first ends 111b and second ends 111c, and the light emitting element 120 is disposed on one of the first ends 111b and the second ends 111c. Taking the embodiment shown in FIG. 1A as an example, the light emitting element 120 is only disposed on the first end 111 b of a corresponding set of connection pads 111 . In this way, on each set of connection pads 111 , the other end (such as the second end 111 c in the embodiment shown in 1A ) not disposed with the light-emitting element 120 can be reserved for repairing.

In this embodiment, each group of connection pads 111 may be two T-shaped conductive structures, but the present invention is not limited thereto. In other embodiments, each group of connection pads 111 may also be two strip-shaped conductive structures.

The light shielding layer 130 includes a plurality of first light shielding patterns 131 and a plurality of second light shielding patterns 132 . The first light shielding patterns 131 extend along the arrangement direction 120 a, and the extending direction of the second light shielding patterns 132 is different from the extending direction of the first light shielding patterns 131 . The first shading pattern 131 has a first thickness C, and the second shading pattern 132 has a second thickness C', and the first thickness C is greater than or equal to the second thickness C'. The first light shielding pattern 131 and the second light shielding pattern 132 are connected to form a plurality of pixel openings 130a, and the pixels PU are respectively located in the corresponding pixel openings 130a. The light shielding layer 130 can shield the light emitted by the light emitting element 120 in the pixel opening 130a. In this embodiment, the material of the light shielding layer 130 may include a light shielding solder resist material, but the present invention is not limited thereto.

In this embodiment, each pixel PU is located in a corresponding one of the pixel openings 130a, but the present invention is not limited thereto. In other embodiments, a plurality of pixels PU may be located in a corresponding pixel opening 130a. In other possible embodiments, the pixel opening 130a may not have the pixel PU, and the pixel opening 130a without the pixel PU may be used for alignment, testing or other suitable fabrication processes.

In this embodiment, the extending direction of the first light-shielding patterns 131 is different from the extending direction of the second light-shielding patterns 132 , and there are a plurality of second light-shielding patterns 132 between two adjacent first light-shielding patterns 131 . In some embodiments, the extending direction of the first light shielding pattern 131 is substantially perpendicular to the extending direction of the second light shielding pattern 132 . For example, the first light shielding pattern 131 extends substantially parallel to the Y direction, and the second light shielding pattern 132 extends substantially parallel to the X direction, but the invention is not limited thereto.

In the same pixel PU, the distances between the light emitting elements 120 and the corresponding second light shielding patterns 132 are different from each other. For example, in the same pixel PU, corresponding to the same second light-shielding pattern 132, the distance between the first light-emitting element 121 and the second light-shielding pattern 132 is the first distance 121a, and the second light-emitting element 122 and the second light-shielding pattern The distance of 132 is the second distance 122a, the distance between the third light emitting element 123 and the second light shielding pattern 132 is the third distance 123a, and the first distance 121a, the second distance 122a and the third distance 123a are different from each other. In this embodiment, the third distance 123a is greater than the second distance 122a, and the second distance 122a is greater than the first distance 121a, but the invention is not limited thereto.

Generally speaking, in two adjacent pixels PU on both sides of the second light-shielding pattern 132 , the first light-emitting element 121 , the second light-emitting element 122 and the third light-emitting element 123 may have the same arrangement. That is to say, in the above-mentioned two adjacent pixels PU, the first light-emitting elements 121 , the second light-emitting elements 122 and the third light-emitting elements 123 are all arranged along the arrangement direction 120 a. In other words, between the two light-emitting elements 120 with the same light-emitting color on both sides of the second light-shielding pattern 132, there are at least one second light-shielding pattern 132 and other two light-emitting elements 120 with different light-emitting colors. For example, between the two first light-emitting elements 121 on both sides of the second light-shielding pattern 132 , there are at least one second light-shielding pattern 132 , one second light-emitting element 122 and one third light-emitting element 123 . Or, between the two second light-emitting elements 122 on both sides of the second light-shielding pattern 132 , there are at least one second light-shielding pattern 132 , one first light-emitting element 121 and one third light-emitting element 123 . Or, between the two first light-emitting elements 121 on both sides of the third light-shielding pattern, there are at least one second light-shielding pattern 132 , one first light-emitting element 121 and one second light-emitting element 122 . Moreover, since the light-emitting height B between the light-emitting top surface 120b of each light-emitting element 120 and the first surface 110a is smaller than the second thickness C' of the second light-shielding pattern 132 . Therefore, the cross-light between two adjacent pixels PU on both sides of the second light-shielding pattern 132 can be reduced by the above-mentioned configuration manner and the height/thickness relationship. Moreover, since the second thickness C' of the second light shielding pattern 132 is less than or equal to the first thickness C of the first light shielding pattern 131, the color difference of the display device 100 in the arrangement direction 120a can also be reduced.

In the same pixel PU, the element spacing A between the light emitting elements 120 and the corresponding first light shielding patterns 131 is the same as each other. For example, in the same pixel PU, corresponding to the same first light-shielding pattern 131, the element spacing A may be the distance between the first light-emitting element 121 and the first light-shielding pattern 131, or the distance between the second light-emitting element 122 and the first light-shielding pattern 131. The distance between the first light-shielding patterns 131 , or the distance between the third light-emitting element 123 and the first light-shielding patterns 131 . Therefore, the color shift of the display device 100 in the direction perpendicular to the arrangement direction 120a (ie, the X direction) can be reduced.

The pixel pitch F formed by the center lines of the adjacent first light-shielding patterns 131 has an encapsulation thickness E between the encapsulation top surface 140 a of the encapsulation layer 140 and the first surface 110 a of the circuit substrate 110 . According to the geometric proportional relationship, when the ratio of the pixel pitch F to the difference between the package thickness E and the light-emitting height B is greater than twice the ratio of the element pitch A to the difference between the first thickness C and the light-emitting height B, The ray L (ie, the chief ray) emitted from the center normal 120d of the light-emitting surface 120b of the light-emitting element 120 cannot cross the first shading pattern 131 to reach the direction perpendicular to the arrangement direction 120a (ie, the X direction). ) on either side, thereby achieving the effect of reducing cross-light, which is represented by the following equation (1-1):

In this way, the phenomenon of cross-light generated between two adjacent pixels PU on both sides of the first light shielding pattern 131 can be reduced.

Taking a micro light emitting diode (micro LED; μLED) as the light emitting element 120 as an example, the element length W of the light emitting element 120 perpendicular to the arrangement direction 120a may be at least 5 micrometers (micrometer; μm). In addition, the pixel pitch F formed by the center lines of the adjacent first light-shielding patterns 131 may be at most 2000 microns. Also, the first thickness C of the first light shielding pattern 131 may be at least 10.1 microns. Also, the light-emitting height B of the light-emitting element 120 may be at most 10 microns. Under the aforementioned relative dimensions, the ratio of the element spacing A to the difference between the first thickness C and the light exit height B can be less than 5000 through the proportional relationship of similar triangles, that is, the following equation (1-2) To represent:

In addition, generally speaking, the material of the encapsulation layer 140 is selected from, for example, one of epoxy resins, silicone resins and compounds thereof, and the Refractive Index of the encapsulation layer 140 is between 1.4 to 1.8. The main axis light L of the light emitting element 120 is partially trapped in the encapsulation layer 140 by total reflection. In order to prevent the main axis light L from being further blocked by the first shading pattern 131, Snell's Law is used. ), the ratio of the element spacing A to the difference between the first thickness C and the light exit height B can be greater than 0.66, which is represented by the following equation (2):

Besides, under the above conditions, the encapsulation thickness E of the encapsulation layer 140 may be less than or equal to 1506.61 μm, so as to reduce the possibility of cross-light generation between two adjacent light-emitting elements 120 on both sides of the first light-shielding pattern 131 . .

In this embodiment, some of the pixels PU (eg, pixel PU') may further include a repair light-emitting element 124, and the repair light-emitting element 124 and the light-emitting element 125 disposed on the same set of connection pads 111 have the same light-emitting color, Moreover, the position of the aforementioned repairing light-emitting element 124 is different from that of the aforementioned light-emitting element 125 . For example, in the pixel PU′, on the same set of connection pads 111 , the aforementioned light-emitting element 125 is arranged at the first end 111 b of the connection pad 111 , and the aforementioned repair light-emitting element 124 is arranged at the first end 111 b of the connection pad 111 . Two ends 111c. During the manufacturing process of the display device 100 , the repairing light-emitting element 124 for repairing can be directly disposed on the second connection pad 111 in the same or similar manner as the light-emitting element 125 when the light-emitting element 125 fails or has low performance. end 111c. In this way, the display device 100 can have better yield through rework.

It is worth noting that, in the embodiment shown in FIG. 1A , the number of pixels PU′, PU″ having the repair light-emitting elements 124 is two, and the number of the repairing light-emitting elements 124 is two, for example , but the present invention is not limited to the number of pixels with repaired light-emitting elements 124 and the number of repaired light-emitting elements 124. Also, in some embodiments, failed or low-efficiency light-emitting elements may be removed (eg, FIG. 1A ). , compared with the second light-emitting element 122 in the other pixels PU, the pixel PU" in the lower rightmost corner of the paper does not have a similar second light-emitting element 122, but has a repair light-emitting element 124) to reduce failure or performance A lowered light-emitting element may cause further damage.

The configuration of the repaired light-emitting element 124 is similar to that of the light-emitting element 125 on the same set of connection pads 111 . That is to say, the repaired light-emitting element 124 and the other plurality of light-emitting elements 120 in the pixels PU′, PU″ are arranged along the arrangement direction 120 a. In addition, compared with the distance between the other light-emitting elements 120 and the first shading pattern 131 (ie, element pitch A), the distance between the repaired light emitting elements 124 and the first light shielding pattern 131 (ie, element pitch A) is substantially the same as the aforementioned distance (ie, element pitch A).

FIG. 2 is a partial cross-sectional schematic diagram of a display device according to a second embodiment of the present invention. It must be noted here that the embodiment of FIG. 2 uses the element numbers and part of the content of the embodiment of FIG. 1A to FIG. 1C , wherein the same or similar numbers are used to represent the same or similar elements, and the same technical content is omitted. It is noted that for the description of the omitted part, reference may be made to the foregoing embodiments, and repeated descriptions in the following embodiments will not be repeated.

Please also refer to FIG. 2 , the display device 200 of this embodiment is similar to the display device 100 of the embodiment of FIGS. 1A to 1C , the difference between the two is that the package top surface 240 a of the package layer 240 is a rough surface. In the normal direction (ie, Z direction) of the first surface 110a, the distance between the highest point and the lowest point of the package top surface 240a is the surface roughness G, and the package thickness E of the package layer 240 is greater than ten times the surface Roughness G. In this way, the haze of the display device 200 can be reduced, and thus the display quality of the display device 200 can be improved.

Generally speaking, a rough surface can be used to reduce the total reflection to increase the light extraction efficiency. However, an excessively rough surface will result in disordered luminance distribution, resulting in a broken image on the device at certain viewing angles. haze. In the present embodiment, the encapsulation thickness E of the encapsulation layer 240 can be greater than ten times the surface roughness G to reduce total reflection and increase light extraction efficiency, and the display device 200 can have good display quality.

FIG. 3 is a schematic partial top view of a display device according to a third embodiment of the present invention. It must be noted here that the embodiment of FIG. 3 uses the element numbers and part of the content of the embodiment of FIG. 1A to FIG. 1C , wherein the same or similar numbers are used to represent the same or similar elements, and the same technical content is omitted. It is noted that for the description of the omitted part, reference may be made to the foregoing embodiments, and repeated descriptions in the following embodiments will not be repeated.

Please also refer to FIG. 3 , the display device 300 of this embodiment is similar to the display device 100 of the embodiment of FIGS. 1A to 1C , and the difference between the two is: the extension direction of the first light-shielding pattern 331 and the extension of the second light-shielding pattern 332 The directions are different, and there are a plurality of first light-shielding patterns 331 between two adjacent second light-shielding patterns 332 . In some embodiments, the extending direction of the first light shielding pattern 331 is substantially perpendicular to the extending direction of the second light shielding pattern 332 . For example, the first light shielding pattern 331 extends substantially parallel to the Y direction, and the second light shielding pattern 332 extends substantially parallel to the X direction.

To sum up, in the plurality of pixels of the display device of the present invention, the plurality of light-emitting elements of each pixel are arranged along the arrangement direction, the first light-shielding pattern extends along the arrangement direction, and the extension direction of the second light-shielding pattern is the same as that of the first light-shielding pattern. The extending directions of the light-shielding patterns are different, and the thickness of the first light-shielding pattern is greater than or equal to the thickness of the second light-shielding pattern. In this way, in the direction perpendicular to the arrangement direction, the light extraction efficiency and the viewing angle of the display device can be increased. Also, in the arrangement direction, the chromatic aberration of the display device can be reduced. In addition, cross-light between pixels can also be reduced by the arrangement of the first light shielding pattern and/or the second light shielding pattern. Therefore, the display device has better display quality.

Although the present invention is disclosed in conjunction with the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The scope of protection of the present invention should be defined by the appended claims.

Claims (20)

1. A display device, characterized in that, comprising: circuit substrate; A plurality of pixels, respectively including a plurality of light-emitting elements, wherein the plurality of light-emitting elements are arranged on the circuit substrate and are electrically connected to the circuit substrate, and the plurality of light-emitting elements in the plurality of pixels are along the Arrangement direction arrangement; and A light shielding layer is located on the circuit substrate and has a plurality of pixel openings, wherein the plurality of pixels are located in one of the plurality of pixel openings, and the light shielding layer includes a plurality of first pixels extending along the arrangement direction. a light-shielding pattern and a plurality of second light-shielding patterns connected to the plurality of first light-shielding patterns, and the extending direction of the plurality of second light-shielding patterns is different from the extending direction of the plurality of first light-shielding patterns, the Each of the plurality of first light-shielding patterns has a first thickness, and each of the plurality of second light-shielding patterns has a second thickness, and the first thickness is greater than or equal to the second thickness. 2. The display device according to claim 1, wherein the circuit substrate has a plurality of groups of connection pads, and the plurality of light emitting elements are arranged corresponding to one of the plurality of groups of connection pads, wherein in the arrangement direction , each of the plurality of light-emitting elements has an element width, each of the plurality of groups of connection pads has a maximum width of the connection pad, and the maximum width of the connection pad is greater than twice the width of the element. 3. The display device of claim 2, wherein one of the plurality of pixels further comprises: At least one repair light-emitting element is configured corresponding to one of the plurality of groups of connection pads, wherein the at least one repair light-emitting element and one of the plurality of light-emitting elements disposed on the same plurality of groups of connection pads have the same glow color. 4 . The display device of claim 3 , wherein the at least one repair light-emitting element and one of the plurality of light-emitting elements and the corresponding plurality of first light-emitting elements are disposed on the same plurality of groups of connection pads. 5 . A light-shielding pattern has the same spacing. 5 . The display device of claim 1 , wherein a plurality of the second light shielding patterns are disposed between the adjacent first light shielding patterns. 6 . 6 . The display device of claim 1 , wherein a plurality of the plurality of first light shielding patterns are disposed between the adjacent plurality of second light shielding patterns. 7 . 7 . The display device of claim 1 , wherein the circuit substrate has a first surface, the plurality of light-emitting elements have a light-emitting top surface, and a light-emitting height is formed between the light-emitting top surface and the first surface. 8 . , and the first thickness and the second thickness are greater than the light-emitting height. 8 . The display device of claim 7 , wherein an element spacing is provided between the plurality of light emitting elements and the corresponding plurality of first light-shielding patterns, and the element spacing is proportional to the first thickness and the The ratio of the difference between the light exit heights is greater than 0.66. 9 . The display device of claim 8 , wherein a ratio of the element spacing to the difference between the first thickness and the light exit height is less than 5000. 10 . 10. The display device of claim 1, wherein the circuit substrate has a first surface, and the display device further comprises: an encapsulation layer covering the light-shielding layer and the plurality of light-emitting elements, the encapsulation layer has a package top surface, and a package thickness between the package top surface and the first surface, wherein the package thickness greater than the first thickness. 11 . The display device of claim 10 , wherein the plurality of light-emitting elements have a light-emitting top surface, and a light-emitting height is formed between the light-emitting top surface and the first surface, and the adjacent first plurality of first surfaces have a light-emitting height. 12 . There is a pixel pitch between the light-shielding patterns, and there is an element pitch between the plurality of light-emitting elements and the corresponding first light-shielding patterns, and the pixel pitch is related to the difference between the package thickness and the light-emitting height. The ratio of values is greater than twice the ratio of the element pitch to the difference between the first thickness and the light exit height. 12. The display device of claim 10, wherein the package top surface of the package layer has a surface roughness, and the package thickness is greater than ten times the surface roughness. 13. The display device of claim 1, wherein distances between the plurality of light emitting elements and the corresponding second light shielding patterns are different from each other. 14. The display device of claim 1, wherein the material of the light shielding layer comprises a solder resist material. 15. A display device, comprising: a circuit substrate having a first surface; a light-shielding layer on the first surface and having a light-shielding top surface with a first thickness between the light-shielding top surface and the first surface; and A light-emitting element, which is disposed on the first surface and has a light-emitting top surface, and a light-emitting height between the light-emitting top surface and the first surface, and an element spacing between the light-emitting element and the light shielding layer , and the ratio of the element spacing to the difference between the first thickness and the light exit height is greater than 0.66. 16. The display device of claim 15, wherein the first thickness is greater than the light exit height. 17 . The display device of claim 15 , wherein a ratio of the element spacing to the difference between the first thickness and the light exit height is less than 5000. 18 . 18. The display device of claim 15, further comprising: an encapsulation layer covering the light-shielding layer and the plurality of light-emitting elements, the encapsulation layer has a package top surface, and a package thickness between the package top surface and the first surface, wherein the package thickness greater than the first thickness. 19. The display device of claim 18, wherein the light shielding layers on opposite sides of the light emitting element have a pixel pitch, wherein the pixel pitch is a difference between the package thickness and the light exit height The ratio of is greater than twice the ratio of the element pitch to the difference between the first thickness and the light exit height. 20. The display device of claim 18, wherein the package top surface of the package layer has a surface roughness, and the package thickness is greater than ten times the surface roughness.