CN110400829B

CN110400829B - Display panel

Info

Publication number: CN110400829B
Application number: CN201910740719.1A
Authority: CN
Inventors: 刘家兴; 赖炎晖
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2019-01-25
Filing date: 2019-08-12
Publication date: 2021-10-22
Anticipated expiration: 2039-08-12
Also published as: TWI692744B; TW202029149A; CN110400829A

Abstract

The invention provides a display panel, comprising: a substrate; a display pixel layer disposed on the substrate; and the light transmitting layer is arranged on one side of the display pixel layer, which is back to the substrate. The display pixel layer comprises a preset target point, and the euphotic layer is provided with a compensation structure corresponding to the preset target point. Wherein the compensation structure comprises an interface extending towards a predetermined target point.

Description

Display panel

Technical Field

The present invention relates to a display panel. In particular, the present invention relates to a display panel having a compensation structure to correspond to a predetermined target point.

Background

In the process of manufacturing a display panel, defective spots may be generated in the display panel due to metal deposition, contamination with foreign matter, or operation error. These defect points may degrade the display quality and may cause the display panel to be rejected as being out of normal use. Accordingly, in order to improve the display quality, increase the production yield of the display panel and reduce the loss caused by the failure of the display panel, many techniques have been developed to repair the defect points. However, some defective dots cannot be repaired, and some defective dots can be repaired only to defective dots that are less affected. Therefore, there is still a need to develop a technology for improving the quality and display effect of the display panel having the defective dot.

Disclosure of Invention

To solve the above problems, an embodiment of the present invention provides a display panel, including: a substrate; the display pixel layer is arranged on the substrate and comprises a preset target point; and the light transmitting layer is arranged on one side of the display pixel layer, which is back to the substrate. The light-transmitting layer is provided with a compensation structure corresponding to a preset target point. Wherein the compensation structure comprises an interface extending towards a predetermined target point.

According to the display panel provided by the embodiments of the invention, the light can be guided by the compensation structure, so that the predetermined target point (for example, a defect point which is disabled or abnormally displayed) is difficult to perceive or perceive. Therefore, according to the embodiments of the present invention, the yield and the display quality of the display panel having the predetermined target point can be improved.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

Drawings

Fig. 1A is a schematic cross-sectional view of a display panel according to an embodiment of the invention.

Fig. 1B and 1C are schematic perspective oblique views of display panels according to embodiments of the invention.

Fig. 2A and 2B are enlarged schematic views of a compensation structure of a display panel according to an embodiment of the invention.

Fig. 3A to 3C are schematic diagrams of compensation structures according to different embodiments of the present invention.

Fig. 4A to 4C are schematic diagrams of compensation structures according to different embodiments of the present invention.

Fig. 5 is a schematic view illustrating a transparent layer disposed and cut by a laser according to an embodiment of the invention.

Fig. 6A to 6F are schematic views of compensation structures formed by cutting according to different embodiments of the present invention.

Wherein the reference numerals

1000. 2000: display panel

15: presetting target point

21. 22, 23, 24: region(s)

25: compensation structure

35: interface (I)

41. 42, 43, 44, 45, 46, 47: concave part

50: light-transmitting layer

51. 52, 53, 55, 56, 57: compensation structure

61. 62, 63, 64, 65, 66: concave part

100: substrate

150: polyimide layer

200. 200': display pixel layer

210: pixel

300: thin film encapsulation layer

400: structural layer

500: light-transmitting layer

510. 520, 530, 540, 550, 560: compensation structure

800: laser

N1, N2: refractive index

γ、γ’、α2、α3、α4、θ₂、θ₃、θ₄: angle of rotation

L1, L1 ', L2, L2', L3, L3 ', L4, L4': path of light

b: bottom end

W, D, d: width of

W1, W2: maximum width

T1: top surface extension line

Detailed Description

The following detailed description of the embodiments of the present invention with reference to the drawings and specific examples is provided for further understanding the objects, aspects and effects of the present invention, but not for limiting the scope of the appended claims.

Various embodiments will be described hereinafter, and the spirit and principles of the invention should be readily understood by those skilled in the art with reference to the description taken in conjunction with the drawings. However, while certain specific embodiments are specifically illustrated herein, these embodiments are merely exemplary and are not to be considered in all respects as limiting or exhaustive. Accordingly, various changes and modifications to the invention will be apparent to those skilled in the art without departing from the spirit and principles of the invention.

In the drawings, the thickness of layers, films, substrates, regions, etc. are exaggerated for clarity. Like reference numerals refer to like elements throughout the specification. It will be understood that when an element such as a layer, film, substrate, or region 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, an "electrical connection" or "coupling" may be the presence of other elements between the two elements.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a "first element," "first component," "first region," "first layer" or "first portion" discussed below could also be termed a second element, second component, second region, second layer or second portion without departing from the teachings herein.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms, including "at least one", unless the content clearly indicates otherwise. "or" means "and/or". As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence or addition of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.

Exemplary embodiments are described herein with reference to cross-sectional views that are schematic illustrations of idealized embodiments. Thus, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, the embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, a region shown or described as flat may generally have rough and/or nonlinear features. Further, the acute angles shown may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the claims.

Referring to fig. 1A, according to an embodiment of the invention, the display panel 1000 includes a substrate 100, a display pixel layer 200 disposed on the substrate 100, and a light-transmitting layer 50 disposed on a side of the display pixel layer 200 opposite to the substrate 100. The display pixel layer 200 may be configured to display in a direction away from the substrate 100, and may be formed by arranging various pixel or sub-pixel configurations for displaying. In a preferred embodiment, the pixel or the sub-pixel may be a self-emitting pixel, for example, formed by an organic light emitting diode and a control circuit. However, in different embodiments, the pixels or sub-pixels may also be formed by light modulation materials such as liquid crystal molecules, etc. in combination with pixel electrodes and signal circuits. In addition, the light-transmitting layer 50 may be any layer that may have optical transparency, and may have a specific function or no specific function. For example, the light-transmitting layer 50 may be made of an optically transparent material and functions as a cover plate or a polarizer of the display panel 1000. However, this is merely an example, and the transparent layer 50 may be any structure layer disposed on the display pixel layer 200 and having optical transparency or made of an optically transparent material. Accordingly, light rays for display through the display pixel layer 200 (e.g., light rays emitted from the display pixel layer 200 or emitted from a backlight and then passing through the display pixel layer 200) may exit through the light transmissive layer 50 back to the substrate 100.

In the display panel 1000, the display pixel layer 200 has at least one predetermined target point 15. For example, the at least one predetermined target point 15 may be a defect point in the display panel 1000 due to various possible factors such as metal deposition, contamination of foreign materials, short circuit, abnormal material lines, or operation errors. Specifically, the preset target point 15 may be any predetermined point or defect point where the display pixel layer 200 cannot normally display, abnormally display, or be hidden by a contaminant, or the like. For example, the predetermined target point 15 may be a bright point, a dark point, a bright line, a dark line, a blinking point, or other points that cannot be displayed as expected. Alternatively, the predetermined target point 15 may be any point that, although repaired, is not fully restored. For example, since the human eye is sensitive to bright spots, the predetermined target point 15 may be a point where the abnormal bright spot is repaired to a dark spot which is difficult to be recognized by the human eye. In addition, the predetermined target point 15 may be a pixel or a sub-pixel that loses function, or may be a pixel or a sub-pixel that is short-circuited and abnormally displays light. When the display pixel layer 200 includes a liquid crystal display pixel layer, the predetermined target point 15 may also be a distribution point of degradation or contamination of liquid crystal molecules. However, the above are only examples, and the invention is not limited thereto, and the predetermined target 15 may be a defect-free site. For example, any location that is not defective but is not expected to be perceived or perceived by the user may be used.

According to the embodiment of the invention, in order to compensate or mask the predetermined target 15, the transparent layer 50 disposed on the display pixel layer 200 may have a compensation structure 25 corresponding to the predetermined target 15. Wherein the compensation structure 25 comprises an interface 35 extending towards the predetermined target point 15. For example, according to the embodiment of the invention, the interface 35 obliquely extends from the top surface of the light-transmitting layer 50 away from the substrate 100 to the bottom surface of the light-transmitting layer 50 close to the substrate 100. That is, interface 35 may extend through the entire thickness of transparent layer 50. However, the present invention is not limited thereto, and the interface 35 may extend only a portion in the thickness direction of the light-transmitting layer 50.

For example, according to some embodiments of the present invention, when the predetermined target point 15 is a point-like point, referring to fig. 1B, the compensation structure 25 may be formed as a conical funnel-shaped recess, and the single annular curved sidewall of the recess corresponds to the interface 35. In this case, fig. 1A may be a cross-sectional view of the display panel 1000 taken along a section line a-a' of fig. 1B. In addition, according to another embodiment of the present invention, when the predetermined target 15 is a long-bar point, referring to fig. 1C, the compensation structure 25 can be formed as a V-groove-shaped recess, and both sidewalls of the recess correspond to the interfaces 35. In this case, fig. 1A may be a cross-sectional view of the display panel 1000 taken along a section line B-B' of fig. 1C. However, the above are examples only, and other embodiments of the present invention may be taken from the cross-sectional view shown in fig. 1A.

As described above, referring to fig. 1A to 1C, with the compensation structure 25, the light emitted through the predetermined target 15 (the light directly emitted from the predetermined target 15 or the light emitted from the backlight and then passing through the predetermined target 15) may be difficult or impossible to be emitted out of the display panel 1000. Alternatively, light emitted from adjacent normal display regions (light directly emitted from the regions or light emitted from the backlight and then passing through the regions) may be guided to above the predetermined target point 15 and emitted out of the display panel 1000. Further, according to some embodiments of the present invention, the two may also occur simultaneously. Therefore, according to various embodiments of the present invention, the chance of the preset target point 15 being sensed or perceived can be reduced or avoided, and will be described in detail below.

In the following, a state in which the predetermined target point 15 is compensated will be described with reference to fig. 2A and fig. 2B in conjunction with fig. 1A, wherein fig. 2A and fig. 2B show an enlarged schematic view of a portion of the compensation structure 25 of fig. 1A.

As described above, according to an embodiment of the present invention, when the display panel 1000 having the compensation structure 25 corresponding to the predetermined target 15 is used, the light passing through the predetermined target 15 may exit through different paths, but is more difficult to exit or exit outside the display panel 1000 due to the guidance of the compensation structure 25. In addition, the light rays displayed in the normal regions (e.g., the

regions

21, 22, 23, and 24) of the display pixel layer 200 adjacent to the predetermined target point 15 can be guided to the vicinity above the predetermined target point 15 and exit, so as to be perceived by the naked eye to mask the existence of the predetermined target point 15. For example, the regions 21 to 24 may be pixels for normal display, but the invention is not limited thereto, and the regions 21 to 24 may be regions which are expected to be sensed or perceived outside any predetermined target point 15. In addition, the blocks of the regions 21-24 shown in the drawings are only schematic representations of a portion of a region, and do not necessarily represent the extent or boundaries of any particular structural block. Accordingly, based on the arrangement of the compensation structure 25, when the display panel 1000 is viewed, the chance of the preset target point 15 being perceived or sensed by the user can be reduced.

Specifically, according to this embodiment of the present invention, in the display panel 1000, the interface 35 of the compensation structure 25 and the top surface extension line T1 of the light transmissive layer 50 define the recess 44 filled with air or any medium in the light transmissive layer 50. For example, the recess 44 may be a region or a block that is recessed in the transparent layer 50 to be separated from the transparent layer 50 and is made of a medium different from the material of the transparent layer 50. In this case, the interface 35 of the compensation structure 25 is a separation interface of the recess 44 and the transparent layer 50. In summary, in some instances, the recess 44 may not be filled with other media but with air, and in some instances may be filled with media other than air. The refractive index of the medium filled in the recess 44 may be N1 (e.g., 1 in the case of air filling), the refractive index of the light-transmitting layer 50 may be N2, and according to various embodiments of the present invention, the refractive index N2 is greater than the refractive index N1.

With continued reference to fig. 2A and 2B, the interface 35 has a bottom end B that is closest or relatively closer to the display pixel layer 200. For example, as shown in FIG. 1B, the bottom end B may be the point where the interface 35 extends down toward the collection focus of the display pixel layer 200. For another example, as shown in fig. 1C, the bottom end b may be a point where the two side interfaces 35 extend downward toward the intersection of the display pixel layer 200. In some embodiments, the extension lines from the points where the two side interfaces 35 of the V-groove meet as shown in fig. 1C may not be at the same level. Thus, the bottom end b may be the location or area intersected or concentrated by the interface 35 to be closest or relatively closer to the display pixel layer 200. In addition, without the intersection or convergence of the interface 35, according to other embodiments of the present invention, the bottom b may be a point or a region where the recess 44 is closest or relatively close to the display pixel layer 200 (e.g., the recess 44 is similar to an inverted truncated cone, and the bottom b is a plane where the truncated cone is relatively close to the display pixel layer 200).

Accordingly, the orthographic projection of the bottom end b on the display pixel layer 200 corresponds to the predetermined target point 15. For example, in a preferred embodiment, the bottom end b falls within the range corresponding to the predetermined target point 15 when projected on the display pixel layer 200 perpendicular to the surface of the display pixel layer 200.

When the emergent light beam passes through the transparent layer 50, which is displayed abnormally or incapacitated by the predetermined target point 15, the light beam may reach the interface 35 along different light paths. As mentioned above, referring to fig. 2A, since the bottom end b of the interface 35 (also the bottom end b of the recess 44) substantially corresponds to the predetermined target point 15, a small portion of the light emitted through the predetermined target point 15 may directly exit to the bottom end b along the light path L1. In this case, since the incident angle is 0 and the refractive index N1 of the medium filled in the recess 44 is smaller than the refractive index of the display pixel layer 200 or the refractive index N2 of the light-transmissive layer 50 (depending on whether the light passes through the display pixel layer 200 based on the position of light emission and whether the light passes through the light-transmissive layer 50 based on the position of the bottom end b in the light-transmissive layer 50), the light may be partially reflected directly along the light path L1'. Therefore, the light emitted from the light path L1 to the outside of the display panel 1000 is reduced.

In addition, the light emitted through the predetermined target point 15 may reach the interface 35 along the light path L2. In this case, since the interface 35 extends (e.g., obliquely extends) toward the predetermined target point 15 and the refractive index N1 of the medium filled in the recess 44 is smaller than the refractive index N2 of the light-transmissive layer 50, the light reaches the interface 35 in a direction close to parallel or at a small angle with respect to the interface 35. That is, the light ray is incident on the interface 35 at a larger incident angle α (the angle α 2 shown in fig. 2A) relative to the normal of the interface 35. According to Snell's Law, the light is incident on the interface 35 via the compensation structure 25 at an incident angle α (e.g., angle α 2 shown in FIG. 2A) and possibly at a refraction angle θ (e.g., angle θ shown in FIG. 2A)₂) The light emitted to the recess 44 should satisfy the following relation (where N1 and N2 are defined as the refractive index of the medium filled in the recess 44 and the refractive index of the transparent layer 50, respectively):

relation 1: n1 x sin θ ═ N2 x sin α

Based on the above relation 1, since the refractive index N2 is greater than the refractive index N1 and the interface 35 extends toward the predetermined target point 15 (e.g., extends obliquely), most of the light rays exiting through the predetermined target point 15 will be difficult to exit from the compensation structure 25 due to the too large incident angle α, or will be guided to exit along the extending direction of the interface 35. For example, referring to fig. 2A, the light incident on the interface 35 at the incident angle α 2 based on the light path L2 may be totally reflected along the light path L2'. That is, based on the relation 1, once the incident angle α is greater than a predetermined first angle such that the refraction angle θ is greater than 90 degrees, the light is totally reflected on the interface 35.

According to some embodiments of the present invention, in order to reduce the chance that the light passing through the predetermined target point 15 is not expected to exit from the display panel 1000, if the display panel 1000 is cut along the thickness direction thereof, the maximum width W1 of the recess 44 parallel to the surface of the display pixel layer 200 may be as wide as the maximum width W2 of the predetermined target point 15 parallel to the surface of the display pixel layer 200, or the maximum width W1 of the recess 44 parallel to the surface of the display pixel layer 200 may be greater than the maximum width W2 of the predetermined target point 15 parallel to the surface of the display pixel layer 200. Therefore, most of the light beams emitted through the predetermined target point 15 can be guided by the interface 35, so as to reduce or avoid the chance of emitting light out of the recess 44 or the display panel 1000. However, the present invention is not limited thereto.

Referring to fig. 2B, light rays exiting from at least a portion of the normal regions (e.g.,

regions

21, 22, 23, 24) of the display pixel layer 200 except the predetermined target point 15 may be incident on the interface 35 at a smaller incident angle α. For example, as shown in FIG. 2B, light exiting through region 22 may exit along light path L3 and strike interface 35 at a smaller angle of incidence α 3, thereby refracting at an angle of refraction θ₃Refracted by angle theta₃Less than 90 degrees and still exits the display panel 1000 along the light path L3'. Similarly, the light exiting through the region 24 may also exit along the light path L4 and strike the interface 35 at a smaller incident angle α 4, thereby having an angle of refraction θ₄Refracted by angle theta₄Less than 90 degrees and still exits the display panel 1000 along the light path L4'. Accordingly, at least a portion of the light projected vertically in the compensation structure 25 and/or outside the compensation structure 25 in the normal area can be guided to the vicinity above the predetermined target point 15, so as to compensate or obscure the predetermined target point 15.

The light emitted through the light path L3 'or the light path L4' is guided to the area above or near the predetermined target point 15 and emitted corresponding to the predetermined target point 15. Therefore, the display panel 1000 according to the embodiment of the invention can cover or disguise the preset target 15 by the emergent light of other normal regions, thereby reducing the possibility that the preset target 15 is sensed or perceived. Accordingly, the display quality of the display panel 1000 having the predetermined target point 15 can be further improved.

Further, according to the embodiment of the present invention, it is expected that most or all of the light beams emitted through the predetermined target point 15 will be totally reflected and not emitted when reaching the interface 35, and at least a portion of the light beams emitted through the normal area outside the predetermined target point 15 can be smoothly guided to the predetermined target point 15 when reaching the interface 35. Therefore, based on the required conditions of total reflection, it is preferable that the incident angle α of the light emitted through the predetermined target point 15 is greater than the predetermined first angle, and the incident angle α of the light emitted through at least one normal region outside the predetermined target point 15 is less than the predetermined first angle. That is, the first angle is the critical angle of total reflection of the interface 35. In summary, according to a preferred embodiment of the present invention, the angle γ between the horizontal plane tangent to the bottom end b or the bottom region and parallel to the surface of the display pixel layer 200 and the interface 35 along the thickness direction cross section of the transparent layer 50 can be smaller than the first angle to achieve the above objective. According to the above relation 1, the refractive index N1 of the medium filled in the first angle and the concave portion 44 and the refractive index N2 of the light-transmitting layer 50 satisfy the following relation 2:

relation 2: n1 x sin 90 ° ═ N2 x sin (first angle)

That is, the maximum value of the included angle γ, the included angle γ', the refractive index N1 of the medium filled in the recess 44, and the refractive index N2 of the light-transmissive layer 50 satisfy the following relations:

relation 3: sin gamma-N1/N2

Configured according to the above principles, the compensation structure 25 can more easily guide the light exiting through the predetermined target point 15 to be totally reflected or leave the upper portion of the predetermined target point 15. Meanwhile, the light emitted through other normal regions can be further guided to the predetermined target point 15 to compensate or mask the predetermined target point 15.

Hereinafter, aspects of the compensation structure formed according to various embodiments of the present invention and a manner of fabricating the same will be described with further reference to fig. 3A to 3C.

As described above, according to various embodiments of the present invention, the interface 35 of the compensation structure may define a recess, and a cross-sectional area of the recess parallel to the surface of the display pixel layer 200 is gradually reduced in a direction toward the display pixel layer 200. For example, the recess may be substantially funnel-shaped. Alternatively, the recess may be formed substantially as a linear groove. That is, the interface 35 may also define a linear groove extending in the transparent layer 50 to correspond to a defect line (e.g., a dark line) formed by the predetermined target points or the predetermined target points arranged in a row.

In detail, when the display panel is manufactured and the predetermined target point 15 is detected and found, a laser may be used to cut any one of the transparent layers 50 existing on the display pixel layer 200 corresponding to the predetermined target point 15. For example, the cutting may be performed using a laser on a cover plate or a polarizer of the display panel 1000 made of polyethylene terephthalate (PET).

For example, according to an embodiment of the present invention, similar to the compensation structure 25 described above with reference to fig. 1A to 2B, the light-transmitting layer 50 may be cut by emitting laser light with high energy for many times. In this aspect, the Heat Affected Zone (HAZ) range of the laser cutting is large, and the depth and slope are large, and thus the compensation structure 51 having the reverse tapered recess 41 in the cross section as shown in fig. 3A can be formed.

Next, according to another embodiment of the present invention, referring to fig. 3B, the light-transmitting layer 50 may be cut by emitting laser light at low energy and low times. In this aspect, the heat affected zone of the laser cut is smaller in area and smaller in depth and slope, and thus the compensation structure 52 having the recess 42 with rounded corners in the cross-section shown in fig. 3B can be formed. The pattern shown in fig. 3B may be a dot-like structure similar to that shown in fig. 1B or a linear structure similar to that shown in fig. 1C, and the invention is not limited thereto.

In addition, according to still another embodiment of the present invention, referring to fig. 3C, the light-transmitting layer 50 may be cut by emitting laser light at low energy a plurality of times. In this aspect, the heat affected zone area of the laser cutting is small, but the depth and slope are large, and thus the compensation structure 53 having the recess 43 with an inverted trapezoid shape in cross section as shown in fig. 3C can be formed. The pattern shown in fig. 3C may be a dot-like structure similar to that shown in fig. 1B or a linear structure similar to that shown in fig. 1C, and the invention is not limited thereto.

In any of the above embodiments, the width W of the

compensation structure

51, 52 or 53 in this cross section may be the maximum width of the

recess

41, 42 or 43. Accordingly, since the

recess

41, 42 or 43 should preferably correspond to or be aligned with the predetermined target 15, the width W of the

compensation structure

51, 52 or 53 is preferably greater than or equal to the width of the predetermined target 15. However, the present invention is not limited to the specific embodiments described herein, as the light can be guided to compensate or mask the predetermined target point 15 by the above principle.

Further, according to some embodiments of the present invention, referring to fig. 4A to 4C, the compensation structure of the protruding pattern may also be cut by laser. For example, according to an embodiment of the present invention, referring to fig. 4A, at least a portion of the transparent layer 50 except for the thinned compensation structure 55 may be removed by laser cutting or other methods, and the portion of the transparent layer 50 corresponding to the compensation structure 55 that is expected to be generated may be cut by emitting laser light with high energy for a plurality of times, so as to form the compensation structure 55 (particularly, the portion of the recess 45). In this aspect, the heat affected zone of the laser dicing is wide, and the depth and slope are also large, so that the compensation structures 55 having the recesses 45 arranged in a pyramid shape as shown in fig. 4A can be formed.

Next, according to still other embodiments of the present invention, referring to fig. 4B, at least a portion of the transparent layer 50 except for the thinned compensation structure 56 may be removed by laser cutting or other methods, and the laser may be emitted at low energy and low times to cut a portion of the transparent layer 50 corresponding to the compensation structure 56, so as to form the compensation structure 56 (particularly, the portion of the recess 46). In this aspect, the heat affected zone of the laser cutting is small, and the depth and slope are also small, so that the compensation structure 56 with rounded bullet-shaped cones side by side and the recess 46 can be formed as shown in fig. 4B.

In addition, according to still other embodiments of the present invention, referring to fig. 4C, at least a portion of the light-transmitting layer 50 except for the thinned compensation structure 57 may be removed by laser cutting or other methods, and the portion of the light-transmitting layer 50 corresponding to the compensation structure 57 that is expected to be generated may be cut by emitting laser light with low energy and many times, so as to form the compensation structure 57 (particularly, the portion of the recess 47). In this aspect, the heat affected zone of the laser cut is smaller, but the depth and slope are larger, so that a compensation structure 57 with truncated conical juxtaposition and a recess 47 can be formed as shown in FIG. 4C.

4A-4C, the width D of the compensating

structure

55, 56, or 57 is greater than the maximum width D of the

recess

45, 46, or 47. In view of the above, since the

recess

45, 46, or 47 should preferably correspond to or be aligned with the predetermined target 15, it is preferable that the width D of the

compensation structure

55, 56, or 57 or the maximum width D of the

recess

45, 46, or 47 is greater than the width of the predetermined target 15. In addition, in some embodiments, the maximum width d of the

recess

45, 46, or 47 may be as wide as the width of the preset target point 15. However, the present invention is not limited to the specific embodiments described herein, as the light can be guided to compensate or mask the predetermined target point 15 by the above principle.

According to the embodiments, after the predetermined target 15 is found or set, the compensation structure is directly formed on the transparent layer 50 (e.g., a polarizer or a cover plate) of the display panel 1000 by cutting the transparent layer 50 corresponding to the predetermined target 15. Accordingly, a process that may be required to form the compensation structure may be simplified or saved. In addition, in order to avoid the defects of water seepage, dust contamination, or appearance defects caused by the direct exposure of the cut light-transmitting layer 50 to the outside, a protection film may be further disposed on the side of the light-transmitting layer 50 opposite to the display pixel layer 200 according to an embodiment of the invention. Thus, the display panel 1000 can be planarized and defects that may be caused by the exposure of the compensation structure can be avoided.

In addition, although the embodiments described above all show a form in which the compensation structure is formed by laser cutting the light-transmitting layer 50 of the display panel 1000, the manner of forming the compensation structure according to other embodiments of the present invention is not limited thereto. For example, the compensation structure may be formed on the light-transmitting layer 50 by cutting in other manners. Alternatively, after the preset target point 15 is found or set, the transparent layer 50 with a compensation structure may be attached or newly added to the display pixel layer 200 without cutting any existing structural layer, so as to achieve the goal of guiding light and allowing the naked eye to ignore the preset target point 15. Accordingly, by this way, it is not necessary to cut the original structure layer in the display panel 1000, thereby avoiding possible process errors or cutting damage.

Further, in addition to the light-transmitting layer having other functions, a light-transmitting layer for repair may be previously disposed in the display panel, and the light-transmitting layer may be cut after the predetermined target point 15 is found or set. For example, referring to fig. 5, according to an embodiment of the invention, the display panel 2000 may include a substrate 100, a Polyimide (PI) layer 150, a display pixel layer 200', a thin film encapsulation layer 300, a transparent layer 500, and one or more structural layers 400 selectively disposed. The thin film encapsulation layer 300 is disposed between the display pixel layer 200 'and the transparent layer 500, and is configured to encapsulate the display pixel layer 200'. In addition, the one or more structural layers 400 selectively disposed on the side of the light-transmitting layer 500 opposite to the substrate 100 may include a polarizer, a cover plate, a protective film, or a combination thereof, and may also be any other possible stacked structure or optical layer. However, the above is merely an example and the present invention is not limited thereto.

According to this embodiment, the display panel 2000 is prepared by disposing a transparent layer 500 that does not affect the packaging property, the optical transmittance property, the display color property, and the like of the display pixel layer 200'. In summary, if the testing process for detecting the quality of the display panel 2000 finds that the pixels 210 have the predetermined target 15 (e.g., defective pixels) or the design needs to mask the specific predetermined target 15, the compensation structure can be formed according to the principle similar to the above to correspond to the predetermined target 15. For example, the compensation structure may be formed by spot depth cutting the transparent layer 500 with a laser 800.

In this example, since the light-transmitting layer 500 is not a structural layer that is preset by the display panel 2000 itself to perform other functions, the light-transmitting layer 500 may be thicker than the light-transmitting layer 50 in the other embodiments. Accordingly, the transparent layer 500 can be cut at different depths with more flexibility, and a desired compensation structure can be formed to guide light without changing or possibly damaging the existing functional structure layer of the display panel 2000. However, according to some embodiments of the present invention, in order to thinnest the display panel 2000, it is preferable that the thickness of the transparent layer 500 is still less than 300 μm. However, the above are only examples, and the present invention is not limited thereto.

As described above,

various compensation structures

510, 520, 530, 540, 550, and 560 are formed in the transparent layer 500 of the display panel 2000 in the manner shown in fig. 6A to 6F.

Specifically, fig. 6A shows the compensation structure 510 having the inverted triangular recess 61 penetrating the transparent layer 500 in cross section; fig. 6B shows the compensation structure 520 having the inverted trapezoidal recess 62 in cross section, and the recess 62 is formed on the top of the transparent layer 500; FIG. 6C shows a cross-sectional view of the offset structure 530 having an inverted triangular recess 63 formed in the middle of the transparent layer 500 and not contacting the top and bottom surfaces; fig. 6D shows a compensation structure 540 with an inverted trapezoidal recess 64 in the cross section, wherein the recess 64 is formed in the middle of the transparent layer 500 without contacting the top and bottom surfaces; fig. 6E shows the compensation structure 550 having the inverted triangular recess 65 formed on the top of the transparent layer 500; and fig. 6F shows the compensation structure 560 with the inverted triangular recess 66 formed at the bottom of the transparent layer 500 in cross section.

As described in the above respective examples, the transparent layer 500 has the compensation structures 510 to 560 corresponding to the predetermined target points 15; the compensation structures 510 to 560 each include an interface 35 extending toward the predetermined target 15. In addition, in some embodiments, since the recesses 62 and 64 shown in fig. 6B and 6D have bottom regions instead of bottom ends, the

compensation structures

520 and 540 are preferably applied to the predetermined target points 15 (e.g., dark spots or dark lines) that do not emit light. Thereby, it is possible to prevent or reduce the light emitted through the predetermined target point 15 such as a bright spot or a bright line from undesirably exiting through the bottom area. In detail, in the case that the predetermined target 15 is a dark spot or a dark line, since the amount of light emitted through the predetermined target 15 is very small, the light emitted through other normal display areas can be directly guided to the predetermined target 15 by the

compensation structures

520 and 540. Therefore, the existence of the predetermined target point 15 can be compensated or masked without specially guiding or obstructing the light emitted through the predetermined target point 15.

The above-mentioned aspects of the compensation structures 510 to 560 shown in fig. 6A to 6F are merely examples, and those skilled in the art should be able to arrange other compensation structures by the principle and the illustrative drawings described above without departing from the scope of the present invention.

Further, according to an embodiment of the present invention, when the preset target points and/or the preset target points arranged in a row or extending linearly are detected and found in the prepared display panel, the existence of the preset target points can be compensated or masked by the configuration structure and the manner described in any of the above embodiments. For example, the compensation structure of any embodiment of the present invention may be disposed on the transparent layer corresponding to the predetermined target point, so as to prevent or reduce the predetermined target point from being perceived or perceived. Accordingly, the appearance of the display panel can be improved, the yield of the product can be improved, and the cost loss caused by the need of eliminating the defective products can be reduced. Furthermore, the display quality and the use experience of the display panel during application can be improved.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A display panel, comprising:

a substrate;

a display pixel layer arranged on the substrate and including a preset target point; and

a transparent layer arranged on one side of the display pixel layer opposite to the substrate; the light-transmitting layer is provided with a compensation structure corresponding to the preset target point; wherein the compensation structure comprises an interface extending towards the predetermined target point, wherein the interface defines a recess filled with a medium in the light transmissive layer, the interface has a bottom end or a bottom region proximate to the display pixel layer, and an orthogonal projection of the bottom end or the bottom region on the display pixel layer falls in the predetermined target point, and a cross-sectional area of a surface of the recess parallel to the display pixel layer gradually decreases in a direction towards the display pixel layer;

the interface has a bottom end or a bottom area which is close to the display pixel layer, and an included angle between a horizontal plane which is tangent to the bottom end or the bottom area and is parallel to the surface of the display pixel layer and the interface is smaller than a first angle along the section of the transparent layer in the thickness direction;

wherein if the refractive index of the medium filled in the concave part is N1, the refractive index of the light-transmitting layer is N2, and the maximum value of the first angle is γ, then N1, N2 and γ satisfy the following relational expression;

sinγ＝N1/N2。

2. the display panel of claim 1, wherein the transparent layer functions as a cover plate or a polarizer of the display panel.

3. The display panel of claim 2, further comprising a protective film disposed on a side of the transparent layer opposite to the display pixel layer.

4. The display panel of claim 1, further comprising:

a thin film encapsulation layer disposed between the display pixel layer and the transparent layer for encapsulating the display pixel layer; and

a polarizer, a cover plate, a protective film or their combination, which is set on the side of the euphotic layer back to the base plate.

5. The display panel according to claim 1, wherein the interface extends from the top surface of the light transmissive layer away from the substrate to the bottom surface of the light transmissive layer close to the substrate.

6. The display panel of claim 1, wherein the interface extends at least a portion of the light transmissive layer from the top surface of the substrate to the bottom surface of the light transmissive layer adjacent to the substrate.

7. The display panel of claim 1, wherein the interface defines a linear trench extending in the light transmissive layer.

8. The display panel according to claim 1, wherein a maximum width of a surface of the recess parallel to the display pixel layer is as wide as a maximum width of a surface of the predetermined target point parallel to the display pixel layer along a thickness direction cross section of the display panel.

9. The display panel of claim 1, wherein the compensation structure is formed by cutting the transparent layer.