Display substrate and display screen

Abstract

According to the display substrate and the display screen provided by the embodiment of the invention, when light emitted from a squint angle of an electroluminescent structure reaches a slope interface of a color film structure and a high-refraction structure, refraction occurs, and the light deflects to a first direction; the light rays emitted from the high-refractive structure and reaching the color film structure are refracted, and the angle of deflection of the light rays to the first direction is increased. When light emitted from a squint angle of the electroluminescent structure reaches a slope interface of the color film structure and the low-refractive-index structure, the light reaching a total reflection critical angle is totally reflected, and the light deflects to the first direction from the second direction. Through the arrangement of the low-refractive-index structure and the high-refractive-index structure, the light emitting direction is adjusted according to the refraction and total reflection principle, so that light is deflected to the first direction, the light deflecting to the first direction is increased, the display brightness of the light in the first direction is increased, and the visibility of the first direction is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display substrate and a display screen. Background Art

[0002] With the development of display technology, a color filter on Encapsulation (COE) process can be used on the encapsulation layer to prevent glare. With the development of display technology, in some application scenarios, it is necessary to deflect the display brightness to a specified direction. For example, in the application scenario of the in-vehicle central control display, when there is a demand for anti-peeping, the display brightness needs to be deflected to the direction of the driver. Therefore, how to deflect the display brightness to the direction of the driver has become a technical problem that needs to be solved. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide a display substrate and a display screen. The specific technical solution is as follows:

[0004] In a first aspect, an embodiment of the present application provides a display substrate, wherein the display substrate comprises:

[0005] A first flat layer, an electroluminescent structure, a black matrix structure, a low-fold structure, a high-fold structure, and a color film structure; the refractive index of the low-fold structure is smaller than the refractive index of the color film structure, and the refractive index of the high-fold structure is larger than the refractive index of the color film structure;

[0006] The electroluminescent structure is arranged on the first flat layer, and the black matrix structure and the color filter structure are arranged on a side of the electroluminescent structure away from the first flat layer;

[0007] The high-fold structure is arranged on a side of the black matrix structure away from the first flat layer; the high-fold structure overlaps with the orthographic projection of the color filter structure on the first flat layer, and the high-fold structure is located on a first direction side of the color filter structure; the first direction is a deflection direction of the emitted light;

[0008] The low-fold structure is arranged on a side of the black matrix structure away from the first flat layer; the low-fold structure overlaps with the orthographic projection of the color filter structure on the first flat layer, and the low-fold structure is located on the second direction side of the color filter structure; the second direction is the opposite direction of the first direction.

[0009] In a possible implementation, the cross-section of the low-fold structure is trapezoidal, triangular or arc-shaped.

[0010] In a possible implementation, the cross-section of the high-fold structure is trapezoidal, triangular or arc-shaped.

[0011] In a possible implementation manner, the display substrate further includes a second flat layer; the refractive index of the second flat layer is not greater than the refractive index of the color filter structure;

[0012] The second flat layer is arranged on a side of the color filter structure away from the first flat layer.

[0013] In a possible implementation manner, the display substrate further includes a second flat layer; the refractive index of the second flat layer is greater than the refractive index of the color filter structure;

[0014] The second flat layer is arranged on a side of the color filter structure away from the first flat layer;

[0015] The color filter structure further includes a protrusion, wherein the protrusion is located at the second direction side of the color filter structure, and the protrusion is located at a side of the color filter structure away from the first flat layer.

[0016] In a possible implementation manner, the cross section of the protrusion is trapezoidal, triangular or arc-shaped.

[0017] In a possible embodiment, the display substrate also includes a pixel definition structure, which is arranged on the first flat layer and isolates the electroluminescent structure; the projection of the black matrix structure on the first flat layer is within the range of the positive projection of the pixel definition structure on the first flat layer.

[0018] In a possible implementation, the display substrate further includes a thin film encapsulation layer; the thin film encapsulation layer is disposed between the electroluminescent structure and the black matrix structure.

[0019] In a possible implementation, the color filter structure includes a first color filter structure and a second color filter structure, and the refractive index of the first color filter structure is greater than the refractive index of the second color filter structure;

[0020] The thickness of the first high-fold structure is greater than that of the second high-fold structure; the first high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the first color film structure on the first flat layer; the second high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the second color film structure on the first flat layer.

[0021] In a possible implementation, the color filter structure includes a third color filter structure and a fourth color filter structure, and the refractive index of the third color filter structure is greater than the refractive index of the fourth color filter structure;

[0022] The thickness of the first low-fold structure is less than that of the second low-fold structure; the first low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the third color film structure on the first flat layer; the second low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the fourth color film structure on the first flat layer.

[0023] In a possible implementation, the color filter structure includes a first color filter structure and a second color filter structure, and the refractive index of the first color filter structure is greater than the refractive index of the second color filter structure;

[0024] The distance between the bottom side of the first high-fold structure on the second direction side and the side of the first black matrix structure on the second direction side is smaller than the distance between the second high-fold structure on the second direction side and the second black matrix structure on the second direction side; the first high-fold structure is arranged on the first black matrix structure, and the second high-fold structure is arranged on the second black matrix structure;

[0025] The first high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the first color filter structure on the first flat layer; the second high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the second color filter structure on the first flat layer.

[0026] In a possible implementation, the color filter structure includes a third color filter structure and a fourth color filter structure, and the refractive index of the third color filter structure is greater than the refractive index of the fourth color filter structure;

[0027] The distance between the bottom edge of the first direction side of the first low-fold structure and the edge of the first direction side of the third black matrix structure is greater than the distance between the first direction side of the second low-fold structure and the first direction side of the fourth black matrix structure; the first low-fold structure is arranged on the third black matrix structure, and the second low-fold structure is arranged on the fourth black matrix structure;

[0028] The first low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the third color filter structure on the first flat layer; the second low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the fourth color filter structure on the first flat layer.

[0029] In a possible implementation, the color filter structure includes a first color filter structure and a second color filter structure, and the refractive index of the first color filter structure is greater than the refractive index of the second color filter structure;

[0030] The bottom angle of the second direction side of the first high-fold structure is smaller than the bottom angle of the second direction side of the second high-fold structure; the first high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the first color film structure on the first flat layer; the second high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the second color film structure on the first flat layer, and the bottom angle on the second direction side is the angle between the edge of the high-fold structure on the second direction side and the bottom edge close to the black matrix structure.

[0031] In a possible implementation, the color filter structure includes a third color filter structure and a fourth color filter structure, and the refractive index of the third color filter structure is greater than the refractive index of the fourth color filter structure;

[0032] The bottom angle of the first low-fold structure on the first direction side is greater than the bottom angle of the second low-fold structure on the first direction side;

[0033] The first low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the third color film structure on the first flat layer; the second low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the fourth color film structure on the first flat layer, and the bottom angle on the first direction side is the angle between the edge of the low-fold structure on the first direction side and the bottom edge close to the black matrix structure.

[0034] In a second aspect, an embodiment of the present application provides a display screen, comprising a display substrate as described in any one of the first aspects above.

[0035] Beneficial effects of the embodiments of the present application:

[0036] In a display substrate and display screen provided by an embodiment of the present application, when light emitted from an electroluminescent structure at an oblique angle reaches the slope interface between a color film structure and a high-refractive structure, refraction occurs, and the light is deflected to a first direction. When light emitted from the high-refractive structure reaches the color film structure, refraction occurs, and the angle of light deflection to the first direction increases. When light emitted from the electroluminescent structure at an oblique angle reaches the slope interface between a color film structure and a low-refractive structure, light reaching the critical angle of total reflection generates total reflection, and the light is deflected from the second direction to the first direction. By setting a low-refractive structure and a high-refractive structure, the emission direction of light is adjusted using the principles of refraction and total reflection, so that the light is deflected to the first direction, and the light deflected to the first direction increases, thereby increasing the display brightness of light in the first direction and improving visibility in the first direction.

[0037] Of course, implementing any product or method of the present application does not necessarily require achieving all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0039] Figure 1-1 This is a first schematic diagram of a display substrate according to an embodiment of the present application;

[0040] Figure 1-2 This is a schematic diagram of a first optical path of a display substrate according to an embodiment of the present application;

[0041] Figure 2-1 This is a second schematic diagram of a display substrate according to an embodiment of the present application;

[0042] Figure 2-2 A schematic diagram of a second optical path of a display substrate according to an embodiment of the present application;

[0043] Figure 3-1 A third schematic diagram of a display substrate according to an embodiment of the present application;

[0044] Figure 3-2 This is a fourth schematic diagram of a display substrate according to an embodiment of the present application;

[0045] Figure 3-3 A fifth schematic diagram of a display substrate according to an embodiment of the present application;

[0046] Figure 4 A third optical path schematic diagram of a display substrate according to an embodiment of the present application;

[0047] Figure 5-1 A sixth schematic diagram of a display substrate according to an embodiment of the present application;

[0048] Figure 5-2 is a seventh schematic diagram of a display substrate according to an embodiment of the present application;

[0049] Figure 5-3 is an eighth schematic diagram of a display substrate according to an embodiment of the present application;

[0050] Figure 5-4 is a ninth schematic diagram of a display substrate according to an embodiment of the present application;

[0051] Figure 6 is a tenth schematic diagram of a display substrate according to an embodiment of the present application;

[0052] Figure 7 This is an eleventh schematic diagram of a display substrate according to an embodiment of the present application.

[0053] Description of reference numerals:

[0054] A first flat layer 01 , an anode structure 02 , a pixel definition structure 03 , an electroluminescent structure 04 , a thin film encapsulation layer 05 , a black matrix structure 06 , a low-fold structure 07 , a high-fold structure 08 , a color film structure 09 , and a second flat layer 10 . DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field based on the present application belong to the scope of protection of the present application.

[0056] like Figure 1-1 As shown, an embodiment of the present application provides a display substrate, which includes:

[0057] A first flat layer 01, an electroluminescent structure 04, a black matrix structure 06, a low-folding structure 07, a high-folding structure 08, and a color filter structure 09; the refractive index of the low-folding structure 07 is smaller than that of the color filter structure 09, and the refractive index of the high-folding structure 08 is larger than that of the color filter structure 09;

[0058] The electroluminescent structure 04 is disposed on the first flat layer 01, and the black matrix structure 06 and the color filter structure 09 are disposed on a side of the electroluminescent structure away from the first flat layer 01;

[0059] The high-fold structure 08 is arranged on a side of the black matrix structure 06 away from the first flat layer 01; the orthographic projections of the high-fold structure 08 and the color filter structure 09 on the first flat layer 01 overlap, and the high-fold structure 08 is located on a first direction side of the color filter structure 09; the first direction is a deflection direction of the emitted light;

[0060] The low-fold structure 07 is arranged on a side of the black matrix structure 06 away from the first flat layer 01; the low-fold structure 07 overlaps with the orthographic projection of the color filter structure 09 on the first flat layer 01, and the low-fold structure 07 is located on the second direction side of the color filter structure 09; the second direction is the opposite direction of the first direction.

[0061] The electroluminescent layer (EL) structure of the display substrate is used to emit light of a specific color. The display substrate also includes an anode structure 02 and a cathode structure (not shown in the figure). When the voltage between the anode structure and the cathode structure is greater than the turn-on voltage of the light-emitting element, the electroluminescent structure will emit light. The light emitted by the electroluminescent structure can be the same or different. In an example, Figure 1-1 As shown, the pixels from the first direction to the second direction are R pixels, G pixels, and B pixels, that is, the light emitted by the electroluminescent structure is red light, green light, and blue light in sequence.

[0062] A display substrate using a COE process structure includes a black matrix structure (Black Matrix, BM) and a light-transmitting area corresponding to a pixel light-emitting area, wherein the light-transmitting area may be a color film structure, wherein the color film structure may be a color filter (Color Filter, CF), and the color film structure can only transmit light having a specific wavelength, and a color film structure whose orthographic projection on a first flat layer overlaps with the orthographic projection of an electroluminescent structure on the first flat layer is defined as a color film structure corresponding to the electroluminescent structure, the R electroluminescent structure is a red light filter, the G electroluminescent structure is a green light filter, and the B electroluminescent structure is a blue light filter.

[0063] The color film structure itself has a corresponding refractive index. BM is used to block light and prevent light passing through different color film structures from interfering with each other.

[0064] The low-fold structure 07 and the high-fold structure 08 are protruding structures disposed on the black matrix structure 06 , and the cross-section of the protruding structures may be trapezoidal, triangular or arc-shaped.

[0065] The refractive index of the low-fold structure 07 is less than that of the color film structure 09, and the refractive index of the high-fold structure 08 is greater than that of the color film structure 09. The high-fold structure 08 is located on the first direction side of the color film structure 09, and the low-fold structure 07 is located on the second direction side of the color film structure 09, which is equivalent to the high-fold structure 08 and the low-fold structure 07 being located on both sides of the pixel opening area. The color film structure is located directly above the pixel opening direction. In an example, the thickness of the color film structure is greater than the thickness of the low-fold structure and the high-fold structure. For example, the distance between the color film structure and the end of the top of the high-fold structure and the low-fold structure away from the pixel opening is not less than 1 μm.

[0066] In one example, the bottom angle of the second direction side of the high fold structure 08 needs to be ≤90°, and the bottom angle of the second direction side is the angle between the side of the second direction side of the high fold structure 08 and the bottom edge close to the black matrix structure 06. The bottom angle of the first direction side of the low fold structure 07 needs to be ≤90°, and the bottom angle of the first direction side is the angle between the side of the first direction side of the low fold structure 07 and the bottom edge close to the black matrix structure 06.

[0067] In one example, a black matrix structure 06 is provided with a low-fold structure 07 and a high-fold structure 08. The cross-sectional bottom width of the high-fold structure 08 is 5μ to 7μm, the thickness is 2μm, the bottom angle (slope angle) is 55° to 85°, the cross-sectional bottom width of the low-fold structure is as wide as possible to cover the remaining BM position, and the bottom spacing from the high-fold structure is not less than 3μm, the cross-sectional thickness of the low-fold structure is 2μm, and the bottom angle is 55° to 85°. The thickness of the color film structure can be 3μm to 5μm.

[0068] like Figure 1-2 As shown, when the light emitted from the electroluminescent structure 04 at an oblique angle reaches the slope interface between the color film structure 09 and the high-refractive structure 08, it is refracted and deflected to the first direction. When the light emitted from the high-refractive structure 08 reaches the color film structure 09, the angle at which the light is deflected to the first direction increases. When the light emitted from the electroluminescent structure 04 at an oblique angle reaches the slope interface between the color film structure 09 and the low-refractive structure 07, the light reaching the critical angle of total reflection generates total reflection, and the light is deflected from the second direction to the first direction.

[0069] By setting the low-folding structure and the high-folding structure, the emission direction of light is adjusted by utilizing the principles of refraction and total reflection, so that the light is deflected to the first direction.

[0070] In the application scenario of the in-vehicle central control display, the first direction is the direction of the driver. After the light is deflected to the first direction, the display brightness in the driver's direction can be increased to improve driving safety. At the same time, the visibility of positions such as the co-pilot can be reduced to play an anti-peeping role.

[0071] In a possible embodiment, the display substrate also includes a pixel definition structure 03, which is arranged on the first flat layer 01, and the pixel definition structure 03 isolates the electroluminescent structure 04; the projection of the black matrix structure 06 on the first flat layer 01 is located within the range of the positive projection of the pixel definition structure 03 on the first flat layer 01.

[0072] The pixel definition structure 03 isolates the electroluminescent structure 04 , and the projection of the BM on the first flat layer 01 is within the range of the positive projection of the pixel definition structure 03 on the first flat layer 01 . Because the BM is used to block light, it can avoid mutual interference between light passing through different color filter structures 09 .

[0073] The display substrate may also include structures that function as packaging and / or leveling, such as Figure 2-1 As shown, the display substrate further includes a second flat layer 10. The refractive index of the second flat layer 10 may be less than the refractive index of the color filter structure 09, or greater than the refractive index of the color filter structure 09, or equal to the refractive index of the color filter structure 09.

[0074] In a possible implementation manner, the display substrate further includes a second flat layer; the refractive index of the second flat layer is equal to the refractive index of the color filter structure 09;

[0075] The second planar layer is disposed on a side of the color filter structure 09 away from the first planar layer 01 .

[0076] When the refractive index of the second flat layer is equal to the refractive index of the color film structure 09, the light emitted from the color film structure 09 reaches the second flat layer, and the light path direction is as follows: Figure 1-2 As shown, no change occurs.

[0077] In a possible implementation manner, the display substrate further includes a second flat layer; the refractive index of the second flat layer is smaller than the refractive index of the color filter structure 09;

[0078] The second planar layer is disposed on a side of the color filter structure 09 away from the first planar layer 01 .

[0079] When the refractive index of the second flat layer is less than the refractive index of the color film structure 09, Figure 2-2 As shown, the light emitted from the color film structure 09 reaches the second flat layer, which is equivalent to the light entering the optically sparse medium from the optically dense medium. The light is refracted, and the refraction angle is greater than the incident angle. The angle of the light deflected to the first direction increases, so that the light deflected to the first direction increases, thereby increasing the display brightness of the light in the first direction and improving the visibility in the first direction.

[0080] In a possible implementation manner, the display substrate further includes a second flat layer; the refractive index of the second flat layer is greater than the refractive index of the color filter structure 09;

[0081] The second flat layer is arranged on a side of the color filter structure 09 away from the first flat layer 01;

[0082] The color filter structure 09 further includes a protruding portion, and the protruding portion is located at the second direction side of the color filter structure 09 . The protruding portion is located at a side of the color filter structure 09 away from the first flat layer 01 .

[0083] Because the raised portion is located on the second direction side of the color film structure 09, the light emitted from the high-refractive structure 08 is deflected to the first direction when it reaches the color film structure 09 itself. The light emitted from the color film structure 09 reaches the second flat layer. Because the refractive index of the second flat layer is greater than the refractive index of the color film structure 09, it is equivalent to light entering an optically dense medium from an optically sparse medium. Although the refraction angle is smaller than the incident angle, the emitted light is still deflected toward the first direction, which increases the light deflected toward the first direction, thereby increasing the display brightness of the light in the first direction and improving the visibility in the first direction.

[0084] The light emitted from the low-refractive structure 07 is deflected to the first direction when it reaches the color film structure 09. The light emitted from the color film structure 09 reaches the second flat layer. Because the refractive index of the second flat layer is greater than the refractive index of the color film structure 09, it is equivalent to light entering an optically dense medium from an optically sparse medium. The light is refracted, and the refraction angle is smaller than the incident angle. By setting a convex portion, the bottom angle of the first direction side of the convex portion needs to be ≤90°. The bottom angle of the first direction side is the angle between the side of the convex portion on the first direction side and the second direction. In a possible implementation, the cross-section of the convex portion is a trapezoid, a triangle or an arc. Figure 3-1 to Figure 3-3 As shown. Because the bottom angle of the first direction side of the convex part is not greater than 90°, the emitted light is deflected to the first direction. Taking the cross section of the convex part as a trapezoid as an example, the direction of the light path is as follows Figure 4 shown.

[0085] In a possible implementation, the display substrate further includes a thin film encapsulation layer 05 ; the thin film encapsulation layer 05 is disposed between the electroluminescent structure 04 and the black matrix structure 06 .

[0086] The thin film encapsulation layer 05 may be composed of an inorganic thin film and an organic thin film to prevent water and oxygen from penetrating into the light-emitting electroluminescent structure 04 .

[0087] When there are multiple color filter structures 09 , the refractive indices of the color filter structures 09 may be the same or different.

[0088] In a possible implementation manner, the color filter structure 09 includes a first color filter structure and a second color filter structure, and the refractive index of the first color filter structure is greater than the refractive index of the second color filter structure;

[0089] The thickness of the first high-fold structure is greater than that of the second high-fold structure; the first high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the first color film structure on the first flat layer; the second high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the second color film structure on the first flat layer.

[0090] The thickness of the high-refraction structure can be set based on the refractive index of the color film structure. The thickness is the dimension of the cross section perpendicular to the first direction, such as Figure 5-1 to Figure 5-4As shown, if the pixels from the first direction to the second direction are R pixels, G pixels, and B pixels, wherein the refractive index of the color film structure corresponding to the R pixel is 1.7, and the refractive index of the color film structure corresponding to the G pixel and the B pixel is 1.6, a high-refractive structure can be prepared by a semi-transparent mask (Haft ton mask, HTM) technology, and the thickness of the high-refractive structure corresponding to the R pixel is h1, the thickness of the high-refractive structure corresponding to the G pixel is h2, and the thickness of the high-refractive structure corresponding to the B pixel is h2. Because the refractive index of the color film structure corresponding to the R pixel is greater than the refractive index of the color film structure corresponding to the G pixel and the B pixel, if the thickness of the high-refractive structure corresponding to the R pixel is equal to the thickness of the high-refractive structure corresponding to the G pixel and the B pixel, light enters the optically sparse medium from the optically dense medium, and the light is refracted, and the refraction angle is greater than the incident angle. Because the refractive index of the color film structure corresponding to the R pixel is greater than the refractive index of the color film structure corresponding to the G pixel and the B pixel, when going from the color film structure to the high-refractive structure, the difference between the refractive index of the color film structure corresponding to the R pixel and the high-refractive structure is less than the difference between the refractive index of the color film structure corresponding to the G pixel and the B pixel and the high-refractive structure. When the refractive index difference of the structure is calculated, the refraction angle of the light corresponding to the R pixel is smaller than the refraction angle of the light corresponding to the G pixel and the B pixel, and the thickness of the high-fold structure corresponding to the R pixel is equal to the thickness of the high-fold structure corresponding to the G pixel and the B pixel, the light emitted by the R pixel is deflected to the first direction less than the light emitted by the G pixel and the B pixel. At this time, the light output efficiency of the RGB pixels is different. If the thickness of the first high-fold structure is greater than the thickness of the second high-fold structure, that is, the thickness of the high-fold structure corresponding to the R pixel is increased, the thickness of the high-fold structure corresponding to the G pixel is equal to the thickness of the high-fold structure corresponding to the B pixel, that is, h1>h2, so that more red light is deflected by the high-fold structure corresponding to the R pixel, and the light deflected by the high-fold structure corresponding to the R pixel is more than the light deflected by the high-fold structure corresponding to the G pixel and the B pixel, so that the light output efficiency of the RGB pixels can be balanced.

[0091] In one example, the thickness of the high-fold structure corresponding to the R pixel is 0.5 μm higher than the thickness of the high-fold protrusions corresponding to the G pixel and the B pixel.

[0092] In a possible implementation manner, the color filter structure 09 includes a third color filter structure and a fourth color filter structure, and the refractive index of the third color filter structure is greater than the refractive index of the fourth color filter structure;

[0093] The thickness of the first low-fold structure is less than that of the second low-fold structure; the first low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the third color film structure on the first flat layer; the second low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the fourth color film structure on the first flat layer.

[0094] The thickness of the low-refraction structure can be set based on the refractive index of the color film structure. Figure 5-1 to Figure 5-4As shown, if the pixels from the first direction to the second direction are R pixels, G pixels, and B pixels, wherein the refractive index of the color film structure corresponding to the R pixel is 1.7, and the refractive index of the color film structure corresponding to the G pixel and the B pixel is 1.6, a low-refractive structure can be prepared by a semi-transparent film mask (Haft ton mask, HTM) technology, and the thickness of the low-refractive structure corresponding to the R pixel is h3, the thickness of the low-refractive structure corresponding to the G pixel is h4, and the thickness of the low-refractive structure corresponding to the B pixel is h4. Because the refractive index of the color film structure corresponding to the R pixel is greater than the refractive index of the color film structure corresponding to the G pixel and the B pixel, if the thickness of the low-refractive structure corresponding to the R pixel is equal to the thickness of the low-refractive structure corresponding to the G pixel and the B pixel, light enters the light-sparse medium from the optically dense medium, and the light reaching the critical angle of total reflection generates total reflection, because the formula of the critical angle of the total reflection condition is sinC=1 / n, wherein C represents the critical angle, n represents the refractive index of the optically dense medium. The larger the refractive index of the color filter structure, the smaller the corresponding critical angle. In other words, the larger the refractive index of the color filter structure, the easier it is for the light emitted from the color filter structure to be totally reflected when it reaches the low-refractive structure. Because the refractive index of the color filter structure corresponding to the R pixel is greater than the refractive index of the color filter structure corresponding to the G pixel and the B pixel, more light emitted from the R pixel is totally reflected. When the thickness of the low-refractive structure corresponding to the R pixel is equal to the thickness of the low-refractive structure corresponding to the G pixel and the B pixel, the light emitted by the R pixel deflects more toward the first direction than the light emitted by the G pixel and the B pixel. At this time, the light extraction efficiency of the RGB pixels is different. If the thickness of the first low-refractive structure is less than the thickness of the second low-refractive structure, that is, h3<h4, more green light and blue light are deflected through the corresponding low-refractive structure, and the light deflected by the low-refractive structure corresponding to the R pixel is less than the light deflected by the corresponding low-refractive structure of the G pixel and the B pixel, so that the light extraction efficiency of the RGB pixels can be balanced.

[0095] In one example, the thickness of the low-fold structure corresponding to the R pixel is 0.5 μm lower than the thickness of the low-fold protrusion corresponding to the G pixel and the B pixel.

[0096] In a possible implementation, the color filter structure includes a first color filter structure and a second color filter structure, and the refractive index of the first color filter structure is greater than the refractive index of the second color filter structure;

[0097] The distance between the bottom side of the first high-fold structure on the second direction side and the side of the first black matrix structure on the second direction side is smaller than the distance between the second high-fold structure on the second direction side and the second black matrix structure on the second direction side; the first high-fold structure is arranged on the first black matrix structure, and the second high-fold structure is arranged on the second black matrix structure;

[0098] The first high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the first color filter structure on the first flat layer; the second high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the second color filter structure on the first flat layer.

[0099] The width of the high-refraction structure can be set based on the refractive index of the color film structure. Figure 6 As shown, if the pixels from the first direction to the second direction are R pixels, G pixels, and B pixels, wherein the refractive index of the color film structure corresponding to the R pixel is 1.7, and the refractive index of the color film structure corresponding to the G pixel and the B pixel is 1.6, a high-refractive structure can be prepared by a semi-transparent film mask (Haft tonmask, HTM) technology, and the distance between the bottom edge of the second direction side of the R pixel and the edge of the second direction side of the first black matrix structure is Gap1, and the distance between the bottom edge of the second direction side of the G pixel and the edge of the second direction side of the second black matrix structure is Gap2. Because the refractive index of the color film structure corresponding to the R pixel is greater than the refractive index of the color film structure corresponding to the G pixel and the B pixel, if the Gap1 of the high-refractive structure corresponding to the R pixel is equal to the Gap2 of the high-refractive structure corresponding to the G pixel and the B pixel, light enters the light-sparse medium from the optically dense medium, and the light is refracted, and the refraction angle is greater than the incident angle. Because the refractive index of the color film structure corresponding to the R pixel is greater than the refractive index of the color film structure corresponding to the G pixel and the B pixel, when going from the color film structure to the high-refractive structure, the refractive index of the color film structure corresponding to the R pixel The difference between the refractive index and the refractive index of the high-refractive structure is smaller than the difference between the refractive index of the color film structure corresponding to the G pixel and the B pixel and the refractive index of the high-refractive structure, and the refractive angle of the light corresponding to the R pixel is smaller than the refractive angle corresponding to the G pixel and the B pixel. When the Gap1 of the high-refractive structure corresponding to the R pixel is equal to or greater than the Gap2 of the high-refractive structure corresponding to the G pixel and the B pixel, the light emitted by the R pixel deflected in the first direction is less than the light emitted by the G pixel and the B pixel. At this time, the light output efficiency of the RGB pixels is different, and Gap1 is smaller than Gap2, so that more red light is deflected through the high-refractive structure corresponding to the R pixel. The light deflected through the high-refractive structure corresponding to the R pixel is more than the light deflected by the high-refractive structure corresponding to the G pixel and the B pixel. Gap1 is set to be smaller than Gap2, so that the light output efficiency of the RGB pixels can be balanced.

[0100] In one example, Gap1 is 0.5 μm to 1 μm smaller than Gap2.

[0101] In a possible implementation, the color filter structure includes a third color filter structure and a fourth color filter structure, and the refractive index of the third color filter structure is greater than the refractive index of the fourth color filter structure;

[0102] The distance between the bottom edge of the first direction side of the first low-fold structure and the edge of the first direction side of the third black matrix structure is greater than the distance between the first direction side of the second low-fold structure and the first direction side of the fourth black matrix structure; the first low-fold structure is arranged on the third black matrix structure, and the second low-fold structure is arranged on the fourth black matrix structure;

[0103] The first low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the third color filter structure on the first flat layer; the second low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the fourth color filter structure on the first flat layer.

[0104] The width of the low-fold structure can be set based on the refractive index of the color film structure. Figure 6 As shown, if the pixels from the first direction to the second direction are R pixels, G pixels, and B pixels, wherein the refractive index of the color film structure corresponding to the R pixel is 1.7, and the refractive index of the color film structure corresponding to the G pixel and the B pixel is 1.6, the low-refractive structure can be prepared by a semi-transparent film mask (Haft tonmask, HTM) technology, and the distance between the bottom edge of the first direction side of the R pixel and the edge of the first direction side of the first black matrix structure is Gap3, and the distance between the bottom edge of the first direction side of the G pixel and the edge of the first direction side of the second black matrix structure is Gap4. Because the refractive index of the color film structure corresponding to the R pixel is greater than the refractive index of the color film structure corresponding to the G pixel and the B pixel, if the Gap3 of the low-refractive structure corresponding to the R pixel is equal to the Gap4 of the low-refractive structure corresponding to the G pixel and the B pixel, light enters the light-sparse medium from the optically dense medium, and the light reaching the critical angle of total reflection generates total reflection, because the formula of the critical angle of the total reflection condition is sinC =1 / n, where C represents the critical angle, and n represents the refractive index of the optically dense medium. The larger the refractive index of the color filter structure, the smaller the corresponding critical angle. In other words, the larger the refractive index of the color filter structure, the easier it is for the light emitted from the color filter structure to be totally reflected when it reaches the low-refractive structure. Because the refractive index of the color filter structure corresponding to the R pixel is greater than that of the color filter structure corresponding to the G pixel and the B pixel, more light emitted from the R pixel is totally reflected. When the Gap3 of the low-refractive structure corresponding to the R pixel is equal to the Gap4 of the low-refractive structure corresponding to the G pixel and the B pixel, the light emitted from the R pixel deflects toward the first direction more than the light emitted from the G pixel and the B pixel. At this time, the light extraction efficiency of the RGB pixels is different. Setting Gap3>Gap4 allows more green light and blue light to be deflected through the corresponding low-refractive structure. The light deflected by the low-refractive structure corresponding to the R pixel is less than the light deflected by the low-refractive structure corresponding to the G pixel and the B pixel. Setting Gap3 greater than Gap4 can balance the light extraction efficiency of the RGB pixels.

[0105] In one example, Gap3 was 0.5 μm to 1 μm larger than Gap4.

[0106] In a possible implementation, the color filter structure includes a first color filter structure and a second color filter structure, and the refractive index of the first color filter structure is greater than the refractive index of the second color filter structure;

[0107] The bottom angle of the second direction side of the first high-fold structure is smaller than the bottom angle of the second direction side of the second high-fold structure; the first high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the first color film structure on the first flat layer; the second high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the second color film structure on the first flat layer, and the bottom angle on the second direction side is the angle between the edge of the high-fold structure on the second direction side and the bottom edge close to the black matrix structure.

[0108] like Figure 7As shown in the figure, PLN is the first flat layer, Anode is the anode structure, PDL is the pixel definition structure, BM is the black matrix structure, TFE is the thin film encapsulation layer, if the pixels from the first direction to the second direction are R pixels, G pixels, and B pixels, REL is the electroluminescent structure of the R pixel, G EL is the electroluminescent structure of the G pixel, and B EL is the electroluminescent structure of the B pixel, wherein the refractive index of the color film structure (R resin) corresponding to the R pixel is 1.7, and the refractive index of the color film structure (G resin) corresponding to the G pixel and the color film structure (B resin) corresponding to the B pixel is 1.6, which can be obtained by a semi-transparent film mask (Haft ton The low-refractive index structure is prepared by using the high-refractive index mask (HTM) technology. The bottom angle of the second direction side of the R pixel is θ1, and the bottom angle of the second direction side of the G pixel is θ2. Because the refractive index of the color film structure corresponding to the R pixel is greater than the refractive index of the color film structure corresponding to the G pixel and the B pixel, if θ1 of the high-refractive index structure corresponding to the R pixel is equal to θ2 of the high-refractive index structure corresponding to the G pixel and the B pixel, the light enters the light-sparse medium from the optically dense medium, and the light is refracted, and the refraction angle is greater than the incident angle. Because the refractive index of the color film structure corresponding to the R pixel is greater than the refractive index of the color film structure corresponding to the G pixel and the B pixel, when going from the color film structure to the high-refractive index structure, the difference between the refractive index of the color film structure corresponding to the R pixel and the refractive index of the high-refractive index structure is less than that of the G pixel and the B pixel. The difference between the refractive index of the color film structure corresponding to the B pixel and the refractive index of the high-refractive structure, the refractive angle of the light corresponding to the R pixel is smaller than the refractive angle corresponding to the G pixel and the B pixel. When θ1 of the high-refractive structure corresponding to the R pixel is equal to θ2 of the high-refractive structure corresponding to the G pixel and the B pixel, the light emitted by the R pixel is deflected to the first direction less than the light emitted by the G pixel and the B pixel. At this time, the light output efficiency of the RGB pixels is different. If θ1 is less than θ2, more red light is deflected by the high-refractive structure corresponding to the R pixel, that is, the light deflected by the high-refractive structure corresponding to the R pixel is more than the light deflected by the high-refractive structure corresponding to the G pixel and the B pixel. Setting θ1 less than θ2 can balance the light output efficiency of the RGB pixels.

[0109] In one example, θ1 is 5° to 10° smaller than θ2.

[0110] In a possible implementation, the color filter structure includes a third color filter structure and a fourth color filter structure, and the refractive index of the third color filter structure is greater than the refractive index of the fourth color filter structure;

[0111] The bottom angle of the first low-fold structure on the first direction side is greater than the bottom angle of the second low-fold structure on the first direction side;

[0112] The first low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the third color filter structure on the first flat layer; the second low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the fourth color filter structure on the first flat layer, and the bottom angle on the first direction side is the angle between the edge on the first direction side of the low-fold structure and the bottom edge close to the black matrix structure. Figure 7 As shown in the figure, PLN is the first flat layer, Anode is the anode structure, PDL is the pixel definition structure, BM is the black matrix structure, if the pixels from the first direction to the second direction are R pixels, G pixels, and B pixels, R EL is the electroluminescent structure of the R pixel, G EL is the electroluminescent structure of the G pixel, and B EL is the electroluminescent structure of the B pixel, wherein the refractive index of the color film structure (R resin) corresponding to the R pixel is 1.7, and the refractive index of the color film structure (G resin) corresponding to the G pixel and the color film structure (B resin) corresponding to the B pixel is 1.6, which can be obtained by a semi-transparent film mask (Haft ton The low-refractive structure is prepared by using the color filter mask (HTM) technology. The bottom angle of the R pixel in the first direction is θ3, and the bottom angle of the G pixel in the second direction is θ4. Because the refractive index of the color filter structure corresponding to the R pixel is greater than the refractive index of the color filter structure corresponding to the G pixel and the B pixel, if θ3 of the low-refractive structure corresponding to the R pixel is equal to θ4 of the low-refractive structure corresponding to the G pixel and the B pixel, the light enters the optically sparse medium from the optically dense medium, and the light reaching the critical angle of total reflection produces total reflection. Because the formula of the critical angle of the total reflection condition is sinC=1 / n, where C represents the critical angle, and n represents the refractive index of the optically dense medium, the larger the refractive index of the color filter structure, the smaller the corresponding critical angle. In other words, the larger the refractive index of the color filter structure, the closer the light emitted from the color filter structure reaches. Total reflection is more likely to occur in a low-refractive structure because the refractive index of the color film structure corresponding to the R pixel is greater than the refractive index of the color film structure corresponding to the G pixel and the B pixel. More light emitted by the R pixel is totally reflected. When θ3 of the low-refractive structure corresponding to the R pixel is equal to θ4 of the low-refractive structure corresponding to the G pixel and the B pixel, the light emitted by the R pixel is more deflected in the first direction than the light emitted by the G pixel and the B pixel. At this time, the light output efficiency of the RGB pixels is different, θ3 is greater than θ4, so that more green light and blue light are deflected through the corresponding low-refractive structure, that is, the light deflected by the low-refractive structure corresponding to the R pixel is more than the light deflected by the corresponding low-refractive structure of the G pixel and the B pixel. Setting θ3 to be less than θ4 can balance the light output efficiency of the RGB pixels.

[0113] In one example, θ3 is 5° to 10° smaller than θ4.

[0114] An embodiment of the present application also provides a display screen, comprising any of the display substrates described above.

[0115] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0116] Each embodiment in this specification is described in a related manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referenced to each other.

[0117] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A display substrate, characterized in that: The display substrate comprises: A first flat layer, an electroluminescent structure, a black matrix structure, a low-fold structure, a high-fold structure, and a color film structure; the refractive index of the low-fold structure is smaller than the refractive index of the color film structure, and the refractive index of the high-fold structure is larger than the refractive index of the color film structure; The electroluminescent structure is arranged on the first flat layer, and the black matrix structure and the color filter structure are arranged on a side of the electroluminescent structure away from the first flat layer; The high-fold structure is arranged on a side of the black matrix structure away from the first flat layer; the high-fold structure overlaps with the orthographic projection of the color filter structure on the first flat layer, and the high-fold structure is located on a first direction side of the color filter structure; the first direction is a deflection direction of the emitted light; The low-fold structure is arranged on a side of the black matrix structure away from the first flat layer; the low-fold structure overlaps with the orthographic projection of the color filter structure on the first flat layer, and the low-fold structure is located on the second direction side of the color filter structure; the second direction is the opposite direction of the first direction.

2. The display substrate according to claim 1, characterized in that: The cross section of the low-fold structure is trapezoidal, triangular or arc-shaped.

3. The display substrate according to claim 1, characterized in that: The cross section of the high-fold structure is trapezoidal, triangular or arc-shaped.

4. The display substrate according to claim 1, characterized in that: The display substrate further includes a second flat layer; the refractive index of the second flat layer is not greater than the refractive index of the color filter structure; The second flat layer is arranged on a side of the color filter structure away from the first flat layer.

5. The display substrate according to claim 1, characterized in that: The display substrate further includes a second flat layer; the refractive index of the second flat layer is greater than the refractive index of the color filter structure; The second flat layer is arranged on a side of the color filter structure away from the first flat layer; The color filter structure further includes a protrusion, wherein the protrusion is located at the second direction side of the color filter structure, and the protrusion is located at a side of the color filter structure away from the first flat layer.

6. The display substrate according to claim 5, characterized in that: The cross section of the protrusion is trapezoidal, triangular or arc-shaped.

7. The display substrate according to claim 1, characterized in that: The display substrate further comprises a pixel definition structure, wherein the pixel definition structure is disposed on the first planar layer, and the pixel definition structure isolates the electroluminescent structure; The projection of the black matrix structure on the first planar layer is located within the range of the orthographic projection of the pixel definition structure on the first planar layer.

8. The display substrate according to claim 1, characterized in that: The display substrate further comprises a thin film encapsulation layer; the thin film encapsulation layer is arranged between the electroluminescent structure and the black matrix structure.

9. The display substrate according to any one of claims 1 to 8, characterized in that: The color filter structure includes a first color filter structure and a second color filter structure, and the refractive index of the first color filter structure is greater than the refractive index of the second color filter structure; The thickness of the first high-fold structure is greater than that of the second high-fold structure; the first high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the first color film structure on the first flat layer; the second high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the second color film structure on the first flat layer.

10. The display substrate according to any one of claims 1 to 8, characterized in that: The color filter structure includes a third color filter structure and a fourth color filter structure, and the refractive index of the third color filter structure is greater than the refractive index of the fourth color filter structure; The thickness of the first low-fold structure is less than that of the second low-fold structure; the first low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the third color film structure on the first flat layer; the second low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the fourth color film structure on the first flat layer.

11. The display substrate according to any one of claims 1 to 8, characterized in that: The color filter structure includes a first color filter structure and a second color filter structure, and the refractive index of the first color filter structure is greater than the refractive index of the second color filter structure; The distance between the bottom side of the first high-fold structure on the second direction side and the side of the first black matrix structure on the second direction side is smaller than the distance between the second high-fold structure on the second direction side and the second black matrix structure on the second direction side; the first high-fold structure is arranged on the first black matrix structure, and the second high-fold structure is arranged on the second black matrix structure; The first high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the first color filter structure on the first flat layer; the second high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the second color filter structure on the first flat layer.

12. The display substrate according to any one of claims 1 to 8, characterized in that: The color filter structure includes a third color filter structure and a fourth color filter structure, and the refractive index of the third color filter structure is greater than the refractive index of the fourth color filter structure; The distance between the bottom edge of the first direction side of the first low-fold structure and the edge of the first direction side of the third black matrix structure is greater than the distance between the first direction side of the second low-fold structure and the first direction side of the fourth black matrix structure; the first low-fold structure is arranged on the third black matrix structure, and the second low-fold structure is arranged on the fourth black matrix structure; The first low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the third color filter structure on the first flat layer; the second low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the fourth color filter structure on the first flat layer.

13. The display substrate according to any one of claims 1 to 8, characterized in that: The color filter structure includes a first color filter structure and a second color filter structure, and the refractive index of the first color filter structure is greater than the refractive index of the second color filter structure; The bottom angle of the second direction side of the first high-fold structure is smaller than the bottom angle of the second direction side of the second high-fold structure; the first high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the first color film structure on the first flat layer; the second high-fold structure is a high-fold structure whose projection on the first flat layer overlaps with the projection of the second color film structure on the first flat layer, and the bottom angle on the second direction side is the angle between the edge of the high-fold structure on the second direction side and the bottom edge close to the black matrix structure.

14. The display substrate according to any one of claims 1 to 8, characterized in that: The color filter structure includes a third color filter structure and a fourth color filter structure, and the refractive index of the third color filter structure is greater than the refractive index of the fourth color filter structure; The bottom angle of the first low-fold structure on the first direction side is greater than the bottom angle of the second low-fold structure on the first direction side; The first low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the third color film structure on the first flat layer; the second low-fold structure is a low-fold structure whose projection on the first flat layer overlaps with the projection of the fourth color film structure on the first flat layer, and the bottom angle on the first direction side is the angle between the edge of the low-fold structure on the first direction side and the bottom edge close to the black matrix structure.

15. A display screen, characterized in that: A display substrate comprising any one of claims 1 to 14.

Images