Display panel and display device

Abstract

The invention discloses a display panel and a display device.The display panel comprises a display substrate, a light regulation and control layer and an anti-reflection layer which are sequentially arranged in a stacked mode, the display substrate comprises a substrate and a light-emitting layer, and the light-emitting layer comprises light-emitting units; the light regulation and control layer is located on the side, away from the substrate, of the light-emitting layer and used for converting light emitted by the light-emitting unit into first rotation-direction circularly polarized light capable of penetrating through the light regulation and control layer and second rotation-direction circularly polarized light reflected towards the display substrate through the light regulation and control layer. The rotation directions of the first rotation-direction circular polarized light and the second rotation-direction circular polarized light are opposite, and the modulation spectrum width of the light regulation and control layer on the light emitted by the preset light emitting unit is smaller than twice of the half-peak width of the light emitting spectrum of the preset light emitting unit; the anti-reflection layer comprises a phase delay layer and a linear polarization layer which are stacked in the direction away from the light regulation and control layer. According to the display panel provided by the invention, the light emitting efficiency of a positive visual angle and the peep-proof effect of a large visual angle are considered.

Description

Technical Field

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

[0002] In existing display panels that use anti-peep display technology, microcavity adjustment and optical design are generally used to optimize the brightness attenuation of the display panel under a wide viewing angle. However, this method has large optical losses and high panel power consumption, which is not in line with the concept of energy conservation and emission reduction. Summary of the invention

[0003] The purpose of this application is to at least solve the problem that low power consumption and anti-peeping effect of the display panel cannot be taken into account at the same time. This purpose is achieved through the following technical solutions:

[0004] A first aspect of the present application provides a display panel, comprising:

[0005] A display substrate, comprising a base substrate and a light-emitting layer located on one side of the base substrate, wherein the light-emitting layer comprises a light-emitting unit;

[0006] a light regulation layer, located on a side of the light emitting layer away from the base substrate, the light regulation layer being used to convert the light emitted by the light emitting unit into a first-handed circularly polarized light that can pass through the light regulation layer and a second-handed circularly polarized light that is reflected by the light regulation layer toward the display substrate, so that the display substrate reflects the second-handed circularly polarized light as the first-handed circularly polarized light and passes through the light regulation layer, the first-handed circularly polarized light and the second-handed circularly polarized light have opposite hand directions, and the light regulation layer modulates the light emitted by the preset light emitting unit with a spectrum width that is less than twice the half-peak width of the preset light emission spectrum of the light emitting unit;

[0007] An anti-reflection layer is located on the side of the light regulating layer away from the light emitting layer, and the anti-reflection layer includes a phase delay layer and a linear polarization layer stacked in a direction away from the light regulating layer, and the phase delay layer is used to convert the first-hand circularly polarized light into a first linearly polarized light, and the transmission axis direction of the linear polarization layer is parallel to the vibration direction of the first linearly polarized light.

[0008] In the display panel provided by the present application, the light-emitting unit in the display substrate is used to emit light, and the light-regulating layer and the anti-reflection layer are used to regulate the light emitted by the light-emitting unit. The light-regulating layer is used to convert the part of the light emitted by the light-emitting unit that is vertically incident on the light-regulating layer and is located within the modulation spectrum width into two circularly polarized lights of two rotation directions, wherein one circularly polarized light of one rotation direction is a first circularly polarized light, and the other circularly polarized light of another rotation direction is a second circularly polarized light, the first circularly polarized light and the second circularly polarized light have opposite rotation directions, and the light-regulating layer can completely transmit the circularly polarized light of the first rotation direction and completely reflect the circularly polarized light of the second rotation direction. After the circularly polarized light of the first rotation direction passes through the phase delay layer in the anti-reflection layer, it is converted into linearly polarized light, and the vibration direction (polarization direction) of the linearly polarized light is parallel to the transmission axis direction of the linear polarization layer in the anti-reflection layer, so that it can pass through the linear polarization layer almost without loss. After being reflected by the light regulation layer, the circularly polarized light of the second rotation direction is emitted toward the display substrate. The display substrate can reflect the circularly polarized light of the second rotation direction into the circularly polarized light of the first rotation direction and transmit through the light regulation layer. The circularly polarized light of the first rotation direction can transmit through the anti-reflection layer almost without loss, so that the light regulation layer can gain the part of the light emitted by the light emitting unit that is vertically incident on the light regulation layer and is located within the modulation spectrum width, thereby improving the light extraction efficiency of this part of the light, so that the power consumption of the display panel at a specific brightness can be lower. As the viewing angle increases, the transmission wavelength gradually moves away from the central wavelength of the modulation spectrum width, and the light gain effect gradually fails, so that the light extraction efficiency of the light at a large viewing angle is lower, and the brightness and contrast are also lower, so that the anti-peeping effect can be achieved. And the light regulation layer only has a modulation effect on the light within the modulation spectrum width, and the modulation spectrum width of the light emitted by the preset light emitting unit by the light regulation layer is set to be less than twice the half-peak width of the light spectrum of the preset light emitting unit, so that the light outside the modulation spectrum width is not modulated, that is, the light extraction efficiency is lower, the brightness and contrast are also lower, so as to improve the anti-peeping effect.

[0009] In the display panel provided in the present application, on the one hand, the light output efficiency at the normal viewing angle is improved and the power consumption of the display panel is reduced. At the same time, the brightness attenuation effect of the display panel at a wide viewing angle is further optimized, thereby improving the anti-peeping effect. That is, the display panel achieves a balance between the light output efficiency at the normal viewing angle and the anti-peeping effect at a wide viewing angle.

[0010] In some embodiments of the present application, the light regulation layer is capable of passing light in the first wavelength band, the second wavelength band and the third wavelength band, wherein the wavelength of the light in the first wavelength band is λ1, 450nm≤λ1≤470nm, the wavelength of the light in the second wavelength band is λ2, 510nm≤λ2≤540nm, and the wavelength of the light in the third wavelength band is λ3, 615nm≤λ3≤645nm; and the reflectivity of the light regulation layer to light in at least two wavelength bands of the first wavelength band, the second wavelength band and the third wavelength band is greater than or equal to 40%.

[0011] In some embodiments of the present application, the light regulating layer includes a cholesteric liquid crystal material having a microscopic spiral structure.

[0012] In some embodiments of the present application, the light-emitting unit includes a red light-emitting unit for generating light of the third wavelength band, a green light-emitting unit for generating light of the second wavelength band, and a blue light-emitting unit for generating light of the first wavelength band, and the display panel satisfies at least one of the following:

[0013] The first modulation spectrum width of the light regulating layer for the light of the first wavelength band is W(1), and W(1) is less than twice the half-peak width of the light emission spectrum of the blue light emitting unit;

[0014] The second modulation spectrum width of the light regulating layer for the second wavelength band light is W(2), and W(2) is less than twice the half-peak width of the light emission spectrum of the green light emitting unit;

[0015] The third modulation spectrum width of the light regulating layer for the third wavelength band light is W(3), and W(3) is less than twice the half-peak width of the light emission spectrum of the red light emitting unit.

[0016] In some embodiments of the present application, the light regulation layer includes at least one of a first cholesteric liquid crystal layer, a second cholesteric liquid crystal layer and a third cholesteric liquid crystal layer, wherein the first cholesteric liquid crystal layer is used to modulate the light of the first band, the second cholesteric liquid crystal layer is used to modulate the light of the second band, and the third cholesteric liquid crystal layer is used to modulate the light of the third band.

[0017] In some embodiments of the present application, the first cholesteric liquid crystal layer includes a solid first cholesteric liquid crystal, the second cholesteric liquid crystal layer includes a solid second cholesteric liquid crystal, and the third cholesteric liquid crystal layer includes a solid third cholesteric liquid crystal.

[0018] In some embodiments of the present application, the light regulation layer includes a first cholesteric liquid crystal layer, a second cholesteric liquid crystal layer and a third cholesteric liquid crystal layer arranged in a direction parallel to the plane where the display panel is located, the first cholesteric liquid crystal layer is located on a side of the blue light emitting unit away from the display substrate, and is used to modulate the light of the first wavelength band, the second cholesteric liquid crystal layer is located on a side of the green light emitting unit away from the display substrate, and is used to modulate the light of the second wavelength band, and the third cholesteric liquid crystal layer is located on a side of the red light emitting unit away from the display substrate, and is used to modulate the light of the third wavelength band;

[0019] Alternatively, the light regulating layer includes a first cholesteric liquid crystal layer, a second cholesteric liquid crystal layer and a third cholesteric liquid crystal layer stacked along the thickness direction of the display panel.

[0020] In some embodiments of the present application, the phase retarder layer includes a quarter phase retarder.

[0021] In some embodiments of the present application, the transmittance of the linear polarization layer to light in the wavelength range of 460nm to 630nm is greater than or equal to 40%.

[0022] In some embodiments of the present application, the anti-reflection layer further includes at least one light absorbing layer, and the light absorbing layer is located on a side of the linear polarization layer away from the phase retardation layer.

[0023] In some embodiments of the present application, the light absorbing layer can absorb light with a wavelength less than or equal to 450 nm.

[0024] In some embodiments of the present application, the light-emitting layer further includes a pixel defining portion, the pixel defining portion includes a plurality of pixel openings, the light-emitting unit is located within the pixel opening, and a material of the pixel defining portion includes a light-shielding material.

[0025] In some embodiments of the present application, the absorbance of the pixel defining portion to light with a wavelength in the range of 430 nm to 700 nm is greater than or equal to 3.0 / μm.

[0026] In some embodiments of the present application, a cross-section of the pixel defining portion along the thickness direction of the substrate is a trapezoid, and a base angle of the trapezoid is less than or equal to 35°.

[0027] In some embodiments of the present application, a light blocking layer is further included, wherein the light blocking layer is located between the display substrate and the light regulating layer, and the orthographic projection of the light blocking layer on the base substrate is located within the orthographic projection of the pixel defining portion on the base substrate.

[0028] In some embodiments of the present application, in a first direction, the distance between the orthographic projection boundary of the light blocking layer on the substrate and the orthographic projection boundary of the corresponding pixel defining portion on the substrate is a first distance, the width of the pixel opening adjacent to the light blocking layer along the first direction is a preset width, the ratio of the first distance to the preset width is less than or equal to one quarter, and the first direction is a direction from the pixel opening on one side of the light blocking layer to the pixel opening on the other side.

[0029] In some embodiments of the present application, the absorbance of the light blocking layer to light with a wavelength in the range of 430 nm to 700 nm is greater than or equal to 3.0 / μm.

[0030] In some embodiments of the present application, the light blocking layer includes a plurality of light blocking portions, and the plurality of light blocking portions are dispersedly arranged between adjacent pixel openings; or, the orthographic projection of the light blocking layer on the base substrate is a mesh structure.

[0031] In some embodiments of the present application, the cross-section of the light blocking layer along the thickness direction of the base substrate is a first trapezoid, and the cross-section of the pixel defining portion along the thickness direction of the base substrate is a second trapezoid, and the bottom angle of the first trapezoid is greater than or equal to the bottom angle of the second trapezoid.

[0032] In some embodiments of the present application, a planar layer is further included, and the planar layer is located on a side of the light-blocking layer away from the light-emitting layer.

[0033] In some embodiments of the present application, the display substrate further includes an encapsulation layer and a touch layer which are sequentially stacked on a side of the light-emitting layer away from the base substrate.

[0034] In some embodiments of the present application, the display substrate also includes a light extraction layer, which is located between the light-emitting layer and the encapsulation layer, and the encapsulation layer includes a first inorganic layer close to the light-emitting layer. The difference between the refractive index of the light extraction layer and the refractive index of the first inorganic layer is greater than 0.1, and the refractive index of the light extraction layer is greater than the refractive index of the first inorganic layer.

[0035] The second aspect of the present application further provides a display device, comprising any display panel provided in the first aspect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0037] Figure 1 is a structural schematic diagram of a display panel provided by the present application;

[0038] Figure 2 yes Figure 1 A schematic diagram of a first cross-sectional view along the Q-Q' line;

[0039] Figure 3 yes Figure 1 A schematic diagram of a second cross-sectional view along the middle line Q-Q';

[0040] Figure 4 It is a schematic diagram of the film structure of a light-emitting layer in a display panel provided by the present application;

[0041] Figure 5 This is a schematic diagram of spectrum normalization within a display panel provided by the present application;

[0042] Figure 6 yes Figure 1 A schematic diagram of a third cross-sectional view along the middle line Q-Q';

[0043] Figure 7 yes Figure 1 A schematic diagram of a fourth cross-sectional view along the middle line Q-Q';

[0044] Figure 8 yes Figure 1 A schematic diagram of a fifth cross-sectional view along the middle line Q-Q';

[0045] Fig. 9 yes Figure 1 A sixth cross-sectional view schematically shown along the middle line Q-Q';

[0046] Fig.10 is a schematic diagram of a top view of a local area of ​​a display panel provided by the present application;

[0047] Fig.11 is a schematic diagram of a top view of a local area in another display panel provided by the present application;

[0048] Fig.12 yes Figure 1 A schematic diagram of a seventh cross-sectional view along the middle line Q-Q';

[0049] Fig.13 It is a structural schematic diagram of Comparative Example 1 provided in this application;

[0050] Fig.14 The corresponding curves of viewing angle and brightness of a display panel provided in the present application and another display panel in a comparative example;

[0051] Fig.15 Normalized peak brightness and viewing angle corresponding curves of a display panel provided in the present application and another display panel in a comparative example;

[0052] Fig.16 It is a structural schematic diagram of comparative example 2 provided in this application;

[0053] Fig.17 yes Figure 1 A schematic diagram of an eighth cross-sectional view along the middle line Q-Q';

[0054] Fig.18 is a schematic diagram of the structure of an encapsulation layer in a display panel provided by the present application;

[0055] Fig.19 yes Figure 1 A ninth cross-sectional view schematically shown along the middle line Q-Q';

[0056] Fig. 20 It is a structural schematic diagram of a display device provided by the present application.

[0057] The reference numerals are as follows:

[0058] 1. Display panel; 11. Display substrate; 111. Base substrate; 112. Light-emitting layer; 1121. Light-emitting unit; 1122. Pixel defining portion; 1123. Pixel opening; 1124. Red light-emitting unit; 1125. Green light-emitting unit; 1126. Blue light-emitting unit; 1127. First electrode; 1128. Light-emitting functional layer; 1129. Second electrode; 1130. Hole injection layer; 1131. Hole transport layer; 1132. Electron blocking layer; 1133. Hole blocking layer; 1134. Electron transport layer; 1135. Electron injection layer; 1136. Blue light exciton blocking layer; 1137. Red Photoexciton blocking layer; 1138, green photoexciton blocking layer; 1139, red light emitting layer; 1140, green light emitting layer; 1141, blue light emitting layer; 113, array substrate layer; 12, light regulation layer; 121, first cholesteric liquid crystal layer; 122, second cholesteric liquid crystal layer; 123, third cholesteric liquid crystal layer; 13, anti-reflection layer; 131, phase delay layer; 132, linear polarization layer; 133, light absorption layer; 14, light blocking layer; 141, light blocking part; 15, flat layer; 16, encapsulation layer; 161, first inorganic layer; 162, organic layer; 163, second inorganic layer; 17, touch layer; 18, light extraction layer. DETAILED DESCRIPTION

[0059] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0060] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0061] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0062] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0063] like Figure 1 and Figure 2As shown, according to an embodiment of the present application, a display panel 1 is proposed, and the display panel 1 includes a stacked display substrate 11, a light regulation layer 12, and an anti-reflection layer 13. The display substrate 11 includes a base substrate 111 and a light emitting layer 112 located on one side of the base substrate 111, and the light emitting layer 112 includes a light emitting unit 1121. The light regulation layer 12 is located on the side of the light emitting layer 112 away from the base substrate 111, and the light regulation layer 12 is used to convert the light emitted by the light emitting unit 1121 into a first-handed circularly polarized light that can pass through the light regulation layer 12 and a second-handed circularly polarized light that is reflected by the light regulation layer 12 toward the display substrate 11, so that the display substrate 11 reflects the second-handed circularly polarized light as a first-handed circularly polarized light and passes through the light regulation layer 12, and the first-handed circularly polarized light has an opposite hand to the second-handed circularly polarized light. That is, the light regulation layer 12 converts a part of the light emitted by the light emitting unit 1121 into a first-handed circularly polarized light that can pass through the light regulation layer 12, and then the first-handed circularly polarized light passes through the light regulation layer 12. The light regulation layer 12 can also convert part of the light emitted by the light emitting unit 1121 into a second circularly polarized light that is reflected by the light regulation layer 12 toward the display substrate 11. After being reflected by the display substrate 11, the second circularly polarized light becomes a first circularly polarized light and passes through the light regulation layer 12.

[0064] The modulation spectrum width of the light emitted by the preset light-emitting unit 1121 by the light-regulating layer 12 is less than twice the half-peak width of the light spectrum of the preset light-emitting unit 1121 .

[0065] The anti-reflection layer 13 is located on the side of the light regulation layer 12 away from the light emitting layer 112. The anti-reflection layer 13 includes a phase delay layer 131 and a linear polarization layer 132 stacked in a direction away from the light regulation layer 12. The phase delay layer 131 is used to convert the first-hand circularly polarized light into the first linearly polarized light. The transmission axis direction of the linear polarization layer 132 is parallel to the vibration direction of the first linearly polarized light.

[0066] In the display panel 1 provided by the present application, the light emitting unit 1121 in the display substrate 11 is used to emit light, and the light regulating layer 12 and the anti-reflection layer 13 are used to regulate the light emitted by the light emitting unit 1121. The light regulating layer 12 is used to convert the part of the light emitted by the light emitting unit 1121 that is vertically incident on the light regulating layer 12 and is located within the modulation spectrum width into two kinds of circularly polarized light, wherein one kind of circularly polarized light is a first-hand circularly polarized light, and the other kind of circularly polarized light is a second-hand circularly polarized light, and the first-hand circularly polarized light and the second-hand circularly polarized light have opposite directions of rotation, and the light regulating layer 12 can completely transmit the first-hand circularly polarized light and completely reflect the second-hand circularly polarized light. After the first-hand circularly polarized light passes through the phase retardation layer 131 in the anti-reflection layer 13, it is converted into linearly polarized light, and the vibration direction (polarization direction) of the linearly polarized light is parallel to the transmission axis direction of the linear polarization layer 132 in the anti-reflection layer 13, so that it can pass through the linear polarization layer 132 almost without loss. After being reflected by the light regulation layer 12, the circularly polarized light of the second rotation direction is emitted toward the display substrate 11. The display substrate 11 can reflect the circularly polarized light of the second rotation direction into the circularly polarized light of the first rotation direction and transmit it through the light regulation layer 12. The circularly polarized light of the first rotation direction can transmit the anti-reflection layer 13 almost without loss, so that the light regulation layer 12 can gain the part of the light emitted by the light-emitting unit 1121 that is vertically incident on the light regulation layer 12 and is located within the modulation spectrum width, thereby improving the light extraction efficiency of this part of the light, so that the power consumption of the display panel 1 at a specific brightness can be lower. As the viewing angle increases, the transmission wavelength gradually moves away from the central wavelength of the modulation spectrum width, and the light gain effect gradually fails, so that the light extraction efficiency of the light at a large viewing angle is lower, and the brightness and contrast are also lower, so that the anti-peeping effect can be achieved. The light regulation layer 12 only modulates the light within the modulation spectrum width. The modulation spectrum width of the light emitted by the preset light-emitting unit 1121 is set to be less than twice the half-peak width of the light spectrum of the preset light-emitting unit 1121, so that the light outside the modulation spectrum width is not modulated, that is, the light output efficiency is low, and the brightness and contrast are also low, so as to enhance the anti-peeping effect.

[0067] In the display panel 1 provided in the present application, on the one hand, the light output efficiency at the normal viewing angle is improved and the power consumption of the display panel 1 is reduced. At the same time, the brightness attenuation effect of the display panel 1 at a large viewing angle is further optimized, thereby improving the anti-peeping effect. That is, the display panel 1 achieves a balance between the light output efficiency at the normal viewing angle and the anti-peeping effect at a large viewing angle.

[0068] In the related art, it is usually necessary to attach an anti-reflection layer 13 to the light-emitting side of the display panel 1. The anti-reflection layer 13 mainly includes a linear polarization layer 132. The light emitted by the light-emitting unit 1121 in the display panel 1 first passes through the anti-reflection layer 13 and then exits. The light emitted by the light-emitting unit 1121 that is parallel to the transmission axis of the linear polarization layer 132 can be transmitted after passing through the linear polarization layer 132, and the light emitted by the light-emitting unit 1121 that is parallel to the absorption axis of the linear polarization layer 132 cannot pass through the linear polarization layer 132. Therefore, the light emitted by the light-emitting unit 1121 has a loss of about 50% to 55% after passing through the linear polarization layer 132. In the display panel 1 provided in the present application, by setting up a light regulation layer 12, the light can be divided into two parts, one part is a first-direction circularly polarized light that can be completely transmitted, and the other part is a second-direction circularly polarized light with a direction opposite to the first-direction circularly polarized light. The second-direction circularly polarized light can be reflected by the light regulation layer 12 and then reflected by the display substrate 11 before being completely transmitted, thereby reducing the loss of light emitted by the light-emitting unit 1121 during the propagation process, thereby improving the light extraction efficiency.

[0069] Specifically, Figure 3 As shown, the display substrate 11 may include a base substrate 111, an array substrate layer 113 and a light emitting layer 112 stacked in a direction away from the base substrate 111. Figure 4 As shown, the light-emitting layer 112 includes a first electrode 1127, a light-emitting functional layer 1128 and a second electrode 1129 stacked in a direction away from the base substrate 111. The second circularly polarized light reflected by the light regulation layer 12 can be converted into the first circularly polarized light through reflection by the second electrode 1129 and the metal material in the array substrate layer 113.

[0070] Specifically, an adhesive layer (not shown in the figure) is provided on the side of the light regulating layer 12 facing and / or away from the display substrate 11. When an adhesive layer is provided on the side of the light regulating layer 12 facing the display substrate 11, the adhesive layer is used to bond and fix the light regulating layer 12 to a film layer located on the side of the light regulating layer 12 away from the anti-reflection layer 13 and adjacent to the light regulating layer 12. When an adhesive layer is provided on the side of the light regulating layer 12 away from the display substrate 11, the adhesive layer is used to bond and fix the light regulating layer 12 to the anti-reflection layer 13.

[0071] Specifically, the light regulating layer 12 includes a cholesteric liquid crystal material having a microscopic spiral structure.

[0072] When the light regulation layer 12 uses cholesteric liquid crystal material, since the light transmission wavelength λ and the viewing angle a have a relationship of λ=nPcos(α), where n is the average refractive index of the light regulation layer 12, and P is the pitch of the cholesteric liquid crystal material. As the viewing angle increases, the transmission wavelength gradually moves away from the transmission center wavelength of the cholesteric liquid crystal material, and the light gain effect gradually fails, thereby achieving brightness attenuation at a large viewing angle, reducing the contrast of light at a large viewing angle, and thus achieving an anti-peeping effect. The failure boundary of the light gain effect is: cos(α)=(2np-W(k)) / nP, where W(k) is the modulation spectrum width of the light regulation layer 12 on the light emitted by the preset light-emitting unit 1121, and W(k) is defined as the spectrum width corresponding to a 20% change in the transmittance extreme value. That is, in the display panel 1 provided in the present application, the light extraction efficiency of the part of the light whose |cos(α)| value corresponding to the viewing angle α is greater than |(2np-W(k)) / nP| is improved, and the brightness and contrast of the light whose |cos(α)| value corresponding to the viewing angle α is less than |[(2np-W(k)) / nP]| are low, thereby having an anti-peeping effect.

[0073] Specifically, in the display panel 1 provided in the present application, the light-emitting unit 1121 may include a red light-emitting unit 1124, a green light-emitting unit 1125, and a blue light-emitting unit 1126, and specifically, may also include a white light-emitting unit (not shown in the figure), and the present application does not specifically limit this. The present application takes the red light-emitting unit 1124, the green light-emitting unit 1125, and the blue light-emitting unit 1126 as an example for specific description.

[0074] Specifically, Figure 4 As shown, the light-emitting unit 1121 includes a first electrode 1127, a light-emitting functional layer 1128, and a second electrode 1129 stacked in a direction away from the base substrate 111. The light-emitting functional layer 1128 includes a first functional layer group, a light-emitting material layer 1142, and a second functional layer group. The first functional layer group includes a hole injection layer 1130, a hole transport layer 1131, and an electron blocking layer 1132. The second functional layer group includes a hole blocking layer 1133, an electron transport layer 1134, and an electron injection layer 1135. The light-emitting unit 1121 includes a red light-emitting unit 1124, a green light-emitting unit 1125, and a blue light-emitting unit 1126. The electron blocking layer 1132 includes a blue light exciton blocking layer 1136 located in the blue light-emitting unit 1126, a red light exciton blocking layer 1137 located in the red light-emitting unit 1124, and a green light exciton blocking layer 1138 located in the green light-emitting unit 1125. The light emitting material layer includes a red light emitting layer 1139 , a green light emitting layer 1140 and a blue light emitting layer 1141 .

[0075] Specifically, Figure 4As shown, the first electrode 1127 includes a material with a high work function, and can be specifically prepared by a composite structure of a transparent oxide layer, such as "Ag / ITO" or "Ag / IZO", etc. Preferably, the thickness of the metal layer ranges from 80nm to 100nm, and the thickness of the metal oxide ranges from 5nm to 10nm. The average reflectivity of the first electrode 1127 in the visible light region ranges from 85% to 95%. The hole injection layer 1130 mainly functions to reduce the hole injection barrier and improve the hole injection efficiency. It can be prepared by using materials such as P-type doping materials (such as HATCN) and CuPc to prepare a single-layer film, or it can be prepared by p-doping the hole transport material, such as NPB:F4TCNQ, TAPC:MnO3, etc. The general hole injection layer 1130 has a thickness range of 5nm to 20nm, and a p-doping concentration range of 0.5% to 10%. The hole transport layer 1131 can be prepared by evaporation using a carbazole material with a high hole mobility. The molecular highest occupied orbital (HOMO) energy level of this layer of material needs to be between -5.2eV and -5.6eV. The thickness of this layer ranges from 100nm to 200nm. The thickness of the blue light exciton blocking layer 1136 ranges from 1nm to 10nm, and its main function is to transfer holes, block electrons and excitons generated in the light-emitting material layer 1142. The thickness of the red light exciton blocking layer 1137 ranges from 40nm to 60nm. The thickness of the green light exciton blocking layer 1138 ranges from 15nm to 30nm. The red light emitting layer 1139 includes at least one main material and one doping material, which can be a delayed fluorescent material or a phosphorescent material, and the thickness of the red light emitting layer 1139 ranges from 25nm to 40nm. The green light emitting layer 1140 includes at least one main material and one doping material, which can be a delayed fluorescent material or a phosphorescent material, and the thickness of the green light emitting layer 1140 ranges from 25nm to 40nm. The blue light emitting layer 1141 includes at least one main material and one doping material. The doping material can be a fluorescent material, a delayed fluorescent material or a phosphorescent material. The thickness of the blue light emitting layer 1141 ranges from 15nm to 25nm. The thickness of the hole blocking layer 1133 ranges from 2nm to 10nm. Its main function is to transfer electrons, block holes and excitons generated in the light emitting material layer 1142. The material of the electron transport layer 1134 can include thiophene, imidazole, or azine derivatives, etc., which are prepared by blending with lithium quinoline. The proportion of lithium quinoline can be adjusted in the range of 30% to 70%, and the thickness can be adjusted between 20 and 40nm. The electron injection layer 1135 can be prepared by evaporating 0.5nm to 2nm of LiF, LiQ, Yb, Ca and other materials.The second electrode 1129 can be prepared by evaporating a 10nm to 20nm Mg, Ag, or Al film, or by using an alloy such as Mg:Ag. The preferred Mg:Ag ratio is adjusted between 3:7 and 1:9, and the reference range of the transmittance of the metal film layer at 530nm is 50% to 60%, forming a semi-transparent second electrode. The transparent second electrode 1129 can also be prepared using transparent oxide materials such as ITO, IZO, IGZO, etc.

[0076] In a feasible embodiment, the light regulation layer 12 is capable of passing light in the first band, the second band and the third band, wherein the wavelength of the light in the first band is λ1, 450nm≤λ1≤470nm, the wavelength of the light in the second band is λ2, 510nm≤λ2≤540nm, and the wavelength of the light in the third band is λ3, 615nm≤λ3≤645nm; and the reflectivity of the light regulation layer 12 to light in at least two bands of the first band, the second band and the third band is greater than or equal to 40%.

[0077] In the above embodiment, the light emitted by the blue light-emitting unit 1126 is within the first band, the light emitted by the green light-emitting unit 1125 is within the second band, and the light emitted by the red light-emitting unit 1124 is within the third band. The reflectivity of the light regulating layer 12 to the light in at least two bands of the first band, the second band and the third band is greater than or equal to 40%, so that it can have a light gain effect on at least the light in the two bands, that is, it has a gain effect on the light emitted by the light-emitting units 1121 of at least two colors in the display panel 1, so as to improve the light extraction efficiency of the light-emitting units 1121 of at least two colors, thereby reducing the power consumption of the display panel 1.

[0078] The reflectivity of the light regulating layer 12 to light in the first band, the second band and the third band can be greater than or equal to 40%, thereby having a gain effect on the light emitted by the light-emitting units 1121 of various colors in the display panel 1, so as to further improve the light output efficiency of the display panel 1.

[0079] Specifically, the light regulating layer 12 can convert 50% of the light emitted by the preset light-emitting unit 1121 into circularly polarized light of a first rotation direction, and the other 50% into circularly polarized light of a second rotation direction. The circularly polarized light of the first rotation direction is completely transmitted, and at least 40% of the circularly polarized light of the second rotation direction is reflected, and then completely reflected by the display substrate 11 to be converted into circularly polarized light of the first rotation direction and completely transmitted. Therefore, at least 70% of the light emitted by the preset light-emitting unit 1121 can be emitted, and the light extraction efficiency is greatly improved.

[0080] In a feasible implementation, the light emitting unit 1121 includes a red light emitting unit 1124 for generating light of the third wavelength band, a green light emitting unit 1125 for generating light of the second wavelength band, and a blue light emitting unit 1126 for generating light of the first wavelength band, and the display panel 1 satisfies at least one of the following:

[0081] The first modulation spectrum width of the light regulating layer 12 for the first wavelength band light is W(1), and W(1) is less than twice the half-peak width of the light emission spectrum of the blue light emitting unit 1126;

[0082] The second modulation spectrum width of the light regulating layer 12 for the second wavelength band light is W(2), and W(2) is less than twice the half-peak width of the light emission spectrum of the green light emitting unit 1125;

[0083] The third modulation spectrum width of the light regulating layer 12 for the third wavelength band light is W(3), and W(3) is less than twice the half-peak width of the light emission spectrum of the red light emitting unit 1124 .

[0084] Specifically, when the preset light-emitting unit 1121 includes a blue light-emitting unit 1126, the first modulation spectrum width of the light-regulating layer 12 for the light of the first wavelength band is W(1), and W(1) is less than twice the half-peak width of the light spectrum of the blue light-emitting unit 1126. The width of the first modulation spectrum is the modulation range of the light modulation layer for the light emitted by the blue light-emitting unit 1126, that is, the portion of the light emitted by the blue light-emitting unit 1126 that is within the width of the first modulation spectrum is modulated by the light modulation layer, and the light modulation layer has no modulation effect on the portion of the light emitted by the blue light-emitting unit 1126 that is outside the width of the first modulation spectrum, and this portion of the light can be directly transmitted. The first modulation spectrum width is set to be less than twice the half-peak width of the light spectrum of the blue light-emitting unit 1126, that is, the first modulation spectrum width is set to be smaller, so that a gain effect can be achieved for the light within a smaller range, and the light emitted by the blue light-emitting unit 1126 that passes through the light regulation layer 12 outside the first modulation spectrum width is not adjusted, thereby achieving a better anti-peeping effect.

[0085] Specifically, when the preset light-emitting unit 1121 includes a green light-emitting unit 1125, the second modulation spectrum width of the light-regulating layer 12 for the light of the second wavelength band is W(2), and W(2) is less than twice the half-peak width of the light spectrum of the green light-emitting unit 1125. The width of the second modulation spectrum is the modulation range of the light modulation layer for the light emitted by the green light-emitting unit 1125, that is, the portion of the light emitted by the green light-emitting unit 1125 that is within the width of the second modulation spectrum is modulated by the light modulation layer, and the light modulation layer has no modulation effect on the portion of the light emitted by the green light-emitting unit 1125 that is outside the width of the second modulation spectrum, and this portion of the light can be directly transmitted. The second modulation spectrum width is set to be less than twice the half-peak width of the light spectrum of the green light-emitting unit 1125, that is, the second modulation spectrum width is set to be smaller, so that a gain effect can be achieved for the light within a smaller range, and the light emitted by the green light-emitting unit 1125 that passes through the light regulation layer 12 outside the second modulation spectrum width is not adjusted, thereby achieving a better anti-peeping effect.

[0086] Specifically, when the preset light-emitting unit 1121 includes a red light-emitting unit 1124, the third modulation spectrum width of the light-regulating layer 12 for the third band light is W(3), and W(3) is less than twice the half-peak width of the light spectrum of the red light-emitting unit 1124. The width of the third modulation spectrum is the modulation range of the light modulation layer on the light emitted by the red light-emitting unit 1124, that is, the portion of the light emitted by the red light-emitting unit 1124 that is within the width of the third modulation spectrum is modulated by the light modulation layer, and the light modulation layer has no modulation effect on the portion of the light emitted by the red light-emitting unit 1124 that is outside the width of the third modulation spectrum, and this portion of light can be directly transmitted. The third modulation spectrum width is set to be less than twice the half-peak width of the light spectrum of the green light-emitting unit 1125, that is, the third modulation spectrum width is set to be smaller, so that a gain effect can be achieved for the light within a smaller range, and the light emitted by the red light-emitting unit 1124 that passes through the light regulation layer 12 outside the third modulation spectrum width is not adjusted, thereby achieving a better anti-peeping effect.

[0087] Specifically, the display panel 1 satisfies at least one of the following conditions: the first modulation spectrum width of the light regulation layer 12 for the first band light is W(1), and W(1) is less than twice the half-peak width of the light spectrum of the blue light emitting unit 1126; the second modulation spectrum width of the light regulation layer 12 for the second band light is W(2), and W(2) is less than twice the half-peak width of the light spectrum of the green light emitting unit 1125; the third modulation spectrum width of the light regulation layer 12 for the third band light is W(3), and W(3) is less than twice the half-peak width of the light spectrum of the red light emitting unit 1124. Thus, the display panel 1 has a modulation effect on the light emitted by at least one of the red light emitting unit 1124, the green light unit and the blue light emitting unit 1126, thereby improving the light extraction efficiency and the anti-peeping effect.

[0088] Specifically, the difference between the center wavelength of the first modulation spectrum and the peak wavelength of the emission spectrum of the blue light-emitting unit 1126 is less than 10 nm; and / or, the difference between the center wavelength of the second modulation spectrum and the peak wavelength of the emission spectrum of the green light-emitting unit 1125 is less than 10 nm; and / or, the difference between the center wavelength of the third modulation spectrum and the peak wavelength of the emission spectrum of the red light-emitting unit 1124 is less than 10 nm. This helps to achieve an effective gain effect on the normal viewing angle light.

[0089] Specifically, Figure 5 As shown, Figure 5 A schematic diagram of spectral normalization is shown in the figure. The blue curve is the spectral normalization curve of the light emitted by the blue light-emitting unit, the green curve is the spectral normalization curve of the light emitted by the green light-emitting unit, and the red curve is the spectral normalization curve of the light emitted by the red light-emitting unit. The first modulated spectral width is the spectral width corresponding to a 20% change in the extreme value of the transmittance of the light regulating layer 12 to the light of the first wavelength band. The second modulated spectral width is the spectral width corresponding to a 20% change in the extreme value of the transmittance of the light regulating layer 12 to the light of the second wavelength band. The third modulated spectral width is the spectral width corresponding to a 20% change in the extreme value of the transmittance of the light regulating layer 12 to the light of the third wavelength band. Specifically, taking the second-band light as an example, that is, taking the light emitted by the green light-emitting unit 1125 as an example, the transmittance of the light-regulating layer 12 to the second-band light has a minimum value of 0.5. Therefore, the corresponding transmittance extreme value changes by 20%, which means that the transmittance changes to a large value, and the change of 20% is 120% of the minimum value, which is 0.6. There are multiple intersection points between 0.6 and the transmittance of the light-regulating layer 12. Take two intersection points that satisfy the conditions that the difference between the center wavelength of the second modulation spectrum and the peak wavelength of the emission spectrum of the green light-emitting unit 1125 is less than 10nm, and W(2) is less than twice the half-peak width of the emission spectrum of the green light-emitting unit 1125. The spectral width between the two intersection points is the second modulation spectrum width.

[0090] In a possible implementation, Figure 6 and Figure 7 As shown, the light regulation layer 12 includes at least one of a first cholesteric liquid crystal layer 121, a second cholesteric liquid crystal layer 122 and a third cholesteric liquid crystal layer 123, wherein the first cholesteric liquid crystal layer 121 is used to modulate the light of the first band, the second cholesteric liquid crystal layer 122 is used to modulate the light of the second band, and the third cholesteric liquid crystal layer 123 is used to modulate the light of the third band.

[0091] In the above embodiment, the light regulation layer 12 includes at least one of the first cholesteric liquid crystal layer 121, the second cholesteric liquid crystal layer 122 and the third cholesteric liquid crystal layer 123, so that the light emitted by at least one of the blue light-emitting unit 1126, the green light-emitting unit 1125 and the red light-emitting unit 1124 can be modulated, thereby improving the light extraction efficiency and anti-peeping effect of the display panel 1.

[0092] In a feasible implementation, the first cholesteric liquid crystal layer 121 includes solid first cholesteric liquid crystals, the second cholesteric liquid crystal layer 122 includes solid second cholesteric liquid crystals, and the third cholesteric liquid crystal layer 123 includes solid third cholesteric liquid crystals.

[0093] In the above embodiment, the first cholesteric liquid crystal layer 121 includes a first cholesteric liquid crystal having a solidified handedness and a preset pitch, the second cholesteric liquid crystal layer 122 includes a second cholesteric liquid crystal having a solidified handedness and a preset pitch, and the third cholesteric liquid crystal layer 123 includes a third cholesteric liquid crystal having a solidified handedness and a preset pitch, so that the first cholesteric liquid crystal layer 121 only modulates the light of the first wavelength band, does not modulate and only transmits the light outside the first wavelength band, the second cholesteric liquid crystal layer 122 only modulates the light of the second wavelength band, does not modulate and only transmits the light outside the second wavelength band, and the third cholesteric liquid crystal layer 123 is used to modulate the light of the third wavelength band, does not modulate and only transmits the light outside the third wavelength band.

[0094] In a possible implementation, Figure 6 As shown, the light regulation layer 12 includes a first cholesteric liquid crystal layer 121, a second cholesteric liquid crystal layer 122 and a third cholesteric liquid crystal layer 123 arranged in a direction parallel to the plane where the display panel 1 is located. The first cholesteric liquid crystal layer 121 is located on the side of the blue light-emitting unit 1126 away from the display substrate 11, and is used to modulate the light of the first band. The second cholesteric liquid crystal layer 122 is located on the side of the green light-emitting unit 1125 away from the display substrate 11, and is used to modulate the light of the second band. The third cholesteric liquid crystal layer 123 is located on the side of the red light-emitting unit 1124 away from the display substrate 11, and is used to modulate the light of the third band.

[0095] In the above embodiment, the light regulation layer 12 includes a first cholesteric liquid crystal layer 121, a second cholesteric liquid crystal layer 122, and a third cholesteric liquid crystal layer 123. The first cholesteric liquid crystal layer 121, the second cholesteric liquid crystal layer 122, and the third cholesteric liquid crystal layer 123 are arranged in a direction parallel to the plane where the display panel 1 is located. Specifically, the first cholesteric liquid crystal layer 121 is arranged opposite to the blue light-emitting unit 1126, and the orthographic projection of the first cholesteric liquid crystal layer 121 on the display substrate 11 covers the blue light-emitting unit 1126. The second cholesteric liquid crystal layer 122 is arranged opposite to the green light-emitting unit 1125, and the orthographic projection of the second cholesteric liquid crystal layer 122 on the display substrate 11 covers the green light-emitting unit 1125. The third cholesteric liquid crystal layer 123 is arranged opposite to the red light-emitting unit 1124, and the orthographic projection of the second cholesteric liquid crystal layer 122 on the display substrate 11 covers the red light-emitting unit 1124.

[0096] In another possible implementation, if Figure 7 As shown, the light regulation layer 12 includes a first cholesteric liquid crystal layer 121 , a second cholesteric liquid crystal layer 122 and a third cholesteric liquid crystal layer 123 which are stacked along the thickness direction of the display panel 1 .

[0097] In the above embodiment, since the cholesteric liquid crystal layer only modulates the light in a specific wavelength band, and does not modulate but only transmits the light outside the specific wavelength band, that is, after the orthographic projection of the first cholesteric liquid crystal layer 121 on the display substrate 11 covers the red light emitting unit 1124, the light emitted by the red light emitting unit 1124 is not modulated but only transmitted, the first cholesteric liquid crystal layer 121, the second cholesteric liquid crystal layer 122 and the third cholesteric liquid crystal layer 123 can be stacked along the thickness direction of the display panel 1. In the structure of the light regulation layer 12, the first cholesteric liquid crystal layer 121, the second cholesteric liquid crystal layer 122 and the third cholesteric liquid crystal layer 123 can all be prepared as a whole layer, and the preparation difficulty is relatively low. Specifically, the relative positions of the first cholesteric liquid crystal layer 121, the second cholesteric liquid crystal layer 122 and the third cholesteric liquid crystal layer 123 along the thickness direction of the display panel 1 are not particularly limited in this application. The first cholesteric liquid crystal layer 121, the second cholesteric liquid crystal layer 122 and the third cholesteric liquid crystal layer 123 can be arranged in sequence in a direction away from the display substrate 11, or the third cholesteric liquid crystal layer 123, the second cholesteric liquid crystal layer 122 and the first cholesteric liquid crystal layer 121 can be arranged in sequence in a direction away from the display substrate 11, or the second cholesteric liquid crystal layer 122 can be arranged adjacent to one of the first cholesteric liquid crystal layer 121 and the third cholesteric liquid crystal layer 123, adjacent to the other, etc., and this application does not make any special restrictions on this.

[0098] In a possible implementation, Figure 1 and Figure 2As shown, the phase retardation layer 131 includes a quarter phase retarder, and the circularly polarized light of the first rotation direction has obvious circular polarization characteristics, that is, after applying the quarter phase retarder, the ratio of parallel brightness to orthogonal brightness is greater than 5 under the polarization cross extinction test.

[0099] In a feasible implementation manner, the transmittance of the linear polarization layer 132 to light in the wavelength range of 460 nm to 630 nm is greater than or equal to 40%.

[0100] In the above embodiment, the linear polarization layer 132 has non-positive wavelength dispersion, and the transmittance of the linear polarization layer 132 in the wavelength range of 460nm to 630nm is not less than 40%, thereby improving the light extraction efficiency of the display panel 1.

[0101] In a possible implementation, Figure 8 As shown, the anti-reflection layer 13 further includes at least one light absorbing layer 133, and the light absorbing layer 133 is located on the side of the linear polarization layer 132 away from the phase retardation layer 131. The light absorbing layer 133 can be used to absorb light incident from the outside to the inside of the display panel 1, thereby reducing the reflectivity of the display panel 1 to the outside light, so as to achieve an anti-reflection effect.

[0102] In a feasible implementation, the light absorbing layer 133 can absorb light with a wavelength less than or equal to 450 nm.

[0103] In the above embodiment, in order to improve the light extraction efficiency of the display panel 1, it is necessary to reduce the absorption rate of the light absorbing layer 133 to the light emitted by the light emitting unit 1121. The wavelength of the light emitted by the light emitting unit 1121 is greater than 450nm. Therefore, the light absorbing layer 133 can be capable of absorbing light with a wavelength less than or equal to 450nm, so as to reduce the absorption rate of the light emitted by the light emitting unit 1121 while ensuring the absorption rate of external light.

[0104] In a possible implementation, Figure 8 As shown, the light emitting layer 112 further includes a pixel defining portion 1122 , the pixel defining portion 1122 includes a plurality of pixel openings 1123 , the light emitting unit 1121 is located in the pixel opening 1123 , and the material of the pixel defining portion 1122 includes a light shielding material.

[0105] In the above embodiment, the pixel defining portion 1122 can be used to define the light emitting unit 1121. Specifically, the pixel defining portion 1122 is provided on the entire surface and includes a plurality of pixel openings 1123. The light emitting unit 1121 is located in the pixel openings 1123. The material of the pixel defining portion 1122 includes a light shielding material, so that the large-angle light emitted by the light emitting unit 1121 can be absorbed, thereby further improving the anti-peeping effect.

[0106] In a feasible implementation manner, the absorbance of the pixel defining portion 1122 to light with a wavelength in the range of 430 nm to 700 nm is greater than or equal to 3.0 / μm.

[0107] In the above embodiment, the wavelength range of 430nm to 700nm covers the light emission wavelength range of the red light emitting unit 1124, the green light emitting unit 1125 and the blue light emitting unit 1126, that is, the pixel limiting portion 1122 can absorb the large-angle light emitted by any one of the red light emitting unit 1124, the green light emitting unit 1125 and the blue light emitting unit 1126.

[0108] In the above embodiment, the absorbance of the pixel defining portion 1122 is greater than or equal to 3.0 / μm, so that a better light absorption effect can be achieved to reduce the emission rate of light at a large viewing angle.

[0109] Specifically, the absorbance of the pixel defining portion 1122 may be 3.0 / μm, 3.1 / μm, 3.7 / μm, 3.9 / μm, 4.0 / μm, 5.0 / μm, or the like.

[0110] In a feasible implementation manner, the cross section of the pixel defining portion 1122 along the thickness direction of the base substrate 111 is a trapezoid, and the bottom angle s of the trapezoid is less than or equal to 35°.

[0111] In the above embodiment, the cross section of the pixel defining portion 1122 along the thickness direction of the base substrate 111 is a trapezoid, so that the outer diameter of the cross section of the pixel opening 1123 parallel to the thickness direction of the display panel 1 gradually increases in the direction away from the display substrate 11. The bottom angle of the trapezoid is less than or equal to 35°, which can make the slope of the side wall of the pixel opening 1123 more gentle, which helps to improve the continuity of the film layer located on the side of the pixel defining portion 1122 away from the display substrate 11, thereby improving the manufacturing yield.

[0112] In a possible implementation, Fig. 9 As shown, it also includes a light blocking layer 14, which is located between the display substrate 11 and the light regulating layer 12, and the orthographic projection of the light blocking layer 14 on the base substrate 111 is located within the orthographic projection of the pixel defining portion 1122 on the base substrate 111.

[0113] In the above embodiment, the orthographic projection of the light blocking layer 14 on the display substrate 11 is located between adjacent light emitting units 1121. On the one hand, it can prevent the light blocking layer 14 from blocking the pixel opening 1123 and the light emitting unit 1121 in the pixel opening 1123. On the other hand, it can prevent color crosstalk between adjacent light emitting units 1121. The light blocking layer 14 is used to absorb the large-angle light emitted by the light emitting unit 1121 to reduce the emission rate of the large-viewing-angle light, thereby further improving the anti-peeping effect of the display panel 1.

[0114] Specifically, when the display panel 1 includes the light blocking layer 14, the pixel defining portion 1122 may be made of a light blocking material or a light transmitting material. When the pixel defining portion 1122 is made of a light blocking material, the anti-peeping effect can be further improved, and when the pixel defining portion 1122 is made of a light transmitting material, the manufacturing cost can be reduced. When both the light blocking layer 14 and the pixel defining portion 1122 are made of a light blocking material, the same light blocking material can be used, thereby simplifying the manufacturing process and reducing the manufacturing cost.

[0115] In a possible implementation, Fig. 9 As shown, in the first direction, the distance between the orthographic projection boundary of the light blocking layer 14 on the base substrate 111 and the orthographic projection boundary of the corresponding pixel limiting portion 1122 on the base substrate 111 is a first distance x1, the width of the pixel opening 1123 adjacent to the light blocking layer 14 along the first direction is a preset width x2, the ratio of the first distance x1 to the preset width x2 is less than or equal to one quarter, and the first direction is the direction from the pixel opening 1123 on one side of the light blocking layer 14 to the pixel opening 1123 on the other side.

[0116] In the above embodiment, the ratio of the first distance to the preset width is less than or equal to one quarter, and the first distance is greater than or equal to 0, so that the first distance can be controlled to be smaller, so as to enhance the control of the light-emitting effect of the light-emitting unit 1121 in the two adjacent pixel openings 1123 by the light-blocking layer 14, so that the light-blocking layer 14 can better absorb the wide-angle light emitted by the light-emitting unit 1121 in the two adjacent pixel openings 1123, thereby further enhancing the anti-peeping effect.

[0117] Specifically, Fig.10 As shown, among the shielding layer 14 and the two adjacent pixel openings 1123, the width of the right pixel opening 1123 along the first direction is a preset width x21, and the distance between the orthographic projection boundary of the light blocking layer 14 on the substrate 111 and the orthographic projection boundary of the pixel defining portion 1122 on the right side on the substrate 111 is a first distance x11, and x11 is less than or equal to x21 / 4. The width of the left pixel opening 1123 along the first direction is a preset width x22, and the distance between the orthographic projection boundary of the light blocking layer 14 on the substrate 111 and the orthographic projection boundary of the pixel defining portion 1122 on the left side on the substrate 111 is a first distance x12, and x12 is less than or equal to x22 / 4. In a feasible embodiment, the absorbance of the light blocking layer 14 to light with a wavelength in the range of 430nm to 700nm is greater than or equal to 3.0 / μm.

[0118] In the above embodiment, the wavelength range of 430nm to 700nm covers the light emission wavelength range of the red light emitting unit 1124, the green light emitting unit 1125 and the blue light emitting unit 1126, that is, the light blocking layer 14 can absorb the large-angle light emitted by any one of the red light emitting unit 1124, the green light emitting unit 1125 and the blue light emitting unit 1126.

[0119] In the above embodiment, the absorbance of the light blocking layer 14 is greater than or equal to 3.0 / μm, so that a better light absorption effect can be achieved to reduce the emission rate of light with a large viewing angle.

[0120] Specifically, the absorbance of the light blocking layer 14 may be 3.0 / μm, 3.3 / μm, 3.4 / μm, 3.7 / μm, 4.0 / μm, 6.0 / μm, and so on.

[0121] In a possible implementation, Fig.10 As shown, the light blocking layer 14 includes a plurality of light blocking portions 141, and the plurality of light blocking portions 141 are dispersedly arranged between adjacent pixel openings 1123; or, as shown Fig.11 As shown, the orthographic projection of the light blocking layer 14 on the base substrate 111 is a mesh structure.

[0122] In the above embodiment, the light blocking portion 141 may be a block structure, and the light blocking portion 141 is located between adjacent pixel openings 1123, specifically including being located between adjacent pixel openings 1123 along a first direction and / or between adjacent pixel openings 1123 along a second direction, wherein the first direction and the second direction intersect.

[0123] In the above embodiment, the orthographic projection of the light blocking layer 14 on the base substrate 111 can also be a mesh structure, which includes a plurality of openings, and the orthographic projections of the openings on the display substrate 11 expose the pixel openings 1123 to avoid the orthographic projection of the light blocking layer 14 on the display substrate 11 overlapping with the light-emitting unit 1121 and affecting the light output effect.

[0124] In a possible implementation, Fig. 9 As shown, the cross section of the light blocking layer 14 along the thickness direction of the base substrate 111 is a first trapezoid, the cross section of the pixel defining portion 1122 along the thickness direction of the base substrate 111 is a second trapezoid, and the bottom angle k of the first trapezoid is greater than or equal to the bottom angle s of the second trapezoid.

[0125] In the above embodiment, the slope angle of the light blocking layer 14 is greater than or equal to the slope angle of the pixel defining portion 1122, thereby preventing the light blocking layer 14 from blocking the small viewing angle light output effect and affecting the light output efficiency.

[0126] In a possible implementation, Fig. 9As shown, a planar layer 15 is also included. The planar layer 15 is located on the side of the light blocking layer 14 away from the light emitting layer 112 .

[0127] In the above embodiment, the planarization layer 15 may be made of a light-transmitting organic material, and the planarization layer 15 is used to planarize the light-blocking layer 14 so as to improve the preparation yield of subsequent film layers.

[0128] In another possible implementation, if Fig.12 As shown, the display panel 1 does not have a light blocking layer 14 , but only has a planarization layer 15 . The planarization layer 15 is located between the display substrate 11 and the light regulating layer 12 , and is used to achieve planarization to improve the preparation yield of the light regulating layer 12 .

[0129] As shown in Table 1, the present application is illustrated by 4 embodiments combined with 2 comparative examples:

[0130] Comparative Example 1

[0131] like Fig.13 As shown, the light-emitting layer 112 of the display panel 1 includes a plurality of light-emitting units 1121, the plurality of light-emitting units 1121 include a red light-emitting unit 1124, a green light-emitting unit 1125 and a blue light-emitting unit 1126, and also includes a pixel defining portion 1122, the pixel defining portion 1122 includes a plurality of pixel openings 1123, the light-emitting unit 1121 is located in the pixel opening 1123, and the pixel defining portion 1122 is made of a transparent material. It also includes a flat layer 15 and an anti-reflection layer 13 stacked in a direction away from the display substrate 11, wherein the display panel 1 does not include a light-blocking layer 14 or a light-regulating layer 12. In this embodiment, the brightness reduction of the light at a large viewing angle is achieved only by natural attenuation. As can be seen from Table 1, the brightness of white light at a positive viewing angle is 100%, and the brightness of white light at a large viewing angle (0°, 30°) is 77%.

[0132] Embodiment 1

[0133] like Fig.12As shown, the light-emitting layer 112 of the display panel 1 includes a plurality of light-emitting units 1121, and the plurality of light-emitting units 1121 include a red light-emitting unit 1124, a green light-emitting unit 1125, and a blue light-emitting unit 1126, and also includes a pixel defining portion 1122, the pixel defining portion 1122 includes a plurality of pixel openings 1123, the light-emitting units 1121 are located within the pixel openings 1123, and the pixel defining portion 1122 is made of a transparent material. It also includes a flat layer 15, a light regulating layer 12, and an anti-reflection layer 13 stacked in a direction away from the display substrate 11, wherein the display panel 1 does not include a light blocking layer 14. The difference between this embodiment and comparative example 1 is that: in this embodiment, a light regulating layer 12 is provided, and the anti-peeping effect of the display panel 1 is achieved only by the light regulating layer 12. In addition, in this embodiment one, an optical regulating layer having a modulation effect on the red light-emitting unit 1124, the green light-emitting unit 1125, and the blue light-emitting unit 1126 is used, as shown in Tables 1 and Fig.14 As shown, Fig.14 The red curve represents the corresponding curve of viewing angle and brightness of comparative example 1, and the blue curve represents the corresponding curve of viewing angle and brightness of embodiment 1. Under the same driving power condition as comparative example 1, the brightness of the white light at the positive viewing angle in embodiment 1 is 140%, which is significantly improved compared with comparative example 1, that is, the brightness of the light output at the positive viewing angle is improved by the light regulation layer 12. As shown in Table 1, at a large viewing angle (0°, 30°), the brightness of the white light is 59%, which is a certain degree of decrease compared with comparative example 1. Fig.15 As shown, Fig.15 is the normalized peak brightness and viewing angle corresponding curve, Fig.15 The red curve represents the viewing angle and brightness corresponding curve of comparative example 1, and the blue curve represents the viewing angle and brightness corresponding curve of embodiment 1. As the viewing angle increases, the panel brightness decreases more dramatically than comparative example 1, so it has certain anti-peeping characteristics, that is, the light regulation layer 12 improves the attenuation efficiency of light at a large viewing angle, thereby helping to improve the anti-peeping effect.

[0134] Embodiment 2

[0135] like Fig.12 As shown, the structure of the display panel 1 in this embodiment is basically the same as the structure of the display panel 1 in the first embodiment, and the difference lies in the first modulation spectrum width, the second modulation spectrum width and the third modulation spectrum width in the light regulation layer 12. The same or similar points between the second embodiment and the first embodiment will not be repeated here.

[0136] In this embodiment, the first modulation spectrum width is reduced by 6nm compared with the first modulation spectrum width in the first embodiment, the second modulation spectrum width is reduced by 9nm compared with the second modulation spectrum width in the first embodiment, and the third modulation spectrum width is reduced by 13nm compared with the third modulation spectrum width in the first embodiment. It can be seen from Table 1 that the brightness of the light output at the normal viewing angle in this embodiment is the same as that in the first embodiment, and the attenuation at a large viewing angle is increased compared with that in the first embodiment, that is, the brightness at a large viewing angle is further reduced, and the anti-peeping effect is further improved. That is, the anti-peeping effect of the display panel 1 can be further improved by reducing the first modulation spectrum width, the second modulation spectrum width, and the third modulation spectrum width.

[0137] Embodiment 3

[0138] like Fig. 9 As shown, the structure of the display panel 1 in this embodiment is basically the same as the structure of the display panel 1 in the second embodiment, the difference is that a light blocking layer 14 is added between the display substrate 11 and the light modulation layer, and the same or similar points between the third embodiment and the second embodiment are not repeated here.

[0139] The light-blocking layer 14 has light-absorbing properties, and the average absorbance in the visible light band is 3.5 / μm. The orthographic projection of the flat layer 15 on the display substrate 11 covers the orthographic projection of the light-blocking layer 14 on the display substrate 11. In the first direction, the distance between the orthographic projection boundary of the light-blocking layer 14 on the base substrate 111 and the orthographic projection boundary of the corresponding pixel defining portion 1122 on the base substrate 111 is the first distance, and the first direction is the direction from the pixel opening 1123 on one side of the light-blocking layer 14 to the pixel opening 1123 on the other side. The first distance is 2μm. In combination with Table 1, it can be seen that the brightness of the wide-angle white light in this embodiment is further reduced compared with that in the second embodiment, thereby further improving the anti-peeping effect, that is, the anti-peeping effect of the display panel 1 is improved by setting the light-blocking layer 14.

[0140] Embodiment 4

[0141] like Fig. 9 As shown, the structure of the display panel 1 in this embodiment is basically the same as that of the display panel 1 in the third embodiment, except that the first distance in this embodiment is 0.5 μm. The same or similar points between the fourth embodiment and the third embodiment are not repeated here.

[0142] It can be seen from Table 1 that the brightness of the wide-viewing angle white light in this embodiment is further reduced compared with that in the third embodiment, so that the anti-peeping effect can be further improved. That is, the anti-peeping effect of the display panel 1 can be further improved by reducing the first distance.

[0143] Comparative Example 2

[0144] like Fig.16As shown, the structure of the display panel 1 in this comparative example is basically the same as the structure of the display panel 1 in Example 3, the difference being that the light regulating layer 12 is not provided in this comparative example, and the similarities or similarities between Comparative Example 2 and Example 3 are not repeated here.

[0145] From Table 1, it can be seen that the brightness of the light at a positive viewing angle of this comparative example is lower than that of Example 3, while the brightness of the white light at a wide viewing angle is increased, which can further prove the gain effect of the light modulation layer on the positive viewing angle light and the attenuation effect on the wide viewing angle light.

[0146]

[0147] Table 1 Comparison table of examples and comparative examples

[0148] In a possible implementation, Fig.17 As shown, the display substrate 11 further includes an encapsulation layer 16 and a touch control layer 17 which are sequentially stacked on a side of the light emitting layer 112 away from the base substrate 111 .

[0149] In the above embodiment, the encapsulation layer 16 is used to encapsulate the light emitting unit 1121 to reduce the adverse effects of water and oxygen on the light emitting unit 1121 , thereby helping to improve the light output yield of the light emitting unit 1121 and helping to improve the service life of the display panel 1 .

[0150] Specifically, the encapsulation layer 16 includes an inorganic layer and an organic layer 162 stacked in a direction away from the display substrate 11, and the orthographic projection of the organic layer 162 on the base substrate 111 is located within the orthographic projection of the inorganic layer on the base substrate 111. The inorganic layer has a better performance in isolating water and oxygen, and the organic layer 162 has a better ductility. The stacking of the inorganic layer and the organic layer 162 can improve the encapsulation yield.

[0151] Specifically, the encapsulation layer 16 includes a plurality of stacked film layers, and at least two of the film layers have a refractive index greater than 1.65.

[0152] Specifically, Fig.18 As shown, the encapsulation layer 16 may include a first inorganic layer 161 , an organic layer 162 , and a second inorganic layer 163 stacked in a direction away from the display substrate 11 .

[0153] In the above embodiment, a touch layer 17 is further included, so that the touch function of the display panel 1 can be realized. The encapsulation layer 16 is located between the touch layer 17 and the light-emitting layer 112 to achieve a good encapsulation effect for the light-emitting unit 1121, and the touch layer 17 is located on the side of the encapsulation layer 16 away from the light-emitting unit 1121 to avoid adverse effects of the preparation of the touch layer 17 on the light-emitting unit 1121.

[0154] In a possible implementation, Fig.19As shown, the display substrate 11 also includes a light extraction layer 18 (Capping Layer), which is located between the light emitting layer 112 and the encapsulation layer 16. The encapsulation layer 16 includes a first inorganic layer 161 close to the light emitting layer 112. The difference between the refractive index of the light extraction layer 18 and the refractive index of the first inorganic layer 161 is greater than 0.1, and the refractive index of the light extraction layer 18 is greater than the refractive index of the first inorganic layer 161.

[0155] In the above embodiment, the light extraction layer 18 is located between the light emitting layer 112 and the encapsulation layer 16, that is, the light extraction layer 18 is located on the side of the second electrode 1129 away from the first electrode 1127, and can be used to protect the second electrode 1129. The light extraction layer 18 has a relatively high refractive index, and the refractive index difference between the light extraction layer 18 and the adjacent first inorganic layer 161 in the encapsulation layer 16 is greater than 0.1, which helps to improve the light extraction efficiency of the light emitting unit 1121.

[0156] The present application also provides a display device 2, such as Fig. 20 As shown, it includes any one of the display panels 1 provided in the above embodiments of the present application.

[0157] In the display device 2, the light emitting efficiency of the normal viewing angle light is high, so that the brightness of the display device 2 can be improved, the power consumption of the display device can be reduced, and it is helpful to achieve energy conservation and emission reduction, and the light emitting efficiency of the large viewing angle light is low, and the brightness and contrast are also low, so it has a good anti-peeping effect. Thus, low power consumption and better anti-peeping effect are achieved, which helps to improve user experience.

[0158] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A display panel, characterized in that: include: A display substrate, comprising a base substrate and a light-emitting layer located on one side of the base substrate, wherein the light-emitting layer comprises a light-emitting unit; a light regulation layer, located on a side of the light-emitting layer away from the base substrate, the light regulation layer being used to convert the light emitted by the light-emitting unit into a first-handed circularly polarized light that can pass through the light regulation layer and a second-handed circularly polarized light that is reflected by the light regulation layer toward the display substrate, so that the display substrate reflects the second-handed circularly polarized light as the first-handed circularly polarized light and passes through the light regulation layer, the first-handed circularly polarized light and the second-handed circularly polarized light have opposite hand directions, and the light regulation layer modulates the light emitted by the preset light-emitting unit with a spectrum width that is less than twice the half-peak width of the light spectrum of the preset light-emitting unit; An anti-reflection layer is located on the side of the light regulating layer away from the light emitting layer, and the anti-reflection layer includes a phase delay layer and a linear polarization layer stacked in a direction away from the light regulating layer, and the phase delay layer is used to convert the first-hand circularly polarized light into a first linearly polarized light, and the transmission axis direction of the linear polarization layer is parallel to the vibration direction of the first linearly polarized light.

2. The display panel according to claim 1, characterized in that: The light regulation layer can pass light in the first band, the second band and the third band, wherein the wavelength of the light in the first band is λ1, 450nm≤λ1≤470nm, the wavelength of the light in the second band is λ2, 510nm≤λ2≤540nm, and the wavelength of the light in the third band is λ3, 615nm≤λ3≤645nm; and the reflectivity of the light regulation layer to light in at least two bands of the first band, the second band and the third band is greater than or equal to 40%.

3. The display panel according to claim 1, characterized in that: The light regulating layer includes a cholesteric liquid crystal material having a microscopic spiral structure.

4. The display panel according to claim 2, characterized in that: The light-emitting unit includes a red light-emitting unit for generating light of a third wavelength band, a green light-emitting unit for generating light of a second wavelength band, and a blue light-emitting unit for generating light of a first wavelength band, and the display panel satisfies at least one of the following: The first modulation spectrum width of the light regulating layer for the light of the first wavelength band is W(1), and W(1) is less than twice the half-peak width of the light emission spectrum of the blue light emitting unit; The second modulation spectrum width of the light regulating layer for the second wavelength band light is W(2), and W(2) is less than twice the half-peak width of the light emission spectrum of the green light emitting unit; The third modulation spectrum width of the light regulating layer for the third wavelength band light is W(3), and W(3) is less than twice the half-peak width of the light emission spectrum of the red light emitting unit.

5. The display panel according to claim 4, characterized in that: The light regulation layer includes at least one of a first cholesteric liquid crystal layer, a second cholesteric liquid crystal layer and a third cholesteric liquid crystal layer, wherein the first cholesteric liquid crystal layer is used to modulate the light of the first band, the second cholesteric liquid crystal layer is used to modulate the light of the second band, and the third cholesteric liquid crystal layer is used to modulate the light of the third band.

6. The display panel according to claim 5, characterized in that: The first cholesteric liquid crystal layer includes a first cholesteric liquid crystal in a solid state, the second cholesteric liquid crystal layer includes a second cholesteric liquid crystal in a solid state, and the third cholesteric liquid crystal layer includes a third cholesteric liquid crystal in a solid state.

7. The display panel according to claim 5, characterized in that: The light regulation layer includes a first cholesteric liquid crystal layer, a second cholesteric liquid crystal layer and a third cholesteric liquid crystal layer arranged in a direction parallel to the plane where the display panel is located, the first cholesteric liquid crystal layer is located on the side of the blue light emitting unit away from the display substrate, and is used to modulate the light of the first wavelength band, the second cholesteric liquid crystal layer is located on the side of the green light emitting unit away from the display substrate, and is used to modulate the light of the second wavelength band, and the third cholesteric liquid crystal layer is located on the side of the red light emitting unit away from the display substrate, and is used to modulate the light of the third wavelength band; Alternatively, the light regulating layer includes a first cholesteric liquid crystal layer, a second cholesteric liquid crystal layer and a third cholesteric liquid crystal layer stacked along the thickness direction of the display panel.

8. The display panel according to claim 1, characterized in that: The phase retarder layer includes a quarter phase retarder.

9. The display panel according to claim 1, characterized in that: The transmittance of the linear polarization layer to light in the wavelength range of 460nm to 630nm is greater than or equal to 40%.

10. The display panel according to claim 1, characterized in that: Therefore, the anti-reflection layer further includes at least one light absorbing layer, and the light absorbing layer is located on the side of the linear polarization layer away from the phase retardation layer.

11. The display panel according to claim 10, characterized in that: The light absorbing layer can absorb light with a wavelength less than or equal to 450 nm.

12. The display panel according to claim 1, characterized in that: The light emitting layer further includes a pixel defining portion, the pixel defining portion includes a plurality of pixel openings, the light emitting unit is located in the pixel openings, and the material of the pixel defining portion includes a light shielding material.

13. The display panel according to claim 12, characterized in that: The absorbance of the pixel defining portion to light with a wavelength in a range of 430 nm to 700 nm is greater than or equal to 3.0 / μm.

14. The display panel according to claim 12, characterized in that: The cross section of the pixel defining portion along the thickness direction of the base substrate is a trapezoid, and the bottom angle of the trapezoid is less than or equal to 35°.

15. The display panel according to claim 12, characterized in that: It also includes a light blocking layer, which is located between the display substrate and the light regulating layer, and the orthographic projection of the light blocking layer on the base substrate is located within the orthographic projection of the pixel defining portion on the base substrate.

16. The display panel according to claim 15, characterized in that: In a first direction, the distance between the orthographic projection boundary of the light blocking layer on the base substrate and the orthographic projection boundary of the corresponding pixel defining portion on the base substrate is a first distance, the width of the pixel opening adjacent to the light blocking layer along the first direction is a preset width, the ratio of the first distance to the preset width is less than or equal to one quarter, and the first direction is the direction from the pixel opening on one side of the light blocking layer to the pixel opening on the other side.

17. The display panel according to claim 15, characterized in that: The light-blocking layer has an absorbance greater than or equal to 3.0 / μm for light with a wavelength in the range of 430 nm to 700 nm.

18. The display panel according to claim 15, characterized in that: The light blocking layer includes a plurality of light blocking portions, and the plurality of light blocking portions are dispersedly arranged between adjacent pixel openings; or, the orthographic projection of the light blocking layer on the base substrate is a mesh structure.

19. The display panel according to claim 15, characterized in that: The cross section of the light blocking layer along the thickness direction of the base substrate is a first trapezoid, the cross section of the pixel defining portion along the thickness direction of the base substrate is a second trapezoid, and the bottom angle of the first trapezoid is greater than or equal to the bottom angle of the second trapezoid.

20. The display panel according to claim 15, characterized in that: The invention also includes a flat layer, wherein the flat layer is located on a side of the light blocking layer away from the light emitting layer.

21. The display panel according to claim 1, characterized in that: The display substrate further includes an encapsulation layer and a touch control layer which are sequentially stacked on a side of the light emitting layer away from the base substrate.

22. The display panel according to claim 21, characterized in that: The display substrate also includes a light extraction layer, which is located between the light emitting layer and the encapsulation layer. The encapsulation layer includes a first inorganic layer close to the light emitting layer. The difference between the refractive index of the light extraction layer and the refractive index of the first inorganic layer is greater than 0.1, and the refractive index of the light extraction layer is greater than the refractive index of the first inorganic layer.

23. A display device, characterized in that: A display panel comprising any one of claims 1-22.

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