Display substrate and display device

Abstract

The present disclosure provides a display substrate and a display device. The display substrate includes a substrate and a plurality of pixel units located on the substrate, each pixel unit includes a plurality of sub-pixels, the pixel unit includes a target pixel unit, the target pixel unit includes a target sub-pixel, the target sub-pixel includes a pixel driving circuit and a light-emitting unit capable of emitting light under the drive of the pixel driving circuit, and the target sub-pixel also includes a photoresistor, the photoresistor is electrically connected to the pixel driving circuit, and the resistance of the photoresistor increases as the light intensity decreases. The pixel driving circuit of the present disclosure includes a photoresistor, the resistance of the photoresistor decreases as the light intensity increases, and since the luminous efficiency of sub-pixels of different colors at different brightnesses is different, by setting the photoresistor to provide different resistance values ​​under different brightness conditions, the resistance is adjusted, which helps to balance the luminous efficiency of sub-pixels of different colors at different brightnesses, thereby helping to improve the display effect.

Description

Technical Field

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

[0002] OLED (Organic light-emitting diode) display technology has the advantages of high brightness, low power consumption, fast response, high clarity, etc. With the development and maturity of OLED (Organic light-emitting diode) display technology, OLED display devices are becoming more and more popular among users. Summary of the invention

[0003] In a first aspect, an embodiment of the present disclosure provides a display substrate, comprising a substrate and a plurality of pixel units located on the substrate, each of the pixel units comprising a plurality of sub-pixels, the pixel unit comprising a target pixel unit, the target pixel unit comprising a target sub-pixel, the target sub-pixel comprising a pixel driving circuit and a light-emitting unit capable of emitting light under the drive of the pixel driving circuit, the target sub-pixel also comprising a photoresistor, the photoresistor being electrically connected to the pixel driving circuit, and the resistance of the photoresistor increases as the light intensity decreases.

[0004] Optionally, the resistance of the photoresistor decreases as the light intensity increases.

[0005] Optionally, the light-emitting unit of the target sub-pixel includes a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode, and a material of the light-emitting layer includes a phosphorescent light-emitting material.

[0006] Optionally, the sub-pixels of the pixel unit include a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the target sub-pixel includes at least one of a red sub-pixel and a green sub-pixel.

[0007] Optionally, the target sub-pixel also includes a blue sub-pixel, wherein, under the same light intensity, the resistance of the photoresistor included in the blue sub-pixel is smaller than the resistance of the photoresistors corresponding to the red sub-pixel and the green sub-pixel in the same target pixel unit.

[0008] Optionally, the display substrate includes a display area and a non-display area, the display area has a power signal line, the power signal line extends along a first direction, the power signal line has an input end and an output end located in the non-display area, the target pixel unit includes a first target pixel unit and a second target pixel unit, and a distance between the first target pixel unit and the input end of the power signal line in the first direction is smaller than a distance between the second target pixel unit and a target edge of the display substrate;

[0009] Among them, the first target pixel unit includes a first target sub-pixel, the second target pixel unit includes a second target sub-pixel, the first target sub-pixel and the second target sub-pixel have the same luminous color, and under the same light intensity, the resistance value of the photoresistor corresponding to the first target sub-pixel is greater than the resistance value of the photoresistor corresponding to the second target sub-pixel.

[0010] Optionally, the display substrate includes a first display area and a second display area, the distance between the first display area and the input end of the power signal line along the first direction is smaller than the distance between the second display area and the target edge of the display substrate, the pixel units in the first display area are all the first target pixel units, and the pixel units in the second display area are all the second target pixel units.

[0011] Optionally, the light-emitting unit of the target sub-pixel includes a first electrode, a light-emitting layer and a second electrode, the first electrode includes a first part connected to the pixel driving circuit and a second part connected to the light-emitting layer, the photoresistor and the first electrode are integrally arranged, and the orthographic projection of the photoresistor on the substrate is separated from the orthographic projection of the first part on the substrate, and the orthographic projection of the photoresistor on the substrate is separated from the orthographic projection of the second part on the substrate.

[0012] Optionally, the first electrode also includes a third part, which is located between the first part and the second part and is connected to both the first part and the second part, the third part includes a first sub-pattern and a second sub-pattern that are spaced apart, the first sub-pattern is connected to the first part, the second sub-pattern is connected to the second part, the first sub-pattern and the second sub-pattern are both connected to the photosensitive layer, the resistivity of the photosensitive material of the photosensitive layer increases with decreasing light intensity, and the photosensitive layer, the first sub-pattern and the second sub-pattern form the photoresistor.

[0013] Optionally, the first sub-graph includes a plurality of first tooth-like structures, the second sub-graph includes a plurality of second tooth-like structures, the first tooth-like structures and the second tooth-like structures are alternately arranged, the photosensitive layer is located on a side of the first electrode away from the substrate, and the orthographic projection of the photosensitive layer on the substrate overlaps with the orthographic projections of the first tooth-like structures and the second tooth-like structures on the substrate.

[0014] Optionally, the orthographic projection of the photosensitive layer on the substrate is separated from the orthographic projection of the first sub-pattern excluding the first tooth-like structure on the substrate, and the orthographic projection of the photosensitive layer on the substrate is separated from the orthographic projection of the second sub-pattern excluding the second tooth-like structure on the substrate.

[0015] Optionally, the first electrode further includes a fourth part, the fourth part is connected to the first part and the second part respectively, and the fourth part is connected in parallel with the third part.

[0016] Optionally, the display substrate further comprises a pixel defining layer and an opaque isolation structure located on a side of the first electrode away from the substrate, wherein the isolation structure is arranged on the same layer as the pixel defining layer and is located on a side of the light-emitting layer of the photoresistor corresponding to the target sub-pixel away from the target sub-pixel.

[0017] Optionally, the light-emitting layer of the target sub-pixel includes a first surface close to the substrate and a second surface far from the substrate, and an orthographic projection of the first surface on the substrate is located inside an orthographic projection of the second surface on the substrate;

[0018] The orthographic projection of the second surface on the substrate overlaps with the orthographic projection of the photoresistor corresponding to the target sub-pixel on the substrate, and the orthographic projection of the first surface on the substrate is separated from the orthographic projection of the photoresistor corresponding to the target sub-pixel on the substrate.

[0019] In a second aspect, an embodiment of the present disclosure provides a display device, comprising the display substrate described in any one of the first aspects.

[0020] The pixel driving circuit of the disclosed embodiment includes a photoresistor, the resistance of which decreases as the light intensity increases. Since the luminous efficiency of sub-pixels of different colors at different brightnesses is different, the photoresistor is set to provide different resistance values ​​under different brightness conditions, thereby achieving resistance adjustment, which helps to balance the luminous efficiency of sub-pixels of different colors at different brightnesses, thereby helping to improve the display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the description of the embodiments of the present disclosure will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a circuit diagram of a target pixel unit in an embodiment of the present disclosure;

[0023] Figure 2 It is a schematic diagram of the corresponding relationship between the current and efficiency of sub-pixels of different colors;

[0024] Figure 3 It is a schematic diagram of the corresponding relationship between the voltage and efficiency of sub-pixels of different colors;

[0025] Figure 4 is a schematic structural diagram of a display substrate in one embodiment of the present disclosure;

[0026] Figure 5 is a schematic structural diagram of a photoresistor in one embodiment of the present disclosure;

[0027] Figure 6 It is another structural schematic diagram of a photoresistor in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0029] An embodiment of the present disclosure provides a display substrate.

[0030] In one embodiment, the display substrate includes a substrate 401 and a plurality of pixel units located on the substrate 401. Figure 1 As shown, each pixel unit includes a plurality of sub-pixels, wherein sub-pixels with different filling effects represent light-emitting units of sub-pixels of different colors.

[0031] The pixel unit includes a target pixel unit, the target pixel unit includes a target sub-pixel, the target sub-pixel includes a pixel driving circuit and a light-emitting unit, and the light-emitting unit can emit light under the drive of a control chip (IC) and the pixel driving circuit.

[0032] The target sub-pixel in the disclosed embodiment also includes a photoresistor 412, which is electrically connected to the pixel driving circuit of the target sub-pixel, and the resistance of the photoresistor 412 increases as the light intensity decreases. Since the luminous efficiency of sub-pixels of different colors at different brightnesses is different, the photoresistor 412 is set to provide different resistance values ​​under different brightness conditions, thereby achieving resistance adjustment, which helps to balance the luminous efficiency of sub-pixels of different colors at different brightnesses, thereby helping to improve the display effect.

[0033] In some embodiments, the light-emitting unit of the target sub-pixel includes a first electrode 409 , a second electrode 411 , and a light-emitting layer 410 located between the first electrode 409 and the second electrode 411 , and the material of the light-emitting layer 410 includes a phosphorescent light-emitting material.

[0034] It should be understood that the luminescent material system of the luminescent unit mainly includes two types: fluorescent luminescent materials and phosphorescent luminescent materials. Due to the different material systems, their electrical effects are somewhat different.

[0035] In the process of implementing the technical solution of the present application, relevant technicians have found that as the current and voltage increase, the efficiency of the light-emitting unit of the phosphorescent material gradually decreases, that is, when the voltage decreases, the efficiency of the light-emitting unit of the phosphorescent material will increase significantly, and this phenomenon is also called efficiency roll-off. As the current and voltage increase, the efficiency of the light-emitting unit of the fluorescent material does not decrease or increases to a certain extent. When the voltage decreases and the brightness decreases, the efficiency of the light-emitting unit of the fluorescent material does not change significantly.

[0036] Based on the above analysis, it can be seen that as the voltage and current change, the efficiency of the light-emitting units of different material systems changes inconsistently.

[0037] In the technical solution of this embodiment, the material of the light-emitting layer 410 of the target sub-pixel includes phosphorescent material. Thus, by setting a photoresistor 412, when the driving voltage and the operating current increase, the brightness of the light-emitting unit increases, while the resistance of the photoresistor 412 decreases. This is equivalent to increasing the actual voltage and the actual current to increase the light-emitting brightness and avoid the actual light-emitting brightness failing to reach the expected brightness due to reduced efficiency of the light-emitting unit.

[0038] When the driving voltage and the operating current are reduced, the brightness of the light-emitting unit is reduced and the resistance of the photoresistor 412 is increased, which is equivalent to further reducing the actual voltage and actual current of the light-emitting unit on the basis of the original driving voltage provided by the driving circuit, so as to balance the working effect of the light-emitting unit with other material systems.

[0039] In some of the embodiments, the resistance of the photoresistor 412 decreases as the light intensity increases. Thus, when the brightness of the target sub-pixel increases, the resistance of the photoresistor 412 of the target sub-pixel increases accordingly, thereby improving the actual voltage and actual current of the light-emitting unit to a certain extent, thereby balancing the working efficiency of each sub-pixel included in the target pixel unit, and helping to improve the display effect.

[0040] In some of the embodiments, the sub-pixels of the pixel unit include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the target sub-pixel includes at least one of a red sub-pixel and a green sub-pixel.

[0041] like Figure 2 and Figure 3 As shown, Figure 2 The relationship between the current (luminescence) and efficiency (efficiency) of different color sub-pixels, where the horizontal axis is the current percentage and the vertical axis is the efficiency. Figure 3 is the relationship between the voltage and efficiency of sub-pixels of different colors, wherein the unit of the abscissa is volt and the unit of the ordinate is percentage.

[0042] The light-emitting units of red and green sub-pixels usually use phosphorescent materials, while the light-emitting units of blue sub-pixels use fluorescent materials. Therefore, red and green sub-pixels may have roll-off phenomenon, and the roll-off phenomenon of red sub-pixels is more obvious. Figure 2 and Figure 3 It can be seen that at low grayscale, the efficiency of the red sub-pixel increases significantly when the brightness decreases, so as the voltage decreases, the proportion of red light in the brightness of white light will gradually increase, while the proportion of blue light will gradually decrease. In other words, the actual display effect will appear red at low grayscale and bluish at high grayscale.

[0043] In this embodiment, by using the red sub-pixel and the green sub-pixel as target sub-pixels and providing the photoresistor 412 , the roll-off phenomenon that may occur in the red sub-pixel and the green sub-pixel can be reduced, which helps to balance the display effect.

[0044] It should be understood that the efficiency of the device can be understood as the ratio of brightness to current, that is, efficiency = brightness / current. Further, current = voltage / resistance. Therefore, it can be roughly considered that efficiency = brightness*resistance / voltage, that is, brightness / voltage = efficiency / resistance.

[0045] If the brightness of sub-pixels of different colors needs to change consistently with the voltage, then the efficiency needs to change consistently with the resistance. Since the efficiency of red and green sub-pixels increases at low brightness, while the efficiency of blue sub-pixels decreases at low brightness, it is necessary to add a photoresistor 412 to at least the pixel driving circuit of the red sub-pixel and the pixel driving circuit of the green sub-pixel to make the red sub-pixel and the green sub-pixel consistent.

[0046] Furthermore, since the roll-off phenomenon of the red sub-pixel is more obvious than that of the green sub-pixel, in this embodiment, under the same light intensity, the resistance of the photoresistor 412 included in the red sub-pixel can be controlled to be greater than the photoresistor 412 corresponding to the green sub-pixel in the same target pixel unit.

[0047] In some of the embodiments, the target sub-pixel also includes a blue sub-pixel, wherein, under the same light intensity, the resistance of the photoresistor 412 included in the blue sub-pixel is smaller than the photoresistors 412 corresponding to the red sub-pixel and the green sub-pixel in the same target pixel unit.

[0048] In the technical solution of this embodiment, the blue sub-pixel is further used as the target sub-pixel. In this way, by setting photoresistors 412 with different resistance values ​​for sub-pixels of different colors for regulation, the color change consistency of sub-pixels of different colors can be improved, which helps to improve the display effect.

[0049] In some of the embodiments, the display substrate includes a display area and a non-display area, the display area has a power signal line, the power signal line extends along a first direction, the power signal line has an input end and an output end located in the non-display area, the target pixel unit includes a first target pixel unit and a second target pixel unit, and the distance between the first target pixel unit and the input end of the power signal line in the first direction is smaller than the distance between the second target pixel unit and the target edge of the display substrate.

[0050] The first target pixel unit includes a first target sub-pixel, and the second target pixel unit includes a second target sub-pixel. The luminous colors of the first target sub-pixel and the second target sub-pixel are the same. Under the same light intensity, the resistance value of the photoresistor 412 corresponding to the first target sub-pixel is greater than the resistance value of the photoresistor 412 corresponding to the second target sub-pixel.

[0051] In this embodiment, the display substrate includes a power signal line, and the above-mentioned first direction refers to the extension direction of the power signal line. For example, in a certain placement state of the display substrate, the power signal line extends along the horizontal direction of the display substrate, and the first direction refers to the horizontal direction at this time.

[0052] It should be understood that due to the resistance of structures such as the power signal line, when the driving voltage provided is constant, the actual operating voltages of pixel units at different positions are different, and as the distance from the input end of the power signal line increases, the difference between the actual operating voltage and the desired driving voltage becomes larger.

[0053] In this embodiment, when other conditions are the same, the resistance value of the photoresistor 412 corresponding to the target pixel unit with a larger distance from the target edge is smaller, thereby achieving compensation for the target pixel unit, which helps to improve the consistency of the display effect of the target pixel units at different positions.

[0054] In some of the embodiments, the display substrate includes a first display area and a second display area, the extension directions of the first display area and the second display area are the same as the extension direction of the target edge of the display substrate, the distance between the first display area and the input end of the power signal line along the first direction is smaller than the distance between the second display area and the target edge of the display substrate, the pixel units in the first display area are all first target pixel units, and the pixel units in the second display area are all second target pixel units.

[0055] In the present embodiment, the display substrate is divided into a plurality of display areas, wherein the target pixel unit in the first display area is a first target pixel unit, and the target pixel unit in the second display area is a second target pixel unit. In this way, the adverse effect of the resistance difference caused by the distance between different display areas and the target edge on the display effect can be reduced, which helps to reduce the possibility of color deviation under different display grayscales.

[0056] like Figure 4 As shown, in some embodiments, the display substrate includes a substrate 401, a driving circuit layer and a light-emitting unit located on the substrate 401. The driving circuit layer may include a buffer layer 402, an active layer 403, a gate insulating layer 404, a gate layer 405, a source-drain metal layer 407, a dielectric layer 406 and a planar layer 408, and the light-emitting unit includes a first electrode 409, a light-emitting layer 410 and a second electrode 411.

[0057] The first electrode 409 includes a first part 4091 connected to the pixel driving circuit and a second part 4092 connected to the light-emitting layer. The photoresistor 412 and the first electrode 409 are integrally arranged, and the orthographic projection of the photoresistor 412 on the substrate 401 is separated from the orthographic projection of the first part 4091 on the substrate 401, and the orthographic projection of the photoresistor 412 on the substrate 401 is separated from the orthographic projection of the second part 4092 on the substrate 401.

[0058] like Figure 5 and Figure 6As shown, the first electrode 409 is used as the anode of the light-emitting unit, and the second electrode 411 is used as the cathode of the light-emitting unit for exemplary description. Generally speaking, the cathode of the light-emitting unit is a common electrode, so in this embodiment, the photoresistor 412 is set to be connected to the anode of the target sub-pixel, so as to adjust the voltage and current of the light-emitting layer 410 of the target sub-pixel.

[0059] like Figure 5 and Figure 6 As shown, in some embodiments, the first electrode 409 further includes a third portion 4093 , which is located between the first portion 4091 and the second portion 4092 and is connected to both the first portion 4091 and the second portion 4092 .

[0060] like Figure 5 As shown, the third part 4093 includes a first sub-pattern 4121 and a second sub-pattern 4122 which are spaced apart. The first sub-pattern 4121 is connected to the first part 4091, and the second sub-pattern 4122 is connected to the second part 4092. The first sub-pattern 4121 and the second sub-pattern 4122 are both connected to the photosensitive layer 4123. The resistivity of the photosensitive material of the photosensitive layer 4123 increases with decreasing light intensity. The photosensitive layer 4123, the first sub-pattern 4121 and the second sub-pattern 4122 form a photoresistor 412.

[0061] In this embodiment, the photosensitive material of the photosensitive layer 4123 may include one or more of selenium, cadmium sulfide, cadmium selenide, cadmium telluride, gallium arsenide, silicon, germanium, and zinc sulfide, and is formed in a specific area by deposition or coating. The resistance of the formed photoresistor 412 can be set as needed. In this embodiment, it is set to 1KΩ~100KΩ, 10Lux, that is, when the brightness is 10 lux, the resistance of the photoresistor 412 is 1 kilo-ohm to 100 kilo-ohm.

[0062] like Figure 5 and Figure 6 As shown, in some embodiments, the first sub-graphic 4121 includes a plurality of first tooth structures, the second sub-graphic 4122 includes a plurality of second tooth structures, the first tooth structures and the second tooth structures are alternately arranged, the photosensitive layer 4123 is located on the side of the first electrode 409 away from the substrate 401, and the orthographic projection of the photosensitive layer 4123 on the substrate 401 overlaps with the orthographic projections of the first tooth structures and the second tooth structures on the substrate 401.

[0063] In this embodiment, the first tooth structure and the second tooth structure are staggered and covered by the photosensitive layer 4123. In this way, when the brightness changes, the material of the photosensitive layer 4123 changes, so that the resistance between the first tooth structure and the second tooth structure changes with the brightness. At the same time, since the distance between the staggered first tooth structure and the second tooth structure is small, it is possible to avoid excessive fluctuations in the resistance of the photoresistor 412, which may have an adverse effect on the display effect.

[0064] The size of the photoresistor 412 in this embodiment can be controlled by controlling the shape and size of the first tooth structure and the second tooth structure. It should be understood that when the pixel brightness is high, the resistance of the photoresistor 412 is very small, and when the brightness is low, the resistance of the photoresistor 412 is relatively large.

[0065] In this embodiment, the spacing between the first tooth-shaped structure and the second tooth-shaped structure can be controlled, and the spacing can be controlled to be 0.1-10 microns. Obviously, the larger the spacing is, the larger the resistance value of the photoresistor 412 is.

[0066] In this embodiment, the thickness and width of the photosensitive layer 4123 can also be controlled, wherein the thickness refers to the thickness in the direction perpendicular to the substrate 401, and the width refers to the distance in the direction from the first part 4091 to the second part 4092. In this embodiment, the thickness of the photosensitive layer 4123 is controlled at 1-1000 nanometers, and the width is controlled at 0.1-20 microns. The specific dimensions can be set as needed to achieve control of the resistance value of the photoresistor 412.

[0067] In some of the embodiments, the orthographic projection of the photosensitive layer 4123 on the substrate 401 is separated from the orthographic projection of the first sub-graphic 4121 excluding the first tooth-like structure on the substrate 401, and the orthographic projection of the photosensitive layer 4123 on the substrate 401 is separated from the orthographic projection of the second sub-graphic 4122 excluding the second tooth-like structure on the substrate 401.

[0068] Thus, in this embodiment, the first sub-pattern 4121 and the second sub-pattern 4122 can be electrically connected only through the photosensitive layer 4123 , which helps to improve the precision control of the size of the photoresistor 412 .

[0069] like Figure 6 As shown, in some embodiments, the first electrode 409 further includes a fourth portion 4094 , the fourth portion 4094 is connected to the first portion 4091 and the second portion 4092 , respectively, and the fourth portion 4094 is connected to the third portion 4093 in parallel.

[0070] like Figure 4As shown, in order to avoid too large a resistance variation range of the photoresistor 412, further, in one embodiment, the photoresistor 412 is only provided in a local area of ​​the first electrode 409, and the resistance variation of the local area is controlled to improve the regulation accuracy of the voltage and current.

[0071] In some of the embodiments, the display substrate further includes a pixel defining layer 413 and an opaque isolation structure, which is arranged on the same layer as the pixel defining layer 413 and is located on the side of the light-emitting layer 410 of the target sub-pixel away from the photoresistor 412 corresponding to the target sub-pixel.

[0072] The isolation structure in this embodiment is used to block the light emitted by other sub-pixels to improve the control accuracy of the voltage and current of the target sub-pixel. By setting the isolation structure, the photoresistor 412 is only exposed to the light-emitting unit of the target sub-pixel corresponding to the photoresistor 412. In this way, the resistance of the photoresistor 412 is mainly affected by the brightness of the light-emitting unit, which reduces the possible influence of the light emitted by other sub-pixels on the resistance of the photoresistor 412. During the working process, the feedback adjustment control of the photoresistor 412 can be realized according to the light brightness of the light-emitting unit, which is helpful for the control effect of the current and voltage of the target sub-pixel.

[0073] In some embodiments, along the direction from the first end to the second end, the length of the first portion 4091 is greater than the length of the third portion 4093. That is, the photoresistor 412 in this embodiment is closer to the light-emitting unit to improve the detection accuracy of the photoresistor 412 for brightness, thereby improving the accuracy of brightness adjustment control for the light-emitting unit.

[0074] In some of the embodiments, the light-emitting layer 410 of the target sub-pixel includes a first surface close to the substrate 401 and a second surface away from the substrate 401, and the orthographic projection of the first surface on the substrate 401 is located inside the orthographic projection of the second surface on the substrate 401. In other words, the area of ​​the orthographic projection of the second surface on the substrate 401 is larger than the area of ​​the orthographic projection of the first surface on the substrate 401, and the orthographic projection of the second surface on the substrate 401 covers the orthographic projection of the first surface on the substrate 401.

[0075] The orthographic projection of the second surface on substrate 401 overlaps with the orthographic projection of the photoresistor 412 corresponding to the target sub-pixel on substrate 401 , and the orthographic projection of the first surface on substrate 401 is separated from the orthographic projection of the photoresistor 412 corresponding to the target sub-pixel on substrate 401 .

[0076] In the present embodiment, it can be understood that the interface of the light-emitting layer 410 in the direction perpendicular to the substrate 401 is roughly an inverted trapezoid, and the length of the upper base of the trapezoid is greater than the length of the lower base. In this way, the first surface of the light-emitting layer 410 covers the photoresistor 412 to a certain extent, so that the photoresistor 412 can be more fully exposed to the light-emitting layer 410. When the light-emitting layer 410 emits light, the detection accuracy of the brightness of the light-emitting layer 410 can be improved.

[0077] An embodiment of the present disclosure further provides a display device, comprising the display substrate described in any one of the first aspects.

[0078] The display device of this embodiment includes all the technical solutions of the above-mentioned display substrate embodiment, and thus can at least achieve all the above-mentioned technical effects, which will not be described in detail here.

[0079] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A display substrate, comprising a substrate and a plurality of pixel units located on the substrate, each of the pixel units comprising a plurality of sub-pixels, the pixel units comprising a target pixel unit, the target pixel unit comprising a target sub-pixel, the target sub-pixel comprising a pixel driving circuit and a light-emitting unit capable of emitting light under the drive of the pixel driving circuit, the target sub-pixel further comprising a photoresistor, the photoresistor being electrically connected to the pixel driving circuit, and the resistance of the photoresistor increasing as the light intensity decreases; The light-emitting unit of the target sub-pixel includes a first electrode, a light-emitting layer, and a second electrode, the first electrode includes a first portion connected to the pixel driving circuit and a second portion connected to the light-emitting layer, the photoresistor and the first electrode are integrally arranged, and the orthographic projection of the photoresistor on the substrate is separated from the orthographic projection of the first portion on the substrate, and the orthographic projection of the photoresistor on the substrate is separated from the orthographic projection of the second portion on the substrate; The first electrode further includes a third portion, the third portion is located between the first portion and the second portion, and is connected to both the first portion and the second portion, the third portion includes a first sub-pattern and a second sub-pattern that are spaced apart, the first sub-pattern is connected to the first portion, the second sub-pattern is connected to the second portion, the first sub-pattern and the second sub-pattern are both connected to a photosensitive layer, the resistivity of the photosensitive material of the photosensitive layer increases with decreasing light intensity, and the photosensitive layer, the first sub-pattern and the second sub-pattern form the photoresistor; The first sub-graph includes a plurality of first tooth structures, the second sub-graph includes a plurality of second tooth structures, the first tooth structures and the second tooth structures are alternately arranged, the photosensitive layer is located on the side of the first electrode away from the substrate, and the orthographic projection of the photosensitive layer on the substrate overlaps with the orthographic projections of the first tooth structures and the second tooth structures on the substrate.

2. The display substrate according to claim 1, wherein: The resistance of the photoresistor decreases as the light intensity increases.

3. The display substrate according to claim 1, wherein: The light-emitting unit of the target sub-pixel includes a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode, and a material of the light-emitting layer includes a phosphorescent light-emitting material.

4. The display substrate according to claim 3, wherein: The sub-pixels of the pixel unit include a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the target sub-pixel includes at least one of a red sub-pixel and a green sub-pixel.

5. The display substrate according to claim 4, wherein: The target sub-pixel also includes a blue sub-pixel, wherein, under the same light intensity, the resistance value of the photoresistor included in the blue sub-pixel is smaller than the resistance value of the photoresistor corresponding to the red sub-pixel and the green sub-pixel in the same target pixel unit.

6. The display substrate according to claim 1, wherein: The display substrate comprises a display area and a non-display area, the display area has a power signal line, the power signal line extends along a first direction, the power signal line has an input end and an output end located in the non-display area, the target pixel unit comprises a first target pixel unit and a second target pixel unit, the distance between the first target pixel unit and the input end of the power signal line in the first direction is smaller than the distance between the second target pixel unit and the target edge of the display substrate; Among them, the first target pixel unit includes a first target sub-pixel, the second target pixel unit includes a second target sub-pixel, the first target sub-pixel and the second target sub-pixel have the same luminous color, and under the same light intensity, the resistance value of the photoresistor corresponding to the first target sub-pixel is greater than the resistance value of the photoresistor corresponding to the second target sub-pixel.

7. The display substrate according to claim 6, wherein: The display substrate includes a first display area and a second display area, the distance between the first display area and the input end of the power signal line along the first direction is smaller than the distance between the second display area and the target edge of the display substrate, the pixel units in the first display area are all the first target pixel units, and the pixel units in the second display area are all the second target pixel units.

8. The display substrate according to claim 1, wherein: The orthographic projection of the photosensitive layer on the substrate is separated from the orthographic projection of the first sub-pattern excluding the first tooth-like structure on the substrate, and the orthographic projection of the photosensitive layer on the substrate is separated from the orthographic projection of the second sub-pattern excluding the second tooth-like structure on the substrate.

9. The display substrate according to claim 1 or 8, wherein: The first electrode further includes a fourth portion, the fourth portion is connected to the first portion and the second portion respectively, and the fourth portion is connected to the third portion in parallel.

10. The display substrate according to claim 1, wherein: The display substrate also includes a pixel defining layer and an opaque isolation structure located on a side of the first electrode away from the substrate. The isolation structure is arranged in the same layer as the pixel defining layer and is located on a side of the light-emitting layer of the photoresistor corresponding to the target sub-pixel away from the target sub-pixel.

11. The display substrate according to claim 1, wherein: The light-emitting layer of the target sub-pixel comprises a first surface close to the substrate and a second surface far from the substrate, wherein the orthographic projection of the first surface on the substrate is located inside the orthographic projection of the second surface on the substrate; The orthographic projection of the second surface on the substrate overlaps with the orthographic projection of the photoresistor corresponding to the target sub-pixel on the substrate, and the orthographic projection of the first surface on the substrate is separated from the orthographic projection of the photoresistor corresponding to the target sub-pixel on the substrate. 12 . A display device comprising the display substrate according to claim 1 .

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