Display substrate and display device

Abstract

A display substrate and a display device. The display substrate comprises a base, a display structure layer disposed on the base, a color filter layer disposed on the side of the display structure layer distant from the base, and at least one light regulating portion. The display structure layer comprises a plurality of light-emitting elements, the color filter layer comprises a plurality of first filter units, a plurality of second filter units, and a plurality of third filter units of different colors, and the orthographic projection of the light-emitting elements on the base at least partially overlaps with the orthographic projection of the filter units on the base; the amount of light passing through the first filter units is greater than that passing through the second filter units and the third filter units. The light regulating portion is at least disposed on the side of the first filter units distant from the base, and is configured to reduce the transmittance of the light from the corresponding filter units, so that the light of different colors is more uniform.

Description

Display substrate and display device

[0001] This application claims priority to Chinese Patent Application No. 202510026938.9, filed on January 7, 2025, entitled “Display Substrate and Display Device”, the contents of which are to be understood as incorporated herein by reference. Technical Field

[0002] This article relates to, but is not limited to, display technology, and in particular to a display substrate and a display device. Background Technology

[0003] Organic light-emitting diodes (OLEDs) are active-matrix display devices with advantages such as self-illumination, wide viewing angle, high contrast, low power consumption, and extremely fast response speed. With the continuous development of display technology, display devices using OLEDs as light-emitting elements and controlled by thin-film transistors (TFTs) have become the mainstream products in the display field. Summary of the Invention

[0004] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0005] On one hand, this disclosure provides a display substrate, including: a substrate, a display structure layer disposed on the substrate, a color filter layer disposed on the side of the display structure layer away from the substrate, and at least one light adjustment unit; the display structure layer includes a plurality of light-emitting elements, the color filter layer includes a plurality of first filter units, a plurality of second filter units, and a plurality of third filter units of different colors, the orthographic projection of the light-emitting elements on the substrate and the orthographic projection of the filter units on the substrate at least partially overlap; more light passes through the first filter units than through the second filter units and the third filter units; the light adjustment unit is at least disposed on the side of the first filter unit away from the substrate, and is configured to reduce the transmittance of light from the corresponding filter unit so as to make the light of different colors more uniform.

[0006] In one exemplary embodiment, the light adjustment unit is configured to reduce the transmittance of light from the corresponding filter unit, including: the light adjustment unit absorbing light from the corresponding filter unit.

[0007] In one exemplary embodiment, the material of the light adjustment section includes a doped polymer material; or, the material of the light adjustment section includes a doped inorganic material.

[0008] In one exemplary embodiment, the cross-sectional shape of the light-adjusting portion in a plane perpendicular to the substrate is axially symmetrical along an axis of symmetry extending perpendicular to the substrate, and the thickness of the light-adjusting portion gradually increases in a direction away from the axis of symmetry; the thickness of the light-adjusting portion is the distance between the side surface of the light-adjusting portion near the substrate and the side surface away from the substrate in a direction perpendicular to the substrate.

[0009] In one exemplary embodiment, the thickness of the light adjustment portion varies in a stepped manner along a direction away from the axis of symmetry.

[0010] In one exemplary embodiment, the surface of the light adjustment unit away from the substrate includes at least two stepped surfaces, each of which is parallel to the substrate.

[0011] In one exemplary embodiment, the thickness of the light adjustment portion varies continuously in a direction away from the axis of symmetry.

[0012] In one exemplary embodiment, the center of the light adjustment portion is hollowed out in a direction perpendicular to the substrate.

[0013] In one exemplary embodiment, the light adjustment unit includes a bottom surface near the side of the substrate, and the angle between the line connecting the end of the bottom surface near the axis of symmetry and the center of the light-emitting element and the axis of symmetry is a first angle, which is greater than or equal to 18 degrees and less than or equal to 22 degrees.

[0014] In one exemplary embodiment, the angle between the line connecting the end of the bottom surface away from the axis of symmetry and the center of the light-emitting element and the axis of symmetry is a second angle, and the second angle is greater than or equal to 58 degrees.

[0015] In one exemplary embodiment, the light source further includes a plurality of lenses disposed on the side of the color filter layer away from the substrate, wherein light from the filter unit is deflected toward the center of the filter unit after passing through the lenses.

[0016] In one exemplary embodiment, the lens is located on the side of the light adjustment section away from the substrate; or, the lens is located on the side of the light adjustment section close to the substrate.

[0017] In one exemplary embodiment, the light adjustment unit and the corresponding filter unit are an integral structure.

[0018] In one exemplary embodiment, the plurality of light-emitting elements includes a plurality of first light-emitting elements, a plurality of second light-emitting elements, and a plurality of third light-emitting elements. The color of the light emitted by the first light-emitting elements is the same as the color of the first filter unit, the color of the light emitted by the second light-emitting elements is the same as the color of the second filter unit, and the color of the light emitted by the third light-emitting elements is the same as the color of the third filter unit. The orthographic projection of the light-emitting elements on the substrate at least partially overlaps with the orthographic projection of the filter unit on the substrate, including: the orthographic projection of the filter unit on the substrate at least partially overlaps with the orthographic projection of the light-emitting elements emitting the same color light on the substrate.

[0019] In one exemplary embodiment, the light emitted by the plurality of light-emitting elements is all white light.

[0020] On the other hand, embodiments of this disclosure provide a display device including a display substrate as described above.

[0021] The display substrate provided in this embodiment provides a light adjustment section at least on the side of the first filter unit away from the substrate. The light adjustment section reduces the transmittance of light from the first filter unit, making the light passing through the first filter unit, the second filter unit and the third filter unit more uniform. This improves the color consistency of the display substrate and the color performance at different viewing angles, and reduces color shift caused by viewing angle.

[0022] After reading and understanding the accompanying diagrams and detailed descriptions, the other aspects can be understood.

[0023] Overview of the attached figures

[0024] The accompanying drawings are used to provide an understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0025] Figure 1 is a schematic diagram of the structure of a display device;

[0026] Figure 2 is a schematic diagram of a planar structure of a display substrate;

[0027] Figure 3 is a schematic diagram of the equivalent circuit of a pixel driving circuit;

[0028] Figure 4 is a schematic cross-sectional view of a display substrate;

[0029] Figure 5 shows the brightness variation curves of different colors of light on the substrate in Figure 4 under the change of viewing angle in the horizontal direction.

[0030] Figure 6 shows the brightness variation curves of different colors of light on the substrate in Figure 4 under the vertical viewing angle variation.

[0031] Figure 7 shows the color shift curves of different colors of light on the substrate shown in Figure 4 under the change of viewing angle in the horizontal direction.

[0032] Figure 8 shows the color shift curves of different colors of light on the substrate shown in Figure 4 under the change of viewing angle in the vertical direction.

[0033] Figure 9 is a schematic cross-sectional view of the display substrate in an exemplary embodiment;

[0034] Figure 10 is an enlarged schematic diagram of the first light-emitting element, the first filter unit, and the light adjustment part in Figure 9 in an exemplary embodiment;

[0035] Figure 11 is a schematic diagram of the orthographic projection of the light adjustment unit and the first filter unit in Figure 9 onto the substrate in an exemplary embodiment;

[0036] Figure 12 is a schematic cross-sectional view of the display substrate in another exemplary embodiment;

[0037] Figure 13 is a schematic cross-sectional view of the display substrate in another exemplary embodiment;

[0038] Figure 14 is a schematic cross-sectional view of the display substrate in another exemplary embodiment.

[0039] Detailed Explanation

[0040] This disclosure describes several embodiments, but these descriptions are exemplary and not limiting, and it will be apparent to those skilled in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with, or may replace, any feature or element of any other embodiment.

[0041] This disclosure includes and contemplates combinations of features and elements known to those skilled in the art. The embodiments, features, and elements disclosed in this disclosure may also be combined with any conventional features or elements to form a unique inventive scheme as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive schemes to form another unique inventive scheme as defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in this disclosure may be implemented individually or in any suitable combination. Therefore, the embodiments are not limited except by the limitations imposed by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.

[0042] Furthermore, in describing representative embodiments, the specification may have presented methods and / or processes as a specific sequence of steps. However, the method or process should not be limited to the specific order of steps described herein, to the extent that the method or process does not depend on the specific order of steps described herein. As will be understood by those skilled in the art, other sequences of steps are also possible. Therefore, the specific order of steps set forth in the specification should not be construed as a limitation of the claims. Moreover, the claims relating to the method and / or process should not be limited to the steps performed in the order written, and those skilled in the art will readily understand that these orders can be varied and still remain within the spirit and scope of the embodiments disclosed herein.

[0043] In the accompanying drawings, the size of one or more constituent elements, the thickness of layers, or areas are sometimes exaggerated for clarity. Therefore, this disclosure is not necessarily limited to these dimensions, and the shape and size of one or more parts in the drawings do not reflect true proportions. Furthermore, the drawings schematically illustrate ideal examples, and this disclosure is not limited to the shapes or values ​​shown in the drawings.

[0044] The ordinal numbers such as "first," "second," and "third" used in this specification are used to avoid confusion among the constituent elements, not to limit the quantity. The term "multiple" in this disclosure refers to two or more quantities.

[0045] In this specification, for convenience, terms such as "middle," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate orientation or positional relationships in conjunction with the accompanying drawings. This is solely for the purpose of facilitating the description and simplification, and does not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this disclosure. The positional relationships of the constituent elements may be appropriately varied depending on the orientation of the constituent elements being described. Therefore, the use of terms not limited to those described in the specification may be appropriately replaced as needed.

[0046] In this specification, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate component, or a connection within two components. Those skilled in the art will understand the meaning of these terms in this disclosure as appropriate.

[0047] In this specification, "electrical connection" includes the situation where components are connected together by elements that have a certain electrical function. There are no particular limitations on what constitutes an "electrical function," as long as it allows for the transmission of electrical signals between the connected components. Examples of "electrical functions" include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, and other elements with various functions.

[0048] In this specification, "parallel" refers to the state where the angle formed by two straight lines is greater than or equal to -10° and less than 10°, and therefore also includes the state where the angle is greater than or equal to -5° and less than 5°. Similarly, "perpendicular" refers to the state where the angle formed by two straight lines is greater than or equal to 80° and less than 100°, and therefore also includes the state where the angle is greater than or equal to 85° and less than 95°.

[0049] In this specification, triangles, rectangles, trapezoids, pentagons, or hexagons are not strictly defined; they can be approximate triangles, rectangles, trapezoids, pentagons, or hexagons. Small deformations due to tolerances are possible, as are chamfers, curved edges, and other variations.

[0050] In this disclosure, “about” means a value that is not strictly limited and allows for process and measurement errors.

[0051] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0052] Figure 1 is a schematic diagram of a display device. As shown in Figure 1, the display device may include a timing controller, a data driver, a scan driver, a light-emitting driver, and a pixel array. The timing controller is connected to the data driver, the scan driver, and the light-emitting driver. The data driver is connected to multiple data signal lines (D1 to Dn), the scan driver is connected to multiple scan signal lines (S1 to Sm), and the light-emitting driver is connected to multiple light-emitting signal lines (E1 to Eo). The pixel array may include multiple sub-pixels Pxij, where i and j can be natural numbers. At least one sub-pixel Pxij may include a circuit unit and a light-emitting element connected to the circuit unit. The circuit unit may include at least a pixel driving circuit, which is connected to the scan signal lines, the data signal lines, and the light-emitting signal lines. In an exemplary embodiment, the timing controller can provide grayscale values ​​and control signals of specifications suitable for the data driver to the data driver, provide clock signals, scan start signals, etc. of specifications suitable for the scan driver to the scan driver, and provide clock signals, transmit stop signals, etc. of specifications suitable for the light-emitting driver to the light-emitting driver. The data driver can use grayscale values ​​and control signals received from the timing controller to generate data voltages to be provided to data signal lines D1, D2, D3, ..., Dn. For example, the data driver can sample grayscale values ​​using a clock signal and apply data voltages corresponding to the grayscale values ​​to data signal lines D1 to Dn in pixel rows, where n can be a natural number. The scan driver can generate scan signals to be provided to scan signal lines S1, S2, S3, ..., Sm by receiving clock signals, scan start signals, etc., from the timing controller. For example, the scan driver can sequentially provide scan signals with on-level pulses to scan signal lines S1 to Sm. For example, the scan driver can be configured as a shift register and can generate scan signals by sequentially transmitting scan start signals in the form of on-level pulses to the next stage circuit under the control of a clock signal, where m can be a natural number. The light-emitting driver can generate transmit signals to be provided to light-emitting signal lines E1, E2, E3, ..., Eo by receiving clock signals, transmit stop signals, etc., from the timing controller. For example, an LED driver can sequentially provide transmit signals with cutoff level pulses to LED signal lines E1 to Eo. For example, the LED driver can be configured as a shift register and can generate transmit signals by sequentially transmitting transmit stop signals in the form of cutoff level pulses to the next stage circuit under the control of a clock signal, where o can be a natural number.

[0053] Figure 2 is a schematic diagram of a planar structure of a display substrate. As shown in Figure 2, the display substrate may include multiple pixel units P arranged in a matrix. At least one pixel unit P may include a first sub-pixel P1 emitting a first color light, a second sub-pixel P2 emitting a second color light, and a third sub-pixel P3 emitting a third color light. Each sub-pixel may include a circuit unit and a light-emitting element. The circuit unit may include at least a pixel driving circuit. The pixel driving circuit is connected to a scan signal line, a data signal line, and a light-emitting signal line, respectively. The pixel driving circuit is configured to receive the data voltage transmitted by the data signal line and output a corresponding current to the light-emitting element under the control of the scan signal line and the light-emitting signal line. The light-emitting element in each sub-pixel is connected to the pixel driving circuit of its respective sub-pixel. The light-emitting element is configured to emit light of a corresponding brightness in response to the current output by the connected pixel driving circuit.

[0054] In an exemplary embodiment, the first sub-pixel P1 can be a red sub-pixel (R) that emits red light, the second sub-pixel P2 can be a blue sub-pixel (B) that emits blue light, and the third sub-pixel P3 can be a green sub-pixel (G) that emits green light. In an exemplary embodiment, the shape of the sub-pixels can be rectangular, rhomboid, pentagonal, or hexagonal, and the three sub-pixels can be arranged in a horizontal, vertical, or triangular manner, etc., which is not limited herein.

[0055] In an exemplary embodiment, a pixel unit may include four sub-pixels. For example, the four sub-pixels may include a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel that emits white (W) light. Alternatively, the four sub-pixels may include a red sub-pixel, a blue sub-pixel, and two green sub-pixels. In an exemplary embodiment, the four sub-pixels may be arranged in a horizontally parallel, vertically parallel, square, or diamond shape, etc., and this disclosure does not limit the arrangement.

[0056] Figure 3 is an equivalent circuit diagram of a pixel driving circuit. In an exemplary embodiment, the pixel driving circuit can be a 3T1C, 4T1C, 5T1C, 5T2C, 6T1C, 7T1C, or 8T1C structure. As shown in Figure 3, the pixel driving circuit may include seven transistors (first transistor T1 to seventh transistor T7) and one capacitor C. The pixel driving circuit is connected to six signal lines (data signal line D, first scan signal line S1, second scan signal line S2, light emission signal line E, initial signal line INIT, and first power supply line VDD).

[0057] In an exemplary embodiment, the pixel driving circuit may include a first node N1, a second node N2, and a third node N3. The first node N1 is connected to the first terminal of the third transistor T3, the second terminal of the fourth transistor T4, and the second terminal of the fifth transistor T5, respectively. The second node N2 is connected to the second terminal of the first transistor, the first terminal of the second transistor T2, the gate electrode of the third transistor T3, and the second terminal of the capacitor C, respectively. The third node N3 is connected to the second terminal of the second transistor T2, the second terminal of the third transistor T3, and the first terminal of the sixth transistor T6, respectively.

[0058] In an exemplary embodiment, the first end of capacitor C is connected to the first power line VDD, and the second end of capacitor C is connected to the second node N2, that is, the second end of capacitor C is connected to the gate electrode of the third transistor T3.

[0059] The gate electrode of the first transistor T1 is connected to the second scan signal line S2, the first terminal of the first transistor T1 is connected to the initial signal line INIT, and the second terminal of the first transistor is connected to the second node N2. When the on-level scan signal is applied to the second scan signal line S2, the first transistor T1 transmits the initial voltage to the gate electrode of the third transistor T3 to initialize the charge on the gate electrode of the third transistor T3.

[0060] The gate electrode of the second transistor T2 is connected to the first scan signal line S1, the first terminal of the second transistor T2 is connected to the second node N2, and the second terminal of the second transistor T2 is connected to the third node N3. When a conduction-level scan signal is applied to the first scan signal line S1, the second transistor T2 connects the gate electrode of the third transistor T3 to its second terminal.

[0061] The gate electrode of the third transistor T3 is connected to the second node N2, meaning the gate electrode of the third transistor T3 is connected to the second terminal of the capacitor C. The first terminal of the third transistor T3 is connected to the first node N1, and the second terminal of the third transistor T3 is connected to the third node N3. The third transistor T3 can be called the driving transistor. The amount of driving current flowing between the first power line VDD and the second power line VSS is determined by the potential difference between its gate electrode and its first terminal.

[0062] The gate electrode of the fourth transistor T4 is connected to the first scan signal line S1, the first electrode of the fourth transistor T4 is connected to the data signal line D, and the second electrode of the fourth transistor T4 is connected to the first node N1. The fourth transistor T4 can be called a switching transistor, scanning transistor, etc. When a conduction level scan signal is applied to the first scan signal line S1, the fourth transistor T4 causes the data voltage of the data signal line D to be input to the pixel driving circuit.

[0063] The gate electrode of the fifth transistor T5 is connected to the light-emitting signal line E, the first electrode of the fifth transistor T5 is connected to the first power supply line VDD, and the second electrode of the fifth transistor T5 is connected to the first node N1. The gate electrode of the sixth transistor T6 is connected to the light-emitting signal line E, the first electrode of the sixth transistor T6 is connected to the third node N3, and the second electrode of the sixth transistor T6 is connected to the first electrode of the light-emitting element EL. The fifth transistor T5 and the sixth transistor T6 can be referred to as light-emitting transistors. When a conduction-level light-emitting signal is applied to the light-emitting signal line E, the fifth transistor T5 and the sixth transistor T6 form a driving current path between the first power supply line VDD and the second power supply line VSS, causing the light-emitting element EL to emit light.

[0064] The gate electrode of the seventh transistor T7 is connected to the second scan signal line S2, the first electrode of the seventh transistor T7 is connected to the initial signal line INIT, and the second electrode of the seventh transistor T7 is connected to the first electrode of the light-emitting element EL. When the on-level scan signal is applied to the second scan signal line S2, the seventh transistor T7 transmits the initial voltage to the first electrode of the light-emitting element EL to initialize or release the accumulated charge in the first electrode of the light-emitting element EL.

[0065] In an exemplary embodiment, the light-emitting element EL can be an OLED, including a stacked first electrode, an organic light-emitting layer and a second electrode, or it can be a QLED, including a stacked first electrode, a quantum dot light-emitting layer and a second electrode. In this embodiment, the first electrode can be an anode and the second electrode can be a cathode. This disclosure does not limit this.

[0066] In an exemplary embodiment, the second electrode of the light-emitting element EL is connected to the second power line VSS, the signal of the second power line VSS is a continuously provided low-level signal, and the signal of the first power line VDD is a continuously provided high-level signal.

[0067] In an exemplary embodiment, the first transistor T1 to the seventh transistor T7 can be either P-type transistors or N-type transistors. Using the same type of transistor in the pixel driving circuit can simplify the process flow, reduce the processing difficulty of the display substrate, and improve the product yield. In some possible implementations, the first transistor T1 to the seventh transistor T7 may include both P-type and N-type transistors.

[0068] In an exemplary embodiment, the first transistor T1 to the seventh transistor T7 can be a low-temperature polycrystalline silicon (LTPS) thin-film transistor, or an oxide thin-film transistor, or a combination of both. The active layer of the LTPS is made of low-temperature polycrystalline silicon, while the active layer of the oxide thin-film transistor is made of oxide. LTPS transistors have advantages such as high mobility and fast charging, while oxide thin-film transistors have advantages such as low leakage current. Integrating LTPS and oxide thin-film transistors onto a single display substrate to form a low-temperature polycrystalline oxide (LTPO) display substrate leverages the advantages of both, enabling low-frequency driving, reducing power consumption, and improving display quality.

[0069] The following example illustrates the operation of a pixel driving circuit, where all seven transistors are P-type transistors:

[0070] In the first stage, A1, also known as the reset stage, the signal on the second scan signal line S2 is low, while the signals on the first scan signal line S1 and the light-emitting signal line E are high. The low signal on the second scan signal line S2 turns on the first transistor T1 and the seventh transistor T7. The turn on of the first transistor T1 provides the initial voltage of the initial signal line INIT to the second node N2, initializing capacitor C and clearing the existing data voltage within it. The turn on of the seventh transistor T7 provides the initial voltage of the initial signal line INIT to the first electrode of the OLED, initializing (resetting) the first electrode of the OLED, clearing its internal pre-stored voltage, and completing the initialization. The high signals on the first scan signal line S1 and the light-emitting signal line E turn off the second transistor T2, the fourth transistor T4, the fifth transistor T5, and the sixth transistor T6; during this stage, the OLED does not emit light.

[0071] The second stage, A2, is called the data writing stage or threshold compensation stage. During this stage, the signal on the first scan signal line S1 is low, while the signals on the second scan signal line S2 and the light emission signal line E are high. The data signal line D outputs a data voltage. Because the second terminal of capacitor C is low, the third transistor T3 is turned on. The low signal on the first scan signal line S1 turns on the second transistor T2 and the fourth transistor T4. The turn-on of transistors T2 and T4 allows the data voltage output from data signal line D to be supplied to the second node N2 via the first node N1, the turned-on third transistor T3, the third node N3, and the turned-on second transistor T2. The difference between the data voltage output from data signal line D and the threshold voltage of the third transistor T3 is charged into capacitor C. The voltage at the second terminal of capacitor C (second node N2) is Vd - |Vth|, where Vd is the data voltage output from data signal line D and Vth is the threshold voltage of the third transistor T3. The high signal on the second scan signal line S2 turns off the first transistor T1 and the seventh transistor T7. The signal on the light-emitting signal line E is a high-level signal, which disconnects the fifth transistor T5 and the sixth transistor T6.

[0072] The third stage, A3, is called the light-emitting stage. During this stage, the light-emitting signal line E is at a low level, while the first scan signal line S1 and the second scan signal line S2 are at a high level. The low level of the light-emitting signal line E turns on the fifth transistor T5 and the sixth transistor T6. Because a voltage Vd-|Vth| was written to the second terminal of capacitor C in the previous stage, the third transistor T3 remains on in this stage. The power supply voltage output from the first power line VDD provides a driving voltage to the first electrode of the OLED through the on-state fifth transistor T5, third transistor T3, and sixth transistor T6, driving the OLED to emit light.

[0073] During the pixel driving circuit operation, the driving current flowing through the third transistor T3 (driving transistor) is determined by the voltage difference between its gate electrode and its first electrode. Since the voltage of the second node N2 is Vdata - |Vth|, the driving current of the third transistor T3 is: I = K*(Vgs - Vth)2 = K*[(Vdd - Vd + |Vth|) - Vth]2 = K*(Vdd - Vd)2

[0074] Where I is the driving current flowing through the third transistor T3, which is the driving current driving the OLED, K is a constant, Vgs is the voltage difference between the gate electrode and the first electrode of the third transistor T3, Vth is the threshold voltage of the third transistor T3, Vd is the data voltage output by the data signal line D, and Vdd is the power supply voltage output by the first power supply line VDD.

[0075] Figure 4 is a schematic cross-sectional view of a display substrate. As shown in Figure 4, on a plane perpendicular to the display substrate, the display substrate may include a driving circuit layer 102 disposed on a substrate 101, a display structure layer 103 disposed on the side of the driving circuit layer 102 away from the substrate 101, and a color filter layer 105 disposed on the side of the display structure layer 103 away from the substrate 101. The driving circuit layer 102 of each sub-pixel may include a pixel driving circuit, and the display structure layer 103 may include multiple light-emitting elements. The multiple light-emitting elements can emit light under the drive of the corresponding pixel driving circuit. The light-emitting elements may be LED, OLED, QLED, etc., and are not limited here. The driving circuit layer 102 can be directly integrated on the substrate 101 to form a structure such as a silicon-based OLED display substrate. The display substrate may also include other film layers, such as a touch layer. The color filter layer 105 may include multiple filter units 52 of different colors and a black matrix 51 located between different filter units 52. The light emitted by the light-emitting elements is emitted after passing through the corresponding filter units 52 to form an image display. In an exemplary embodiment, the light-emitting element can emit light of different colors, and the filter unit 52 can be configured to correspond with the light-emitting element that emits light of the same color. Alternatively, the light-emitting element can emit white light, and the white light will present different colors of light after passing through the filter unit 52. This disclosure does not limit this.

[0076] Figure 5 shows the brightness variation curves of different colors of light on the display substrate in Figure 4 under different viewing angles in the horizontal direction, and compares them with the brightness variation of white light with viewing angle. As shown in Figure 5, the horizontal axis represents the viewing angle in degrees, and the vertical axis represents the percentage of brightness. The brightness at the center line of the display substrate screen is set to 100%. As the viewing angle increases in the left and right directions, the brightness of different colors of light gradually changes. In Figure 5, L1 represents red light, L2 represents green light, L3 represents blue light, and L4 represents white light. It can be seen from Figure 5 that as the viewing angle increases, the brightness of red, green, and white light all decreases, with green light decreasing faster than white light and red light decreasing slower. When the viewing angle is less than 45 degrees, the brightness change of blue light with increasing viewing angle is small, while when the viewing angle is greater than 45 degrees, the brightness of blue light gradually increases. Under viewing angles symmetrical to the left and right of the vertical axis, the brightness of the same color of light differs, and the degree of difference in brightness gradually increases with increasing viewing angle. This asymmetrical brightness variation is particularly evident in blue light.

[0077] Figure 6 shows the brightness variation curves of different colors of light on the display substrate in Figure 4 under vertical viewing angle changes, and compares them with the brightness variation of white light with viewing angle. As shown in Figure 6, the horizontal axis represents the viewing angle in degrees, and the vertical axis represents the percentage of brightness. With the screen brightness set to 100% when viewing the image from the front (i.e., the viewing angle between the user and the display substrate is 0 degrees), the brightness of different colors of light gradually changes as the viewing angle increases in the vertical direction. In Figure 5, L1 represents red light, L2 represents green light, L3 represents blue light, and L4 represents white light. Figure 5 shows that as the viewing angle increases, the brightness of red, green, and white light all decreases, with green light decreasing faster than white light, and red light decreasing slower than white light. When the viewing angle is less than 15 degrees, the change in blue light with increasing viewing angle is relatively small; when the viewing angle is greater than 15 degrees, the brightness of blue light increases significantly. When viewed symmetrically along the vertical axis, the brightness of light of the same color varies, and the degree of difference in brightness gradually increases with the increase of the viewing angle. This asymmetrical phenomenon of brightness change is particularly evident in blue light.

[0078] Figure 7 shows the color shift curves of different colors of light from the display substrate in Figure 4 under horizontal viewing angle changes, and Figure 8 shows the color shift curves of different colors of light from the display substrate in Figure 4 under vertical viewing angle changes, comparing them with the color shift of white light as a function of viewing angle. As shown in Figures 7 and 8, the horizontal axis represents the viewing angle in degrees, and the vertical axis represents the color deviation value (Duv), indicating the distance of the measured light source color point (u, v) from the Planck blackbody radiation curve. In Figures 7 and 8, L1 represents red light, L2 represents green light, L3 represents blue light, and L4 represents white light. From Figures 7 and 8, it can be observed that the color shift of red and green light is smaller as the viewing angle increases, while blue light shows a larger color shift at a viewing angle of approximately 20 degrees, and the degree of color shift of blue light gradually increases with increasing viewing angle. Under viewing angles symmetrical to the left and right of the vertical axis, the color deviation values ​​of the same color light differ, and the degree of difference in color deviation values ​​gradually increases with increasing viewing angle, with the asymmetry of blue light color shift being particularly pronounced.

[0079] Research has shown that light undergoes scattering and absorption during its passage through the filtering units, leading to a decrease in the brightness of the display substrate. Furthermore, the uneven variation in refraction, reflection, and filtering characteristics among different filtering units can cause color asymmetry in the display substrate at wide viewing angles. This not only affects the rate of brightness decay but also the display uniformity at different viewing angles. As shown in Figures 5 to 8, due to red light interference, the brightness curve of the blue light on the display substrate noticeably rises with increasing viewing angle, and the blue light color shift is also quite severe, resulting in a reddish tint to the display substrate at wide viewing angles. In other cases, an excessive amount of other colors of light may also cause the display substrate to exhibit other color shifts.

[0080] This disclosure provides a display substrate, including: a substrate, a display structure layer disposed on the substrate, a color filter layer disposed on the side of the display structure layer away from the substrate, and at least one light adjustment part;

[0081] The display structure layer includes multiple light-emitting elements, and the color filter layer includes multiple first filter units, multiple second filter units, and multiple third filter units of different colors. The orthographic projection of the light-emitting elements on the substrate and the orthographic projection of the filter units on the substrate at least partially overlap. More light passes through the first filter unit than light passes through the second filter unit and the third filter unit.

[0082] The light adjustment unit is at least disposed on the side of the first filter unit away from the substrate, and is configured to reduce the transmittance of light from the corresponding filter unit so as to make the light of different colors more uniform.

[0083] The display substrate provided in this embodiment provides a light adjustment section at least on the side of the first filter unit away from the substrate. The light adjustment section reduces the transmittance of light from the first filter unit, making the light passing through the first filter unit, the second filter unit and the third filter unit more uniform. This improves the color consistency of the display substrate and the color performance at different viewing angles, and reduces color shift caused by viewing angle.

[0084] In an exemplary embodiment, the light adjustment unit may have an absorption rate of 90% or greater than or equal to 90% for light from the corresponding filter unit, and this disclosure does not limit this.

[0085] Figure 9 is a cross-sectional view of a display substrate in an exemplary embodiment. The difference between Figure 9 and Figure 4 is that Figure 9 also includes an encapsulation layer 104, a first planarization layer 50, a light adjustment unit 106, a second planarization layer 107, a lens 108, a third planarization layer 109, and a cover plate 110, as well as three light-emitting elements illustrating the display structure layer 103. The remaining structure can be referred to the description of Figure 4 above, and will not be repeated here.

[0086] As shown in FIG9, the display structure layer 103 may include multiple light-emitting elements, which may include a first light-emitting element 311, a second light-emitting element 312, and a third light-emitting element 313. For example, the first light-emitting element 311 may be a red light-emitting element, the second light-emitting element 312 may be a green light-emitting element, and the third light-emitting element 313 may be a blue light-emitting element. This disclosure does not limit this. In other embodiments, the multiple light-emitting elements may also include a fourth light-emitting element (not shown in FIG9), which may be a white light-emitting element. Alternatively, all the multiple light-emitting elements of the display structure layer 103 may be white light-emitting elements. This disclosure does not limit this.

[0087] As shown in Figure 9, an encapsulation layer 104 can be disposed on the side of the display structure layer 103 away from the substrate 101 to prevent external moisture from entering the light-emitting element. In an exemplary embodiment, the encapsulation layer 104 may include a first encapsulation layer, a second encapsulation layer, and a third encapsulation layer stacked together. The first and third encapsulation layers may be made of inorganic materials, and the second encapsulation layer may be made of organic materials. The second encapsulation layer is disposed between the first and third encapsulation layers. This disclosure does not impose any limitations on this.

[0088] As shown in Figure 9, the color filter layer 105 may further include a first planarization layer 50, which is disposed on the side of the encapsulation layer 104 away from the substrate 101. The black matrix 51 and multiple filter units 52 may be disposed on the side of the first planarization layer 50 away from the substrate 101. The multiple filter units 52 may include a first filter unit 521, a second filter unit 522, and a third filter unit 523. The first filter unit 521 may be a red filter unit, the second filter unit 522 may be a green filter unit, and the third filter unit 523 may be a blue filter unit. The first filter unit 521 is disposed corresponding to the first light-emitting element 311, the second filter unit 522 is disposed corresponding to the second light-emitting element 312, and the third filter unit 523 is disposed corresponding to the third light-emitting element 313. When the light-emitting elements emit different colors of light, the orthographic projection of the filter unit on the substrate 101 at least partially overlaps with the orthographic projection of the light-emitting element emitting the same color of light on the substrate 101. When all light-emitting elements emit white light, the orthographic projection of the filter unit on the substrate 101 at least partially overlaps with the orthographic projection of the light-emitting element on the substrate 101, and one filter unit is provided corresponding to one light-emitting element.

[0089] In an exemplary embodiment, the orthographic projection of the filter unit on the substrate 101 may cover the orthographic projection of the light-emitting element on the substrate 101, or the orthographic projection of the filter unit on the substrate 101 may coincide with the orthographic projection of the light-emitting element on the substrate 101, so that the light emitted by the light-emitting element can completely pass through the corresponding filter unit. In other embodiments, the orthographic projection of the filter unit on the substrate 101 may be located within the range of the orthographic projection of the light-emitting element on the substrate 101, which allows for more accurate control of the light emission. The relationship between the orthographic projections of the filter unit and the corresponding light-emitting element on the substrate 101 can be set as needed, and this disclosure does not impose any limitations on this.

[0090] As shown in Figure 9, at least one light adjustment section 106 is provided on the side of the color filter layer 105 away from the substrate 101. The light adjustment section 106 is located on the side of the first filter unit 521 away from the substrate 101, and can reduce the transmittance of light from the first filter unit 521. In this embodiment, by providing the light adjustment section 106 on the side of the red filter unit away from the substrate 101, the transmittance of red light can be reduced, so that too much red light does not pass through, and crosstalk to other colors of light is not generated. This results in better color consistency of the display substrate, more accurate color performance of the display substrate at wide viewing angles, and reduced color shift caused by viewing angle. In other embodiments, a corresponding light adjustment unit 106 may be provided on the side of at least one of the green and blue filter units away from the substrate 101 as needed to reduce the transmittance of green and blue light, thereby making more precise adjustments to the display of the screen on the display substrate. The light adjustment unit 106 has different transmittance for different colors of light, so as to make targeted adjustments according to the situation of the display substrate. For example, the material of the light adjustment unit 106 provided corresponding to different color filter units may be different, and this disclosure does not limit this.

[0091] In an exemplary embodiment, light passing through the light filtering unit can be absorbed by the light adjustment unit 106, thereby reducing the transmittance of the corresponding color light. In an exemplary embodiment, the light adjustment unit 106 corresponding to the red light filtering unit can be made of a material with a high absorption rate for red light, such as an absorption rate of greater than or equal to 90% for red light with a wavelength range between 620 nm and 750 nm. In other embodiments, light passing through the light filtering unit can be reflected by the light adjustment unit 106, thereby blocking the passage of light. This disclosure does not limit the principle by which the light adjustment unit 106 reduces light transmittance.

[0092] In an exemplary embodiment, the material of the light-adjusting part 106 may include a doped polymer material. For example, absorption characteristics for a specific wavelength of light can be achieved by doping a suitable material into a polymer material such as polycarbonate (PC) or polyimide (PI), and this disclosure does not limit this. During preparation, a solution of the doped polymer material can be directly coated onto the surface of the color filter layer 105, and then cured by baking or heat treatment to form the light-adjusting part 106, and this disclosure does not limit this.

[0093] In an exemplary embodiment, the material of the light adjustment section 106 may include a doped inorganic material. For example, doping can be performed on inorganic materials such as titanium dioxide (TiO2) and indium tin oxide (ITO) to control the reflection and absorption characteristics of the doped material for specific light. This disclosure does not limit this. During fabrication, the doped inorganic material can be deposited onto the surface of the color filter layer 105 using chemical vapor deposition (CVD) to form an initial material layer. Then, the initial material layer is used to form the light adjustment section 106 through a photolithography process. For example, a mask with different transmittance in different areas can be designed. A layer of photoresist is first spin-coated onto the initial material layer. The photoresist is then exposed and developed using such a mask to form a stepped pattern on the photoresist. Subsequently, the pattern of the photoresist is transferred to the initial material layer through an etching process to form the light adjustment section 106 with a stepped structure. This disclosure does not limit this.

[0094] In an exemplary embodiment, the light-adjusting section 106 may include multiple layers of high-reflectivity and low-reflectivity materials alternately arranged along a direction away from the substrate 101 to form a distributed Bragg reflection (DBR) structure, in order to obtain suitable optical properties. This disclosure does not limit this. The type or amount of doped material at different locations of the light-adjusting section 106 can be controlled during the formation process to form different transmittances at different locations of the light-adjusting section 106. The distribution of the doped material and the thickness of the light-adjusting section 106 at different locations can be combined to more precisely control the transmittance of the light-adjusting section 106 at different locations. This disclosure does not limit this.

[0095] In an exemplary embodiment, the cross-sectional shape of the light adjustment section 106 in a plane perpendicular to the substrate 101 is axially symmetrical along an axis of symmetry extending in a direction perpendicular to the substrate 101. Furthermore, the thickness of the light adjustment section 106 gradually increases in a direction away from the axis of symmetry. The thickness of the light adjustment section 106 is the distance between the surfaces of the light adjustment section 106 approaching and moving away from the substrate 101 in a direction perpendicular to the substrate 101. By setting the light adjustment section 106 to be axially symmetrical along an axis of symmetry perpendicular to the substrate 101, and by gradually increasing its thickness from the center to the edge, the light absorption of the light adjustment section 106 gradually increases in the direction from the center to the edge, while the light transmittance gradually decreases. When the viewing angle changes significantly, this not only allows for better adjustment of the symmetry of brightness attenuation, ensuring the brightness uniformity of the display substrate under various viewing angles and improving the visual experience, but also makes the color shift more uniform under different viewing angles, reducing color deviation caused by viewing angle changes, making color performance more stable and realistic, and improving the overall display effect of the display substrate. The thickness of the light adjustment part 106 at different positions can be designed according to needs, taking into account the characteristics of the light transmittance or reflectance of the light adjustment part 106, and this disclosure does not limit this.

[0096] In an exemplary embodiment, the thickness of the light adjustment section 106 varies in a stepped manner along the direction away from the axis of symmetry, which can make the light irradiated on the same step surface have the same transmittance, and the light irradiated on different step surfaces have different transmittances, making the adjustment of transmittance more flexible. Furthermore, the same step surface can be set as a plane, inclined surface, or curved surface, etc., so as to adjust the light transmittance more precisely.

[0097] In an exemplary embodiment, the thickness of the light adjustment section 106 varies continuously in the direction away from the axis of symmetry. The surface of the light adjustment section 106 away from the substrate 101 can be set into a shape such as a slope or a curved surface, which can make the change in light transmittance more uniform.

[0098] Figure 10 is an enlarged schematic diagram of the first light-emitting element, the first filter unit, and the light adjustment unit in Figure 9 in an exemplary embodiment, omitting the remaining structure of the display substrate. Referring to Figures 9 and 10, the center line O passes through the center of the light-emitting element in a direction perpendicular to the display substrate. The center of the light-emitting element can be its geometric center, and the center line O can be the axis of symmetry of the light adjustment unit 106, or the axis of symmetry between the light adjustment unit 106 and the corresponding first filter unit 521. The first ray L1 incident from the first light-emitting element 311 onto the light adjustment unit 106 has a first angle α1 with the center line O. The first angle α1 can be greater than or equal to 18 degrees and less than or equal to 22 degrees; for example, the first angle α1 can be approximately 20 degrees. The second ray L2 incident from the first light-emitting element 311 onto the light adjustment unit 106 has a second angle α2 with the center line O. The second angle α2 can be greater than or equal to 58 degrees; for example, the second angle α2 can be approximately 60 degrees. In the direction perpendicular to the base 101, the middle part of the light adjustment part 106 can be a hollow structure. For example, the shape of the light adjustment part 106 can be ring-shaped. The surface of the light adjustment part 106 near the base 101 can be called the bottom surface. The first light L1 can illuminate the bottom surface of the light adjustment part 106 near the center line O, and the second light L2 can illuminate the bottom surface of the light adjustment part 106 away from the center line O. Because the center of the light adjustment section 106 has a hollow structure, the portion of the light emitted by the light-emitting element whose angle with the center line O is less than the first angle a1 will not illuminate the light adjustment section 106, but will be emitted directly, allowing the light to have normal color performance at small viewing angles (0 degrees to 20 degrees). The portion of the light emitted by the light-emitting element whose angle with the center line O is greater than or equal to the first angle a1 and less than or equal to the second angle a2 will be adjusted by the light adjustment section 106. As can be seen from Figures 5 to 8, the attenuation and color shift of the light at small viewing angles are very small, and this portion of the light does not need to be adjusted, which helps to ensure the brightness performance of the display substrate. The aforementioned first angle a1 is approximately 20 degrees and the second angle a2 is approximately 60 degrees, which can be applied to micro-display substrates of silicon-based OLEDs. In other display substrates, the range of the first angle a1 and the second angle a2 can be set as needed, and this disclosure does not impose any limitations on this.

[0099] In an exemplary embodiment, as shown in FIG10, the light adjustment unit 106 may be axially symmetrical about the axis of symmetry O. The light adjustment unit 106 may have multiple stepped surfaces in the direction away from the axis of symmetry O. For example, in the direction away from the axis of symmetry O, the light adjustment unit 106 may sequentially include a first stepped surface, a second stepped surface, and a third stepped surface. The length of the first stepped surface in the direction away from the axis of symmetry O is a first length S1, the length of the second stepped surface in the direction away from the axis of symmetry O is a second length S2, and the length of the third stepped surface in the direction away from the axis of symmetry O is a third length S3. The first length S1 may be greater than or equal to the third length S3, and the third length S3 may be greater than or equal to the second length S2. The height of the light adjustment unit 106 at the first stepped surface is a first height H1, the height of the light adjustment unit 106 at the second stepped surface is a second height H2, and the height of the light adjustment unit 106 at the third stepped surface is a third height H3. The first height H1 is less than the second height H2, and the second height H2 is less than the third height H3. The number of stepped surfaces included in the light adjustment unit 106 and the length of each stepped surface can be set as needed to more accurately adjust the light at different angles. This disclosure does not limit this.

[0100] Figure 11 is a schematic diagram of the orthographic projection of the light adjustment unit and the first filter unit in Figure 9 onto the substrate in an exemplary embodiment. As shown in Figure 11, the edge of the orthographic projection of the light adjustment unit 106 onto the substrate 101 can coincide with the edge of the orthographic projection of the first filter unit 521 onto the substrate 101. The middle part of the light adjustment unit 106 has a hollow structure in the direction perpendicular to the substrate 101, so that light with an angle smaller than the first angle α1 can be directly emitted from the first filter unit 521. The hollow position and hollow size of the light adjustment unit 106, as well as the orthographic projection relationship between the light adjustment unit 106 and the first filter unit 521 onto the substrate 101, can be set as needed, and this disclosure does not limit this.

[0101] Referring again to Figure 9, a second planarization layer 107 can be disposed on the side of the light adjustment section 106 away from the substrate 101. Multiple lenses 108 can be disposed on the side of the second planarization layer 107 away from the substrate 101. The lenses 108 are correspondingly disposed with the filter units and are configured to converge light. Light from the filter units is deflected towards the center of the filter unit after passing through the lenses 108. The center of the filter unit can be its geometric center, thereby improving the light extraction efficiency of the display substrate and enhancing the display effect. The lenses 108 can be axially symmetrical along the axis of symmetry O. Figure 9 illustrates an example where the cross-section of the lens 108 in the plane perpendicular to the substrate 101 is arc-shaped. In other embodiments, the cross-section of the lens 108 in the plane perpendicular to the substrate 101 can be other shapes, such as trapezoids, inverted trapezoids, and polygons, etc. This disclosure does not limit this.

[0102] In an exemplary embodiment, the orthographic projection of lens 108 onto substrate 101 may cover the orthographic projection of the corresponding filter unit onto substrate 101, or the orthographic projection of lens 108 onto substrate 101 may coincide with the orthographic projection of the corresponding filter unit onto substrate 101, so that light rays from the direction of the filter unit can pass through lens 108, thereby improving light extraction efficiency. In other embodiments, the orthographic projection of lens 108 onto substrate 101 may be located within the range of the orthographic projection of the corresponding filter unit onto substrate 101, and this disclosure does not impose any limitations on this.

[0103] In an exemplary embodiment, a third planarization layer 109 may be provided on the side of the lens 108 away from the substrate 101, and a cover plate 110 may be provided on the side of the third planarization layer 109 away from the substrate 101. The material of the third planarization layer 109 may be adhesive to facilitate fixing the cover plate 110.

[0104] Figure 12 is a cross-sectional view of the display substrate in another exemplary embodiment. The difference between Figure 12 and Figure 9 is that the lens 108 is located on the side of the light adjustment section 106 near the substrate 101. The rest of the structure can be referred to the description of Figure 9 above, and will not be repeated here.

[0105] In an exemplary embodiment, as shown in FIG12, a third planarization layer 109 may be provided on the side of the lens 108 away from the substrate 101, a light adjustment part 106 may be provided on the side of the third planarization layer 109 away from the substrate 101, and a second planarization layer 107 may be provided on the side of the light adjustment part 106 away from the substrate 101. The material of the second planarization layer 107 may be adhesive to facilitate fixing the cover plate 110.

[0106] In the display substrate shown in Figure 12, light is first focused by lens 108 and then the transmittance is adjusted by light adjustment unit 106. This allows for effective control of the spectral characteristics of the transmitted light when the light is more focused. The light adjustment unit 106 has higher efficiency in adjusting the light transmittance, resulting in better brightness uniformity of the display substrate. It also reduces brightness unevenness caused by color shift at large viewing angles, improves the color shift symmetry of the display substrate, and prevents color distortion at large viewing angles, resulting in better color consistency at different angles.

[0107] Figure 13 is a cross-sectional view of the display substrate in another exemplary embodiment. The difference between Figure 13 and Figure 9 is that the shape of the light adjustment unit 106 is different. The rest of the structure can be referred to the description of Figure 9 above, and will not be repeated here.

[0108] As shown in Figure 13, in a plane perpendicular to the display substrate, the cross-sectional shape of the light adjustment part 106 is axially symmetrical along the center line O, and the thickness of the light adjustment part 106 gradually increases in the direction away from the center line O. The surface of the light adjustment part 106 away from the substrate 101 is curved, and the light transmittance changes more uniformly.

[0109] Figure 14 is a cross-sectional view of the display substrate in another exemplary embodiment. The difference between Figure 14 and Figure 9 is that the light adjustment unit 106 and the first filter unit 521 are an integral structure. The remaining structure can be referred to the description of Figure 9 above, and will not be repeated here.

[0110] As shown in Figure 14, by setting the light adjustment unit 106 and the first filter unit 521 as an integrated structure, the light can achieve transmittance adjustment and color conversion after passing through the first filter unit 521, without the need to set up an additional light adjustment unit 106, which helps to simplify the preparation steps.

[0111] In an exemplary embodiment, as shown in FIG14, in a plane perpendicular to the display substrate, the cross-sectional shape of the first filter unit 521 is axially symmetrical along the center line O, and the thickness of the first filter unit 521 gradually increases in the direction away from the center line O. The surface of the first filter unit 521 on the side away from the substrate 101 can be curved or stepped, etc. The light emitted by the light-emitting element includes a first portion of light with an angle less than the first angle a1 with respect to the center line O, and a second portion of light with an angle greater than or equal to the first angle a1 and less than or equal to the second angle a2 with respect to the center line O. The thickness of the first filter unit 521 in the region corresponding to the first portion of light can be less than the thickness of the first filter unit 521 in the region corresponding to the second portion of light. When the light emitted by the light-emitting element is white light, the thickness of the first filter unit 521 in any region is not zero, so as to change the color of the light. When the color of the light emitted by the first filter unit 521 is the same as that of the light-emitting element, the first filter unit 521 may have a hollow structure. The transmittance of the first filter unit 521 to light can be adjusted by controlling the thickness of the first filter unit 521 in different regions. This disclosure does not limit this.

[0112] In the exemplary embodiments, the structures in Figures 9 to 14 can be arbitrarily combined with each other, and this disclosure does not impose any limitations on this. The above embodiments are all described using the example of an excessive amount of red light from the display substrate and a reddish tint to the display substrate color. If there is an excessive amount of other colors of light from the display substrate, a light adjustment unit can be provided in other locations as needed, and this disclosure does not impose any limitations on this.

[0113] The display substrate provided in this disclosure improves the color shift phenomenon at large viewing angles by precisely controlling the transmittance of different colors of light. It allows for targeted design for different types of display substrates, optimizing the consistency of color shift and brightness attenuation of different colors of light, thereby enhancing the display effect and improving the user's viewing experience. Furthermore, it requires minimal modification to existing manufacturing processes, making it suitable for widespread application.

[0114] This disclosure also provides a display device, including the display substrate described in any of the above embodiments. The display device can be any product or component with display function, such as a silicon-based OLED display, OLED display, QLED display, LED display, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, etc., and this disclosure is not limited thereto.

[0115] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A display substrate, comprising: A substrate, a display structure layer disposed on the substrate, a color filter layer disposed on the side of the display structure layer away from the substrate, and at least one light adjustment unit; The display structure layer includes multiple light-emitting elements, and the color filter layer includes multiple first filter units, multiple second filter units, and multiple third filter units of different colors. The orthographic projection of the light-emitting elements on the substrate and the orthographic projection of the filter units on the substrate at least partially overlap. More light passes through the first filter unit than through the second and third filter units; The light adjustment unit is at least disposed on the side of the first filter unit away from the substrate, and is configured to reduce the transmittance of light from the corresponding filter unit so as to make the light of different colors more uniform.

2. The display substrate according to claim 1, wherein, The light adjustment unit is configured to reduce the transmittance of light from the corresponding filter unit, including: The light adjustment unit absorbs light from the corresponding filter unit.

3. The display substrate according to claim 2, wherein, The material of the light-adjusting part includes a doped polymer material; or, the material of the light-adjusting part includes a doped inorganic material.

4. The display substrate according to claim 2, wherein, The cross-sectional shape of the light-adjusting part in a plane perpendicular to the substrate is axially symmetrical along an axis of symmetry extending perpendicular to the substrate, and the thickness of the light-adjusting part gradually increases in a direction away from the axis of symmetry; the thickness of the light-adjusting part is the distance between the side surface of the light-adjusting part near the substrate and the side surface away from the substrate in a direction perpendicular to the substrate.

5. The display substrate according to claim 4, wherein, The thickness of the light-adjusting section varies in a stepped manner along a direction away from the axis of symmetry.

6. The display substrate according to claim 5, wherein, The light-adjusting part has at least two stepped surfaces on the side away from the substrate, each of which is parallel to the substrate.

7. The display substrate according to claim 4, wherein, The thickness of the light adjustment section varies continuously in a direction away from the axis of symmetry.

8. The display substrate according to claim 4, wherein, The center of the light adjustment section is hollowed out in a direction perpendicular to the base.

9. The display substrate according to claim 8, wherein, The light adjustment unit includes a bottom surface near the base. The angle between the line connecting the end of the bottom surface near the axis of symmetry and the center of the light-emitting element and the axis of symmetry is a first angle. The first angle is greater than or equal to 18 degrees and less than or equal to 22 degrees.

10. The display substrate according to claim 9, wherein, The angle between the line connecting the end of the bottom surface away from the axis of symmetry and the center of the light-emitting element and the axis of symmetry is the second angle, and the second angle is greater than or equal to 58 degrees.

11. The display substrate according to claim 4, further comprising a plurality of lenses disposed on the side of the color filter layer away from the substrate, wherein light from the filter unit is deflected toward the center of the filter unit after passing through the lenses.

12. The display substrate according to claim 11, wherein, The lens is located on the side of the light adjustment section away from the substrate; or, the lens is located on the side of the light adjustment section closer to the substrate.

13. The display substrate according to claim 1, wherein, The light adjustment unit and the corresponding filter unit are an integral structure.

14. The display substrate according to any one of claims 1-13, wherein, The plurality of light-emitting elements includes a plurality of first light-emitting elements, a plurality of second light-emitting elements, and a plurality of third light-emitting elements. The color of the light emitted by the first light-emitting elements is the same as the color of the first filter unit, the color of the light emitted by the second light-emitting elements is the same as the color of the second filter unit, and the color of the light emitted by the third light-emitting elements is the same as the color of the third filter unit. The orthographic projection of the light-emitting element on the substrate at least partially overlaps with the orthographic projection of the filter unit on the substrate, including: The orthographic projection of the filter unit on the substrate at least partially overlaps with the orthographic projection of the light-emitting element emitting the same color light on the substrate.

15. The display substrate according to claim 1, wherein, The light emitted by all of the aforementioned light-emitting elements is white light.

16. A display device comprising a display substrate as claimed in any one of claims 1-15.

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