Display panel and display device

Abstract

The invention discloses a display panel and a display device, the display panel comprises a substrate, a pixel driving layer, a light emitting unit layer, a light adjusting layer and a packaging layer, and the pixel driving layer is arranged on the substrate; the light-emitting unit layer is arranged on the pixel driving layer; the light adjusting layer is arranged on the light emitting unit layer; the packaging layer is arranged on the light adjusting layer; wherein the light adjusting layer adjusts the transmittance of the light adjusting layer according to the brightness of the light emitting unit layer; when the brightness of the light-emitting unit layer is lower than the preset brightness, the light transmittance of the light adjusting layer is increased. According to the display panel, the light adjusting layer is arranged to balance uneven light emitting brightness of the light emitting unit caused by manufacturing procedures and water and oxygen invasion, and the display effect of the display panel is improved.

Description

Technical Field

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

[0002] With the continuous development of OLED (Organic Light-Emitting Diode) display technology, OLED is increasingly used in displays such as smartphones, tablets, computers, and televisions. OLED displays have the advantages of being thin and light, high contrast, fast response, wide viewing angle, high brightness, and full color. However, the cathode in the OLED display panel is an active metal, which is very sensitive to water vapor and oxygen in the air. It is very easy to react with water vapor and oxygen that penetrate from the outside, affecting the injection of charges; in addition, the water vapor and oxygen that penetrate will also chemically react with the organic light-emitting materials in the light-emitting layer, damaging the organic light-emitting materials, greatly reducing the luminous efficiency of the organic light-emitting materials, causing the performance of the OLED display panel to decline and the life to be shortened. Therefore, the OLED display panel has very high requirements for packaging.

[0003] However, in addition to the degradation of the light-emitting unit performance caused by the lax packaging mentioned above, the OLED process factors may also cause different light-emitting units to have different performances, resulting in uneven brightness under the same driving voltage. Summary of the invention

[0004] The purpose of the present application is to provide a display panel and a display device, which balance the uneven brightness of the light-emitting unit due to the process and water and oxygen intrusion by setting a light adjustment layer, thereby improving the display effect of the display panel.

[0005] The present application discloses a display panel, which includes a base substrate, a pixel driving layer, a light emitting unit layer, a light adjustment layer and an encapsulation layer, wherein the pixel driving layer is arranged on the base substrate; the light emitting unit layer is arranged on the pixel driving layer; the light adjustment layer is arranged on the light emitting unit layer; the encapsulation layer is arranged on the light adjustment layer; wherein the light adjustment layer adjusts the transmittance of the light adjustment layer according to the brightness of the light emitting unit layer; when the brightness of the light emitting unit layer is lower than a preset brightness, the light transmittance of the light adjustment layer increases.

[0006] Optionally, when the light-emitting unit layer emits light normally, the light adjustment layer is in a first state, and the light transmittance of the light adjustment layer is a fixed value between 5% and 90%; when the brightness of the light-emitting unit layer when emitting light normally is lower than a preset brightness, the transmittance of the light adjustment layer increases.

[0007] Optionally, the display panel includes an opening area and a non-opening area, the display panel also includes a pixel definition layer, the light-emitting unit layer is provided with a plurality of light-emitting units, two adjacent light-emitting units are separated by the pixel definition layer, the pixel definition layer is arranged in the non-opening area, and the light-emitting unit is arranged in the opening area; the light adjustment layer includes a sealing layer and a plurality of light adjustment parts, a plurality of sealed cavities are arranged in the sealing layer, a light adjustment part is arranged in each of the sealed cavities, and they are respectively arranged in the plurality of opening areas; wherein the light transmittance of the light adjustment part is adjustable from 0% to 90%.

[0008] Optionally, the light adjustment part includes a thermal expansion temperature-sensitive hydrogel layer, and the light adjustment layer also includes a plurality of temperature rising parts, and the plurality of temperature rising parts are respectively arranged in the plurality of opening areas, and the temperature rising part is used to provide heat for the thermal expansion temperature-sensitive hydrogel layer, and the thermal expansion temperature-sensitive hydrogel layer is used to absorb different heat to produce different transmittances; the display panel also includes a control unit, and the control unit is used to control the temperature rising part to rise or fall; when the light-emitting unit layer emits light normally, the control unit controls the temperature rising part to rise to an initial preset temperature, the thermal expansion temperature-sensitive hydrogel layer is in a first state, and the light transmittance of the light adjustment layer is a fixed value of 5% to 90%; when the brightness of the normal light emission of the light-emitting unit is lower than the preset brightness, the control unit controls the temperature rising part in the opening area where the light-emitting unit is located to rise to a target temperature, the light transmittance of the thermal expansion temperature-sensitive hydrogel layer increases, and the target temperature is greater than the initial preset temperature.

[0009] Optionally, the light adjustment layer further includes a heat insulation layer, the heat insulation layer wraps the temperature rising part and the sealing layer, and the heat insulation layer is used for heat insulation and heat preservation.

[0010] Optionally, the temperature rising part is formed of a wave-absorbing temperature rising material, which is used to convert the absorbed ultrasonic waves into a temperature rise.

[0011] Optionally, the thickness of the thermal expansion temperature-sensitive hydrogel layer is between 1 um and 5 um; under the orthographic projection of the base substrate, the projection width of the thermal expansion temperature-sensitive hydrogel layer is greater than or equal to the width of the opening area.

[0012] Optionally, when the light-emitting unit does not emit light and the control unit controls the temperature-raising unit not to work, the thermal expansion temperature-sensitive hydrogel layer is in a second state, and the light transmittance of the thermal expansion temperature-sensitive hydrogel layer is between 0% and 5%.

[0013] Optionally, the light-emitting unit layer includes a plurality of red light-emitting units, a plurality of green light-emitting units and a plurality of blue light-emitting units, the red light-emitting units, the green light-emitting units and the blue light-emitting units are respectively located in the opening areas, and on the orthographic projection of the base substrate, there is at least one opening area within the projection range of the sealed cavity; the display panel also includes a color filter layer, the color filter layer includes a black matrix and a plurality of color filter parts, the black matrix is ​​arranged in the non-opening area, and the plurality of color filter parts are respectively arranged in the plurality of opening areas.

[0014] The present application also discloses a display device, comprising a driving circuit and the above-mentioned display panel, wherein the driving circuit is used to drive the display panel to display.

[0015] The present application sets a light adjustment layer and utilizes the ability of the light adjustment layer to adjust the light transmittance. When the light transmittance of the light adjustment layer increases, the corresponding light has a stronger ability to pass through the light adjustment layer, and the corresponding brightness is brighter. When the multiple light-emitting units in the display panel have different luminous brightness under the same driving voltage due to water and oxygen invasion caused by process reasons or package rupture, the light transmittance of the light adjustment layer on the light-emitting unit is adjusted to balance the different brightness of the light-emitting unit. When the light-emitting unit emits light, the transmittance of the light adjustment layer is normally adjusted to a fixed value. When it is detected that the brightness of the light emitted by the light-emitting unit is low or lower than the preset brightness, the brightness of the light-emitting unit is increased by increasing the light transmittance of the light adjustment layer at this position. The uneven luminous brightness of the light-emitting unit due to the process and water and oxygen invasion is balanced to improve the display effect of the display panel. Moreover, the light adjustment layer in this embodiment is arranged between the encapsulation layer and the light-emitting unit layer, which can buffer the small protruding particles generated by the light-emitting unit layer in the process to generate pinholes or cracks in the inorganic layer in the encapsulation layer, thereby improving the encapsulation capacity of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0017] Figure 1 is a schematic diagram of a display panel of the present application;

[0018] Figure 2 is a schematic diagram of the light adjustment layer of the present application;

[0019] Figure 3 is a schematic diagram of another display panel of the present application;

[0020] Figure 4 is a top view schematic diagram of the heat-expandable temperature-sensitive hydrogel layer of the present application;

[0021] Figure 5 is a schematic diagram of another display panel of the present application;

[0022] Figure 6 is a schematic diagram of a display device of the present application.

[0023] Among them, 100, display panel; 101, opening area; 102, non-opening area; 110, base substrate; 120, pixel driving layer; 130, light-emitting unit layer; 131, light-emitting unit; 140, encapsulation layer; 150, light adjustment layer; 151, sealing layer; 1511, sealing cavity; 152, light adjustment part; 1521, thermal expansion temperature-sensitive hydrogel layer; 153, heating part; 154, heat insulation layer; 160, pixel definition layer; 170, color filter layer; 171, color filter part; 172, black matrix; 180, control unit; 200, display device; 210, driving circuit. DETAILED DESCRIPTION

[0024] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative, but the present application can be implemented in many alternative forms and should not be construed as being limited to only the embodiments described herein.

[0025] In the description of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; "multiple" means two or more. In addition, the terms "upper", "lower", "left", "right", "vertical", "horizontal", etc. indicating orientation or positional relationships are described based on the orientation or relative positional relationships shown in the accompanying drawings, and are only for the convenience of describing the simplified description of the present application, rather than indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0026] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0027] Figure 1 is a schematic diagram of a display panel of the present application, Figure 2is a schematic diagram of the light adjustment layer of the present application, see Figure 1 to Figure 2 As shown, the present application discloses a display panel 100, which includes a base substrate 110, a pixel driving layer 120, a light emitting unit layer 130, a light adjustment layer 150 and an encapsulation layer 140, wherein the pixel driving layer 120 is arranged on the base substrate 110; the light emitting unit layer 130 is arranged on the pixel driving layer 120; the light adjustment layer 150 is arranged on the light emitting unit layer 130; the encapsulation layer 140 is arranged on the light adjustment layer 150; wherein the light adjustment layer 150 adjusts the transmittance of the light adjustment layer 150 according to the brightness of the light emitting unit layer 130; when the brightness of the light emitting unit layer 130 is lower than the preset brightness, the light transmittance of the light adjustment layer 150 increases.

[0028] The present application sets a light adjustment layer 150 and utilizes the ability of the light adjustment layer 150 to adjust the light transmittance. When the light transmittance of the light adjustment layer 150 increases, the corresponding light has a stronger ability to pass through the light adjustment layer 150, and the corresponding brightness is brighter. When the multiple light-emitting units 131 in the display panel 100 have different luminous brightness under the same driving voltage due to water and oxygen invasion caused by process reasons or package rupture, the light transmittance of the light adjustment layer 150 on the light-emitting unit 131 is adjusted to balance the different brightness of the light-emitting unit 131. When the light-emitting unit 131 emits light, the transmittance of the light adjustment layer 150 is normally adjusted to a fixed value. When it is detected that the brightness of the light emitted by the light-emitting unit 131 is low or lower than the preset brightness, the brightness of the light-emitting unit 131 is increased by increasing the light transmittance of the light adjustment layer 150 at this position. The uneven brightness of the light-emitting unit 131 caused by the process and water and oxygen invasion is balanced, and the display effect of the display panel 100 is improved. Moreover, the light adjustment layer 150 in this embodiment is arranged between the encapsulation layer 140 and the light-emitting unit layer 130, which can buffer the small protruding particles generated by the light-emitting unit layer 130 during the manufacturing process from causing pinholes or cracks in the inorganic layer in the encapsulation layer 140, thereby improving the encapsulation capability of the display panel 100.

[0029] It is understandable that when the light adjustment layer 150 is tested, the display panel 100 has an initial light transmittance, that is, when multiple light emitting units 131 emit light, the light adjustment layers 150 at different positions have the same light transmittance. When it is detected that the brightness of the light emitting unit 131 is low, the light transmittance of the light adjustment layer 150 at the corresponding position is adjusted to improve the brightness at that position. The advantage of this embodiment is that there is no need to use voltage compensation for the light emitting unit 131 in the future, and the light emitting unit 131 can be directly controlled through the optical film layer, which reduces the complexity of subsequent circuit compensation.

[0030] The light adjustment layer 150 in this embodiment can independently control the light transmittance at each position, and the light adjustment layer 150 is divided into regions for control, thereby achieving specific light transmittance adjustment at different positions.

[0031] In one embodiment, the display panel 100 includes an opening area 101 and a non-opening area 102, and the display panel 100 also includes a pixel definition layer 160. The light-emitting unit layer 130 is provided with a plurality of light-emitting units 131, and two adjacent light-emitting units 131 are separated by the pixel definition layer 160. The pixel definition layer 160 is provided in the non-opening area 102, and the light-emitting unit 131 is provided in the opening area 101.

[0032] The display panel 100 may include a plurality of display partitions, each of which is provided with at least one sub-pixel or one light-emitting unit 131. Generally speaking, one light-emitting unit 131131, i.e., one sub-pixel, is provided in one opening area 101. Three sub-pixels of different colors may form one pixel. The light adjustment unit 152 in this embodiment may correspond to one sub-pixel at a minimum. In practical applications, the area of ​​one light adjustment unit 152 may be set larger, for example, corresponding to one pixel or multiple pixels, so that the process cost is reduced and the implementation cost is lower.

[0033] Specifically, one light emitting unit 131 is taken as an example to be described.

[0034] The light adjustment layer 150 includes a sealing layer 151 and a plurality of light adjustment parts 152 . A plurality of sealing cavities 1511 are disposed in the sealing layer 151 . A light adjustment part 152 is disposed in each of the sealing cavities 1511 and is disposed in the plurality of opening areas 101 , respectively.

[0035] In one opening area 101, a light emitting unit 131 and a light adjusting unit 152 are disposed. When the brightness of the light emitting unit 131 is low due to the process of the display panel 100 or packaging failure, the light transmittance of the light adjusting unit 152 in the opening area 101 where the light emitting unit 131 is located can be set to improve the light brightness of the light emitting unit 131.

[0036] The main structure of the light adjustment part 152 in this embodiment adopts a heat-expanding temperature-sensitive hydrogel material, which produces a phase change reaction to temperature. Among them, the hydrogel material is synthesized by monomers or polymers through the formation of a water-permeable cross-linked network. The monomers are polymerized to form polymers, and then an interpenetrating polymer network (IPN) is formed through a gel process (cross-linking method). The hydrogel material can retain a large amount of water and maintain a three-dimensional network structure. The cross-linking of the condensed network can be divided into non-covalent bonds (i.e. physical cross-linking) or covalent bonds (i.e. chemical cross-linking). Hydrogels are usually jelly-like solids with elasticity.

[0037] Polymer hydrogel materials can be defined as cross-linked polymers that can swell in water and retain a large amount of water without being dissolved. The forces that induce phase transitions in polymers can be summarized into four categories: hydrophobic interactions, hydrophilic interactions (including hydrogen bonds and water solvation), van der Waals forces, and electrostatic interactions between ions. As the external environment changes, these four forces compete with each other, causing the conformation of polymer segments in the solution to change, ultimately leading to phase transitions.

[0038] When the macromolecular chain has both hydrophilic and hydrophobic groups, the linear polymer will change the conformation of the molecular chain in the aqueous solution as the solution temperature changes, from an extended random coil to a globular shape. This conformational change is generally considered to be the result of the competition between hydrophilic and hydrophobic effects. For example, materials such as polyacrylamide and polyacrylic acid have thermal expansion temperature sensitivity. Chitosan hydrogel polymers based on such polymers can have phase transition capabilities at different temperatures by adjusting their composition, and their light transmittance varies at different phase transition degrees.

[0039] Specifically, the light adjustment part 152 includes a thermal expansion thermosensitive hydrogel layer 1521, and the light adjustment layer 150 also includes a plurality of temperature rising parts 153, and the plurality of temperature rising parts 153 are respectively arranged in a plurality of the opening areas 101, and the temperature rising parts 153 are used to provide heat for the thermal expansion thermosensitive hydrogel layer 1521, and the thermal expansion thermosensitive hydrogel layer 1521 is used to absorb different amounts of heat to produce different transmittances.

[0040] The thermal expansion temperature-sensitive hydrogel layer 1521 is arranged in the sealing cavity 1511; a salt solution is also arranged in the sealing cavity 1511; and the sealing layer 151 is arranged on the temperature rising part 153. Since the thermal expansion temperature-sensitive hydrogel layer 1521 has a better phase change effect in the solution, the thermal expansion temperature-sensitive hydrogel layer 1521 can be sealed with the salt solution to achieve the encapsulation of the thermal expansion temperature-sensitive hydrogel layer 1521. The material of the sealing layer 151 can be selected from a high molecular polyethylene material to form a flexible sealing cavity 1511, and a salt solution and a thermal expansion temperature-sensitive hydrogel material can be arranged in the sealing cavity 1511. In this embodiment, the light adjustment layer 150 or the sealing layer 151 can be arranged in the form of a diaphragm and pasted to the side of the cover plate of the display panel 100 close to the base substrate 110 or to the encapsulation layer 140.

[0041] In this embodiment, the light transmittance of the thermal expansion thermosensitive hydrogel layer 1521 is adjusted mainly by the temperature raising unit 153, so that the thermal expansion thermosensitive hydrogel layer 1521 has different temperatures and realizes different phase changes. For example, when the thermal expansion thermosensitive hydrogel layer 1521 is between 25 degrees Celsius and 40 degrees Celsius, the thermal expansion thermosensitive hydrogel layer 1521 is in the first state, and when the thermal expansion thermosensitive hydrogel layer 1521 is between 0 degrees Celsius and 25 degrees Celsius, the thermal expansion thermosensitive hydrogel layer 1521 is in the second state.

[0042] When the thermal expansion temperature-sensitive hydrogel layer 1521 is in the first state, the transmittance can continuously change between 5% and 90%. Specifically, there can be two stages. For example, when the thermal expansion temperature-sensitive hydrogel layer 1521 is in the first temperature range of 25 degrees Celsius to 30 degrees Celsius, as the temperature rises, the transmittance increases linearly or nonlinearly, and gradually increases between 5% and 30%. However, when the temperature rises to the second temperature range of 30 degrees Celsius to 40 degrees Celsius, the thermal expansion temperature-sensitive hydrogel layer 1521 will undergo a phase change, and the transmittance will jump from 30% to 80% or 90%. That is, when the temperature of the thermal expansion temperature-sensitive hydrogel layer 1521 is within the second temperature range, the transmittance is basically maintained at a high level, so that the display panel 100 has a high transmittance. When the thermal expansion temperature-sensitive hydrogel layer 1521 is in the second state, the hydrogel material in the light adjustment part 152 is in a clumping state. Although there is a transmittance of 5%, due to the refraction and scattering of light, the light emitted by the light-emitting unit 131 is less and the brightness is extremely low.

[0043] Specifically, the display panel 100 further includes a control unit 180, which is used to control the temperature increase or decrease of the temperature increase unit 153, so that the light transmittance of the light adjustment unit 152 is adjustable from 0% to 90%. It is worth mentioning that, in an ideal state, the light transmittance of the light adjustment unit can be close to 100%.

[0044] Specifically, when the control unit 180 controls the temperature rise unit 153 not to work, the thermal expansion temperature sensitive hydrogel layer 1521 is at room temperature, for example, in the range of 0 degrees Celsius to 25 degrees Celsius, and the light transmittance of the thermal expansion temperature sensitive hydrogel layer 1521 is between 0% and 5%. When the display panel 100 is displaying, the light emitting unit layer 130 emits light normally, the control unit 180 controls the temperature rise unit 153 to rise to the initial preset temperature, the thermal expansion temperature sensitive hydrogel layer 1521 is in the first state, and the light transmittance of the light adjustment layer 150 is a fixed value of 5% to 90%. When the brightness of the normal light emission of the light emitting unit 131 is lower than the preset brightness, the control unit 180 controls the temperature rise unit 153 of the opening area 101 where the light emitting unit 131 is located to rise to the target temperature, the light transmittance of the thermal expansion temperature sensitive hydrogel layer 1521 increases, and the target temperature is greater than the initial preset temperature.

[0045] In this embodiment, when the light-emitting unit layer 130 emits light normally, the control unit 180 controls the temperature-raising part 153 to be heated to the initial preset temperature, the thermal expansion temperature-sensitive hydrogel layer 1521 is in the first state, and the light transmittance of the light adjustment layer 150 is a fixed value of 5% to 90%; when the brightness of the normal light emission of the light-emitting unit 131 is lower than the preset brightness, the control unit 180 controls the temperature-raising part 153 of the opening area 101 where the light-emitting unit 131 is located to be heated to the target temperature, the light transmittance of the thermal expansion temperature-sensitive hydrogel layer 1521 increases, and the target temperature is greater than the initial preset temperature. The above-mentioned temperature range can actually be adjusted by adjusting the components in the thermal expansion temperature-sensitive hydrogel layer 1521 so that the thermal expansion temperature-sensitive hydrogel layer 1521 has different temperatures at the same light transmittance, which can be specifically designed according to actual conditions. In this embodiment, only the above-mentioned temperature is used for explanation, and it is not limited to the above-mentioned temperature range.

[0046] Among them, the target temperature may be within the above-mentioned first temperature range to the second temperature range, and the initial preset temperature may be within the first temperature range. It is understandable that the target temperature of the present application may be a dynamic value, and the light transmittance may be dynamically adjusted according to the brightness of the light emitting unit 131. The preset initial temperature of the specific light emitting unit 131 may be selected according to actual conditions. For example, the light transmittance of the light adjusting unit 152 may be selected to be 10%. At this time, the light transmittance corresponding to the second target temperature must be greater than 10%. The brightness of the light emitting unit 131 may be compared with the grayscale of the light emitting unit 131 based on the detected brightness to determine whether the brightness of the light emitting unit 131 is lower than the grayscale brightness.

[0047] In another embodiment, when the light-emitting unit 131 does not emit light and the control unit 180 controls the temperature rising unit 153 not to work, the thermal expansion temperature-sensitive hydrogel layer 1521 is in the second state, and the light transmittance of the thermal expansion temperature-sensitive hydrogel layer 1521 is between 0% and 5%.

[0048] When the light-emitting unit 131 fails seriously, resulting in no light or low light emission or a bright spot, the present application can control the heat-expandable temperature-sensitive hydrogel layer 1521 at the location of the light-emitting unit 131 to be in the range of 0 degrees Celsius to 25 degrees Celsius, so that the light transmittance of the heat-expandable temperature-sensitive hydrogel layer 1521 is between 0% and 5%. At this time, the hydrogel material in the light adjustment part 152 is in a clumpy shape. Although there is a transmittance of 5%, due to the refraction and scattering of light, the light-emitting unit 131 no longer emits light, so that the position becomes a dark pixel spot, avoiding the appearance of a bright spot.

[0049] Figure 3 is a schematic diagram of another display panel of the present application, see Figure 3 As shown, when the display panel 100 of the present application is a COE display panel 100, COE (Color film on Encapsulation, forming a color filter on a thin film encapsulation structure) is a new technology to replace polarizers. The maximum transmittance of the color filter can reach 60%, which can greatly increase the brightness of the light output, thereby reducing the power consumption of the OLED device and improving the lifespan. The display panel 100 also includes a color filter layer 170, and the color filter layer 170 includes a black matrix 172 and a plurality of color filter portions 171, the black matrix 172 is arranged in the non-opening area 102, and the plurality of color filter portions 171 are respectively arranged in the plurality of opening areas 101. When the light-emitting unit 131 of the display panel 100 is not emitting light, the light transmittance of the thermal expansion temperature-sensitive hydrogel layer 1521 is controlled to be between 0% and 5%. The light that actually enters from the outside and is reflected by the metal electrode inside the display panel 100 is very small, thereby reducing the problem of ambient light reflection at this position. The ambient light can be effectively absorbed, and the problem of color separation or glare caused by the ambient light entering the display panel 100100 and then being reflected by the metal electrode is avoided, thereby improving the display effect of the display panel 100.

[0050] In one embodiment, the light adjustment layer 150 further includes a heat insulating layer 154, which is arranged to wrap the temperature rising part 153 and the sealing layer 151, and the heat insulating layer 154 is used for heat insulation and heat preservation. The heat insulating layer 154 has the functions of heat preservation and heat insulation. When the temperature rising part 153 heats the thermal expansion temperature sensitive hydrogel layer 1521, the temperature of the thermal expansion temperature sensitive hydrogel layer 1521 is maintained by the action of the heat insulating layer 154, so that it remains in the second state or the third state. It can be formed of a light-transmitting inorganic or organic polymer material, such as a zirconium oxide ceramic material, polyester, polyimide film and other materials. Through the excellent heat insulation performance of the above materials, the influence of the ambient temperature on the thermal expansion temperature sensitive hydrogel layer 1521 can also be reduced as much as possible.

[0051] In this embodiment, the control unit 180 controls the temperature rising part 153 to adjust the thermal expansion temperature-sensitive hydrogel layer 1521. For the material selection of the temperature rising part 153, a resistive heating element can be used to heat the thermal expansion temperature-sensitive hydrogel layer 1521 by the principle of resistive heating. The electrical control method has the advantages of high accuracy and strong controllability, but it requires circuit design and is relatively complex.

[0052] In another embodiment, the temperature-raising part 153 can also use an absorbing temperature-raising material to convert it into a temperature rise after absorbing ultrasound. The absorbing material can absorb or weaken the electromagnetic wave energy projected on its surface, and convert the electromagnetic wave energy into heat energy or other forms through the dielectric loss or magnetic loss of the material. The absorbing temperature-raising material includes a graphene / vanadium dioxide composite aerogel material or a ceramic absorbing fiber material. The graphene / vanadium dioxide composite aerogel material has a temperature-raising function under ultrasound, and has different temperature-raising gradients under ultrasound of different wavelengths. For example, the longer the wavelength, the higher the temperature rises. Of course, ultrasound of the same wavelength can also be used to adjust the time parameters to make the temperature-raising part 153 reach the target temperature. The representative of the ceramic absorbing fiber material is silicon carbide (SiC). In silicon carbide (SiC), the wavelength of 2GHz to 7GHz is a low absorption frequency band, and the absorption degree of ultrasound is low. The wavelength of 8GHz to 18GHz is a high absorption frequency band, and the absorption degree of ultrasound can reach up to 90%. Rapid heating to the target temperature is achieved by adjusting the wavelength and time parameters.

[0053] The above-mentioned wave-absorbing and heating material needs to absorb external wave sources to generate heat. The frequency, wave intensity and time of ultrasound will affect the temperature of thermal conversion of the wave-absorbing material. Therefore, by adjusting this, the heat change of the thermal expansion temperature-sensitive hydrogel layer 1521 can be completed, and the existence of the heat insulation layer 154 after heating will also maintain the internal temperature to ensure the phase change stability of the hydrogel. The control unit 180 can be an ultrasonic emission structure, which is arranged on the back or shell of the display panel 100.

[0054] Figure 4 is a top view schematic diagram of the heat-expandable temperature-sensitive hydrogel layer of the present application, see Figure 4 As shown, the thickness of the thermal expansion temperature-sensitive hydrogel layer 1521 is between 1um and 5um; under the orthographic projection of the base substrate 110, the projection width of the thermal expansion temperature-sensitive hydrogel layer 1521 is greater than or equal to the width of the opening area 101. In this embodiment, the width of the thermal expansion temperature-sensitive hydrogel layer 1521 is appropriately greater than the width of the opening area 101 where the light emitting unit 131 is located, so that the light emitted by the light emitting unit 131 needs to be adjusted from the light adjusting part 152.

[0055] In another embodiment, the number of light-emitting units 131 corresponding to the light adjustment part 152 in a sealed cavity 1511 may also be multiple. For example, the light-emitting unit layer 130 includes multiple red light-emitting units 131, multiple green light-emitting units 131 and multiple blue light-emitting units 131. The red light-emitting units 131, the green light-emitting units 131 and the blue light-emitting units 131 are respectively located in the opening area 101. On the orthographic projection of the base substrate 110, three opening areas 101 can be arranged within the projection range of the sealed cavity 1511; the three opening areas 101 are respectively provided with red light-emitting units 131, green light-emitting units 131 and blue light-emitting units 131.

[0056] Figure 5 is a schematic diagram of another display panel of the present application, see Figure 5 As shown, the light adjustment layer 150 of the present application can also be controlled as a whole. For example, when the display panel 100 is performing high-brightness display, the light adjustment layer 150 is controlled to have a higher light transmittance. When the display panel 100 is performing low-brightness display, especially when not displaying, the light adjustment layer 150 is controlled to have a lower light transmittance, so that the black state of the display panel 100 is darker when not displaying, and there will be no glare problem when displaying at low brightness. When the display panel 100 is performing high grayscale display, the light adjustment layer 150 is adjusted to a higher light transmittance. At this time, even if ambient light enters the interior of the display panel 100, due to the high display grayscale of the display panel 100, the addition of ambient light has little effect on the display effect, and will not affect the original emitted light, and thus will not affect the display effect.

[0057] Specifically, when the light-emitting unit layer 130 emits light normally, the light adjustment layer 150 is in a first state, and the light transmittance of the light adjustment layer 150 is a fixed value of 5% to 90%; when the brightness of the light-emitting unit layer 130 when emitting light normally is lower than the preset brightness, the transmittance of the light adjustment layer 150 increases.

[0058] In another embodiment, when the light emitting unit 131 does not emit light, the light adjusting layer 150 is in the second state, and the light transmittance of the light adjusting layer 150 is between 0% and 5%;

[0059] It can be understood that the method of dynamically adjusting light transmittance in this embodiment is also applicable to the above-mentioned partitioned embodiments. The thermal expansion temperature-sensitive hydrogel layer 1521 can be placed in the first state, and the light transmittance of the light adjustment layer 150 can be changed from a fixed value of 5% to 90% to a dynamic value.

[0060] Specifically, it can be dynamically adjusted according to the light emitting brightness of the light emitting unit 131. The light emitting intensity of the light emitting unit layer 130 can be determined according to the grayscale, with grayscales ranging from 0 to 255. The higher the grayscale number, the greater the light emitting intensity of the light emitting unit 131. On the contrary, the smaller the grayscale number, the smaller the light emitting intensity of the light emitting unit 131. Therefore, the light emitting intensity of the light emitting unit layer 130 can be determined by determining the display grayscale of the display panel 100. In this embodiment, a grayscale between 0 and 127 is a low grayscale, and a grayscale between 128 and 255 is a high grayscale.

[0061] For example, when the gray scale of the display panel 100 is between 0 and 127, the control unit 180 controls the temperature-raising layer to rise to the first temperature range, for example, between 25 degrees Celsius and 30 degrees Celsius, and the thermal expansion temperature-sensitive hydrogel layer 1521 is in the first state, at which the transmittance can continuously change between 5% and 90%. For example, when the gray scale of the display panel 100 is between 127 and 255, the control unit 180 controls the temperature-raising layer to rise to the second temperature range, for example, between 30 degrees Celsius and 40 degrees Celsius, and the thermal expansion temperature-sensitive hydrogel layer 1521 is in the first state, at which the thermal expansion temperature-sensitive hydrogel layer 1521 undergoes a phase change, and the transmittance jumps from 30% to 80% or 90%. That is, when the temperature of the thermal expansion temperature-sensitive hydrogel layer 1521 is within the second temperature range, the transmittance is basically maintained at a high level, so that the display panel 100 has a high transmittance.

[0062] In this embodiment, by setting a light adjustment layer 150 and utilizing the function of the light adjustment layer 150 that can adjust the transmittance, when the display panel 100 is not displayed or is displayed at a low grayscale, the light adjustment layer 150 is adjusted to a lower transmittance, so that the external ambient light enters the interior of the display panel 100 as little as possible, and the external ambient light is effectively absorbed, so that the black state of the display panel 100 is darker when not displayed, and there will be no glare problem when the low brightness is displayed. When the display panel 100 is displayed at a high grayscale, the light adjustment layer 150 is adjusted to a higher transmittance. At this time, even if the ambient light enters the interior of the display panel 100, due to the high display grayscale of the display panel 100, the addition of ambient light has little effect on the display effect, and will not affect the original emitted light, and thus will not affect the display effect. By setting the light adjustment layer 150, the present application can cancel the design of the polarizer or color filter, and utilize the transmittance adjustment of the light adjustment layer 150 to filter the external ambient light and improve the quality of the display panel 100.

[0063] Figure 6 is a schematic diagram of the display device of the present application, see Figure 6 As shown, the present application also discloses a display device, the display device 200 includes a driving circuit 210 and a display panel 100, the display panel 100 can be any display panel 100 in the above embodiments, wherein the driving circuit is used to drive the display panel 100 to display.

[0064] It should be noted that the inventive concept of the present application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the embodiments or technical features are combined, the original technical effects will be enhanced.

[0065] The above content is a further detailed description of the present application in combination with specific optional implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be deemed to fall within the scope of protection of the present application.

Claims

1. A display panel, characterized in that: include: substrate substrate; A pixel driving layer is arranged on the base substrate; A light emitting unit layer, arranged on the pixel driving layer; A light adjustment layer, disposed on the light emitting unit layer; as well as An encapsulation layer, disposed on the light adjustment layer; The light adjustment layer adjusts the transmittance of the light adjustment layer according to the brightness of the light emitting unit layer; when the brightness of the light emitting unit layer is lower than a preset brightness, the transmittance of the light adjustment layer increases.

2. The display panel according to claim 1, characterized in that: When the light-emitting unit layer emits light normally, the light-adjusting layer is in a first state, and the light transmittance of the light-adjusting layer is a fixed value between 5% and 90%; When the brightness of the light-emitting unit layer during normal light emission is lower than the preset brightness, the transmittance of the light adjustment layer increases.

3. The display panel according to claim 1, characterized in that: The display panel includes an opening area and a non-opening area. The display panel further comprises a pixel definition layer, the light emitting unit layer is provided with a plurality of light emitting units, two adjacent light emitting units are separated by the pixel definition layer, the pixel definition layer is provided in the non-opening area, and the light emitting units are provided in the opening area; The light adjustment layer comprises a sealing layer and a plurality of light adjustment parts, a plurality of sealing cavities are arranged in the sealing layer, a light adjustment part is arranged in each of the sealing cavities, and the light adjustment parts are arranged in the plurality of opening areas respectively; Wherein, the light transmittance of the light adjustment part is adjustable from 0% to 90%.

4. The display panel according to claim 3, characterized in that: The light adjustment part includes a heat-expandable temperature-sensitive hydrogel layer, and the light adjustment layer also includes a plurality of temperature-raising parts, which are respectively arranged in the plurality of opening areas, and the temperature-raising parts are used to provide heat for the heat-expandable temperature-sensitive hydrogel layer, and the heat-expandable temperature-sensitive hydrogel layer is used to absorb different amounts of heat to generate different transmittances; The display panel further includes a control unit, and the control unit is used to control the temperature increase or decrease of the temperature of the temperature increase unit; When the light-emitting unit layer emits light normally, the control unit controls the temperature-raising part to rise to the initial preset temperature, the thermal expansion temperature-sensitive hydrogel layer is in the first state, and the light transmittance of the light adjustment layer is a fixed value of 5% to 90%; When the brightness of the normal light emitted by the light-emitting unit is lower than the preset brightness, the control unit controls the temperature rising part of the opening area where the light-emitting unit is located to rise to the target temperature, the light transmittance of the thermal expansion temperature-sensitive hydrogel layer increases, and the target temperature is greater than the initial preset temperature.

5. The display panel according to claim 4, characterized in that: The light adjustment layer further comprises a heat insulation layer, the heat insulation layer wraps the temperature rising part and the sealing layer, and the heat insulation layer is used for heat insulation and heat preservation.

6. The display panel according to claim 4, characterized in that: The temperature increasing part is formed by wave absorbing and temperature increasing material, and is used for converting the absorbed ultrasonic waves into temperature increase.

7. The display panel according to claim 4, characterized in that: The thickness of the thermal expansion temperature sensitive hydrogel layer is between 1um and 5um; Under the orthographic projection of the base substrate, the projection width of the thermal expansion temperature-sensitive hydrogel layer is greater than or equal to the width of the opening area.

8. The display panel according to claim 4, characterized in that: When the light-emitting unit does not emit light and the control unit controls the temperature-raising unit not to work, the thermal expansion temperature-sensitive hydrogel layer is in a second state, and the light transmittance of the thermal expansion temperature-sensitive hydrogel layer is between 0% and 5%.

9. The display panel according to claim 3, characterized in that: The light-emitting unit layer includes a plurality of red light-emitting units, a plurality of green light-emitting units and a plurality of blue light-emitting units, wherein the red light-emitting units, the green light-emitting units and the blue light-emitting units are respectively located in the opening area, and on the orthographic projection of the base substrate, there is at least one opening area within the projection range of the sealed cavity; The display panel further includes a color filter layer, which includes a black matrix and a plurality of color filter portions. The black matrix is ​​arranged in the non-opening area, and the plurality of color filter portions are respectively arranged in the plurality of opening areas.

10. A display device, characterized in that: It comprises a driving circuit and the display panel according to any one of claims 1 to 9, wherein the driving circuit is used to drive the display panel to display.

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