A display panel and display device

Abstract

The application discloses a display panel and a display device, the display panel comprising: a driving substrate comprising a plurality of first driving circuits and second driving circuits; a light emitting device layer located on one side of the driving substrate; the light emitting device layer comprising a plurality of light emitting devices; an electrochromic device layer located between the driving substrate and the light emitting device layer; the electrochromic device layer comprising a plurality of electrochromic devices; the first driving circuit is electrically connected with the electrochromic device, and the second driving circuit is electrically connected with the light emitting device; the first driving circuit is used for controlling the color of the electrochromic device; the second driving circuit is used for controlling the light emitting brightness of the light emitting device; and the electrochromic device is used for reflecting the light emitted by the light emitting device towards the side of the driving substrate. The display panel disclosed by the application can improve the light emitting intensity, color gamut and uniformity of the light emitting device by controlling the reflectivity of the electrochromic layer, changing the microcavity length of the light emitting device, and improving the display effect of the display panel.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a display panel and a display device. Background Technology

[0002] Currently, the microdisplay industry typically uses a structure that stacks white organic light-emitting diodes (OLEDs) with color filter layers to achieve color. In this structure, the anode thickness and structure are identical for pixels of different colors, preventing white OLEDs from maximizing the microcavity effect and improving the luminous efficiency of different color pixel regions. Since white OLEDs synthesize white light from red, green, and blue luminescent materials, considering only the cavity length of one color leads to significant losses in the other two colors. Therefore, achieving consistent luminous efficiency across different colors has become a pressing issue. Summary of the Invention

[0003] The present invention provides a display panel and a display device to improve the light intensity, color gamut and uniformity of light-emitting devices, thereby improving the display effect of the display panel.

[0004] In a first aspect, the present invention provides a display panel, comprising: The driving substrate includes multiple first driving circuits and second driving circuits. A light-emitting device layer is located on one side of the driving substrate; the light-emitting device layer includes a plurality of light-emitting devices; An electrochromic device layer is located between the driving substrate and the light-emitting device layer; the electrochromic device layer includes a plurality of electrochromic devices. The first driving circuit is electrically connected to the electrochromic device, and the second driving circuit is electrically connected to the light-emitting device; the first driving circuit is used to control the color of the electrochromic device; the second driving circuit is used to control the luminous brightness of the light-emitting device; the electrochromic device is used to reflect the light emitted by the light-emitting device toward the driving substrate; wherein, the electrochromic devices of different colors have different refractive indices for the light emitted by the light-emitting device.

[0005] Optionally, an insulating structure is provided between the electrochromic device and the first driving circuit; The insulating structure includes a first via, which is filled with a first conductor; the electrochromic device is electrically connected to the first driving circuit through the first conductor in the first via.

[0006] Optional, also includes: The first pixel definition layer includes a plurality of first openings and spacing structures surrounding each of the first openings; the electrochromic device and the insulating structure are both located within the first openings; The spacing structure includes a second via; the second via is filled with a second conductor; the light-emitting device is electrically connected to the second driving circuit through the second conductor in the second via.

[0007] Optionally, the material of the first conductor is the same as the material of the second conductor.

[0008] Optional, also includes: A second pixel definition layer; the second pixel definition layer includes a plurality of second openings; in a direction perpendicular to the plane where the driving substrate is located, the first opening overlaps with the second opening; The light-emitting device is located inside the second opening.

[0009] Optionally, the electrochromic device includes at least a reflective electrode layer, an electrochromic functional layer, and a transparent conductive layer; The electrochromic functional layer is located between the reflective electrode layer and the transparent conductive layer; the reflective electrode layer is located on the side of the transparent conductive layer closer to the driving substrate.

[0010] Optionally, the light-emitting device includes at least a transparent anode layer, a light-emitting functional layer, and a transparent cathode layer; The light-emitting functional layer is located between the transparent anode layer and the transparent cathode layer.

[0011] Optionally, the transparent anode layer is located on the side of the transparent cathode layer closest to the electrochromic functional layer; The transparent anode layer is reused as the transparent conductive layer.

[0012] Optional, also includes: An encapsulation layer is located on the side of the light-emitting device layer that faces away from the driving substrate; A color filter layer is located on the side of the encapsulation layer opposite to the driving substrate; the color filter layer includes a first color filter layer, a third color filter layer, and a third color filter layer respectively disposed corresponding to different light-emitting devices.

[0013] In a second aspect, the present invention provides a display device, comprising: the display panel described in the first aspect of the present invention.

[0014] The technical solution provided by this invention involves setting an electrochromic layer between a driving substrate and a light-emitting device layer. This allows a first driving circuit and a second driving circuit in the driving substrate to be electrically connected to the electrochromic device in the electrochromic device layer and the light-emitting device in the light-emitting device layer, respectively. The second driving circuit can control the brightness of the light-emitting device, and the first driving circuit can control the color of the electrochromic device. By changing the color of the electrochromic device in the electrochromic layer, the refractive index of the electrochromic device on the light emitted from the light-emitting device can be controlled, thereby changing the microcavity length of the light-emitting device. This allows the microcavity effect to be utilized to improve the light extraction efficiency of the light-emitting device, thereby increasing the light intensity, color gamut, and uniformity of the light-emitting device, which is beneficial for improving the display effect of the display panel. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of another display panel structure provided in an embodiment of the present invention; Figure 3 A top view of a display panel provided in an embodiment of the present invention; Figure 4 A top view of another display panel provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of an electrochromic device provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a light-emitting device provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a light-emitting device and an electrochromic device provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the fabrication structure of a display panel provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0017] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention, such as... Figure 1As shown, the display panel 100 includes: a driving substrate 110, including a plurality of first driving circuits 111 and second driving circuits 112; a light-emitting device layer 120 located on one side of the driving substrate 110; the light-emitting device layer 120 includes a plurality of light-emitting devices 121; an electrochromic device layer 130 located between the driving substrate 110 and the light-emitting device layer 120; the electrochromic device layer 130 includes a plurality of electrochromic devices 131; the first driving circuits 111 are electrically connected to the electrochromic devices 131, and the second driving circuits 112 are electrically connected to the light-emitting devices 121; the first driving circuits 111 are used to control the color of the electrochromic devices 131, and the second driving circuits 112 are used to control the light emission brightness of the light-emitting devices 121; the electrochromic devices 131 are used to reflect the light emitted by the light-emitting devices 121 toward the driving substrate 110.

[0018] In this design, multiple first driving circuits 111 and second driving circuits 112 in the driving substrate 110 are electrically connected to the electrochromic device 131 and the light-emitting device 121, respectively, for driving the electrochromic device 131 and the light-emitting device 121 to operate. The light-emitting device layer 120 includes multiple light-emitting devices 121 for emitting light, emitting light to the side of the light-emitting device 121 facing the driving substrate 110 and the side of the light-emitting device 121 facing away from the driving substrate 110, such as... Figure 1 The middle arrow points to.

[0019] Specifically, the electrochromic device 131 includes an electrochromic material that can undergo a stable and reversible color change under the action of an applied electric field to alter its optical properties. An electrochromic device layer 130 is disposed between the light-emitting device layer 120 and the driving circuit layer 110. The electrochromic device 131 in this layer is electrically connected to a corresponding first driving circuit 111, enabling the first driving circuit 111 to provide an electrochromic control signal to the electrochromic device 131 to control the electric field applied to it, causing the electrochromic device 131 to change color under the control of this electric field. Since the electrochromic device 131 has different optical properties under different colors, such as different refractive indices, the first driving circuit 111 can provide different electrochromic control signals to the electrochromic device 131, resulting in different refractive indices. The electrochromic control signal provided by the first driving circuit 111 can be a voltage signal. That is, by providing different voltages to the electrochromic device 131, different electric fields are applied to the electrochromic device, thereby making the electrochromic device 131 have different colors, that is, the electrochromic device 131 has different refractive indices.

[0020] The light-emitting device 121 in the light-emitting device layer 120 can be an OLED. The light-emitting device 121 and its corresponding second driving circuit 112 are electrically connected. The second driving circuit 112 can provide a driving signal to the light-emitting device 121 to control the light-emitting brightness of the light-emitting device 121. Part of the light emitted by the light-emitting device 121 is emitted along the side away from the driving substrate 110, and the other part is emitted towards the driving substrate 110. The light emitted from the side away from the driving substrate 110 can reach the display surface of the display panel 100 after passing through the film layers on the side of the light-emitting device 121 away from the driving substrate 110. However, the light emitted towards the driving substrate 110 cannot directly reach the display surface of the display panel 100. But this part of the light can propagate to the electrochromic device 131, so that this part of the light can be reflected by the electrochromic device 131 and continue to be emitted from the side away from the driving substrate 110, and finally reach the display surface of the display panel 100, thereby reducing the light loss of the light-emitting device 121 and improving the light emission efficiency of the light-emitting device 121. The driving signal provided by the second driving circuit 112 to the light-emitting device 121 can be a driving current signal, so that the light-emitting device can emit light under the control of the driving current signal.

[0021] Furthermore, the display panel 100 may include pixel areas 210, 220, and 230 of different colors, such as red, green, and blue pixel areas. Since the light emitted from pixel areas of different colors differs, the display panel 100 can achieve color display by controlling the light emission brightness of the light-emitting devices 131 in different pixel areas. The light emitted by the light-emitting devices 131 in the different colored pixel areas may be the same or different. In an exemplary embodiment, the light-emitting devices in the different colored pixel areas can all be white OLEDs. In this case, other film layers, such as color filters, can be used to make the different colored pixel areas display different colors of light.

[0022] When the light-emitting device 121 emits light, its light extraction efficiency is related to its microcavity length due to the microcavity effect. Specifically, when the microcavity length of the light-emitting device 121 is on the same order of magnitude as the wavelength of the emitted light, the optical characteristics of the light-emitting device 121 change, selectively enhancing light of a specific wavelength. Thus, by controlling the microcavity length of the light-emitting device 121, a greater light extraction effect can be achieved for the corresponding color. However, when the light-emitting devices 121 in different color pixel areas are all white OLEDs, their structures are identical, resulting in identical microcavity lengths for each device. This means that the microcavity length of the light-emitting device can only be considered for the emitted light color of a particular pixel area. This leads to a higher light extraction efficiency for one color pixel area and a lower efficiency for other pixel areas, resulting in uneven display and even color shift.

[0023] Since the formula for calculating the length of a microcavity is: ,in Let d be the refractive index of the light emitted from the light-emitting device 121. i The distance between the anode and cathode of the light-emitting device 121 is [missing information]. The angle of reflection of light. The wavelength of light. Let d be the order of the microcavity; therefore, by changing d... i The length of the microcavity of the light-emitting device 121 can be changed by n and / or d. Typically, after the display panel 100 is manufactured, d... i If the value is fixed, the microcavity length of the light-emitting device 121 can be changed by changing the refractive index n of the light emitted from the light-emitting device 121. In this embodiment of the invention, the first driving circuit 111 can provide different electrochromic control signals to the electrochromic device 131 located on the side of the light-emitting device 121 near the driving substrate 110, which can change the refractive index of the electrochromic device 131 so that the electrochromic devices 131 located in different color pixel areas can match the refractive index required by different wavelengths of light. For example, the electrochromic device 131 in the blue pixel area can match the refractive index required by blue light. Thus, the light emitted from the light-emitting device 121 in the blue pixel area reaches its corresponding electrochromic device 131 and is reflected by the electrochromic device 131, which can selectively enhance the intensity of blue light in the light emitted from the light-emitting device 121, so that the blue light emitted from the blue pixel area has a high light extraction efficiency. Similarly, the electrochromic device 131 in the red pixel area can match the refractive index required by red light, and the electrochromic device 131 in the green pixel area can match the refractive index required by green light. In this way, the requirements for the microcavity length of the light-emitting device 121 in pixel areas of different colors can be met at the same time, so that pixel areas of different colors can have high light extraction efficiency.

[0024] This invention provides an electrochromic layer between a driving substrate and a light-emitting device layer. A first driving circuit and a second driving circuit in the driving substrate are electrically connected to the electrochromic device in the electrochromic device layer and the light-emitting device in the light-emitting device layer, respectively. This allows the second driving circuit to control the brightness of the light-emitting device, and the first driving circuit to control the color of the electrochromic device. By changing the color of the electrochromic device in the electrochromic layer, the refractive index of the electrochromic device on the light emitted from the light-emitting device can be controlled, thereby changing the microcavity length of the light-emitting device. This utilizes the microcavity effect to improve the light extraction efficiency of the light-emitting device, thereby increasing its light intensity, color gamut, and uniformity, ultimately improving the display effect of the display panel.

[0025] It is understood that each light-emitting device can be a white OLED or a light-emitting device of a different color, depending on actual needs. The above example only illustrates the situation where all light-emitting devices are white OLEDs, demonstrating how the electrochromic device can change the microcavity length of the light-emitting device. In the embodiments of this invention, when different light-emitting devices have different emission colors, the electrochromic device can also be used to change the microcavity length of the light-emitting device. The technical principle is similar to that of the above-mentioned white OLED device, and will not be repeated here.

[0026] Optional, continue to refer to Figure 1 The display panel 100 also includes an encapsulation layer 170 located on the side of the light-emitting device layer 120 away from the driving substrate 110; a color filter layer 180 located on the side of the encapsulation layer 170 away from the driving substrate 110; the color filter layer 180 includes a first color filter layer 181, a second color filter layer 182 and a third color filter layer 183 respectively disposed corresponding to different light-emitting devices 121.

[0027] The encapsulation layer 170 primarily prevents water, mist, or impurities from the outside air from entering the light-emitting device 121 and damaging its structure, thereby improving its lifespan. The encapsulation layer 170 can be a thin-film encapsulation layer, such as a multi-layered encapsulation structure comprising an inorganic layer, an organic layer, and an inorganic layer. The inorganic layer prevents water or mist from entering, while the organic layer absorbs any impurities, ensuring effective encapsulation. The color filter layer 180 is crucial for achieving color display. Its main components include resin and pigments, which color the light as it passes through. The color filter layer 180 includes a first color filter layer 181, a first color filter layer 182, and a third color filter layer 183, each corresponding to a different light-emitting device 121. For example, the first color filter layer 181, the second color filter layer 182, and the third color filter layer 183 can be red, green, and blue, respectively. When the light-emitting device 121 emits white light, the white light passes through different colored filter layers, resulting in different coloring effects. Specifically, the red filter layer allows only red light to pass through, the blue filter layer allows only blue light to pass through, and the green filter layer allows only light to pass through. This ensures that the light-emitting device 121 emits light of the corresponding color after passing through each color filter layer, enabling the display panel 100 to achieve color display. Furthermore, since different colored filter layers allow only their corresponding colors of light to pass through, they can block other colors of light from passing through, thus preventing color bleeding and improving the contrast of the display panel 100.

[0028] Optional, Figure 2 This is a schematic diagram of another display panel structure provided in an embodiment of the present invention, such as... Figure 2 As shown, an insulating structure 140 is provided between the electrochromic device 131 in the display panel 100 and the first driving circuit 111; the insulating structure 140 includes a first via 141, and a first conductor 142 is filled in the first via 141; the electrochromic device 131 is electrically connected to the first driving circuit 111 through the first conductor 142 in the first via 141.

[0029] Specifically, by providing an insulating structure 140 between the electrochromic device 131 and the first driving circuit 111, the signals transmitted between the electrochromic device 131 and the first driving circuit 111 can be prevented from interfering with each other, thereby improving the accuracy of the signals transmitted by the first driving circuit 111 and the color-changing accuracy of the electrochromic device 131. The first via 141 is filled with a first conductor 142, which electrically connects the electrochromic device 131 and the first driving circuit 111, ensuring that the electrochromic control signal output by the first driving circuit 111 can be transmitted to the electrochromic device 131.

[0030] In an optional embodiment, the material of the first conductor 142 may include tungsten, thereby giving the first conductor 142 stable conductivity. The first conductor 142 can be fabricated by processes such as sputtering or deposition; it can be formed first at a corresponding position on the driving substrate 110, and then the gaps in the first conductor 142 are filled with an insulating structure 140; alternatively, the insulating structure 140 can be formed first on the driving substrate 110, patterned to form a first via 141, and then the first conductor 142 is filled into the first via 141.

[0031] It is understood that the above-described formation process of the first conductor 142 and the insulating structure 140 is merely an illustrative example and can be designed according to actual needs. This embodiment of the invention does not impose specific limitations in this regard. Correspondingly, the number of first conductors 142 corresponding to each electrochromic device 131 can be one or more, and this embodiment of the invention does not impose specific limitations in this regard. For example... Figure 3 A top view of a display panel provided in an embodiment of the present invention, such as... Figure 3 As shown, each electrochromic device 131 can correspond to three first conductors 142 to reduce the impedance of the electrochromic control signal transmitted from the first driving circuit 111 to the electrochromic device 131.

[0032] Optional, continue to refer to Figure 2 The display panel 100 also includes a first pixel definition layer 150, which includes a plurality of first openings 151 and spacer structures 152 surrounding each of the first openings 151; the electrochromic device 131 and the insulating structure 140 are both located within the first openings 151; the spacer structure 152 includes a second via 1521; the second via 1521 is filled with a second conductor 153; the light-emitting device is electrically connected to the second driving circuit 112 through the second conductor 153 in the second via 1521.

[0033] Specifically, the multiple spacing structures 152 of the first pixel definition layer 150 ensure that the electrochromic devices 131 located in the first openings 151 on both sides of the spacing structure 152 do not interfere with each other and are isolated from each other to prevent color mixing. The second via 1521 is filled with a second conductor 153, which electrically connects the light-emitting device 121 to the second driving circuit 112, ensuring that the light-emitting control signal output by the second driving circuit 112 can be transmitted to the light-emitting device 121.

[0034] In an optional embodiment, the material of the second conductor 153 may include tungsten, thereby giving the second conductor 153 stable conductivity. The second conductor can be fabricated using processes such as sputtering or deposition; the second conductor 153 can be formed first at a corresponding position on the driving substrate 110, and then the gaps in the second conductor 153 can be filled with spacer structures 152; alternatively, spacer structures 152 can be formed first on the driving substrate 110, and the spacer structures 152 can be patterned to form second vias 1521, and then the second conductor 153 can be filled into the second vias 1521.

[0035] It is understood that the above-described formation process of the second conductor 153 and the spacing structure 152 is merely an illustrative example and can be designed according to actual needs. This embodiment of the invention does not impose specific limitations on this. Correspondingly, the number of second conductors 153 corresponding to each light-emitting device 121 can be one or more, and this embodiment of the invention does not impose specific limitations on this. For example, Figure 4 A top view of another display panel provided in an embodiment of the present invention, such as... Figure 4 As shown, each light-emitting device 121 can correspond to three second conductors 153 to reduce the impedance of the light-emitting control signal transmitted from the second driving circuit 112 to the light-emitting device 121.

[0036] Optionally, the material of the first conductor 142 is the same as the material of the second conductor 153. For example, the material of the conductor can be tungsten or the like. In this way, by using the same material for the first conductor 142 and the second conductor 153, the first conductor and the second conductor 153 can be manufactured using the same material under the same manufacturing process, simplifying the process and saving costs.

[0037] It is understandable that, since there is an insulating structure 140 and an electrochromic device 131 between the light-emitting device 121 and the driving substrate 110, the fabrication height of the first conductor is smaller than that of the second conductor 153, but the cross-sectional area can be the same, so that the driving substrate 110 can transmit electrical signals to the electrochromic device 131 and the light-emitting device 121 through the first conductor 142 and the second conductor 153 respectively.

[0038] Optional, continue to refer to Figure 2 The display panel 100 also includes a second pixel definition layer 160; the second pixel definition layer 160 includes a plurality of second openings 161; in a direction perpendicular to the plane of the driving substrate 110, the first opening 151 and the second opening 161 overlap; the light-emitting device 121 is located in the second opening 161.

[0039] Specifically, the multiple light-emitting devices 121 in the second pixel definition layer 160 are used to emit light of the same or different colors, such as green, blue, red or white. Part of the light emitted by the light-emitting device 121 is emitted along the side away from the driving substrate 110, and the other part is emitted towards the driving substrate 110. The light emitted from the side away from the driving substrate 110 can reach the display surface of the display panel 100 after passing through the various film layers of the light-emitting device 121 on the side away from the driving substrate 110. However, the light emitted towards the driving substrate 110 cannot directly reach the display surface of the display panel 100. But in the direction perpendicular to the plane where the driving substrate 110 is located, the multiple second openings 161 in the second pixel definition layer 160 overlap with the multiple second openings 161 in the first pixel definition layer 150, so that this part of the light can propagate to the electrochromic device 131. After being reflected by the electrochromic device 131, it continues to be emitted from the side away from the driving substrate 110 and finally reaches the display surface of the display panel 100, thereby reducing the light loss of the light-emitting device 121 and improving the light emission efficiency of the light-emitting device 121.

[0040] Optional, Figure 5 This is a schematic diagram of the structure of an electrochromic device provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the electrochromic device 131 includes at least a reflective electrode layer 1311, an electrochromic functional layer 1312, and a transparent conductive layer 1313; the electrochromic functional layer 1312 is located between the reflective electrode layer 1311 and the transparent conductive layer 1313; the reflective electrode layer 1311 is located on the side of the transparent conductive layer 1313 near the driving substrate 110.

[0041] The reflective electrode layer 1311 may be made of a cathode material such as silver, giving it a high reflectivity. The electrochromic functional layer 1312 may include an ion storage layer, a dielectric layer, and an electrochromic layer sequentially disposed from one side of the driving substrate 110. The ion storage layer and the electrolyte layer may be transparent films used to store ions, and the electrochromic layer is used to change the refractive index of light. The transparent conductive layer 1313 may include an anode material such as ITO or IZO, allowing light refracted by the electrochromic functional layer 1312 to pass through the transparent conductive layer 1313 before exiting.

[0042] Specifically, the light emitted from the side of the light-emitting device 121 facing the driving substrate 110 can propagate to the reflective electrode layer 1311 in the electrochromic device 131. The reflective electrode layer 131 can reflect this light to the electrochromic functional layer 1312. Furthermore, the electrochromic functional layer 1312 refracts this light and emits it to the transparent conductive layer 1313. The transparent conductive layer 1313 continues to propagate this part of the light to the side of the light-emitting device 121 away from the driving substrate 110, and finally it can reach the display surface of the display panel 100, so as to reduce the light loss of the light-emitting device 121 and improve the light emission efficiency of the light-emitting device 121.

[0043] Optional, Figure 6 This is a schematic diagram of a light-emitting device provided in an embodiment of the present invention, in conjunction with reference to the reference. Figure 2 and Figure 6 As shown, the light-emitting device 121 includes at least a transparent anode layer 1211, a light-emitting functional layer 1212, and a transparent cathode layer 1213; the light-emitting functional layer 1212 is located between the transparent anode layer 1211 and the transparent cathode layer 1213.

[0044] The transparent anode layer 1211 may be made of anode materials such as ITO or IZO, allowing light to pass through the transparent anode layer 1211 and exit from the side of the transparent anode layer 1211 away from the driving substrate 110. The transparent cathode layer 1213 may be made of cathode materials such as ITO or IZO, allowing light emitted from the light-emitting functional layer 1212 to pass through the transparent cathode layer 1213 and exit from the side of the transparent cathode layer 1213 away from the driving substrate 110. The transparent anode layer 1211 and the transparent cathode layer 1213 provide holes and electrons for the light-emitting device 121, enabling current to be generated within the light-emitting device 121 and allowing it to emit light normally. The light-emitting functional layer 1212 may include, in sequence, a hole injection layer HIL-2, a hole transport layer HTL-2, a light-emitting layer EML-2, an electron transport layer ETL-2, an electron injection layer EIL-2, a charge generation layer CGL, a hole injection layer HIL-1, a hole transport layer HTL-1, a light-emitting layer EML-1, an electron transport layer ETL-1, and an electron injection layer EIL-1. The electron injection layer EIL modifies the cathode and transports electrons to the electron transport layer ETL. The electron transport layer ETL is responsible for transporting electrons from the cathode to the light-emitting layer EML of the device. The hole injection layer HIL modifies the anode of the device and allows holes from the anode to be smoothly injected into the hole transport layer HTL. The hole transport layer HTL is responsible for transporting holes to the light-emitting layer EML. The light-emitting layer EML is where electrons and holes recombine to form excitons, and then the excitons degenerate to emit light. The charge generation layer CGL is used to generate and separate charges.

[0045] Specifically, by applying electrical signals to the transparent anode layer 1211 and the transparent cathode layer 1213 respectively, the transparent anode layer 1211 provides holes and the transparent cathode layer 1213 provides electrons. After applying electrical signals to the transparent anode layer 1211 and the transparent cathode layer 1213, an electric field is generated. Under the action of this electric field, the charge generation layer CGL can generate electrons and holes. At this time, the holes provided by the transparent anode layer 1211 are transported to the light-emitting layer EML-2 in sequence through the hole injection layer HIL-2 and the hole transport layer HTL-2. The electrons generated by the charge generation layer CGL are transported to the light-emitting layer EML-2 in sequence through the electron injection layer EIL-2 and the electron transport layer ETL-2. After the electrons and holes recombine in the light-emitting layer EML-2, they excite photons and emit light. Similarly, electrons provided by the transparent cathode 1213 are sequentially transported to the light-emitting layer EML-1 via the electron injection layer EIL-1 and the electron transport layer ETL-1; while holes generated by the charge generation layer CGL are sequentially transported to the light-emitting layer EML-1 via the hole injection layer HIL-1 and the hole transport layer HTL-1, so that electrons and holes recombine in the light-emitting layer EML-1 to excite photons and emit light; thus, the emitted light colors of the light-emitting layers EML-1 and EML-2 can be the same or different. When the emitted light colors of the light-emitting layers EML-1 and EML-2 are different, the light emitted by the light-emitting layers EML-1 and EML-2 can be combined to form white light. In an exemplary embodiment, the light emitted by the light-emitting layer EML-2 can be blue, and the light emitted by the light-emitting layer EML-1 can include green and red. The light emitted by the light-emitting layers EML-1 and EML-2 can pass through the transparent anode layer 1211 to reach the electrochromic device, and can also pass through the transparent cathode layer 1213 to reach the display surface of the display panel 100.

[0046] Optional, Figure 7 This is a schematic diagram of the structure of a light-emitting device and an electrochromic device provided in an embodiment of the present invention, as shown below. Figure 7 As shown, the transparent anode layer 1211 is located on the side of the transparent cathode layer 1213 near the electrochromic functional layer 1312.

[0047] In this design, the transparent anode layer 1211 is reused as the transparent conductive layer 1313. This reduces the number of film layers in the display panel 100, making the structure of the display panel 100 more compact, simplifying the manufacturing process, reducing costs, and facilitating the thinning and lightening of the display panel 100.

[0048] In an optional embodiment, Figure 8 This is a schematic diagram of the fabrication structure of the display panel provided in an embodiment of the present invention, as shown below. Figure 8As shown, firstly, a first conductor 142 and a second conductor 153 are formed at corresponding positions on the driving substrate 100. The height of the second conductor 153 is greater than the height of the first conductor 142, and it can be fabricated by processes such as sputtering or deposition. Then, the gap between the first conductor 142 and the second conductor 153 is filled with an insulating structure 140 and a spacer structure 152. Secondly, an electrochromic device 131 can be fabricated by processes such as sputtering or deposition. Then, the electrochromic device 131 covering the first conductor 142 is removed by processes such as exposure, development, and etching, exposing the first conductor 142. Next, after the first conductor 142 is exposed, a layer of transparent conductive metal is sputtered or vapor-deposited above the electrochromic device 131 as the transparent anode layer 1211 of the light-emitting device 121, and then the transparent anode layer 1211 is patterned; and after the transparent anode layer 1211 is patterned, a pixel limiting layer 162 is formed to limit the position of the light-emitting device, avoid electrical crosstalk between adjacent pixels, and improve the color gamut; after the pixel limiting layer 162 is prepared, a light-emitting functional layer and a transparent cathode layer are formed on the transparent anode layer 1211 by sputtering or vapor deposition to prepare the light-emitting device 121; after the light-emitting device 121 is prepared, an encapsulation layer 170 is prepared by deposition and / or coating techniques to encapsulate the light-emitting device 121; a color filter layer 180 is prepared above the encapsulation layer 170 by spraying or other processes so that different pixel areas can emit light of different colors.

[0049] It is understood that the above description of the formation process of the display panel 100 is merely an exemplary illustration and can be designed according to actual needs. This embodiment of the invention does not impose specific limitations on this process. Based on the same inventive concept, this embodiment of the invention also provides a display device, which includes the display panel of any embodiment of the invention. Therefore, this display device possesses the technical features and beneficial effects of the display panel provided by this embodiment of the invention. Similarities can be found in the above description and will not be repeated here.

[0050] For example, Figure 9 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention, such as... Figure 9 As shown, the display device 200 can be VR glasses, and the lenses of the VR glasses include the display panel 100 in this embodiment of the invention. In other embodiments, the display device 200 can also be other microdisplay devices, which are not specifically limited here.

[0051] Since the display device provided in the embodiments of the present invention includes the display panel provided in any embodiment of the present invention, the display device provided in the embodiments of the present invention includes the corresponding functional modules of the display panel, and can achieve the beneficial effects of the display panel provided in the embodiments of the present invention. Technical details not described in detail in the above embodiments can be found in the above description of the display panel provided in the embodiments of the present invention.

[0052] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that, include: The driving substrate includes multiple first driving circuits and second driving circuits. A light-emitting device layer is located on one side of the driving substrate; the light-emitting device layer includes a plurality of light-emitting devices; An electrochromic device layer is located between the driving substrate and the light-emitting device layer; the electrochromic device layer includes a plurality of electrochromic devices. The first driving circuit is electrically connected to the electrochromic device, and the second driving circuit is electrically connected to the light-emitting device; the first driving circuit is used to control the color of the electrochromic device; the second driving circuit is used to control the luminous brightness of the light-emitting device; the electrochromic device is used to reflect the light emitted by the light-emitting device toward the driving substrate; wherein, the electrochromic devices of different colors have different refractive indices for the light emitted by the light-emitting device. The electrochromic device includes at least a reflective electrode layer, an electrochromic functional layer, and a transparent conductive layer; The electrochromic functional layer is located between the reflective electrode layer and the transparent conductive layer; the reflective electrode layer is located on the side of the transparent conductive layer closer to the driving substrate.

2. The display panel according to claim 1, characterized in that, An insulating structure is provided between the electrochromic device and the first driving circuit; The insulating structure includes a first via, which is filled with a first conductor; the electrochromic device is electrically connected to the first driving circuit through the first conductor in the first via.

3. The display panel according to claim 2, characterized in that, Also includes: The first pixel definition layer includes a plurality of first openings and spacing structures surrounding each of the first openings; the electrochromic device and the insulating structure are both located within the first openings; The spacing structure includes a second via; the second via is filled with a second conductor; the light-emitting device is electrically connected to the second driving circuit through the second conductor in the second via.

4. The display panel according to claim 3, characterized in that, The material of the first conductor is the same as the material of the second conductor.

5. The display panel according to claim 3, characterized in that, Also includes: Second pixel definition layer; the second pixel definition layer includes a plurality of second openings; In a direction perpendicular to the plane of the driving substrate, the first opening overlaps with the second opening; The light-emitting device is located inside the second opening.

6. The display panel according to claim 1, characterized in that, The light-emitting device includes at least a transparent anode layer, a light-emitting functional layer, and a transparent cathode layer; The light-emitting functional layer is located between the transparent anode layer and the transparent cathode layer.

7. The display panel according to claim 6, characterized in that, The transparent anode layer is located on the side of the transparent cathode layer that is close to the electrochromic functional layer; The transparent anode layer is reused as the transparent conductive layer.

8. The display panel according to claim 1, characterized in that, Also includes: An encapsulation layer is located on the side of the light-emitting device layer that faces away from the driving substrate; A color filter layer is located on the side of the encapsulation layer opposite to the driving substrate; the color filter layer includes a first color filter layer, a third color filter layer, and a third color filter layer respectively disposed corresponding to different light-emitting devices.

9. A display device, characterized in that, include: The display panel according to any one of claims 1-8.

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