Display device

Abstract

The invention discloses a display device, the display device comprises a substrate, a display function layer, an electro-dimming layer and cover plate glass, the display function layer is located between the substrate and the cover plate glass, and the electro-dimming layer is located on the side, away from the substrate, of the display function layer; the dimming circuit is electrically connected with the electrochromic dimming layer; the working modes of the display device comprise a first display mode and a dimming display mode; in the first display mode, the transmittance of the electro-dimming layer is greater than or equal to a first transmittance threshold value; in the dimming display mode, the dimming circuit is used for providing a first electric driving signal for the electrochromic dimming layer, so that the transmittance of the electrochromic dimming layer is smaller than a second transmittance threshold value, and the second transmittance threshold value is smaller than or equal to the first transmittance threshold value. According to the invention, the light emitted by the display function layer in the dimming display mode is emitted through the low-transmittance electro-dimming layer, so that the display difference between the sub-pixels can be reduced, and the display effect of a low-gray-scale picture is improved.

Description

Technical Field

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

[0002] Currently, due to issues such as manufacturing processes, some display devices have slight differences between transistors or light-emitting elements in different sub-pixels of the display device.

[0003] Specifically, under low-brightness display, the device differences between different sub-pixels in the display device are magnified, resulting in poor display effects of the display device on low grayscale images, affecting the display effect. Summary of the Invention

[0004] The present invention provides a display device to solve the problem of poor display effect of low grayscale images in existing display devices.

[0005] According to one aspect of the present invention, there is provided a display device, comprising:

[0006] A base substrate, a display function layer, an electroluminescent layer, and a cover glass, wherein the display function layer is located between the base substrate and the cover glass, and the electroluminescent layer is located on a side of the display function layer away from the base substrate;

[0007] a dimming circuit, the dimming circuit being electrically connected to the electroluminescent dimming layer;

[0008] The operating modes of the display device include a first display mode and a dimming display mode;

[0009] In the first display mode, the transmittance of the electroluminescent layer is greater than or equal to a first transmittance threshold;

[0010] In the dimming display mode, the dimming circuit is used to provide a first electrical driving signal to the electroluminescent layer, so that the transmittance of the electroluminescent layer is less than a second transmittance threshold, and the second transmittance threshold is less than or equal to the first transmittance threshold.

[0011] In the present invention, an electroluminescent layer and a dimming circuit are added to the display device. The electroluminescent layer is located on the side of the display functional layer away from the base substrate. The dimming circuit can adjust the voltage of the electroluminescent layer so that the transmittance of the electroluminescent layer is greater than or equal to the first transmittance threshold in the first display mode, and the transmittance of the electroluminescent layer is less than the second transmittance threshold in the dimming display mode. In the present invention, in the dimming display mode, the light emitted by the display functional layer is emitted through the low-transmittance electroluminescent layer, which can reduce the display difference between different sub-pixels in the display device, thereby improving undesirable phenomena such as smear color deviation and uneven display. Correspondingly, it can improve the uniformity of actual display brightness between different sub-pixels in the display device, optimize the display effect of the display device on low grayscale images, and improve the display effect of the display device on low grayscale images.

[0012] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 is a schematic diagram of a sub-pixel provided by an embodiment of the present invention;

[0015] Figure 2 is a schematic diagram of a display device provided by an embodiment of the present invention;

[0016] Figure 3 is a schematic diagram of another display device provided by an embodiment of the present invention;

[0017] Figure 4 is a schematic diagram of another display device provided by an embodiment of the present invention;

[0018] Figure 5 is a schematic diagram of another display device provided by an embodiment of the present invention;

[0019] Figure 6 is a schematic diagram of another display device provided by an embodiment of the present invention;

[0020] Figure 7 is a schematic diagram of another display device provided by an embodiment of the present invention;

[0021] Figure 8is a schematic diagram of another display device provided by an embodiment of the present invention;

[0022] Figure 9 is a schematic diagram of another display device provided by an embodiment of the present invention;

[0023] Figure 10 is a partial schematic diagram of a touch electrode provided by an embodiment of the present invention;

[0024] Figure 11 is a partial schematic diagram of a touch electrode block provided by an embodiment of the present invention;

[0025] Figure 12 is a schematic diagram of another display device provided by an embodiment of the present invention;

[0026] Figure 13 is a schematic diagram of another display device provided by an embodiment of the present invention;

[0027] Figure 14 is a schematic diagram of another display device provided by an embodiment of the present invention;

[0028] Figure 15 is a schematic diagram of another display device provided by an embodiment of the present invention;

[0029] Figure 16 is a schematic diagram of another display device provided by an embodiment of the present invention;

[0030] Figure 17 is a schematic diagram of another display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0032] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] Currently, some display devices, such as OLED display devices, have poor display quality on low grayscale images, which may cause undesirable phenomena such as smearing, color cast, and uneven display, seriously affecting the user experience. The low grayscale image display of the display device is also called low brightness display.

[0034] An OLED display device is used as an example for description. Figure 1 is a schematic diagram of a sub-pixel provided by an embodiment of the present invention, such as Figure 1 As shown, the sub-pixel includes a pixel circuit 11 and a light-emitting element 12. The optional pixel circuit 11 is a 7T1C structure, where "T" is a transistor and "C" is a capacitor. The pixel circuit 11 includes a first dimming transistor T1, a data writing transistor T2, a driving transistor T3, a threshold compensation transistor T4, an initialization transistor T5, a second dimming transistor T6, an anode reset transistor T7 and a storage capacitor Cst. The optional light-emitting element 12 is an organic light-emitting diode. However, it is not limited to this. In other embodiments, the pixel circuit can be selected as a 7T2C, 8T1C, 8T2C or other structure; the light-emitting element can also be other types of light-emitting elements. In theory, the light-emitting voltage and current of the sub-pixel in low-brightness display are smaller, and the light-emitting voltage and current of the sub-pixel in high-brightness display are larger. Due to issues such as manufacturing process, there are slight differences between devices such as transistors or light-emitting elements of different sub-pixels in the display device. Under low-brightness display, due to the small light-emitting voltage and current of the sub-pixels, the device differences between different sub-pixels are amplified, making the display differences caused by the individual differences and characteristics of different sub-pixels in the display device more obvious, thereby causing the display device to display abnormalities in low grayscale images, seriously affecting the display effect.

[0035] In order to solve the above technical problems and improve the display effect of the display device on low grayscale images, the display device provided by the embodiment of the present invention is provided with an electroluminescent layer on the side of the display function layer away from the base substrate. Specifically, Figure 2 is a schematic diagram of a display device provided by an embodiment of the present invention, Figure 3is a schematic diagram of another display device provided by an embodiment of the present invention, Figure 4 is a schematic diagram of another display device provided by an embodiment of the present invention, Figure 5 FIG. 1 is a schematic diagram of another display device provided by an embodiment of the present invention. Figures 2 to 5 As shown, the display device includes: a base substrate 101, a display function layer 102, an electroluminescent layer 104 and a cover glass 103, wherein the display function layer 102 is located between the base substrate 101 and the cover glass 103, and the electroluminescent layer 104 is located on the side of the display function layer 102 away from the base substrate 101; a dimming circuit 105, wherein the dimming circuit 105 is electrically connected to the electroluminescent layer 104; the working modes of the display device include a first display mode and a dimming display mode; in the first display mode, the transmittance of the electroluminescent layer 104 is greater than or equal to the first transmittance threshold; in the dimming display mode, the dimming circuit 105 is used to provide a first electrical driving signal to the electroluminescent layer 104, so that the transmittance of the electroluminescent layer 104 is less than the second transmittance threshold, and the second transmittance threshold is less than or equal to the first transmittance threshold.

[0036] In this embodiment, the display device includes a base substrate 101. The base substrate 101 serves as the basic supporting layer of the entire display device and can be made of materials such as glass or polyimide (PI). The embodiment of the present invention does not specifically limit the specific process of the base substrate 101.

[0037] The display device also includes cover glass 103, which serves as a protective cover layer. This cover glass 103 protects the various functional layers between the base substrate 101 and the cover glass 103. Especially for the now-widely used touch-sensitive display devices, the provision of this cover glass 103 effectively prevents scratches on the functional layers within the display device by a touch-sensitive subject (such as a user's finger or stylus) during touch operations. The cover glass 103 also serves to isolate external impurities and stray light, improving the reliability, stability, and display quality of the display device.

[0038] The display device also includes a display function layer 102, which is disposed between the base substrate 101 and the cover glass 103. It is understood that at least other functional film layers for display driving are included between the base substrate 101 and the display function layer 102, and at least other functional film layers for display driving are included between the display function layer 102 and the cover glass 103. This embodiment of the present invention does not specifically limit the functional film layers between the base substrate 101 and the display function layer 102, or between the display function layer 102 and the cover glass 103.

[0039] The display function layer 102 includes a plurality of sub-pixels 106. Specifically, the display device has a display area AA and a non-display area NA. The display area AA is an area for displaying images. The display function layer 102 is at least partially located in the display area AA. The display area AA is provided with a plurality of sub-pixels 106. Specifically, the vertical projection of the optional display function layer 102 on the base substrate 101 covers at least the display area AA. The non-display area NA is a peripheral area provided at least partially around the display area AA. The non-display area NA is an area used for wiring and implementing other auxiliary functions. The multiple sub-pixels 106 in the display function layer 102 may include a plurality of red sub-pixels, a plurality of green sub-pixels, and a plurality of blue sub-pixels. The red sub-pixels, green sub-pixels, and blue sub-pixels are arranged according to certain rules. The arrangement can be set according to actual display requirements and is not specifically limited. By combining the red sub-pixels, green sub-pixels, and blue sub-pixels, a color image can be displayed. The display device can be an organic light-emitting diode (OLED) display device, and the sub-pixels 106 include organic light-emitting diodes. In other embodiments, the display device may be a liquid crystal display device or other type of display device, and a sub-pixel is the smallest independent display unit. The display function layer 102 is a multi-layer stacked structure. The specific structure of the display function layer 102 in the display device varies depending on the display type and is not specifically limited here.

[0040] The display device further includes an electroluminescent layer 104, which is located on the side of the display function layer 102 that is away from the base substrate 101. It can be understood that the electroluminescent layer 104 is conductive, so the electroluminescent layer 104 is insulated from other metal layers or other conductive layers in the display device. Based on this, the specific position of the electroluminescent layer 104 in the display device can be reasonably designed, provided that the added electroluminescent layer 104 does not affect the normal operation of the display device. Figure 2 As shown, the optional electroluminescent layer 104 is located between the display function layer 102 and the cover glass 103. Figure 3 As shown, the optional electroluminescent layer 104 is located on the side of the cover glass 103 away from the display function layer 102. Figure 4 As shown, the optional cover glass 103 comprises a multi-layer stacked structure, and the electroluminescent layer 104 is a layer within the multi-layer stack of the cover glass 103. The electroluminescent layer 104 is at least partially located in the display area AA. Specifically, the vertical projection of the electroluminescent layer 104 on the base substrate 101 at least covers the display area AA; and / or the vertical projection of the electroluminescent layer 104 on the base substrate 101 at least covers the display function layer 102.

[0041] The display device also includes a dimming circuit 105, which is electrically connected to the electro-dimming layer 104. The non-display area NA includes the dimming circuit 105, which is electrically connected to the electro-dimming layer 104 through a signal line. Specifically, the optional dimming circuit 105 includes an input end and an output end. The output end of the optional dimming circuit 105 is electrically connected to the electro-dimming layer 104, and the output end of the dimming circuit 105 provides an electrical driving signal to the electro-dimming layer 104. The input end of the optional dimming circuit 105 is electrically connected to the electro-dimming layer 104, and the input end of the dimming circuit 105 collects the electrical signal of the electro-dimming layer 104. Based on the output electrical driving signal and the input electrical signal, the dimming circuit 105 can adaptively adjust the size of the output electrical driving signal, thereby adjusting the transmittance of the electro-dimming layer 104, and realizing flexible adjustment so that the transmittance of the electro-dimming layer 104 reaches any desired transmittance. The optional display device further includes a driver IC 107 , and the dimming circuit 105 may be integrated into the driver IC 107 , but is not limited thereto.

[0042] The display device is pre-configured with multiple transmittance thresholds, including at least a first transmittance threshold and a second transmittance threshold, where the first transmittance threshold is greater than or equal to the second transmittance threshold. Practitioners can design the first and second transmittance thresholds based on product requirements. For example, the first transmittance threshold is greater than the second transmittance threshold, e.g., the first transmittance threshold is 90% and the second transmittance threshold is 85%. For example, the first transmittance threshold is equal to the second transmittance threshold, e.g., the second transmittance threshold is 90%.

[0043] There are multiple display modes preset in the display device, and the multiple display modes include at least a low-brightness display mode. The dimming display mode of the optional display device is a low-brightness display mode; accordingly, the first display mode of the display device is any other display mode different from the low-brightness display mode. The optional driver IC 107 can control the display mode of the display device to switch according to display requirements or user instructions, and based on the display mode of the display device, send corresponding dimming instructions to the dimming circuit 105. When the display device switches to the first display mode, the dimming circuit 105 controls the transmittance of the electroluminescent layer 104 to be greater than or equal to the first transmittance threshold. When the display device switches to the dimming display mode, the dimming circuit 105 provides a first electrical drive signal to the electroluminescent layer 104 to change the voltage of the electroluminescent layer 104, so that the transmittance of the electroluminescent layer 104 is less than the second transmittance threshold, and the second transmittance threshold is less than or equal to the first transmittance threshold. In other words, according to the dimming control of the dimming circuit 105 , the transmittance of the electroluminescent layer 104 in the dimming display mode is lower than that in the first display mode. Specifically, the transmittance of the electroluminescent layer 104 in the low-brightness display mode is lower than that in the first display mode.

[0044] The material of the electroluminescent layer 104 may include an inorganic metal compound or an organic metal compound. The material of the electroluminescent layer 104 may include at least one of indium tin oxide, tungsten trioxide, vanadium dioxide, nickel oxide, an organic metal, and a liquid electrolyte. The materials of the electroluminescent layer 104 include, but are not limited to, the above examples. The electroluminescent layer 104 may be formed by a deposition process on the side of the display function layer 102 facing away from the base substrate 101. In other embodiments, the electroluminescent layer may also be an organic material film layer or an inorganic material film layer containing conductive particles, wherein the organic material film layer or the inorganic material film layer containing conductive particles has conductivity; other processes may also be used to form the electroluminescent layer on the side of the display function layer facing away from the base substrate.

[0045] In this embodiment, an electroluminescent layer 104 is provided on the side of the display functional layer 102 facing away from the base substrate 101. Specifically, in the first display mode, the voltage of the electroluminescent layer 104 is adjusted to ensure that the transmittance of the electroluminescent layer 104 is high, greater than or equal to a first transmittance threshold. Light emitted by the display functional layer 102 passes through the high-transmittance electroluminescent layer 104 before being emitted. The addition of the electroluminescent layer 104 does not affect the display effect of the display device. Compared with the first display mode, in the dimming display mode (that is, the low-brightness display mode), the voltage of the electroluminescent layer 104 is adjusted to reduce the transmittance of the electroluminescent layer 104, so that the transmittance of the electroluminescent layer 104 is a low transmittance less than the second transmittance threshold, and the light emitted by the display function layer 102 passes through the low-transmittance electroluminescent layer 104 and then exits. The electroluminescent layer 104 added in this way can reduce the display difference between different sub-pixels 106 in the display device in the low-brightness display mode, avoid the device difference fluctuation between different sub-pixels 106, and thus improve the undesirable phenomena such as smear color deviation and display unevenness, and accordingly can improve the actual display brightness uniformity between different sub-pixels 103 in the display device, and optimize the display effect of the display device on low grayscale images.

[0046] In addition, the display device only adjusts the voltage of the electroluminescent layer 104 through the dimming circuit 105 in the dimming display mode, which does not significantly increase the power consumption of the display device and has a low impact on power consumption.

[0047] In other embodiments, the dimming display mode is not limited to the low-brightness display mode. When dimming is required, the display device switches to the dimming display mode. In the dimming display mode, the dimming circuit 105 is configured to provide a first electrical driving signal to the electro-dimming layer 104 so that the transmittance of the electro-dimming layer 104 is less than a second transmittance threshold. The dimming circuit 105 controls the voltage of the electro-dimming layer 104 so that the transmittance of the electro-dimming layer 104 is adjusted to a desired transmittance.

[0048] Optionally, in the first display mode, the dimming circuit 105 is disconnected from the electro-dimming layer 104. In the dimming display mode, the dimming circuit 105 is configured to provide a first electrical drive signal to the electro-dimming layer 104, causing the transmittance of the electro-dimming layer 104 to be less than a second transmittance threshold, which is less than or equal to the first transmittance threshold. Alternatively, the electro-dimming layer 104 may be a first type electro-dimming layer, with the first electrical drive signal being less than 0V; alternatively, the electro-dimming layer 104 may be a second type electro-dimming layer, with the first electrical drive signal being greater than 0V.

[0049] In this embodiment, the transmittance of the electro-modulating layer 104 is adjusted by controlling the path between the dimming circuit 105 and the electro-modulating layer 104 to be disconnected or connected, and the magnitude of the first electrical drive signal can be flexibly adjusted. Specifically, in the first display mode, the dimming circuit 105 is disconnected from the electro-modulating layer 104, that is, the electro-modulating layer 104 is turned off, and the transmittance of the electro-modulating layer 104 in the non-powered state is greater than or equal to the first transmittance threshold. In the dimming display mode, the dimming circuit 105 is connected to the electro-modulating layer 104, that is, the electro-modulating layer 104 is turned on, and the transmittance of the electro-modulating layer 104 in the powered state is controlled by the first electrical drive signal provided by the dimming circuit 105, so that the transmittance of the electro-modulating layer 104 is less than the second transmittance threshold. By flexibly adjusting the magnitude of the first electrical drive signal, the transmittance of the electro-modulating layer 104 can also be adjusted to any desired transmittance.

[0050] There are multiple types of electro-optical layer 104, including at least a first type electro-optical layer and a second type electro-optical layer. The transmittance of the first type electro-optical layer increases as the input electrical drive signal increases, and the transmittance of the first type electro-optical layer also decreases as the input electrical drive signal decreases. The transmittance of the second type electro-optical layer decreases as the input electrical drive signal increases, and the transmittance of the second type electro-optical layer also increases as the input electrical drive signal decreases. With respect to the above-mentioned scheme of "adjusting the transmittance of the electro-optical layer 104 by controlling the path between the dimming circuit 105 and the electro-optical layer 104 to be disconnected or connected," in the first display mode, the dimming circuit 105 and the electro-optical layer 104 are disconnected, which can be understood as the electro-optical layer 104 being connected to 0V or ground.

[0051] When the electroluminescent layer 104 is a first type electroluminescent layer, the first electrical driving signal provided to the first type electroluminescent layer by the dimming circuit 105 can be less than 0V in the dimming display mode. Then, the transmittance of the first type electroluminescent layer is less than that of the electroluminescent layer driven by 0V. That is, the transmittance of the first type electroluminescent layer in the dimming display mode is less than the transmittance in the first display mode.

[0052] When the electroluminescent layer 104 is a second-type electroluminescent layer, the first electrical driving signal provided to the second-type electroluminescent layer by the dimming circuit 105 can be greater than 0V in the dimming display mode. Then, the transmittance of the second-type electroluminescent layer is less than that of the electroluminescent layer driven by 0V. That is, the transmittance of the second-type electroluminescent layer in the dimming display mode is less than that in the first display mode.

[0053] In other embodiments, the dimming circuit can optionally provide a second electric drive signal to the electro-dimming layer in the first display mode. In the dimming display mode, the dimming circuit is used to provide a first electric drive signal to the electro-dimming layer so that the transmittance of the electro-dimming layer is less than the second transmittance threshold, and the second transmittance threshold is less than or equal to the first transmittance threshold. The electro-dimming layer can be optionally a first type electro-dimming layer, and the first electric drive signal is less than the second electric drive signal; or, the electro-dimming layer can be a second type electro-dimming layer, and the first electric drive signal is greater than the second electric drive signal. The second electric drive signal can be optionally 0V. By controlling the electric drive signal output by the dimming circuit, the transmittance of the electro-dimming layer can be flexibly adjusted, and the size of the first electric drive signal and the second electric drive signal can be flexibly adjusted. The dimming circuit and the electro-dimming layer remain conductive, and the transmittance of the electro-dimming layer is controlled by the size of the electric drive signal provided by the dimming circuit. Specifically, in the first display mode, the dimming circuit provides a second electrical drive signal to the electro-dimming layer, causing the transmittance of the electro-dimming layer to be greater than or equal to the first transmittance threshold. By flexibly adjusting the magnitude of the second electrical drive signal, the transmittance of the electro-dimming layer can be adjusted to any desired transmittance. Similarly, in the dimming display mode, the dimming circuit provides a first electrical drive signal to the electro-dimming layer, causing the transmittance of the electro-dimming layer to be less than the second transmittance threshold. By flexibly adjusting the magnitude of the first electrical drive signal, the transmittance of the electro-dimming layer can be adjusted to any desired transmittance.

[0054] As described above, the transmittance of the first type of electro-optical dimming layer increases as the input electrical drive signal increases, and the transmittance of the first type of electro-optical dimming layer also decreases as the input electrical drive signal decreases. The transmittance of the second type of electro-optical dimming layer decreases as the input electrical drive signal increases, and the transmittance of the second type of electro-optical dimming layer also increases as the input electrical drive signal decreases. With respect to the above-mentioned scheme of "adjusting the transmittance of the electro-optical dimming layer by controlling the electrical drive signal output by the dimming circuit", in the first display mode, the dimming circuit provides a second electrical drive signal to the electro-optical dimming layer. When the electro-optical dimming layer is a first type of electro-optical dimming layer, the dimming circuit can optionally provide a first electrical drive signal that is smaller than the second electrical drive signal to the first type of electro-optical dimming layer in the dimming display mode, so that the transmittance of the first type of electro-optical dimming layer in the dimming display mode is smaller than the transmittance in the first display mode; if the second electrical drive signal is equal to 0V, the first electrical drive signal is smaller than 0V. When the electro-luminescent layer is a second type electro-luminescent layer, the dimming circuit can optionally provide a first electrical driving signal greater than the second electrical driving signal to the second type electro-luminescent layer in the dimming display mode, so that the transmittance of the second type electro-luminescent layer in the dimming display mode is less than the transmittance in the first display mode; if the second electrical driving signal is equal to 0V, the first electrical driving signal is greater than 0V.

[0055] In the present invention, an electroluminescent layer and a dimming circuit are added to the display device. The electroluminescent layer is located on the side of the display functional layer away from the base substrate. The dimming circuit can adjust the voltage of the electroluminescent layer so that the transmittance of the electroluminescent layer is greater than or equal to the first transmittance threshold in the first display mode, and the transmittance of the electroluminescent layer is less than the second transmittance threshold in the dimming display mode. In the present invention, in the dimming display mode, the light emitted by the display functional layer is emitted through the low-transmittance electroluminescent layer, which can reduce the display difference between different sub-pixels in the display device, thereby improving undesirable phenomena such as smear color deviation and uneven display. Correspondingly, it can improve the uniformity of actual display brightness between different sub-pixels in the display device, optimize the display effect of the display device on low grayscale images, and improve the display effect of the display device on low grayscale images.

[0056] like Figure 2 As shown, the optional electroluminescent layer 104 is located between the display function layer 102 and the cover glass 103. The material of the optional electroluminescent layer 104 includes an inorganic metal compound.

[0057] In this embodiment, multiple other functional film layers are further included between the display functional layer 102 and the cover glass 103, and the electroluminescent layer 104 is disposed between the display functional layer 102 and the cover glass 103. The multiple functional film layers in the display device include a metal layer. Insulation is provided between the electroluminescent layer 104 and the metal layer in the display device to prevent the voltage supplied to the electroluminescent layer 104 from affecting the metal layer in the display device, thereby ensuring normal display operation of the display device. Specifically, at least one insulating layer may be present between the electroluminescent layer 104 and the metal layer in the display functional layer 102 to insulate the electroluminescent layer 104 from the display functional layer 102. The electroluminescent layer 104 may be disposed on the side of the cover glass 103 facing the base substrate 101, or at least one insulating layer may be present between the electroluminescent layer 104 and the cover glass 103 to insulate the electroluminescent layer 104 from the cover glass 103.

[0058] When the electroluminescent layer 104 is located between the display functional layer 102 and the cover glass 103, the material of the electroluminescent layer 104 may include an inorganic metal compound. The thickness of the film layer made of the inorganic metal compound material can be less than the thickness of the film layer made of the organic metal compound material. Based on this, the electroluminescent layer 104 made of the inorganic metal compound material can be made of a smaller thickness, which does not significantly increase the thickness of the display device and is conducive to the thinning of the display device. In other embodiments, when the electroluminescent layer is located between the display functional layer and the cover glass, the material of the electroluminescent layer may also include at least one of an organic metal compound and an inorganic metal compound, which is not specifically limited here.

[0059] like Figure 3 As shown, the optional electroluminescent layer 104 is located on the side of the cover glass 103 facing away from the base substrate 101 .

[0060] In this embodiment, the electroluminescent layer 104 is disposed on the side of the cover glass 103 facing away from the base substrate 101. The electroluminescent layer 104 can be disposed on the side of the cover glass 103 facing away from the base substrate 101, or at least one insulating layer can be present between the electroluminescent layer 104 and the cover glass 103 to insulate the electroluminescent layer 104 from the cover glass 103. Optional materials for the electroluminescent layer 104 include at least one of an inorganic metal compound and an organometallic compound, and are not specifically limited herein.

[0061] Figure 6 is a schematic diagram of another display device provided by an embodiment of the present invention, combined with Figure 4 and Figure 6As shown, the optional cover glass 103 includes at least one protective layer, and the at least one protective layer includes an electrochromic layer 104. Here, the electrochromic layer 104 is integrated into the cover glass 103, that is, the electrochromic protective glass is directly used as the cover glass 103.

[0062] In this embodiment, the optional cover glass 103 is a multi-layer stacking structure. Exemplarily, the cover glass 103 includes at least two protective layers, namely the cover body 103a and the anti-reflection layer 103d. The anti-reflection layer 103d can resist the problem of total reflection of light to improve the display effect of the display device. The anti-reflection layer 103d is located on the side of the cover body 103a away from the base substrate 101. In other embodiments, the optional anti-reflection layer is located on the side of the cover body facing the base substrate, or, the anti-reflection layer is provided on both sides of the optional cover body. It can be understood that the multi-layer stacking structure of the cover glass 103 is not limited to Figure 4 and Figure 6 As shown, no specific limitation is given here.

[0063] The electro-dimming layer 104 can be disposed between the two protective layers of the cover glass 103. Specifically, the electro-dimming layer 104 can be disposed between the cover body 103a and the anti-reflection layer 103d. Furthermore, the electro-dimming layer 104 is insulated from the protective layers of the cover glass 103. Optionally, an insulating layer 103b is disposed between the electro-dimming layer 104 and the cover body 103a, and an insulating layer 103c is disposed between the electro-dimming layer 104 and the anti-reflection layer 103d. The material of the electro-dimming layer 104 can include at least one of an inorganic metal compound and an organometallic compound, and is not specifically limited herein.

[0064] In other embodiments, the electroluminescent layer can be reused as a protective layer in the cover glass, that is, an original protective layer in the cover glass is replaced with a protective layer with electroluminescent function, without increasing the thickness of the cover glass.

[0065] In the present invention, the material of the electroluminescent layer, the location of the electroluminescent layer in the display device, and the number of stacked electroluminescent layers can be reasonably selected based on product requirements, without specific limitations. For example, the electroluminescent layer can be a single-layer structure, such as an electroluminescent layer made of ITO material; or, the electroluminescent layer can be a multi-layer stacked structure, with any layer made of an organic metal compound material or an inorganic metal compound material; or, the display device can include multiple independent and spaced electroluminescent layers, such as an electroluminescent layer disposed between the display functional layer and the cover glass, and another electroluminescent layer disposed on the side of the cover glass facing away from the base substrate.

[0066] In this embodiment, an electroluminescent layer 104 is added to the display device. The electroluminescent layer 104 is disposed on the side of the display functional layer 102 that faces away from the base substrate 101. In the dimming display mode, the transmittance of the electroluminescent layer 104 is less than a second transmittance threshold. Light emitted by the display functional layer 102 is emitted through the low-transmittance electroluminescent layer 104. This can reduce the display differences between different sub-pixels 106 in the display device and optimize the display effect of the display device on low grayscale images.

[0067] Figure 7 is a schematic diagram of another display device provided by an embodiment of the present invention, such as Figure 7 The display device shown also includes: multiple functional film layers located between the display functional layer 102 and the cover glass 103, the multiple functional film layers including at least an encapsulation structure 108 and a touch structure 109. The encapsulation structure 108 is disposed on the side of the display functional layer 102 facing away from the base substrate 101. The touch structure 109 is disposed on the side of the encapsulation structure 108 facing away from the base substrate 101. The optional encapsulation structure 108 is a multi-layer stacked structure, comprising inorganic encapsulation layers and organic encapsulation layers that are stacked and alternately distributed. The encapsulation structure 108 can achieve an encapsulation effect on the display functional layer 102, thereby effectively preventing impurities such as moisture from the external environment from entering the display functional layer 102. The optional touch structure 109 is a multi-layer stacked structure, comprising multiple metal layers that are stacked, and the touch structure 109 can achieve a touch effect on the display device.

[0068] It can be understood that, depending on product requirements, the multiple functional film layers located between the display functional layer 102 and the cover glass 103 in the display device also include other structures, which are not specifically limited here; illustratively, the multiple functional film layers located between the display functional layer and the cover glass in the display device also include a polarizing layer, and the polarizing layer is located on the side of the touch structure away from the base substrate.

[0069] Figure 8 is a schematic diagram of another display device provided by an embodiment of the present invention, Figure 9 is a schematic diagram of another display device provided by an embodiment of the present invention, Figure 10 is a partial schematic diagram of a touch electrode provided by an embodiment of the present invention, Figure 11 FIG. 1 is a partial schematic diagram of a touch electrode block provided by an embodiment of the present invention. Figures 8 to 11The optional display device shown includes a touch structure 109, which is located between the display functional layer 102 and the cover glass 103. The touch structure 109 includes a first metal layer 110 and a second metal layer 111, which are spaced apart. The first metal layer 110 includes a plurality of touch electrodes 112. The touch electrodes 112 include a plurality of touch electrode blocks 113 arranged along the electrode extension direction. Adjacent touch electrode blocks 113 are electrically connected via a plurality of first vias 114 and at least one first bridge 115. The first bridge 115 is located in the second metal layer 111. The second metal layer 111 is optionally located between the display functional layer 102 and the first metal layer 110. In other embodiments, the second metal layer may be located on the side of the first metal layer facing away from the display functional layer. The optional electroluminescent layer 104 is located between the first metal layer 110 and the second metal layer 111. The electroluminescent layer 104 is insulated from the first metal layer 110 and the second metal layer 111. The electroluminescent layer 104 includes a plurality of first openings 104a. The vertical projection of the first opening 104a on the first metal layer 110 surrounds at least one first via 114.

[0070] In this embodiment, the touch structure 109 is located between the display function layer 102 and the cover glass 103. Designing the touch structure 109 within the display device helps reduce the overall thickness of the display device, meeting the demand for thinner and lighter displays. It also simplifies the production process, reduces costs, and improves production efficiency. At least a portion of the touch electrodes 112 is located in the display area AA, so that the display area AA has touch functionality.

[0071] The first metal layer 110 includes a plurality of touch electrodes 112. The plurality of touch electrodes 112 include a plurality of first touch electrodes 112a extending along a first direction F1 and arranged along a second direction F2. The plurality of touch electrodes 112 also include a plurality of second touch electrodes 112b extending along a direction F2 and arranged along the direction F1. The directions F1 and F2 intersect, and the first touch electrodes 112a and the second touch electrodes 112b are insulated from each other. Figure 10 Only a local area where a first touch electrode 112 a and a second touch electrode 112 b intersect is shown.

[0072] The touch electrodes 112 include multiple touch electrode blocks 113 arranged along the electrode extension direction. Specifically, the first touch electrode 112a includes multiple first touch electrode blocks 113a arranged along the F1 direction. Adjacent first touch electrode blocks 113a in the first touch electrodes 112a are electrically connected via a first bridge 115. The via hole connecting the first touch electrode block 113a to the first bridge 115 is a first via 114. The first bridge 115 is located in the second metal layer 111. Specifically, the second touch electrode 112b includes multiple second touch electrode blocks 113b arranged along the F2 direction. Adjacent second touch electrode blocks 113b in the second touch electrodes 112b are electrically connected via a first connecting portion 113c located in the first metal layer 110.

[0073] The touch electrode block 113 is a metal mesh structure that includes a plurality of metal meshes 113d. It will be understood that the sub-pixel 106 includes a light-emitting area 106a and a non-light-emitting area surrounding the light-emitting area 106a. The touch structure 109 is located between the display function layer 102 and the cover glass 103. Therefore, the vertical projection of the metal mesh structure on the display function layer 102 is located in the non-light-emitting area of the sub-pixel 106. In other words, the vertical projection of the metal wires constituting the metal mesh 113d on the display function layer 102 is located in the non-light-emitting area of the sub-pixel 106. The vertical projection of the metal mesh 113d on the display function layer 102 surrounds the light-emitting area 106a of at least one sub-pixel 106. Figure 11 A metal mesh 113d may be selected to surround the light-emitting area 106a of a sub-pixel 106 in its vertical projection on the display function layer 102. This ensures that the touch electrode 112 does not block the light-emitting area 106a of the sub-pixel 106, and the touch structure 109 meets the touch requirements without affecting the display effect of the display area AA. Figures 8 to 11 The touch structure 109 shown is only an example, and the touch structure in the present invention is not limited thereto.

[0074] The electro-optical layer 104 is disposed between the first metal layer 110 and the second metal layer 111. The electro-optical layer 104 is conductive, so the electro-optical layer 104 is insulated from the first metal layer 110 and the second metal layer 111. Accordingly, the electro-optical layer 104 is insulated from the first via 114. Based on this, the electro-optical layer 104 is designed to have a plurality of first openings 104a, such that the vertical projection of the first openings 104a on the first metal layer 110 surrounds at least one first via 114. Figure 8 As shown, the vertical projection of the optional first opening 104a on the first metal layer 110 surrounds a first via 114. Figure 9 As shown, the vertical projection of the optional first opening 104 a on the first metal layer 110 surrounds the plurality of first vias 114 .

[0075] Figure 12 is a schematic diagram of another display device provided by an embodiment of the present invention, and Figure 8 and Figure 9 The difference is that the optional touch structure 109 includes a first dielectric layer 116; the second metal layer 111 and the electroluminescent layer 104 are formed together on the side of the first dielectric layer 116 facing away from the substrate 101; the electroluminescent layer 104 includes a plurality of second openings 104b, and the second openings 104b surround at least one first bridge 115. The first dielectric layer 116 is an insulating dielectric layer.

[0076] Specifically, the electro-dimming layer 104 is conductive, so the electro-dimming layer 104 and the second metal layer 111, located on the same layer as the first dielectric layer 116, are insulated from each other. The second metal layer 111 includes multiple first bridges 115, and accordingly, the electro-dimming layer 104 and the first bridges 115 are insulated from each other. Based on this, the electro-dimming layer 104 is designed to have multiple second openings 104b, such that the second openings 104b surround at least one first bridge 115. It is understood that if the second metal layer 111 includes other metal portions, the electro-dimming layer 104 also includes multiple openings to provide insulation between the electro-dimming layer 104 and any metal portion in the second metal layer 111.

[0077] In this embodiment, the electroluminescent layer 104 is provided within the touch structure 109, thereby reducing the overall thickness of the display device, meeting the demand for thinner and lighter displays. This also simplifies the production process, reduces costs, and improves production efficiency. The addition of the electroluminescent layer 104 optimizes the display device's display quality for low-grayscale images.

[0078] Figure 13 is a schematic diagram of another display device provided by an embodiment of the present invention, Figure 14 is a schematic diagram of another display device provided by an embodiment of the present invention, such as Figure 7 and Figures 13 and 14 The optional display device shown includes an encapsulation structure 108, which is located between the display functional layer 102 and the cover glass 103. The electroluminescent layer 104 is located on the side of the encapsulation structure 108 facing the display functional layer 102, or on the side of the encapsulation structure 108 facing away from the display functional layer 102. In this embodiment, the electroluminescent layer 104 can be located on the side of the encapsulation structure 108 facing the display functional layer 102 or on the side of the encapsulation structure 108 facing away from the display functional layer 102. The electroluminescent layer 104 is insulated from the other functional film layers.

[0079] Figure 15 is a schematic diagram of another display device provided by an embodiment of the present invention, Figure 16is a schematic diagram of another display device provided by an embodiment of the present invention, such as Figure 15 and Figure 16 The optional display device shown includes an encapsulation structure 108, which is located between the display function layer 102 and the cover glass 103. The encapsulation structure 108 includes at least one encapsulation layer, at least one of which includes an electroluminescent layer 104. The encapsulation structure 108 may include inorganic encapsulation layers and organic encapsulation layers that are stacked and alternately distributed. The inorganic encapsulation layer can be formed by a chemical vapor deposition process and can be made of some hard materials such as silicon nitride or silicon oxide. The organic encapsulation layer can be formed by inkjet printing to form a stacked structure with the inorganic encapsulation layer to ensure the overall encapsulation effect of the encapsulation structure 108.

[0080] like Figure 15 As shown, the optional electroluminescent layer 104 is located between two adjacent encapsulation layers in the encapsulation structure 108. The optional encapsulation structure 108 includes at least a first encapsulation layer 108a, a second encapsulation layer 108b, and a third encapsulation layer 108c. The electroluminescent layer 104 can be located between the second encapsulation layer 108b and the third encapsulation layer 108c. Here, the optional first encapsulation layer 108a, the second encapsulation layer 108b, and the third encapsulation layer 108c are inorganic encapsulation layers and organic encapsulation layers that are stacked and alternately distributed. The additional electroluminescent layer 104 can be an inorganic encapsulation layer or an organic encapsulation layer. Exemplarily, the first encapsulation layer 108a is an inorganic encapsulation layer, the second encapsulation layer 108b is an organic encapsulation layer, and the third encapsulation layer 108c is an inorganic encapsulation layer.

[0081] like Figure 16 As shown, the optional electro-optical dimming layer 104 is multiplexed into a packaging layer in the packaging structure 108. The optional packaging structure 108 includes at least a first packaging layer 108a, a second packaging layer 108b and a third packaging layer 108c, and at least one of the first packaging layer 108a, the second packaging layer 108b and the third packaging layer 108c is multiplexed into the electro-optical dimming layer 104. Figure 16 As shown, the optional second encapsulation layer 108b can be reused as the electro-dimming layer 104. Here, the first encapsulation layer 108a, the second encapsulation layer 108b, and the third encapsulation layer 108c are inorganic encapsulation layers and organic encapsulation layers that are stacked and alternately distributed. For example, the first encapsulation layer 108a is an inorganic encapsulation layer, the second encapsulation layer 108b is an organic encapsulation layer, and the third encapsulation layer 108c is an inorganic encapsulation layer. When forming the second encapsulation layer 108b, an organic electro-dimming material is used to form the organic electro-dimming layer 104. Then, the organic electro-dimming layer 104 is not only electrically connected to the dimming circuit to realize the electro-dimming function, but also serves as the organic encapsulation layer of the encapsulation structure 108.

[0082] In other embodiments, the inorganic electroluminescent layer formed of the inorganic electroluminescent material is not only electrically connected to the dimming circuit to realize the electroluminescent function, but also serves as an inorganic encapsulation layer of the encapsulation structure.

[0083] It can be understood that the display device includes at least one inorganic dielectric layer and at least one organic dielectric layer. On the premise of being insulated from other functional film layers, the organic electroluminescent layer formed by organic electroluminescent materials can be reused as the organic dielectric layer in the display device, or the inorganic electroluminescent layer formed by inorganic electroluminescent materials can be reused as the inorganic dielectric layer in the display device. The electroluminescent layer is reused as a dielectric layer in the display device, that is, an original dielectric layer in the display device is replaced with a dielectric layer with electroluminescent function, and the thickness of the display device can be increased. There is no specific limitation in the present invention. For example, the touch structure includes multiple dielectric layers. On the premise of being insulated from other functional film layers to ensure the normal operation of the display device, the organic electroluminescent layer can be reused as an organic dielectric layer in the touch structure, or the inorganic electroluminescent layer can be reused as an inorganic dielectric layer in the touch structure.

[0084] In this embodiment, an electroluminescent layer 104 is added to the display device. The electroluminescent layer 104 is disposed on the side of the display functional layer 102 that faces away from the base substrate 101. In the dimming display mode, the transmittance of the electroluminescent layer 104 is less than a second transmittance threshold. Light emitted by the display functional layer 102 is emitted through the low-transmittance electroluminescent layer 104. This can reduce display differences between different sub-pixels 106 in the display device, optimize the display effect of the display device on low grayscale images, and enhance the user experience.

[0085] Based on the same inventive concept, an embodiment of the present invention further provides a display device, Figure 17 is a schematic diagram of another display device provided by an embodiment of the present invention, such as Figure 17 As shown, the display device 100 includes the electroluminescent layer 104 and the dimming circuit 105 described in any embodiment of the present invention. Therefore, the display device 100 provided by the embodiment of the present invention has the technical effects of the technical solutions in any of the above embodiments, and the structures that are the same as or corresponding to the above embodiments and the explanation of terms are not repeated here.

[0086] In the present invention, the display device 100 may be Figure 5 The mobile phone shown can also be Figure 17 The vehicle-mounted display shown can also be any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablets, digital cameras, smart bracelets, smart glasses, aircraft, construction equipment, medical equipment, industrial control equipment, touch interactive terminals, etc. The embodiments of the present invention do not specifically limit this.

[0087] In the present invention, an electro-dimming layer 104 and a dimming circuit 105 are added to the display device 100. The dimming circuit 105 provides an electric drive signal to the electro-dimming layer 104 to flexibly adjust the transmittance of the electro-dimming layer 104. In the conventional display mode, it is a high-transmittance layer. In the low-brightness display mode, the voltage of the electro-dimming layer 104 is changed to reduce the transmittance of the film layer. In this way, the display effect of the display device 100 (especially the OLED display device) on the low grayscale screen can be improved, and the actual display brightness of the pixel can be increased accordingly, the display effect can be optimized, and the display anomalies caused by undesirable phenomena such as smearing color deviation and uneven display can be improved, thereby improving the user experience. It can be understood that the current dimming display mode can be selected as a low-brightness display mode (i.e., a low-grayscale display screen), but in subsequent applications it can also be applied to other scenes that require dimming, not limited to low grayscale screens.

[0088] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0089] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A display device, characterized in that: include: A base substrate, a display function layer, an electroluminescent layer, and a cover glass, wherein the display function layer is located between the base substrate and the cover glass, and the electroluminescent layer is located on a side of the display function layer away from the base substrate; a dimming circuit, the dimming circuit being electrically connected to the electroluminescent dimming layer; The operating modes of the display device include a first display mode and a dimming display mode; In the first display mode, the transmittance of the electroluminescent layer is greater than or equal to a first transmittance threshold; In the dimming display mode, the dimming circuit is used to provide a first electrical driving signal to the electroluminescent layer, so that the transmittance of the electroluminescent layer is less than a second transmittance threshold, and the second transmittance threshold is less than or equal to the first transmittance threshold.

2. The display device according to claim 1, wherein The dimming display mode is a low-brightness display mode.

3. The display device according to claim 1, wherein The material of the electroluminescent layer includes an inorganic metal compound or an organic metal compound.

4. The display device according to claim 1, wherein The material of the electroluminescent layer includes at least one of indium tin oxide, tungsten trioxide, vanadium dioxide, nickel oxide, organic metal and liquid electrolyte.

5. The display device according to claim 1, wherein The electroluminescent layer is located between the display function layer and the cover glass.

6. The display device according to claim 5, wherein: The material of the electroluminescent layer includes an inorganic metal compound.

7. The display device according to claim 1, wherein The electroluminescent layer is located on a side of the cover glass facing away from the base substrate.

8. The display device according to claim 1, wherein The cover glass includes at least one protective layer, and the at least one protective layer includes the electroluminescent layer.

9. The display device according to claim 1, wherein The display device includes a touch structure, and the touch structure is located between the display function layer and the cover glass; The touch structure includes a first metal layer and a second metal layer that are spaced apart, and the first metal layer includes a plurality of touch electrodes; The touch electrode includes a plurality of touch electrode blocks arranged along an electrode extension direction, and two adjacent touch electrode blocks are electrically connected via a plurality of first via holes and at least one first bridge; The first bridge is located in the second metal layer.

10. The display device according to claim 9, wherein The electroluminescent layer is located between the first metal layer and the second metal layer, and the electroluminescent layer is insulated from the first metal layer and the second metal layer; The electroluminescent layer includes a plurality of first openings, and vertical projections of the first openings on the first metal layer surround at least one first via hole.

11. The display device according to claim 9, wherein The touch structure includes a first dielectric layer; The second metal layer and the electroluminescent dimming layer are formed together on a side of the first dielectric layer away from the base substrate; The electroluminescent layer includes a plurality of second openings, and the second openings surround at least one of the first bridges.

12. The display device according to claim 9, wherein The second metal layer is located on a side of the first metal layer away from the display function layer; Alternatively, the second metal layer is located between the display function layer and the first metal layer.

13. The display device according to claim 1, wherein The display device includes a packaging structure, wherein the packaging structure is located between the display function layer and the cover glass; The electroluminescent layer is located on a side of the packaging structure facing the display function layer, or the electroluminescent layer is located on a side of the packaging structure facing away from the display function layer.

14. The display device according to claim 1, wherein The display device includes a packaging structure, wherein the packaging structure is located between the display function layer and the cover glass; The encapsulation structure includes at least one encapsulation layer, and the at least one encapsulation layer includes the electroluminescent layer.

15. The display device according to claim 1, wherein In the first display mode, the dimming circuit is disconnected from the electroluminescent layer.

16. The display device according to claim 1, wherein The electro-optical dimming layer is a first type electro-optical dimming layer, and the first electrical driving signal is less than 0V; Alternatively, the electro-luminescent layer is a second type electro-luminescent layer, and the first electrical driving signal is greater than 0V.

17. The display device according to claim 1, wherein In the first display mode, the dimming circuit provides a second electrical driving signal to the electroluminescent layer.

18. The display device according to claim 17, wherein: The electro-optical dimming layer is a first type electro-optical dimming layer, and the first electrical driving signal is smaller than the second electrical driving signal; Alternatively, the electro-luminescent layer is a second-type electro-luminescent layer, and the first electrical driving signal is greater than the second electrical driving signal.

19. The display device according to claim 17, wherein: The second electric driving signal is 0V.

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