A double-sided display panel and a double-sided display device

Abstract

This application discloses a double-sided display panel and a double-sided display device, relating to the field of display technology. It can balance the display performance of the front and back displays of the double-sided display panel, balance the brightness of the double-sided displays, reduce the brightness difference between the two sides, and avoid affecting the user's eye health. The double-sided display panel includes: a substrate layer; front display pixels; and back display pixels. The front display pixels and the back display pixels are both disposed on the same side of the substrate layer, and the light-emitting sides of the front display pixels and the back display pixels are opposite to each other. The front light-emitting brightness ratio is equal to the back light-emitting brightness ratio. The front light-emitting brightness ratio is the product of the aperture ratio of the front display pixels, the luminous efficiency of the front pixels, and the brightness loss rate of the front display pixels. The back light-emitting brightness ratio is the product of the aperture ratio of the back display pixels, the luminous efficiency of the back pixels, and the brightness loss rate of the back display pixels.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a double-sided display panel and a double-sided display device. Background Technology

[0002] Currently, with the development of double-sided display technology, the performance of double-sided displays is gradually improving. With the development of foldable and rollable screens, double-sided displays have become a hot research topic. Currently, they are usually achieved by bonding two display screens together, which significantly increases the cost, thickness, and weight of the display device. Achieving double-sided display on the same display panel has become an important research direction for double-sided display technology.

[0003] However, the brightness of the front and back displays of existing double-sided display panels differs significantly, resulting in a large difference in display effects. This can cause eye discomfort for users and affect their eye health. Summary of the Invention

[0004] This application provides a dual-sided display panel and a dual-sided display device, which can balance the display performance of the front and back displays of the dual-sided display panel, balance the brightness of the dual displays, reduce the brightness difference between the two displays, and avoid affecting the user's eye health.

[0005] A first aspect of this application provides a double-sided display panel, comprising:

[0006] Substrate layer;

[0007] Front-facing display pixels;

[0008] The back display pixels are disposed on the same side of the substrate layer, and the light-emitting sides of the front display pixels and the back display pixels are opposite to each other.

[0009] The front luminance ratio is equal to the back luminance ratio. The front luminance ratio is the product of the aperture ratio of the front display pixel and the luminous efficiency of the front pixel and the luminance loss rate of the front display. The back luminance ratio is the product of the aperture ratio of the back display pixel and the luminous efficiency of the back pixel and the luminance loss rate of the back display.

[0010] In some embodiments, the front display pixel includes at least two types of front light-emitting devices, and different types of front light-emitting devices emit light of different colors;

[0011] The rear display pixels include at least one rear-emitting device, and different types of rear-emitting devices emit light of different colors.

[0012] In some embodiments, when the front display pixel includes at least two of the front light-emitting devices, the front light emission brightness ratio is the sum of the product of the aperture ratio and luminous efficiency of each of the front light-emitting devices, and then the product of the front display brightness loss rate.

[0013] When the rear display pixel includes at least two of the rear light-emitting devices, the rear light emission brightness ratio is the sum of the products of the aperture ratio and luminous efficiency of each of the rear light-emitting devices, and then the product of the rear display brightness loss rate.

[0014] In some embodiments, the front display pixels include red front light-emitting devices, green front light-emitting devices, and blue front light-emitting devices;

[0015] The rear display pixels include red rear light-emitting devices and / or green rear light-emitting devices and / or blue rear light-emitting devices.

[0016] In some embodiments, the aperture ratio of the red front-facing light-emitting device is smaller than that of the green front-facing light-emitting device, and the aperture ratio of the green front-facing light-emitting device is smaller than that of the blue front-facing light-emitting device.

[0017] When the rear display pixel includes the red rear light-emitting device, the green rear light-emitting device, and the blue rear light-emitting device, the aperture ratio of the red rear light-emitting device is greater than that of the green rear light-emitting device, and the aperture ratio of the red rear light-emitting device is less than that of the blue rear light-emitting device;

[0018] When the rear display pixel includes the red rear light-emitting device, the aperture ratio of the red rear light-emitting device is a first aperture ratio; when the rear display pixel includes the green rear light-emitting device, the aperture ratio of the green rear light-emitting device is a second aperture ratio; when the rear display pixel includes the blue rear light-emitting device, the aperture ratio of the blue rear light-emitting device is a third aperture ratio; the first aperture ratio is greater than the second aperture ratio, and the first aperture ratio is less than the third aperture ratio.

[0019] In some embodiments, the aperture ratio of any type of front-facing light-emitting device is calculated based on the aperture ratio of other types of front-facing light-emitting devices and the aperture ratio of the back-facing light-emitting device;

[0020] When the rear display pixel includes at least two types of rear-emitting devices, the aperture ratio of any type of rear-emitting device is calculated based on the aperture ratio of other types of rear-emitting devices and the aperture ratio of the front-emitting device.

[0021] In some embodiments, the front display pixels are divided into multiple front pixel units, and each front pixel unit includes at least two types of front light-emitting devices;

[0022] The rear display pixels are divided into multiple rear pixel units, and each rear pixel unit includes at least one of the rear light-emitting devices;

[0023] The ratio of the number of front pixel units to the number of back pixel units is 1:2, 2:1, or 1:1.

[0024] In some embodiments, the front pixel units and the back pixel units are arranged alternately.

[0025] In some embodiments, the orthographic projection of the front-facing light-emitting device on the substrate layer does not overlap with the orthographic projection of the back-facing light-emitting device on the substrate layer.

[0026] In some embodiments, the thickness of the anode of the back-side light-emitting device is less than the thickness of the anode of the front-side light-emitting device, wherein the anode of the light-emitting device is disposed between the substrate layer and the light-emitting layer.

[0027] In some embodiments, the anode of the light-emitting device includes a first transparent conductive layer, a second transparent conductive layer, and a metal layer, wherein the metal layer is disposed between the first transparent conductive layer and the second transparent conductive layer;

[0028] The metal layer thickness of the anode of the rear-facing light-emitting device is less than the metal layer thickness of the anode of the front-facing light-emitting device.

[0029] In some embodiments, the thickness of the cathode of the back-side light-emitting device is greater than the thickness of the cathode of the front-side light-emitting device, wherein the cathode of the light-emitting device is disposed on the side of the light-emitting layer away from the substrate layer.

[0030] In some embodiments, the cathode of the rear-facing light-emitting device and the cathode of the front-facing light-emitting device are driven independently.

[0031] In some embodiments, the orthographic projection of the anode of the back-emitting device onto the substrate layer does not overlap with the orthographic projection of the anode of the front-emitting device onto the substrate layer; and / or,

[0032] The orthographic projection of the cathode of the rear-facing light-emitting device onto the substrate layer does not overlap with the orthographic projection of the cathode of the front-facing light-emitting device onto the substrate layer; and / or,

[0033] The anode of the rear-side light-emitting device is disposed in the same layer as the anode of the front-side light-emitting device; and / or,

[0034] The cathode of the rear-side light-emitting device is disposed in the same layer as the cathode of the front-side light-emitting device.

[0035] A second aspect of this application provides a dual-sided display device, comprising:

[0036] As described in the first aspect, a double-sided display panel.

[0037] The double-sided display panel provided in this application embodiment has front and back display pixels disposed on the same side of the substrate layer, with the light-emitting sides of the front and back display pixels facing away from each other, enabling double-sided display on the same panel. By setting the front and back light emission brightness ratios to be equal, other aperture ratios can be calculated based on this equal ratio and a determined aperture ratio and brightness loss. Setting the front and back light emission brightness ratios to be equal allows for adjustment of the front and back display brightness through aperture ratio settings, reducing the difference between the two brightness levels, improving user comfort when using the double-sided display panel, and avoiding impact on the user's eye health. Attached Figure Description

[0038] Figure 1 A schematic structural diagram of a double-sided display panel provided in an embodiment of this application;

[0039] Figure 2 A schematic pixel structure diagram of a double-sided display panel provided for an embodiment of this application;

[0040] Figure 3 A schematic pixel structure diagram of another double-sided display panel provided in an embodiment of this application;

[0041] Figure 4 A schematic pixel structure diagram of yet another double-sided display panel provided in an embodiment of this application;

[0042] Figure 5 A schematic pixel structure diagram of another double-sided display panel provided in an embodiment of this application;

[0043] Figure 6 A schematic pixel structure diagram of a double-sided display panel provided for an embodiment of this application;

[0044] Figure 7 A schematic pixel structure diagram of another double-sided display panel provided in an embodiment of this application;

[0045] Figure 8 A schematic pixel structure diagram of another double-sided display panel provided in an embodiment of this application;

[0046] Figure 9A schematic pixel structure diagram of yet another double-sided display panel provided in an embodiment of this application;

[0047] Figure 10 A schematic pixel structure diagram of another double-sided display panel provided in an embodiment of this application;

[0048] Figure 11 A schematic pixel structure diagram of a double-sided display panel provided for an embodiment of this application;

[0049] Figure 12 A schematic pixel structure diagram of another double-sided display panel provided in an embodiment of this application;

[0050] Figure 13 A schematic partial structural diagram of a double-sided display panel provided for an embodiment of this application;

[0051] Figure 14 This is a schematic structural diagram of a double-sided display device provided in an embodiment of this application. Detailed Implementation

[0052] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0053] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0054] Currently, with the development of double-sided display technology, the performance of double-sided displays is gradually improving. With the development of foldable and rollable screens, double-sided displays have become a hot research topic. Currently, they are usually achieved by bonding two display screens together, which significantly increases the cost, thickness, and weight of the display device. Achieving double-sided display on the same display panel has become an important research direction for double-sided display technology. However, existing double-sided display panels have a significant difference in brightness between the front and back displays, resulting in a large difference in display effects that can cause eye discomfort and affect users' eye health.

[0055] In view of this, embodiments of this application provide a dual-sided display panel and a dual-sided display device, which can balance the display performance of the front and back displays of the dual-sided display panel, balance the brightness of the dual displays, reduce the brightness difference between the two displays, and avoid affecting the user's eye health.

[0056] A first aspect of this application provides a double-sided display panel. Figure 1 This is a schematic structural diagram of a double-sided display panel provided in an embodiment of this application. Figure 1 As shown in the embodiment of this application, the double-sided display panel includes: a substrate layer 100, front display pixels 200, and rear display pixels 300. The front display pixels 200 and the rear display pixels 300 are both disposed on the same side of the substrate layer 100. The light-emitting sides of the front display pixels 200 and the rear display pixels 300 are opposite to each other. The first light-emitting side D1 of the front display pixels 200 can be considered as the front display light-emitting side, and the second light-emitting side D2 of the rear display pixels 300 can be considered as the rear display light-emitting side. The front luminous brightness ratio is equal to the rear luminous brightness ratio. The front luminous brightness ratio is the product of the aperture ratio of the front display pixels 200 and the luminous efficiency and luminous loss rate of the front pixels, respectively. The rear luminous brightness ratio is the product of the aperture ratio of the rear display pixels 300 and the luminous efficiency and luminous loss rate of the rear pixels, respectively. By setting the front luminous brightness ratio to be equal to the rear luminous brightness ratio, other aperture ratios can be calculated based on the determined aperture ratio and luminous loss, according to the relationship of equal luminous brightness ratios. Setting the front and rear light emission ratios to be equal allows for adjustment of the brightness of both the front and rear displays by adjusting the aperture ratio. This reduces the difference in brightness between the front and rear displays, improving user comfort when using the dual-sided display panel and preventing eye strain.

[0057] It should be noted that the brightness difference between the front and back displays on a typical double-sided display panel is about 30%. When the brightness of the front display is 30% or more greater than that of the back display, the user's eyes will be stimulated by the brightness difference when switching from viewing the front display to viewing only the back display, which can cause physiological discomfort. Long-term use can easily affect the user's eye health.

[0058] To address the aforementioned issues, the dual-sided display panel provided in this application embodiment has both the front display pixels 200 and the back display pixels 300 disposed on the same side of the substrate layer 100. The light-emitting sides of the front display pixels 200 and the back display pixels 300 are opposite to each other, enabling dual-sided display on the same display panel. By setting the front luminance ratio to be equal to the back luminance ratio, other aperture ratios can be calculated based on the equal luminance ratio and the determined aperture ratio and brightness loss. Setting the front luminance ratio to be equal to the back luminance ratio allows for adjustment of the front and back display brightness through aperture ratio settings, reducing the difference between the front and back display brightness, improving user comfort when using the dual-sided display panel, and avoiding impact on the user's eye health.

[0059] In some embodiments, the front display pixel 200 includes at least two types of front light-emitting devices, with different types of front light-emitting devices emitting different colors of light; the rear display pixel 300 includes at least one type of rear light-emitting device, with different types of rear light-emitting devices emitting different colors of light.

[0060] For example, Figure 2 This is a schematic pixel structure diagram of a double-sided display panel provided in an embodiment of this application. Figure 2 As shown, the front display pixel 200 includes a red front light-emitting device R1, a green front light-emitting device G1, and a blue front light-emitting device B1, while the rear display pixel includes a red back light-emitting device R2, a green back light-emitting device G2, and a blue back light-emitting device B2. For example, the front display pixel 200 includes a front pixel unit 201, and the rear display pixel 300 includes a rear pixel unit 301. Each front pixel unit 201 includes a red front light-emitting device R1, a green front light-emitting device G1, and a blue front light-emitting device B1, and each rear pixel unit 301 includes a red back light-emitting device R2, a green back light-emitting device G2, and a blue back light-emitting device B2. Figure 1 The number of front pixel units 201 and back pixel units 301 shown is the same, that is, the ratio of the number of front pixel units 201 to back pixel units 301 is 1:1.

[0061] For example, Figure 3This is a schematic pixel structure diagram of another double-sided display panel provided in an embodiment of this application. (See diagram below.) Figure 3 As shown, the number of front pixel units 201 is less than the number of back pixel units 301, that is, the ratio of the number of front pixel units 201 to the number of back pixel units 301 is 1:2.

[0062] It should be noted that the ratio of the number of front pixel units 201 to the number of back pixel units 301 can also be 2:1, which can be set according to the specific color range. This application embodiment does not make specific limitations.

[0063] For example, Figure 4 This is a schematic pixel structure diagram of yet another double-sided display panel provided in an embodiment of this application. For example... Figure 4 As shown, the ratio of the number of front pixel units 201 to the number of back pixel units 301 is 1:2. Figure 3 and Figure 4 The arrangement of the rear pixel units 301 shown is different. The arrangement of the front pixel units 201 and the rear pixel units 301 can be determined by simulation based on the specifications of the actual display screen, and this application embodiment does not impose specific limitations.

[0064] For example, Figure 5 This is a schematic pixel structure diagram of another double-sided display panel provided in an embodiment of this application. For example... Figure 5 As shown, the back pixel unit 301 includes a red back light-emitting device R2 and a green back light-emitting device G2.

[0065] For example, Figure 6 This is a schematic pixel structure diagram of a double-sided display panel provided in an embodiment of this application. Figure 6 As shown, the back pixel unit 301 includes a red back light-emitting device R2 and a blue back light-emitting device B2.

[0066] For example, Figure 7 This is a schematic pixel structure diagram of another double-sided display panel provided in an embodiment of this application. (See diagram below.) Figure 7 As shown, the back pixel unit 301 includes a green back light-emitting device G2 and a blue back light-emitting device B2.

[0067] For example, Figure 8 This is a schematic pixel structure diagram of another double-sided display panel provided in an embodiment of this application. (See diagram below.) Figure 8As shown, the rear display pixel 300 includes a first pixel unit 302 and a second pixel unit 303. The first pixel unit 302 includes a red rear light-emitting device R2, a green rear light-emitting device G2 and a blue rear light-emitting device B2. The second pixel unit 303 includes a green rear light-emitting device G2 and a red rear light-emitting device R2.

[0068] For example, refer to Figure 5 The rear pixel unit 301 includes a red rear-emitting device R2 and a green rear-emitting device G2. (Reference) Figure 8 The first pixel unit 302 includes a red back-emitting device R2, a green back-emitting device G2, and a blue back-emitting device B2. The red-green pixel design will emit yellow-green wavelength light, which will be more sensitive to people and appear brighter.

[0069] It should be noted that, Figures 2-7 The pixel structure of the double-sided display panel shown allows for full-color display on the front side. Figures 2-4 The pixel structure of the double-sided display panel shown allows for full-color display on the back.

[0070] In some implementations, reference Figures 2-12 The front pixel unit 201 and the back pixel unit 301 are arranged alternately. The orthographic projection of the front light-emitting device on the substrate layer does not overlap with the orthographic projection of the back light-emitting device on the substrate layer. The front light-emitting device and the back light-emitting device can be obtained through the same process, that is, they can be manufactured simultaneously. The back light-emitting device does not need to be manufactured separately, which will not increase the production time of the display panel or cause a significant increase in production costs.

[0071] For example, Figure 9 This is a schematic pixel structure diagram of yet another double-sided display panel provided in an embodiment of this application. For example... Figure 9 As shown, the rear pixel unit 301 includes only one blue rear light-emitting device B2, so the rear display screen can be a blue monochrome display.

[0072] For example, Figure 10 This is a schematic pixel structure diagram of another double-sided display panel provided in an embodiment of this application. For example... Figure 10 As shown, the rear pixel unit 301 includes only one green rear light-emitting device G2, so the rear display screen can be a green monochrome display.

[0073] For example, Figure 11 This is a schematic pixel structure diagram of a double-sided display panel provided in an embodiment of this application. Figure 11As shown, the rear pixel unit 301 includes only one red rear light-emitting device R2, so the rear display image can be a red monochrome display.

[0074] For example, Figure 12 This is a schematic pixel structure diagram of another double-sided display panel provided in an embodiment of this application. (See diagram below.) Figure 12 As shown, the rear pixel unit 301 includes only one green rear light-emitting device G2, one red rear light-emitting device R2 and one blue rear light-emitting device B2, so the rear display screen can be a color display screen. Figure 12 The ratio of the number of front pixel units 201 to the number of back pixel units 301 shown is 3:1, which is only illustrative and not intended as a specific limitation of the embodiments of this application.

[0075] In some embodiments, when the front display pixel 200 includes at least two types of front light-emitting devices, the front light emission brightness ratio is the product of the sum of the aperture ratios of each front light-emitting device and the front display brightness loss rate. For example, refer to... Figure 2 The front luminous brightness ratio = (aperture ratio of R1 × luminous efficiency of R1 + aperture ratio of G1 × luminous efficiency of G1 + aperture ratio of B1 × luminous efficiency of B1) × front display brightness loss rate.

[0076] In some implementations, when the rear-facing display pixels include at least two types of rear-facing light-emitting devices, the rear-facing light emission ratio is the product of the sum of the aperture ratios of each rear-facing light-emitting device and the rear-facing display brightness loss rate. For example, refer to... Figure 2 The back-emitting brightness ratio = (aperture ratio of R2 × luminous efficiency of R2 + aperture ratio of G2 × luminous efficiency of G2 + aperture ratio of B2 × luminous efficiency of B2) × back-emitting display brightness loss rate. (Reference) Figure 5 The back-emitting brightness ratio = (aperture ratio of R2 × luminous efficiency of R2 + aperture ratio of G2 × luminous efficiency of G2) × back-emitting display brightness loss rate. (Reference) Figure 9 The back-emitting brightness ratio = aperture ratio of B2 × luminous efficiency of B2 × back-emitting display brightness loss rate. (Reference) Figure 10 The back-emitting brightness ratio = aperture ratio of G2 × luminous efficiency of G2 × back-emitting display brightness loss rate. (Reference) Figure 11 The back-emitting brightness ratio = aperture ratio of R2 × luminous efficiency of R2 × back-display brightness loss rate.

[0077] In some embodiments, the aperture ratio of the red front light-emitting device R1 is less than that of the green front light-emitting device G1, and the aperture ratio of the green front light-emitting device G1 is less than that of the blue front light-emitting device B1; when the rear display pixels include a red back light-emitting device R2, a green back light-emitting device G2, and a blue back light-emitting device B2, the aperture ratio of the red back light-emitting device R2 is greater than that of the green back light-emitting device G2, and the aperture ratio of the red back light-emitting device R2 is less than that of the blue back light-emitting device B2.

[0078] For example, refer to Figure 2 At 110 PPI (resolution), the aperture ratio of R1 is 5.68%, the aperture ratio of G1 is 6.84%, and the aperture ratio of B1 is 13.68%. The aperture ratio of R2 is 5.68%, the aperture ratio of G2 is 4.59%, and the aperture ratio of B2 is 13.68%.

[0079] In some embodiments, when the rear display pixel 300 includes a red rear light-emitting device R2, the aperture ratio of the red rear light-emitting device R2 is a first aperture ratio; when the rear display pixel 300 includes a green rear light-emitting device G2, the aperture ratio of the green rear light-emitting device G2 is a second aperture ratio; when the rear display pixel 300 includes a blue rear light-emitting device B2, the aperture ratio of the blue rear light-emitting device B2 is a third aperture ratio; the first aperture ratio is greater than the second aperture ratio, and the first aperture ratio is less than the third aperture ratio.

[0080] For example, under a PPI of 110, such as Figure 9 As shown, the third aperture ratio (the aperture ratio of B2) is 40%; Figure 10 As shown, the second aperture ratio (the aperture ratio of G2) is 16.23%; Figure 11 As shown, the first aperture ratio (the aperture ratio of R2) is 34.55%.

[0081] In some implementations, the aperture ratio of any type of front-emitting device is calculated based on the aperture ratio of other types of front-emitting devices and the aperture ratio of the rear-emitting device; when the rear display pixel includes at least two types of rear-emitting devices, the aperture ratio of any type of rear-emitting device is calculated based on the aperture ratio of other types of rear-emitting devices and the aperture ratio of the front-emitting device.

[0082] It should be noted that the display brightness loss rate is the measured brightness loss rate of the light-emitting device, which differs from the theoretical value.

[0083] For example, taking 100 PPI as an example, Table 1 shows the brightness-related data for the pixels displayed on the front side. Correspondingly, the brightness loss rate for the front display is 94%, and the brightness loss rate for the rear display is 60%.

[0084] Luminous efficiency 60 120 6 Slot ratio 5.68％ 6.84％ 13.68％

[0085] Table 1

[0086] For example, with a PPI of 100, the front luminous intensity ratio = the back luminous intensity ratio = 11.69.

[0087] Example 1, Reference Figure 11 The aperture ratio of R1 is 5.68%, the aperture ratio of G1 is 6.84%, and the aperture ratio of B1 is 13.68%. The front luminous intensity ratio = (60 × 5.68% + 120 × 6.84% + 6 × 13.68%) × 94% = the back luminous intensity ratio = (60 × aperture ratio of R2) × 60%. Therefore, the aperture ratio of R2 for the back monochromatic light is 34.55%.

[0088] Example 2, Reference Figure 10 The aperture ratio of R1 is 5.68%, the aperture ratio of G1 is 6.84%, and the aperture ratio of B1 is 13.68%. The front luminous brightness ratio = (60 × 5.68% + 120 × 6.84% + 6 × 13.68%) × 94% = the back luminous brightness ratio = (120 × aperture ratio of G2) × 60%. Therefore, the aperture ratio of G2 with a monochromatic back side is 16.23%.

[0089] Example 3, Reference Figure 9 The aperture ratios of R1, G1, and B1 are 5.68%, G1, and 13.68%, respectively. The front luminance ratio is calculated as (60 × 5.68% + 120 × 6.84% + 6 × 13.68%) × 94%, while the back luminance ratio is calculated as (120 × B2 aperture ratio) × 60%. This gives a calculated back monochrome aperture ratio of 324.73% for B2. However, the actual aperture ratio cannot exceed 100%. Therefore, the monochrome pixel aperture ratio of B2 is designed to be 40% of the maximum designed aperture ratio. In this case, 40% / 325% = 7.39%, meaning the back brightness is only 7.39% of the front brightness.

[0090] Example 4, Reference Figure 2 The aperture ratios of R1, G1, B1, R2, and B2 are 5.68% and 6.84% respectively. The front luminous intensity ratio is calculated as (60 × 5.68% + 120 × 6.84% + 6 × 13.68%) × 94% = 11.69, and the back luminous intensity ratio is calculated as (60 × 5.68% + 120 × G2 aperture ratio + 6 × 13.68%) × 60% × 2 = 11.69. Therefore, the aperture ratio of G2 on the back side is 4.59%.

[0091] Example 5, Reference Figure 5 The aperture ratio of R1 is 5.68%, the aperture ratio of G1 is 6.84%, the aperture ratio of B1 is 13.68%, and the aperture ratio of R2 is 5.68%. The front luminous intensity ratio is calculated as (60 × 5.68% + 120 × 6.84% + 6 × 13.68%) × 94% = 11.69, and the back luminous intensity ratio is calculated as (60 × 5.68% + 120 × G2) × 60% × 2. Therefore, the aperture ratio of G2 is 5.28%.

[0092] In some embodiments, the thickness of the anode of the back-side light-emitting device is less than the thickness of the anode of the front-side light-emitting device, wherein the anode of the light-emitting device is disposed between the substrate layer and the light-emitting layer. The thickness of the cathode of the back-side light-emitting device is greater than the thickness of the cathode of the front-side light-emitting device, wherein the cathode of the light-emitting device is disposed on the side of the light-emitting layer away from the substrate layer.

[0093] For example, Figure 13 This is a schematic partial structural diagram of a double-sided display panel provided in an embodiment of this application. Figure 13 As shown, both the front-facing light-emitting device of the front-facing display pixel 200 and the back-facing light-emitting device of the back-facing display pixel 300 are driven by driving thin-film transistors. The driving transistors may include a semiconductor structure P, a gate G, a source S, and a drain D, with the drain D connected to the anode of the light-emitting device. For example, the front-facing light-emitting device includes a first anode 210, a first light-emitting layer 220, and a first cathode 230, while the back-facing light-emitting device includes a second anode 310, a second light-emitting layer 320, and a second cathode 330. The first anode 210 is connected to its corresponding drain D, and the second anode 310 is connected to its corresponding drain D. A light-shielding layer LS is disposed between the substrate layer 100 and the buffer layer. The light-shielding layer LS is used to block the light emitted by the front-facing light-emitting device, preventing the light emitted from the substrate layer 100 from affecting the back-facing display image. Therefore, the orthographic projection of the first light-emitting layer 220 onto the substrate layer 100 falls onto the orthographic projection of the light-shielding layer LS onto the substrate layer 100. The gate insulating layer GI and the inter-insulating layer ILD provide insulation, the planarization layer PLN provides both insulation and planarization, the pixel delimiting structure PDL is used to space different light-emitting devices, and the encapsulation layer TFE protects the light-emitting devices. Light emitted from the first light-emitting layer 220 exits from the first light-emitting side D1, and light emitted from the second light-emitting layer 320 exits from the second light-emitting side D2. Therefore, the thickness of the first anode 210 is greater than the thickness of the second anode 310 to facilitate the exit of light from the second light-emitting layer 320 from the second light-emitting side D2 and to prevent the second anode 310 from affecting light transmittance. The thickness of the first cathode 230 is less than the thickness of the second cathode 330 to prevent the first cathode 230 from affecting the exit of light from the first light-emitting layer 220 from the first light-emitting side D1.

[0094] For example, the cathode material can be a combination of magnesium and silver, or a combination of magnesium and aluminum. The thickness of the first cathode 230 can be about 10 nm, and the thickness of the second cathode 330 can be about 300 nm.

[0095] In some embodiments, the anode of the light-emitting device includes a first transparent conductive layer, a second transparent conductive layer, and a metal layer, with the metal layer disposed between the first and second transparent conductive layers; the thickness of the metal layer of the anode of the back-side light-emitting device is less than the thickness of the metal layer of the anode of the front-side light-emitting device.

[0096] For example, the anode may include an ITO (indium tin oxide) / Ag / ITO three-layer film structure. The first and second transparent conductive layers can be ITO. The ITO thickness of the first anode 210 and the second anode 310 can be the same. The metal layer can be Ag. The Ag thickness of the first anode 210 can be 100±20 nm, and the Ag thickness of the second anode 310 can be about 20 nm. The thickness of a single ITO layer can be 10±5 nm.

[0097] In some embodiments, the cathode of the back-emitting device and the cathode of the front-emitting device are driven independently. It should be noted that independent driving allows the front-emitting device and the back-emitting device to be lit independently, so the front display screen and the back display screen can be independent. The cathodes of the front-emitting device and the back-emitting device are independently set and connected with independent cathode signal leads. They can be set on the same layer or on different layers. This application does not make specific limitations.

[0098] refer to Figure 13 The orthographic projection of the anode of the back-emitting device onto the substrate layer does not overlap with the orthographic projection of the anode of the front-emitting device onto the substrate layer. That is, the first anode 210 and the second anode 310 have no overlapping area in the thickness direction. The first anode 210 and the second anode 310 can be set in the same layer, that is, they can be prepared by the same or the same multiple processes. The second anode 310 does not need to be prepared separately. Different thicknesses can be obtained by using a semi-transparent mask in a single exposure, development and etching process to obtain two or more anodes of different thicknesses.

[0099] In some implementations, reference Figure 13The orthographic projection of the cathode of the back-side light-emitting device onto the substrate layer does not overlap with the orthographic projection of the cathode of the front-side light-emitting device onto the substrate layer; that is, the first cathode 230 and the second cathode 330 have no overlapping area in the thickness direction. Similarly, the first cathode 230 and the second cathode 330 can be disposed in the same layer, that is, the first cathode 230 and the second cathode 330 can be prepared by the same or the same multiple processes, and the second cathode 330 does not need to be prepared separately, which can save process steps, shorten the production time of double-sided display panels, and avoid increasing production costs.

[0100] It should be noted that the number of pixel units on the back is greater than that on the front, which increases the brightness of the back display and balances it with the brightness of the front display. The increased number of front pixel units is primarily for low-to-medium PPI products, allowing for independent display. The ratio of front to back pixel units is 1:2, and the number of data signal lines on the back also needs to be doubled. When the light-emitting layers on both the front and back are deposited simultaneously, the number of openings in the mask panel needs to be increased accordingly. Furthermore, independent driver chips can be bonded to the front and back to achieve independent display of the images on each side.

[0101] A second aspect of this application provides a dual-sided display device. Figure 14 This is a schematic structural diagram of a double-sided display device provided in an embodiment of this application. Figure 14 As shown, the dual-sided display device provided in this application embodiment includes: a dual-sided display panel 1000 as described in the first aspect.

[0102] It should be noted that the double-sided display panel provided in this application embodiment can be a display such as a smartphone, tablet, laptop or television. The display can also be used in billboards, etc., and can also be used in foldable display devices. This application embodiment does not make specific limitations.

[0103] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0104] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0105] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0106] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A double-sided display panel, characterized in that, include: Substrate layer; Front-facing display pixels; The back display pixels are disposed on the same side of the substrate layer, and the light-emitting sides of the front display pixels and the back display pixels are opposite to each other. The front luminance ratio is equal to the back luminance ratio. The front luminance ratio is the product of the aperture ratio of the front display pixel and the luminous efficiency of the front pixel and the luminance loss rate of the front display. The back luminance ratio is the product of the aperture ratio of the back display pixel and the luminous efficiency of the back pixel and the luminance loss rate of the back display. The front display pixels include at least two types of front light-emitting devices, and different types of front light-emitting devices emit different colors of light; The rear display pixel includes at least one rear light-emitting device, and different types of rear light-emitting devices emit light of different colors; The aperture ratio of any type of front-emitting device is calculated based on the aperture ratio of other types of front-emitting devices and the aperture ratio of the back-emitting device; When the rear display pixel includes at least two types of rear-emitting devices, the aperture ratio of any type of rear-emitting device is calculated based on the aperture ratio of other types of rear-emitting devices and the aperture ratio of the front-emitting device.

2. The double-sided display panel according to claim 1, characterized in that, When the front display pixel includes at least two of the front light-emitting devices, the front light emission brightness ratio is the sum of the products of the aperture ratio and luminous efficiency of each of the front light-emitting devices, and then the product of the front display brightness loss rate. When the rear display pixel includes at least two of the rear light-emitting devices, the rear light emission brightness ratio is the sum of the products of the aperture ratio and luminous efficiency of each of the rear light-emitting devices, and then the product of the rear display brightness loss rate.

3. The double-sided display panel according to claim 1, characterized in that, The front display pixels include red front light-emitting devices, green front light-emitting devices, and blue front light-emitting devices; The rear display pixels include red rear light-emitting devices and / or green rear light-emitting devices and / or blue rear light-emitting devices.

4. The double-sided display panel according to claim 3, characterized in that, The aperture ratio of the red front-facing light-emitting device is smaller than that of the green front-facing light-emitting device, and the aperture ratio of the green front-facing light-emitting device is smaller than that of the blue front-facing light-emitting device. When the rear display pixel includes the red rear light-emitting device, the green rear light-emitting device, and the blue rear light-emitting device, the aperture ratio of the red rear light-emitting device is greater than that of the green rear light-emitting device, and the aperture ratio of the red rear light-emitting device is less than that of the blue rear light-emitting device; When the rear display pixel includes the red rear light-emitting device, the aperture ratio of the red rear light-emitting device is a first aperture ratio; when the rear display pixel includes the green rear light-emitting device, the aperture ratio of the green rear light-emitting device is a second aperture ratio; when the rear display pixel includes the blue rear light-emitting device, the aperture ratio of the blue rear light-emitting device is a third aperture ratio; the first aperture ratio is greater than the second aperture ratio, and the first aperture ratio is less than the third aperture ratio.

5. The double-sided display panel according to claim 1, characterized in that, The front display pixels are divided into multiple front pixel units, and each front pixel unit includes at least two types of front light-emitting devices; The rear display pixels are divided into multiple rear pixel units, and each rear pixel unit includes at least one of the rear light-emitting devices; The ratio of the number of front pixel units to the number of back pixel units is 1:2, 2:1, or 1:

1.

6. The double-sided display panel according to claim 5, characterized in that, The front pixel units and the back pixel units are arranged alternately.

7. The double-sided display panel according to claim 1, characterized in that, The orthographic projection of the front-facing light-emitting device on the substrate layer does not overlap with the orthographic projection of the back-facing light-emitting device on the substrate layer.

8. The double-sided display panel according to claim 1, characterized in that, The thickness of the anode of the back-side light-emitting device is less than the thickness of the anode of the front-side light-emitting device, wherein the anode of the light-emitting device is disposed between the substrate layer and the light-emitting layer.

9. The double-sided display panel according to claim 8, characterized in that, The anode of the light-emitting device includes a first transparent conductive layer, a second transparent conductive layer, and a metal layer, wherein the metal layer is disposed between the first transparent conductive layer and the second transparent conductive layer; The metal layer thickness of the anode of the rear-facing light-emitting device is less than the metal layer thickness of the anode of the front-facing light-emitting device.

10. The double-sided display panel according to claim 8, characterized in that, The thickness of the cathode of the back-side light-emitting device is greater than the thickness of the cathode of the front-side light-emitting device, wherein the cathode of the light-emitting device is disposed on the side of the light-emitting layer away from the substrate layer.

11. The double-sided display panel according to claim 10, characterized in that, The cathode of the rear-facing light-emitting device and the cathode of the front-facing light-emitting device are driven independently.

12. The double-sided display panel according to claim 10, characterized in that, The orthographic projection of the anode of the rear-facing light-emitting device onto the substrate layer does not overlap with the orthographic projection of the anode of the front-facing light-emitting device onto the substrate layer; and / or, The orthographic projection of the cathode of the rear-facing light-emitting device onto the substrate layer does not overlap with the orthographic projection of the cathode of the front-facing light-emitting device onto the substrate layer; and / or, The anode of the rear-side light-emitting device is disposed in the same layer as the anode of the front-side light-emitting device; and / or, The cathode of the rear-side light-emitting device is disposed in the same layer as the cathode of the front-side light-emitting device.

13. A double-sided display device, characterized in that, include: The double-sided display panel as described in any one of claims 1-12.

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