High-contrast double-layer TFT mini-LED display screen

Abstract

The utility model discloses a high-contrast double-layer TFT mini-LED display screen which comprises a mini-LED backlight layer, a lower-layer TFT unit is arranged on the upper surface of the mini-LED backlight layer, an OCA adhesive layer is arranged on the upper surface of the lower-layer TFT unit, an upper-layer TFT unit is arranged on the upper surface of the OCA adhesive layer, the lower-layer TFT unit comprises a lower-layer TFT polaroid and a lower-layer mono TFT layer, and the lower-layer TFT polaroid comprises a lower-layer TFT polaroid and a lower-layer mono TFT layer. The upper-layer TFT unit comprises an upper-layer mono TFT layer, a lower-layer FPC board is arranged at the edge of the lower-layer mono TFT layer, a lower-layer bonding pad is arranged at the edge of the upper surface of the lower-layer FPC board, the upper-layer TFT unit comprises an upper-layer color TFT layer and an upper-layer color TFT polaroid, an upper-layer FPC board is arranged at the edge of the upper-layer color TFT layer, an upper-layer bonding pad is arranged at the edge of the lower surface of the upper-layer FPC board, and a lower-layer bonding pad is arranged at the edge of the lower surface of the upper-layer bonding pad. And the upper layer bonding pad is connected with the lower layer bonding pad in a welding manner. And through the double-layer TFT structure, the display contrast is effectively improved, and the cost is also saved.

Description

Technical Field

[0001] The utility model relates to a mini-LED display screen, and more precisely, to a double-layer TFT mini-LED display screen with high contrast. Background Art

[0002] Traditional LCD display screens have certain limitations in contrast, especially when displaying high-dynamic-range content, it is difficult to achieve an ideal visual effect. To solve this problem, the industry has developed various technologies, such as OLED and QLED, etc. However, these technologies still pose challenges in terms of cost, lifespan, etc. The multi-zone mini-LED backlight technology has attracted attention due to its high brightness, long lifespan, and cost-effectiveness. The more the number of mini-LED zones, the finer the display, but the higher the cost. How to further improve its contrast and save costs is the focus of current research.

[0003] Chinese Utility Model Patent Document CN215642161U discloses a Mini-LED display module, including a cover plate, a TFT-LCD, and a Mini-LED backlight module. The cover plate is bonded to the TFT-LCD through an optical adhesive. The TFT-LCD is fixedly connected to the Mini-LED backlight module through a frame connecting member. The frame connecting member frames the TFT-LCD inside the frame connecting member for supporting and fixing, and the upper end of the frame connecting member is bonded to the lower surface of the cover plate. The frame connecting member frames the Mini-LED backlight module inside the frame connecting member and below the TFT-LCD for fixing. The frame connecting member is a rubber frame, and an integral boss is provided inside the rubber frame for supporting and fixing the TFT-LCD. The frame connecting member is a combination of a bracket and a rubber frame, where the rubber frame is bonded to the lower surface of the cover plate and fixed on the bracket, and the bracket is used for supporting and fixing the TFT-LCD. The Mini-LED backlight module includes an optical component, a light source component, and a mounting structure member stacked and assembled in sequence from top to bottom.

[0004] Obviously, this patent optimizes the structure of the connecting member and the mounting structure member of the backlight module, and optimizes the structure of the Mini-LED backlight module and the entire display module. However, this structure cannot solve the existing problems of contrast and cost. Summary of the Utility Model

[0005] Based on this, it is necessary to provide a high-contrast double-layer TFT mini-LED display screen for the above-mentioned technical problems. The high-contrast double-layer TFT mini-LED display screen includes a mini-LED backlight layer. A lower-layer TFT unit is provided on the upper surface of the mini-LED backlight layer. An OCA glue layer is provided on the upper surface of the lower-layer TFT unit. An upper-layer TFT unit is provided on the upper surface of the OCA glue layer. The lower-layer TFT unit includes a lower-layer TFT polarizer and a lower-layer mono TFT layer. A lower-layer FPC board is provided at the edge of the lower-layer mono TFT layer. Lower-layer pads are provided at the edge of the upper surface of the lower-layer FPC board. The upper-layer TFT unit includes an upper-layer color TFT layer and an upper-layer color TFT polarizer. An upper-layer FPC board is provided at the edge of the upper-layer color TFT layer. Upper-layer pads are provided at the edge of the lower surface of the upper-layer FPC board. The upper-layer pads are welded to the lower-layer pads. Pixels are provided on the lower-layer mono TFT layer of the lower-layer TFT unit. Each pixel includes three sub-pixels, but these sub-pixels do not have red, green, and blue color films. The lower-layer mono TFT layer communicates synchronously with the upper-layer color TFT layer to display the same patterns and brightness and darkness gray levels. When not displaying, the area is displayed in full black to improve the high-contrast effect of the patterns. At the same time, pixels are provided on the upper-layer color TFT layer of the upper-layer TFT unit. Each pixel also includes three sub-pixels and is equipped with red, green, and blue color films. The upper-layer color TFT layer is responsible for displaying the color information of the image and works in cooperation with the lower-layer mono TFT layer of the lower layer to jointly improve the display effect. Through the double-layer TFT structure, the display contrast is effectively improved, and the cost is also saved.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A high-contrast double-layer TFT mini-LED display screen, characterized in that the high-contrast double-layer TFT mini-LED display screen includes a mini-LED backlight layer. A lower-layer TFT unit is provided on the upper surface of the mini-LED backlight layer. An OCA glue layer is provided on the upper surface of the lower-layer TFT unit. An upper-layer TFT unit is provided on the upper surface of the OCA glue layer.

[0008] The lower-layer TFT unit includes a lower-layer TFT polarizer and a lower-layer mono TFT layer. A lower-layer FPC board is provided at the edge of the lower-layer mono TFT layer. Lower-layer pads are provided at the edge of the upper surface of the lower-layer FPC board.

[0009] The upper TFT unit comprises an upper color TFT layer and an upper color TFT polarizer. An upper FPC board is provided at the edge of the upper color TFT layer. An upper soldering pad is provided at the edge of the lower surface of the upper FPC board. The upper soldering pad is welded to the lower soldering pad.

[0010] As a preferred implementation of the high-contrast double-layer TFT mini-LED display provided by the utility model, the lower TFT polarizer faces the mini-LED backlight layer.

[0011] As a preferred implementation of the high-contrast double-layer TFT mini-LED display provided by the utility model, the upper color TFT layer faces the OCA glue layer.

[0012] As a preferred implementation of the high-contrast double-layer TFT mini-LED display provided by the utility model, the mini-LED backlight layer includes 16 backlight partitions.

[0013] As a preferred implementation of the high-contrast double-layer TFT mini-LED display provided by the utility model, the backlight partitions are independent of each other.

[0014] As a preferred implementation of the high-contrast double-layer TFT mini-LED display provided by the utility model, 15 mini-LEDs are provided on the backlight partition.

[0015] As a preferred implementation of the high-contrast double-layer TFT mini-LED display provided by the utility model, an isolation glue layer is provided between the lower FPC board and the upper FPC board.

[0016] As a preferred implementation of the high-contrast double-layer TFT mini-LED display provided by the utility model, the isolation rubber layer is made of elastic rubber.

[0017] As a preferred implementation of the high-contrast double-layer TFT mini-LED display provided by the utility model, a plurality of penetrating heat dissipation channels are provided in the isolation adhesive layer.

[0018] As a preferred implementation of the high-contrast double-layer TFT mini-LED display provided by the utility model, the cross-section of the heat dissipation channel is circular.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The present utility model provides a high-contrast double-layer TFT mini-LED display screen. On the lower mono TFT layer of the lower TFT unit, pixels are provided, and each pixel includes three sub-pixels, but these sub-pixels do not have red, green, and blue color films. The lower mono TFT layer communicates synchronously with the upper color TFT layer, displaying the same pattern and brightness and darkness gray levels. When not displaying, the area is fully black, improving the high-contrast effect of the pattern. At the same time, on the upper color TFT layer of the upper TFT unit, pixels are provided, and each pixel also includes three sub-pixels and is equipped with red, green, and blue color films. The upper color TFT layer is responsible for displaying the color information of the image and works in coordination with the lower mono TFT layer of the lower layer to jointly improve the display effect. Through the double-layer TFT structure, the display contrast is effectively improved, and the cost is also saved.

[0021] In addition, the mini-LED backlight layer can be made to include 11 backlight zones. These backlight zones are independent of each other. 15 mini-LEDs are provided on the backlight zone. The mini-LED backlight layer uses mini-LED backlight technology. By precisely controlling the brightness of each zone's mini-LED, local dimming is achieved, and it can be dynamically adjusted according to the content displayed on the upper color TFT to optimize the contrast, thereby improving the contrast of the display screen.

[0022] In addition, an isolation adhesive layer can be provided between the lower FPC board and the upper FPC board. The isolation adhesive layer is made of elastic rubber. In addition, several through heat dissipation channels are provided in the isolation adhesive layer. The cross-section of the heat dissipation channel is circular. By using the isolation adhesive layer, the support strength between the lower FPC board and the upper FPC board can be effectively improved. By using the heat dissipation channels, the local heat dissipation performance can be effectively improved, thereby improving the reliability of the display device. Brief Description of the Drawings

[0023] In order to more clearly illustrate the solutions in the present utility model, the following will give a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic diagram of the hierarchical structure of the high-contrast double-layer TFT mini-LED display screen of the present utility model;

[0025] Figure 2 is Figure 1 a schematic diagram of the hierarchical structure of the high-contrast double-layer TFT mini-LED display screen in [reference], and at this time it is in the welding mode;

[0026] Figure 3 For Figure 1 a schematic structural diagram of the mini-LED backlight layer of the high-contrast double-layer TFT mini-LED display screen in

[0027] Figure 4 a schematic hierarchical structure diagram of another embodiment of the high-contrast double-layer TFT mini-LED display screen of the present invention;

[0028] The markings in the figure are explained as follows: 1. mini-LED backlight layer; 11. backlight partition; 2. lower-layer TFT unit; 21. lower-layer TFT polarizer; 22. lower-layer mono TFT layer; 23. lower-layer FPC board; 24. lower-layer pad; 3. OCA glue layer; 33. upper-layer pad; 4. upper-layer TFT unit; 41. upper-layer color TFT layer; 42. upper-layer color TFT polarizer; 43. upper-layer FPC board; 45. isolation glue layer; 46. heat dissipation channel. Detailed implementation manners

[0029] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0030] As described in the background art, for the existing LCD display screens, there are certain limitations in the contrast of traditional LCD display screens. Especially when displaying high-dynamic-range content, it is difficult to achieve an ideal visual effect. To solve this problem, the industry has developed various technologies, such as OLED and QLED, etc. However, these technologies still face challenges in terms of cost, lifespan, etc. The multi-zone mini-LED backlight technology has attracted attention due to its high brightness, long lifespan, and cost-effectiveness. The more mini-LED zones there are, although the display is more delicate, the cost will also be higher. How to further improve its contrast and save costs is the current research focus.

[0031] To solve this technical problem, the present utility model provides a double-layer TFT mini-LED display screen with high contrast, which includes a mini-LED backlight layer 1. On the upper surface of the mini-LED backlight layer 1, a lower-layer TFT unit 2 is provided. On the upper surface of the lower-layer TFT unit 2, an OCA glue layer 3 is provided. On the upper surface of the OCA glue layer 3, an upper-layer TFT unit 4 is provided. The lower-layer TFT unit 2 includes a lower-layer TFT polarizer 21 and a lower-layer mono TFT layer 22. At the edge of the lower-layer mono TFT layer 22, a lower-layer FPC board 23 is provided. At the edge of the upper surface of the lower-layer FPC board 23, a lower-layer pad 24 is provided. The upper-layer TFT unit 4 includes an upper-layer color TFT layer 41 and an upper-layer color TFT polarizer 42. At the edge of the upper-layer color TFT layer 41, an upper-layer FPC board 43 is provided. At the edge of the lower surface of the upper-layer FPC board 43, an upper-layer pad 33 is provided. The upper-layer pad 33 is welded and connected to the lower-layer pad 24.

[0032] Through the above structural design, pixels are provided on the lower-layer mono TFT layer 22 of the lower-layer TFT unit 2. Each pixel includes three sub-pixels, but these sub-pixels do not have red, green, and blue color films. The lower-layer mono TFT layer 22 communicates synchronously with the upper-layer color TFT layer 41 to display the same pattern and brightness and darkness gray levels. When not displaying, the area is fully black, improving the high-contrast effect of the pattern. At the same time, pixels are provided on the upper-layer color TFT layer 4 of the upper-layer TFT unit 4. Each pixel also includes three sub-pixels and is equipped with red, green, and blue color films. The upper-layer color TFT layer 4 is responsible for displaying the color information of the image and works in cooperation with the lower-layer mono TFT layer 22 to jointly improve the display effect. Through the double-layer TFT structure, the display contrast is effectively improved, and the cost is also saved.

[0033] To enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be described in detail below in conjunction with the drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model.

[0034] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments can be combined with each other.

[0035] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] Such as Figure 1 and Figure 2As shown, the high-contrast double-layer TFT mini-LED display screen includes a mini-LED backlight layer 1. An underlying TFT unit 2 is provided on the upper surface of the mini-LED backlight layer 1. An OCA adhesive layer 3 is provided on the upper surface of the underlying TFT unit 2. An upper TFT unit 4 is provided on the upper surface of the OCA adhesive layer 3.

[0037] The underlying TFT unit 2 includes an underlying TFT polarizer 21 and an underlying mono TFT layer 22. An underlying FPC board 23 is provided at the edge of the underlying mono TFT layer 22. An underlying pad 24 is provided at the edge of the upper surface of the underlying FPC board 23.

[0038] The upper TFT unit 4 includes an upper color TFT layer 41 and an upper color TFT polarizer 42. An upper FPC board 43 is provided at the edge of the upper color TFT layer 41. An upper pad 33 is provided at the edge of the lower surface of the upper FPC board 43. The upper pad 33 is welded to the underlying pad 24.

[0039] It should be noted that the underlying TFT polarizer 21 faces the mini-LED backlight layer 1. The upper color TFT layer 41 faces the OCA adhesive layer 3.

[0040] The working mode of this embodiment will be described below.

[0041] Pixels are provided on the underlying mono TFT layer 22 of the underlying TFT unit 2. Each pixel includes three sub-pixels, but these sub-pixels do not have red, green, and blue color films. The underlying mono TFT layer 22 communicates synchronously with the upper color TFT layer 41 to display the same pattern and brightness and darkness gray levels. When not displaying, the area is displayed as completely black, improving the high-contrast effect of the pattern. At the same time, pixels are provided on the upper color TFT layer 4 of the upper TFT unit 4. Each pixel also includes three sub-pixels and is equipped with red, green, and blue color films. The upper color TFT layer 4 is responsible for displaying the color information of the image and works in cooperation with the underlying mono TFT layer 22 of the lower layer to jointly improve the display effect. Through the double-layer TFT structure, the display contrast is effectively improved, and the cost is also saved.

[0042] As Figure 3 shown, the high-contrast double-layer TFT mini-LED display screen provided in Embodiment 1 is further optimized. Specifically, the mini-LED backlight layer 1 includes 16 backlight partitions 11.

[0043] It should be noted that the backlight partitions 11 are independent of each other.

[0044] In addition, 15 mini-LEDs are provided on the backlight partition 11.

[0045] The working mode of this embodiment will be described below.

[0046] The mini-LED backlight layer 1 uses mini-LED backlight technology. By precisely controlling the brightness of each partition of the mini-LEDs, local dimming is achieved, and it can be dynamically adjusted according to the content displayed on the upper-layer color TFT, so as to optimize the contrast, thereby improving the contrast of the display screen.

[0047] As Figure 4 shown, the high-contrast double-layer TFT mini-LED display screen provided in Embodiment 1 or 2 is further optimized. Specifically, an isolation adhesive layer 45 is provided between the lower-layer FPC board 23 and the upper-layer FPC board 43.

[0048] It should be noted that the isolation adhesive layer 45 is made of elastic rubber. In addition, a number of through heat dissipation channels 46 are provided in the isolation adhesive layer 45.

[0049] The cross-section of the heat dissipation channel 46 is circular.

[0050] The working mode of this embodiment will be described below.

[0051] By using the isolation adhesive layer 45, the support strength between the lower-layer FPC board 23 and the upper-layer FPC board 43 can be effectively improved. By using the heat dissipation channels 46, the local heat dissipation performance can be effectively improved, thereby improving the reliability of the display device.

[0052] The terms "coupled" and "coupled" involved in the embodiments of the present application should be understood in a broad sense. For example, it can refer to a direct physical connection, or an indirect connection realized through electronic devices, such as a connection realized through resistors, inductors, capacitors or other electronic devices.

[0053] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0054] Obviously, the embodiments described above are only a part of the embodiments of this application, rather than all of them. The accompanying drawings present preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of this application more thorough and comprehensive. Although this application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structures made by using the content of this application's specification and drawings, directly or indirectly applied in other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A double-layer TFT mini-LED display screen with high contrast, characterized in that, The described high-contrast double-layer TFT mini-LED display screen includes a mini-LED backlight layer (1). On the upper surface of the mini-LED backlight layer (1), a lower-layer TFT unit (2) is provided. On the upper surface of the lower-layer TFT unit (2), an OCA glue layer (3) is provided. On the upper surface of the OCA glue layer (3), an upper-layer TFT unit (4) is provided. The lower-layer TFT unit (2) includes a lower-layer TFT polarizer (21) and a lower-layer mono-TFT layer (22). At the edge of the lower-layer mono-TFT layer (22), a lower-layer FPC board (23) is provided. At the edge of the upper surface of the lower-layer FPC board (23), a lower-layer pad (24) is provided. The upper-layer TFT unit (4) includes an upper-layer color TFT layer (41) and an upper-layer color TFT polarizer (42). At the edge of the upper-layer color TFT layer (41), an upper-layer FPC board (43) is provided. At the edge of the lower surface of the upper-layer FPC board (43), an upper-layer pad (33) is provided. The upper-layer pad (33) is welded to the lower-layer pad (24).

2. The high-contrast double-layer TFT mini-LED display screen according to claim 1, wherein, The described lower-layer TFT polarizer (21) faces the mini-LED backlight layer (1).

3. The high-contrast double-layer TFT mini-LED display screen according to claim 1, wherein, The described upper-layer color TFT layer (41) faces the OCA glue layer (3).

4. The high-contrast double-layer TFT mini-LED display screen according to claim 1, characterized in that, The described mini-LED backlight layer (1) includes 16 backlight zones (11).

5. The high-contrast double-layer TFT mini-LED display screen according to claim 4, wherein, The backlight zones (11) are independent of each other.

6. The high-contrast double-layer TFT mini-LED display screen according to claim 4, wherein Fifteen mini-LEDs are provided on the backlight zones (11).

7. The high-contrast double-layer TFT mini-LED display screen according to claim 1, characterized in that, An isolation glue layer (45) is provided between the lower-layer FPC board (23) and the upper-layer FPC board (43).

8. The high-contrast double-layer TFT mini-LED display screen according to claim 7, characterized in that The isolation glue layer (45) is made of elastic rubber.

9. The high-contrast double-layer TFT mini-LED display screen according to claim 8, characterized in that, A number of through heat dissipation channels (46) are provided in the isolation glue layer (45).

10. The high-contrast dual-layer TFT mini-LED display screen according to claim 9, characterized in that, The cross-section of the heat dissipation channel (46) is circular.

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