Mini-led display backplane

Abstract

The utility model relates to a kind of Mini-LED display backboard, including substrate, substrate has first plate body surface and second plate body surface, it is characterized by: the middle region of the first plate body surface is equipped with middle LED group, and middle LED group is composed of multiple LED;The edge region of the first plate body surface is equipped with edge LED group, and edge LED group is composed of multiple LED;The LED dot matrix density of edge LED group is greater than the LED dot matrix density of middle LED group.This Mini-LED display backboard not only can improve brightness uniformity, but also can avoid the phenomenon of "color deviation", which is beneficial to improve visual display effect.

Description

Technical Field

[0001] This utility model relates to the field of display technology, specifically to a Mini-LED display backplate. Background Technology

[0002] In recent years, Mini-LED display technology has gradually become an important development direction in the field of high-end LCD backlighting due to its advantages such as high brightness, high contrast and fine local dimming.

[0003] Mini-LED display back panels achieve high-precision local brightness adjustment by dividing the backlight into multiple independently controllable dimming zones, significantly improving the contrast and overall brightness of LCD displays, thereby greatly enhancing the visual display effect. However, in practical applications, due to the characteristics of the back panel structure and optical design, the light emitted by Mini-LEDs located at the edges tends to leak out from the sides of the back panel and cannot be effectively guided to the display panel. This results in the brightness of the edge areas of the display panel being significantly lower than that of the center area, causing uneven brightness (commonly known as "edge shadows" or "mura effect"), which seriously affects the consistency of the display and the visual effect.

[0004] To address these issues, current solutions typically compensate by increasing the brightness of LEDs located at the edges. For example, the driving circuit can increase the current to these edge LEDs, causing them to emit light at a higher brightness than normal, thus seemingly compensating for the brightness loss caused by light leakage. While this approach can improve brightness uniformity to some extent, increasing the driving current leads to a sharp increase in heat generation from the edge LEDs. Since the light-emitting characteristics of LEDs are closely related to junction temperature, increased temperature causes a wavelength shift, resulting in changes in color coordinates. This manifests as color inconsistencies between the edge and center regions, a phenomenon known as "color shift," leading to color unevenness. Furthermore, prolonged high-current operation significantly accelerates LED chip decay, reducing their lifespan and consequently the overall lifespan of the Mini-LED display backplane. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a Mini-LED display backplate that not only improves brightness uniformity but also avoids color shift, thereby improving the visual display effect. The technical solution adopted is as follows: A Mini-LED display backplate includes a substrate, the substrate having a first plate surface and a second plate surface, characterized in that: a central LED group is provided in the middle region of the first plate surface, the central LED group being composed of multiple LEDs; an edge LED group is provided in the edge region of the first plate surface, the edge LED group being composed of multiple LEDs; the LED dot matrix density of the edge LED group is greater than the LED dot matrix density of the central LED group.

[0006] The LED dot matrix density refers to the number of LED light-emitting points distributed per unit area on the first plate surface of the substrate.

[0007] In the aforementioned Mini-LED display back panel, the substrate can be a glass substrate or a PCB board. A driving circuit is pre-installed on the first surface of the board, and the driving circuit has multiple LED pads, with each LED soldered onto its corresponding LED pad. By setting a central LED group in the middle area of ​​the substrate and an edge LED group in the edge area, and making the LED matrix density of the edge LED group greater than that of the central LED group, the brightness of the LEDs in the edge area can be greater than that in the central area, provided that the LEDs in the edge area emit light normally. This can effectively compensate for the light leakage brightness loss caused by the edge area, thereby improving the brightness uniformity of the Mini-LED display back panel. Moreover, since there is no need for the driving circuit to increase the LED current in the edge area, the phenomenon of "color shift" can be avoided, which is beneficial to improving the visual display effect.

[0008] As a preferred embodiment of this utility model, the LED dot matrix density of the edge LED group is 1.2 to 2 times that of the LED dot matrix density of the middle LED group.

[0009] As a further preferred embodiment of this utility model, the LED dot matrix density of the edge LED group is twice that of the LED dot matrix density of the middle LED group.

[0010] In a preferred embodiment of this invention, the LEDs in the middle LED group and the LEDs in the edge LED group are all driven by the same driving circuit. The driving circuit can be dynamic or static, or it can be serial (each LED has a chip that can receive serial signals) or address-based (each LED's chip has an address written on it, allowing it to receive signals according to that address). Specifically, the brightness of the edge LED group can be set via software, which simplifies the circuit design.

[0011] As a preferred embodiment of this utility model, the LEDs in the intermediate LED group form an array.

[0012] As a further preferred embodiment of this utility model, each LED in the intermediate LED group forms a rectangular array.

[0013] As a further preferred embodiment of this invention, each LED constituting the edge LED group includes multiple first LEDs and multiple second LEDs. Each first LED forms the same array as each LED in the middle LED group, and each second LED is respectively disposed between corresponding adjacent first LEDs. This allows for a more natural transition of the LEDs in the edge and middle LED groups from the middle region to the edge region of the substrate, preventing brightness variations in the transition area caused by array misalignment, and further improving the brightness uniformity of the Mini-LED display back panel.

[0014] As a further preferred embodiment of this utility model, the position of the second LED is closer to the edge region than the position of the first LED.

[0015] As a further preferred embodiment of this utility model, each of the first LEDs and each of the LEDs in the intermediate LED group is driven by a first driving circuit, and each of the second LEDs is driven by a second driving circuit. The first driving circuit and the second driving circuit are independent driving circuits, which have better adjustability and can individually adjust the brightness of each LED in the intermediate LED group and the first and second LEDs in the edge LED group. This allows for better adjustment and compensation of the brightness of LEDs located in the edge area, and makes it easier to achieve brightness uniformity of the Mini-LED display back panel.

[0016] Compared with the prior art, this utility model has the following advantages: This Mini-LED display backplate sets a central LED group in the middle area of ​​the first plate surface of the substrate and an edge LED group in the edge area. The LED dot matrix density of the edge LED group is greater than that of the central LED group. As a result, the brightness of the LEDs in the edge area is greater than that of the LEDs in the center area, provided that the LEDs in the edge area emit light normally. This compensates for the light leakage brightness loss in the edge area, which not only improves the brightness uniformity, but also avoids the phenomenon of "color shift" since there is no need to increase the LED current in the edge area through the driving circuit, thus improving the visual display effect. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of a preferred embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of a preferred embodiment of the present invention, Example 2. Detailed Implementation

[0019] Example 1: As Figure 1As shown, this Mini-LED display back panel includes a substrate 1, which has a first plate surface 101 and a second plate surface. The middle area of ​​the first plate surface 101 is provided with a middle LED group 2, which is composed of multiple LEDs. The edge area of ​​the first plate surface 101 is provided with an edge LED group 3, which is composed of multiple LEDs. The LED dot matrix density of the edge LED group 3 is greater than that of the middle LED group 2.

[0020] In this embodiment, the LED dot matrix density of the edge LED group 3 is twice that of the LED dot matrix density of the middle LED group 2.

[0021] In this embodiment, each LED 21 constituting the middle LED group 2 forms a rectangular array; each LED constituting the edge LED group 3 includes multiple first LEDs 31 and multiple second LEDs 32. Each first LED 31 forms the same array as each LED 21 in the middle LED group 2, and each second LED 32 is respectively disposed between corresponding adjacent first LEDs 31; the position of the second LED 32 is closer to the edge region than the position of the first LED 31. Therefore, the transition from the middle region to the edge region of the substrate 1 between the edge LED group 3 and the middle LED group 2 is more natural, avoiding brightness variations in the transition area caused by array misalignment, and further improving the brightness uniformity of the Mini-LED display back panel.

[0022] In this embodiment, substrate 1 is a glass substrate, and a driving circuit 11 is pre-installed on its first surface 101. The driving circuit 11 has multiple LED pads, and each LED is soldered onto a corresponding LED pad. The LED 21 in the middle LED group 2 and the first LED 31 and second LED 32 in the edge LED group 3 are all driven by the same driving circuit 11. The driving circuit 11 can be a dynamic drive or a static drive, or a serial drive (each LED has a chip that can receive serial signals) or an address-based drive (each LED's chip has an address written on it, and it can receive signals according to the address). Specifically, the brightness of the edge LED group can be set by software, which simplifies the circuit design.

[0023] Example 2: Reference Figure 2While all other parts are the same as in Embodiment 1, the difference lies in the following: In this embodiment, each of the first LEDs 31 and each of the LEDs 21 in the middle LED group 2 are driven by the first driving circuit 12, and each of the second LEDs 32 is driven by the second driving circuit 13. The first driving circuit 12 and the second driving circuit 13 are independent driving circuits 11, which have better adjustability and can individually adjust the brightness of each LED 21 in the middle LED group 2 and the first LEDs 31 and second LEDs 32 in the edge LED group 3. This allows for better adjustment and compensation of the brightness of LEDs located in the edge area, and makes it easier to achieve brightness uniformity of the Mini-LED display back panel.

[0024] Furthermore, it should be noted that the names of the various parts of the specific embodiments described in this specification may differ. All equivalent or simple variations made to the structure, features, and principles of this utility model patent are included within the protection scope of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined by the claims, they should all fall within the protection scope of this utility model.

Claims

1. A Mini-LED display backplate, comprising a substrate, the substrate having a first plate surface and a second plate surface, characterized in that: The middle area of ​​the first plate surface is provided with a middle LED group, which is composed of multiple LEDs; the edge area of ​​the first plate surface is provided with an edge LED group, which is composed of multiple LEDs; the LED dot matrix density of the edge LED group is greater than that of the middle LED group.

2. The Mini-LED display backplate according to claim 1, characterized in that: The LED matrix density of the edge LED group is 1.2 to 2 times that of the LED matrix density of the middle LED group.

3. A Mini-LED display back panel according to claim 1, characterized in that: The LED dot matrix density of the edge LED group is twice that of the LED dot matrix density of the middle LED group.

4. A Mini-LED display backplate according to claim 1, characterized in that: The LEDs in the middle LED group and the LEDs in the edge LED group are all driven by the same driving circuit.

5. A Mini-LED display backplate according to claim 1, characterized in that: The individual LEDs that make up the intermediate LED group form an array.

6. A Mini-LED display backplate according to claim 5, characterized in that: Each LED constituting the edge LED group includes multiple first LEDs and multiple second LEDs. Each first LED forms the same array with each LED in the middle LED group, and each second LED is respectively disposed between corresponding adjacent first LEDs.

7. A Mini-LED display backplate according to claim 6, characterized in that: The second LED is positioned closer to the edge region than the first LED.

8. A Mini-LED display backplate according to claim 6, characterized in that: Each of the first LEDs and each of the LEDs in the intermediate LED group are driven by a first driving circuit, and each of the second LEDs is driven by a second driving circuit.

9. A Mini-LED display backplate according to claim 6, characterized in that: The LEDs in the middle LED group form a rectangular array.

10. A Mini-LED display backplate according to claim 1, characterized in that: The first board surface is provided with a driving circuit, and the driving circuit is provided with multiple LED pads, with each LED being soldered onto the corresponding LED pad.

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