CN218122410U - Backlight module and display device - Google Patents

Abstract

The application discloses a backlight module and a display device, wherein the backlight module comprises a backlight plate, a plurality of main light-emitting units and a plurality of auxiliary light-emitting units are arranged on the backlight plate, the main light-emitting units are arranged in an array mode to form a light-emitting array, and the auxiliary light-emitting units are arranged around the light-emitting array; the backlight module further comprises a compensation control module, the compensation control module receives the light emitting data of the light emitting array, and when the light emitting data is larger than or equal to a first preset value, the auxiliary light emitting unit is controlled to emit light. The proposal can improve the condition that the brightness of the edge area is dark, and can improve the uniformity of the backlight.

Description

Backlight module and display device

Technical Field

The application relates to the technical field of display, in particular to a backlight module and a display device.

Background

At present, more and more show products adopt Mini-LED as the backlight source to show, generally speaking, mini-LED adopts straight following formula, the interval is very little between the lamp pearl, realize the regional dimming of less scope through the densely covered of large quantity, mini-LED's board in a poor light can hold more LEDs in unit area, thereby improve backlight quantity greatly, compare in traditional design in a poor light, can be equipped with better luminance homogeneity in the distance of less mixed light, higher color contrast, can realize terminal product's ultra-thin design, and save the electric energy. . The traditional Mini-LED backlight control technology generally adopts a partition control mode, for example, a one-to-one control mode is adopted, namely, each control partition corresponds to a string of LEDs and the like, and one control of a light emitting control module is set, so that the design of regional brightness adjustment can be carried out, the LEDs are turned off in individual regions to achieve complete black, the power consumption is reduced, and due to the increase of the number of the LEDs in unit area, ultrahigh contrast and fine dynamic distribution are realized, a bright field is brighter, a dark field is darker, and the display effect is better and finer.

However, since the light sources of the LED lamps are scattered light, there is a problem that the scattered light between the light sources of the adjacent LED lamps can be superimposed on each other, but the light source superimposition of the LED lamps at the edge of the display area is weaker than the light source superimposition of the LED lamps in the middle area, and therefore, the luminance in the edge area is slightly darker than the luminance in the middle area under the same luminance input, resulting in poor uniformity of the backlight.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a backlight module and a display device, so that the condition that the brightness of an edge area is dark is improved, and the uniformity of backlight can be improved.

The application discloses a backlight module, which comprises a backlight plate, wherein the backlight plate is provided with a plurality of main light-emitting units and a plurality of auxiliary light-emitting units, the main light-emitting units are arranged in an array manner to form a light-emitting array, and the auxiliary light-emitting units are arranged around the light-emitting array; the backlight module further comprises a compensation control module, the compensation control module receives the light emitting data of the light emitting array, and when the light emitting data is larger than or equal to a first preset value, the auxiliary light emitting unit is controlled to emit light.

Optionally, the light emitting array includes a middle region and an edge region, the edge region is disposed around the middle region, in the light emitting array, the main light emitting unit disposed corresponding to the edge region is a first light emitting unit, and the main light emitting unit disposed corresponding to the middle region is a second light emitting unit; the control template receives the light emitting data of the first light emitting unit, when the light emitting data is larger than or equal to a first preset value, the auxiliary light emitting unit is controlled to emit light, and when the light emitting data is smaller than the first preset value, the auxiliary light emitting unit is controlled not to emit light.

Optionally, a row or a column of the first light-emitting units is respectively disposed around the middle region and in the corresponding edge region; a plurality of the auxiliary light emitting units are disposed around the edge region.

Optionally, the light emitting power of the main light emitting unit is greater than the light emitting power of the auxiliary light emitting unit.

Optionally, the backlight module further includes a gray scale-voltage driving table, where the gray scale-voltage driving table includes a mapping relationship between multiple gray scale data and multiple driving voltage data, and the light-emitting data is gray scale data; and the compensation control module receives gray scale data of the light emitting array, and controls voltage driving data corresponding to the gray scale data to drive the auxiliary light emitting unit to emit light according to the gray scale-voltage driving table when the gray scale data is greater than or equal to a first preset value.

Optionally, the first preset value is greater than or equal to 50 gray scales and less than or equal to 78 gray scales; in the gray scale-voltage driving table, the larger the gray scale data is, the larger the voltage driving data is.

Optionally, the first preset value is 64 gray scales, and in the gray scale-voltage driving table, the gray scale data and the voltage driving data are in a curve relationship.

Optionally, the plurality of main light-emitting units are divided into a plurality of independently controlled control partitions; the backlight module comprises a main light-emitting unit and a backlight module, wherein the main light-emitting unit comprises a light string which comprises a plurality of LED lamps connected in series, the backlight module further comprises a display control module, and the display control module comprises a plurality of control channels and is used for receiving external light-emitting data and respectively controlling the light strings of the control subareas to emit light according to the light-emitting data.

The application also discloses a display device, including display panel and foretell backlight unit, backlight unit does display panel provides the backlight.

Optionally, the display panel includes a display area and a non-display area, the plurality of main light-emitting units are disposed on the backlight plate corresponding to the display area, and the plurality of auxiliary light-emitting units are disposed on the backlight plate corresponding to the non-display area.

The edge of the light emitting array formed by the main light emitting units is provided with the circle of auxiliary light emitting units, the main light emitting units in the edge area are subjected to brightness compensation through the auxiliary light emitting units, the phenomenon that the light source superposition of the LED lamps at the edge is weaker than that of the LED lamps in the middle area is avoided, and therefore the problem that the uniformity of backlight is poor due to the fact that the brightness of the edge area is darker than that of the middle area under the same brightness input condition can be caused. Therefore, the problem of uneven brightness of the edge area is solved, and the uniformity of backlight is improved. The auxiliary light-emitting unit only compensates above the brightness of the first preset value, and controls the auxiliary light-emitting unit not to compensate when the brightness of the light-emitting array is lower than the first preset value. Under the condition that the brightness of the light emitting array is low, the difference between the brightness of the edge LED lamps and the brightness of the middle area is small, and the situation that the brightness of the edge LED lamps is higher than that of the middle LED lamps due to compensation at the moment can be prevented. Through the scheme, the uniformity of the backlight module is better.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic view of a backlight module according to the present application;

FIG. 2 is a schematic diagram of a primary lighting unit of the present application;

FIG. 3 is a schematic diagram of a display control module of the present application;

fig. 4 is a schematic view of a display device of the present application.

10, a display device; 20. a backlight module; 30. a display panel; 100. a backlight plate; 110. a main light emitting unit; 111. a light emitting array; 112. a first light emitting unit; 113. a second light emitting unit; 120. an auxiliary light emitting unit; 140. a display control module; 141. a control circuit; 142. a logic circuit; 143. a power supply circuit; 150. a middle region; 151. an edge region.

Detailed Description

It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.

In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless stated otherwise, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. Also, terms of orientation or positional relationship indicated by "upper", "lower", "left", "right", "vertical", "horizontal", etc., are described based on the orientation or relative positional relationship shown in the drawings, and are only for convenience of simplifying the description of the present application, and do not indicate that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The present application is described in detail below with reference to the figures and alternative embodiments.

Fig. 1 is a schematic view of a backlight module according to the present application, and as shown in fig. 1, the present application discloses a backlight module 20, which includes a backlight plate 100, where the backlight plate 100 is provided with a plurality of main light emitting units 110 and a plurality of auxiliary light emitting units 120, the plurality of main light emitting units 110 are arranged in an array to form a light emitting array 111, and the plurality of auxiliary light emitting units 120 are arranged around the light emitting array 111; the backlight module 20 further includes a compensation control module, which receives the light emitting data of the light emitting array 111, and controls the auxiliary light emitting unit 120 to emit light when the light emitting data is greater than or equal to a first preset value.

According to the LED backlight module, the auxiliary light-emitting units 120 are arranged at the edges of the light-emitting array 111 formed by the main light-emitting units 110, the brightness compensation is carried out on the main light-emitting units 110 of the edge area 151 through the auxiliary light-emitting units 120, and the phenomenon that the light source superposition of the LED lamps at the edge is weaker than that of the LED lamps in the middle area 150 is prevented, so that the condition that the brightness of the edge area 151 is darker than that of the middle area 150 under the condition of the same brightness input is caused, and the problem that the uniformity of backlight is poor is caused. Thereby improving the problem of non-uniform brightness of the edge region 151 and improving the uniformity of the backlight. The auxiliary light-emitting unit 120 only compensates above the first preset value, and controls the auxiliary light-emitting unit 120 not to compensate when the brightness of the light-emitting array 111 is lower than the first preset value. When the brightness of the light emitting array 111 is low, the difference between the brightness of the edge LED lamps and the brightness of the middle area 150 is small, so that the situation that the brightness of the edge LED lamps is higher than that of the middle LED lamps due to compensation at this time can be prevented. The backlight module 20 has better uniformity through the scheme.

Specifically, the light emitting array 111 includes a middle region 150 and an edge region 151, the edge region 151 is disposed around the middle region 150, in the light emitting array 111, the main light emitting unit 110 disposed corresponding to the edge region 151 is a first light emitting unit 112, and the main light emitting unit 110 disposed corresponding to the middle region 150 is a second light emitting unit 113; the control template receives the light emitting data of the first light emitting unit 112, controls the auxiliary light emitting unit 120 to emit light when the light emitting data is greater than or equal to a first preset value, and controls the auxiliary light emitting unit 120 not to emit light when the light emitting data is smaller than the first preset value.

In the present embodiment, the middle region 150 and the edge region 151 are mainly divided according to the light emitting array 111 formed by the plurality of main light emitting units 110, the outermost one-turn main light emitting unit 110 in the light emitting array 111 is defined as the first light emitting unit 112 and the region located is defined as the edge region 151, and the outermost one-turn main light emitting unit 110 is defined as the second light emitting unit 113 and the region located is defined as the middle region 150. The first light emitting unit 112 and the second light emitting unit 113 are substantially the same, and have the same type. However, since the first light emitting unit 112 in the edge region 151 is located in the edge-most region 151, the corresponding light source overlap is weaker than the light source overlap of the second light emitting unit 113 in the middle region 150, and therefore, the present embodiment mainly compensates the light sources of the first light emitting unit 112 in this part. In addition, the present embodiment is mainly based on the light emitting data of the first light emitting unit 112, when the light emitting data of the first light emitting unit 112 is smaller, the auxiliary light emitting unit 120 is not needed for compensation, but when the light emitting data of the first light emitting unit 112 is larger, the luminance of the first light emitting unit 112 is different from that of the second light emitting unit 113, and the auxiliary light emitting unit 120 is needed for compensation.

In this embodiment, the light emitting data of the first light emitting unit 112, such as gray scale data, can be referred to, and whether the first light emitting unit 112 needs to be compensated is determined according to the gray scale data. When the gray scale data of the main light emitting unit 110 is low, the light source superposition effect is weak, and mainly under the condition that the gray scale data of the main light emitting unit 110 is high, the light source superposition effect is more obvious, human eyes can capture the problem of uneven light source, so that in order to save power consumption, compensation is only needed under the condition that the gray scale data is high.

Specifically, the first preset value is greater than or equal to 50 gray scales and less than or equal to 78 gray scales.

Specifically, the first preset value is 64 gray levels. In the embodiment, the gray scale data is the conventional 8-bit 2-system gray scale, i.e. 0-255 gray scale, and the auxiliary light emitting unit 120 is driven to compensate the first light emitting unit 112 only when the gray scale data of the first light emitting unit 112 is greater than or equal to 64 gray scales.

In another embodiment, when the light emitting data of the first light emitting unit 112 meets the condition that the light emitting data is greater than or equal to the first preset value, the embodiment further sets a gray scale-voltage driving table, and specifically, the backlight module 20 further includes a gray scale-voltage driving table, where the gray scale-voltage driving table includes a mapping relationship between a plurality of gray scale data and a plurality of driving voltage data, and the light emitting data is gray scale data; the compensation control module receives gray scale data of the light emitting array 111, and when the gray scale data is greater than or equal to a first preset value, the compensation control module controls voltage driving data corresponding to the gray scale data to drive the auxiliary light emitting unit 120 to emit light according to the gray scale-voltage driving table.

Specifically, in the gray scale-voltage driving table, the larger the gray scale data is, the larger the voltage driving data is. In the present embodiment, it is considered that when the gray scale data of the first light emitting unit 112 is greater than the first preset value, different gray scale data still exist, and according to the actual display condition, the higher the luminance of the backlight module 20 is, the larger the corresponding gray scale data is, the more obvious the luminance unevenness between the edge area 151 where the first light emitting unit 112 is located and the middle area 150 where the second light emitting unit 113 is located is. Accordingly, in the gray scale-voltage driving table, when the gray scale data of the first light emitting unit 112 is larger, the voltage driving data of the corresponding auxiliary light emitting unit 120 is larger, so that the compensation of the auxiliary light emitting unit 120 is higher to compensate for the problem that the difference between the first light emitting unit 112 and the second light emitting unit 113 is more obvious when the gray scale data is larger.

Specifically, in the gray scale-voltage driving table, the gray scale data and the voltage driving data are in a curve relationship. In this embodiment, in consideration of the sensitivity of human eyes to light, the gray scale data and the voltage driving data form a curve relationship, and the curve index of this embodiment may be selected with reference to the gamma value of the gamma curve in the display panel 30.

It should be noted that, in the present application, the auxiliary light-emitting unit 120 is controlled, and the reference data thereof may be selected from the light-emitting data of the second light-emitting unit 113 in addition to the light-emitting data of the first light-emitting unit 112, and whether the auxiliary light-emitting unit 120 emits light or not is controlled according to the light-emitting data of the second light-emitting unit 113.

Of course, in an embodiment, the light emitting data of the first light emitting unit 112 and the second light emitting unit 113 may also be selected for comparison. For example, when the light emitting data of the first light emitting unit 112 is larger than the second light emitting data, the auxiliary light emitting unit 120 is not required to compensate; for example, when the light emitting data of the first light emitting unit 112 is smaller than the data of the second light emitting unit 113, the auxiliary light emitting unit 120 is not required to compensate; for example, when the light emitting data of the first light emitting unit 112 is equal to the light emitting data of the second light emitting unit 113 and the light emitting data is greater than the first preset value, the auxiliary light emitting unit 120 is turned on for compensation. The scheme can solve the brightness unevenness to the greatest extent and compensate under the condition that human eyes are most sensitive so as to save power consumption.

FIG. 2 is a schematic diagram of a main lighting unit of the present application, wherein a plurality of the main lighting units 110 are divided into a plurality of independently controlled control partitions, as shown in FIG. 2; the main light-emitting unit 110 includes a light string including a plurality of LED lamps connected in series, the backlight module 20 further includes a display control module 140, and the display control module 140 includes a plurality of control channels for receiving external light-emitting data and controlling the light-emitting of the light strings in the plurality of control partitions according to the light-emitting data.

Fig. 3 is a schematic diagram of the display control module of the present application, and as shown in fig. 3, the display control module 140 includes a control circuit 141, a logic circuit 142 and a power circuit 143, the control circuit 141 is configured to generate a switch for controlling the LED light string of the Mini-LED backlight module 20, the logic circuit 142 is configured to receive light-emitting data sent by an external driving circuit, so as to generate a logic signal of the LED light string, and the power circuit 143 receives a power input voltage and the like sent by the external driving circuit, and generates various required voltage and current according to the brightness requirement of the LED light string.

Specifically, a row or a column of the first light emitting units 112 is respectively disposed around the middle region 150 and in the corresponding edge region 151; a plurality of the auxiliary light emitting units 120 are disposed around the edge region. The embodiment can only compensate the lamp string of the outermost circle. It should be understood that the main light-emitting unit 110 in the present embodiment includes a plurality of LED strings, each of which may be arranged in a single row or multiple rows, but the first light-emitting unit 112 is arranged in a single row or a single row, so as to achieve more accurate light-emitting compensation.

Specifically, the light emitting power of the main light emitting unit 110 is greater than that of the auxiliary light emitting unit 120. The type and size of the auxiliary light emitting unit 120 are smaller than those of the main light emitting unit 110, so as to save cost. Of course, it is also possible to select a string of LED lights identical to the main light unit 110 as the auxiliary light unit 120. It should also be understood here that the control modules used for the auxiliary light emitting unit 120 and the main light emitting unit 110 are different, the auxiliary light emitting unit 120 is controlled by the compensation control module, and the main light emitting unit 110 is controlled by the display control module 140.

Specifically, the display panel 30 adapted to the backlight module 20 is divided into a display area and a non-display area, the plurality of main light emitting units 110 are disposed on the backlight 100 corresponding to the display area, and the plurality of auxiliary light emitting units 120 are disposed on the backlight 100 corresponding to the non-display area. That is, the auxiliary light emitting unit 120 in the present embodiment is not used for display, and is used only for light emission compensation of the first light emitting unit 112.

Specifically, the auxiliary light-emitting unit 120 also includes a plurality of LED strings, each of which includes a plurality of LED lamps, and in one embodiment, each of the LED strings may be arranged in a single row or a single column. I.e. only one row or column of strings is arranged around the first light-emitting unit 112 for compensation.

The backlight module 20 of the present application is a Mini-LED backlight module 20, and the Mini-LED may only emit white light, and is used as a backlight source to provide backlight for the liquid crystal display panel 30, so that the liquid crystal display panel 30 can display. Of course, the solution of the present application is not limited to the Mini-LED backlight module 20, and Micro-LEDs are also applicable. That is, the plurality of main light emitting units 110 in the present embodiment are configured as the main light emitting units 110 having RGB colors, and each three main light emitting units 110 of RGB colors constitute one pixel unit. The main light emitting unit 110 of the edge region 151 of the Micro-LED is also subjected to light emission compensation.

Fig. 4 is a schematic view of a display device of the present application, and as shown in fig. 4, the present application further discloses a display device, where the display device 10 includes a display panel 30 and the backlight module 20, and the backlight module 20 provides a backlight source for the display panel 30.

It should be noted that the inventive concept of the present application can form many embodiments, but the present application has a limited space and cannot be listed one by one, so that, on the premise of no conflict, any combination between the above-described embodiments or technical features can form a new embodiment, and after the embodiments or technical features are combined, the original technical effect will be enhanced.

The foregoing is a further detailed description of the present application in connection with specific alternative embodiments and it is not intended that the present application be limited to these specific details. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.

Claims (10)

1. A backlight module comprises a backlight plate, and is characterized in that a plurality of main light-emitting units and a plurality of auxiliary light-emitting units are arranged on the backlight plate,

a plurality of main light-emitting unit arrays are arranged to form a light-emitting array, and a plurality of auxiliary light-emitting units are arranged around the light-emitting array;

the backlight module further comprises a compensation control module, the compensation control module receives the light emitting data of the light emitting array, and when the light emitting data is larger than or equal to a first preset value, the auxiliary light emitting unit is controlled to emit light.

2. The backlight module according to claim 1, wherein the light emitting array comprises a middle region and an edge region, the edge region is disposed around the middle region, the main light emitting unit disposed corresponding to the edge region is a first light emitting unit, and the main light emitting unit disposed corresponding to the middle region is a second light emitting unit;

the control module receives the light emitting data of the first light emitting unit, controls the auxiliary light emitting unit to emit light when the light emitting data is larger than or equal to a first preset value, and controls the auxiliary light emitting unit not to emit light when the light emitting data is smaller than the first preset value.

3. The backlight module according to claim 2, wherein a row or a column of the first light-emitting units is disposed around the middle region and corresponding to the edge region; a plurality of the auxiliary light emitting units are disposed around the edge region.

4. The backlight module as claimed in claim 1, wherein the main light-emitting unit has a light-emitting power greater than that of the auxiliary light-emitting unit.

5. The backlight module according to claim 1, further comprising a gray scale-voltage driving table, wherein the gray scale-voltage driving table comprises a mapping relationship between a plurality of gray scale data and a plurality of driving voltage data, and the light emitting data is gray scale data;

and the compensation control module receives gray scale data of the light emitting array, and controls voltage driving data corresponding to the gray scale data to drive the auxiliary light emitting unit to emit light according to the gray scale-voltage driving table when the gray scale data is greater than or equal to a first preset value.

6. The backlight module as claimed in claim 5, wherein the first predetermined value is greater than or equal to 50 gray scales and less than or equal to 78 gray scales; in the gray scale-voltage driving table, the larger the gray scale data is, the larger the voltage driving data is.

7. The backlight module as claimed in claim 6, wherein the first predetermined value is 64 gray levels, and the gray level data and the voltage driving data are in a curve relationship in the gray level-voltage driving table.

8. The backlight module according to claim 1, wherein the plurality of main light emitting units are divided into a plurality of independently controlled control partitions;

the main light-emitting unit comprises a light string which comprises a plurality of LED lamps connected in series,

the backlight module further comprises a display control module, wherein the display control module comprises a plurality of control channels and is used for receiving external light-emitting data and respectively controlling the light strings of the control subareas to emit light according to the light-emitting data.

9. A display device comprising a display panel and the backlight module of any one of claims 1-8, wherein the backlight module provides a backlight source for the display panel.

10. The display device according to claim 9, wherein the display panel includes a display region and a non-display region, a plurality of the main light emitting units are disposed on the backlight plate corresponding to the display region, and a plurality of the auxiliary light emitting units are disposed on the backlight plate corresponding to the non-display region.

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