WO2021109576A1

WO2021109576A1 - Light-emitting circuit, backlight module and display

Info

Publication number: WO2021109576A1
Application number: PCT/CN2020/101618
Authority: WO
Inventors: 何聪辉
Original assignee: 广州视源电子科技股份有限公司; 广州视睿电子科技有限公司
Priority date: 2019-12-06
Filing date: 2020-07-13
Publication date: 2021-06-10
Also published as: CN211181603U

Abstract

A light-emitting circuit, a backlight module and a display. The light-emitting circuit comprises: a first branch (10) and a second branch (20). The first branch (10) comprises a plurality of first light-emitting elements (11). The second branch (20) comprises a plurality of second light-emitting elements (21). A working current of the first branch (10) is less than that of the second branch (20), the plurality of first light-emitting elements (11) and the plurality of second light-emitting elements (21) form a light-emitting region, the plurality of first light-emitting elements (11) are located in the middle of the light-emitting region, and the plurality of second light-emitting elements (21) are located at edges of the light-emitting region.

Description

Light-emitting circuit, backlight module and display

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201922176273.2, and the invention title is "light-emitting circuit, backlight module and display" on December 6, 2019. The entire content is incorporated into this application by reference. in.

Technical field

This application relates to the field of display technology, and in particular to a light-emitting circuit, a backlight module having the light-emitting circuit, and a display having the backlight module.

Background technique

The description of the background technology in this application belongs to the related technology related to this application. It is only used to illustrate and facilitate the understanding of the application content of this application. It should not be construed as the applicant expressly believes or presumes that the applicant believes that this application is the first application for this application. Existing technology on the filing date.

With the rapid development of flat display technology, liquid crystal displays (LCD) have been widely used in various information and communication consumer products due to their small size, high image quality, no radiation, and low driving voltage. Since the liquid crystal display panel in the LCD does not emit light by itself, it is necessary to provide a backlight module as a backlight source on the back of the liquid crystal display panel to display images normally. Light-emitting diodes (LEDs) have the characteristics of low energy consumption, small size, long life, low temperature rise, etc., and are usually used as the backlight source of the liquid crystal display device in the form of an LED backlight module.

In the existing LED backlight drive circuit design, the brightness of the LED lamps of different LED lamp groups is different, which causes the backlight brightness to appear uneven, which ultimately affects the display effect of the module screen.

Summary of the invention

The light-emitting circuit provided by the embodiment of the first aspect of the present application, applied to a backlight module, includes: a first branch, the first branch including a plurality of first light-emitting elements; and a second branch, the second branch The branch includes a plurality of second light-emitting elements; wherein, the operating current of the first branch is smaller than the operating current of the second branch, and a plurality of the first light-emitting elements and a plurality of the second light-emitting elements constitute In the light-emitting area, a plurality of the first light-emitting elements are located in the middle of the light-emitting area, and a plurality of the second light-emitting elements are located at the edge of the light-emitting area.

In the light-emitting circuit provided by the present application, due to the superimposition of the first light-emitting element and the light-emitting elements on both sides of the adjacent sides, the brightness in the middle of the light-emitting area is higher than that of the first light-emitting element, and the working current of the second branch is greater than that of the first branch. The working current makes the brightness of the second light-emitting element located at the edge of the light-emitting area greater than the brightness of the first light-emitting element located in the middle of the light-emitting area, so that the brightness of the edge of the light-emitting area is the same or approximately the same as the brightness of the middle of the light-emitting area, thereby ensuring the backlight The uniformity of the module brightness improves the comfort of the product.

Optionally, the first light-emitting element is a light-emitting diode, and/or the second light-emitting element is a light-emitting diode; the output end of the first branch is connected to the output end of the second branch.

In this embodiment, the first branch and the second branch share one output end, which reduces the layout of one line, thereby increasing the space for the line; the light-emitting diode has high light efficiency, low power consumption, long life, and easy Advantages of control, maintenance-free, safety and environmental protection.

Optionally, the first branch includes a plurality of first sub-circuits, and the second branch includes a plurality of second sub-circuits.

In this embodiment, the first branch is divided into a plurality of first sub-circuits. When the first light-emitting element has a problem, only the sub-circuit where it is located needs to be replaced, which is convenient and quick, improves the inspection speed of the product, and thus improves The comfort of use of the product further improves the market competitiveness of the product. In the same way, the second branch is divided into multiple second sub-circuits. When the second light-emitting element has a problem, only the sub-circuit where it is located needs to be replaced, which is convenient and quick, improves the maintenance speed of the product, and improves the use of the product. Comfort, which in turn improves the market competitiveness of the product.

Optionally, one said first sub-circuit and one said second sub-circuit are integrated on one circuit board.

In this embodiment, the first sub-circuit and the second sub-circuit are integrated on a circuit board to form a light bar, and multiple light bars are spliced to form the light source of the backlight module. When there is a problem with the second light-emitting element, only the circuit board on which it is located needs to be replaced, which is convenient and quick, and improves the maintenance speed of the product, thereby improving the comfort of use of the product, and further improving the market competitiveness of the product.

Optionally, the circuit board is elongated, the second sub-circuit is serially connected to the second light-emitting elements located at both ends of the elongated circuit board, and the first sub-circuit is serially connected to the elongated circuit board. -Shaped first light-emitting element in the middle of the circuit board.

In this embodiment, the brightness of the second light-emitting element located at both ends of the strip-shaped circuit board is greater than the brightness of the first light-emitting element located in the middle of the strip-shaped circuit board, and the brightness of the edge of the light-emitting area is equal to that of the middle of the light-emitting area. The brightness is the same or approximately the same, thereby ensuring the uniformity of the brightness of the backlight module and improving the comfort of the product.

Optionally, the first sub-circuit is integrated on a first branch board, and the second sub-circuit is integrated on a second branch board.

In this embodiment, the light-emitting circuit only includes two branches, the structure is simple, and the production is convenient, thereby improving the production efficiency of the product, thereby reducing the production and manufacturing cost of the product, and increasing the market competitiveness of the product.

Optionally, the first light-emitting elements of the first branch are connected in series with each other, and the second light-emitting elements of the second branch are connected in series with each other.

In this embodiment, in the first branch, the currents of the first light-emitting elements connected in series are the same, which ensures that the brightness of each first light-emitting element is the same; in the same way, in the second branch, the first light-emitting elements connected in series have the same current. The currents of the two light-emitting elements are the same, which ensures that the brightness of each second light-emitting element is the same, thereby ensuring the uniformity of the brightness of the backlight module, and improving the comfort of use of the product.

An embodiment of the second aspect of the present application provides a backlight module including any one of the above-mentioned light-emitting circuits.

The backlight module provided in the second aspect of the application has uniform light emission and uniform brightness, which ensures the comfort of use of the product.

An embodiment of the third aspect of the present application provides a display including the above-mentioned backlight module.

The display provided in the third aspect of the present application has uniform display and ensures the comfort of use of the product.

Optionally, the display further includes: a first sensor that detects optical information at the edge of the light-emitting area of the backlight module in real time and sends a first electrical signal; a second sensor that detects in real time The optical information inside the light-emitting area of the backlight module, and send a second electrical signal; and a controller, the controller receives the first electrical signal and the second electrical signal, and based on the first electrical signal The signal and the second electrical signal adjust the current of the first branch or the second branch of the backlight module.

An embodiment of the fourth aspect of the present application provides a display, including a light-emitting circuit, the light-emitting circuit includes a first branch and a second branch; the first branch includes a plurality of first light-emitting elements, the The second branch includes a plurality of second light-emitting elements; wherein, a plurality of the first light-emitting elements and a plurality of the second light-emitting elements constitute a light-emitting area, and the plurality of first light-emitting elements are located in the middle of the light-emitting area A plurality of the second light-emitting elements are located at the edge of the light-emitting area; the display further includes: a first sensor that detects optical information at the edge of the light-emitting area in real time and sends a first electrical signal; A second sensor, which detects the optical information inside the light-emitting area in real time and sends a second electrical signal; and a controller, which receives the first electrical signal and the second electrical signal, And adjust the current of the first branch or the second branch according to the first electrical signal and the second electrical signal.

In the display provided by the present application, due to the superimposition of the first light-emitting element of the light-emitting circuit and the light-emitting elements on both sides of the adjacent light-emitting circuit, the brightness of the middle part of the light-emitting area is higher than that of the first light-emitting element, and the working current of the second branch is greater than that of the first light-emitting element. The working current of the branch makes the brightness of the second light-emitting element located at the edge of the light-emitting area greater than the brightness of the first light-emitting element located in the middle of the light-emitting area, so that the brightness of the edge of the light-emitting area is the same or approximately the same as the brightness of the middle of the light-emitting area, so as to ensure The uniformity of the brightness of the display is ensured, thereby ensuring the uniformity of the brightness of the display, and the use comfort of the product is improved.

The additional aspects and advantages of the present application will become apparent in the following description, or be understood through the practice of the present application.

Description of the drawings

The above and/or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

FIG. 1 is a schematic structural diagram of an embodiment of the light-emitting circuit according to the present application;

2 is a schematic structural diagram of another embodiment of the light-emitting circuit of the present application;

FIG. 3 is a schematic structural diagram of another embodiment of the light-emitting circuit according to the present application;

FIG. 4 is a structural block diagram of an embodiment of the display according to the present application.

Among them, the corresponding relationship between the reference signs and component names in Figures 1 to 4 is:

10. The first branch; 11. The first light-emitting element; 12, the first sub-circuit; 20, the second branch; 21, the second light-emitting element; 22, the second sub-circuit; 31, the circuit board; 32, the first A branch board; 33, the second branch board; 40, the first sensor; 50, the second sensor; 60, the controller; 100, the display.

Detailed ways

In order to be able to understand the above objectives, features and advantages of the application more clearly, the application will be further described in detail below with reference to the accompanying drawings and specific implementations. It should be noted that the embodiments of the application and the features in the embodiments can be combined with each other if there is no conflict.

In the following description, many specific details are set forth in order to fully understand this application. However, this application can also be implemented in other ways different from those described here. Therefore, the scope of protection of this application is not covered by the specific details disclosed below. Limitations of the embodiment.

The following discussion provides several embodiments of the application. Although each embodiment represents a single combination of the application, different embodiments of the present application can be replaced or combined. Therefore, the present application may also be considered to include all possible combinations of the same and/or different embodiments described. Therefore, if one embodiment includes A, B, C, and another embodiment includes a combination of B and D, then this application should also be considered as including all other possible combinations of one or more of A, B, C, and D The embodiment, although the embodiment may not be clearly written in the following content.

As shown in FIG. 1, an embodiment of the first aspect of the present application provides a light-emitting circuit applied to a backlight module including: a first branch 10 and a second branch 20.

The first branch 10 includes a plurality of first light-emitting elements 11. (In the following embodiment, the X-th branch includes multiple sub-circuits, and multiple sub-circuits are connected in parallel, so the light-emitting elements of each branch cannot be completely regarded as "connected in series")

The second branch 20 includes a plurality of second light-emitting elements 21.

Wherein, the working current of the first branch 10 is smaller than the working current of the second branch 20, a plurality of first light-emitting elements 11 and a plurality of second light-emitting elements 21 constitute a light-emitting area, and a plurality of first light-emitting elements 11 are located in the light-emitting area. In the middle, a plurality of second light-emitting elements 21 are located at the edge of the light-emitting area.

In the light-emitting circuit provided by the present application, due to the superimposition of the first light-emitting element 11 and the light-emitting elements on both sides of the adjacent sides, the brightness of the middle part of the light-emitting area is higher than that of the first light-emitting element 11, and the working current of the second branch 20 is greater than The working current of the first branch 10 makes the brightness of the second light-emitting element 21 at the edge of the light-emitting area greater than that of the first light-emitting element 11 in the light-emitting area, so that the brightness at the edge of the light-emitting area is the same as the brightness of the middle of the light-emitting area. Approximately the same, thereby ensuring the uniformity of the brightness of the backlight module, and improving the comfort of the product.

As shown in FIG. 2, in an embodiment of the present application, the first light-emitting elements 11 of the first branch 10 are connected in series with each other, and the second light-emitting elements 21 of the second branch 20 are connected in series with each other.

In this embodiment, in the first branch, the current of the first light-emitting elements connected in series is the same, which ensures that the brightness of each first light-emitting element is the same; similarly, in the second branch, the first light-emitting elements connected in series have the same current. The currents of the two light-emitting elements are the same, which ensures that the brightness of each second light-emitting element is the same, thereby ensuring the uniformity of the brightness of the backlight module, and improving the comfort of use of the product.

As shown in FIG. 2, in an embodiment of the present application, the output end of the first branch 10 is connected to the output end of the second branch 20.

In this embodiment, the first branch 10 and the second branch 20 share one output end, which reduces the layout of one line, thereby increasing the space for arranging lines.

As shown in FIG. 2, in an embodiment of the present application, the first branch 10 includes a plurality of first sub-circuits 12, and the first light-emitting elements 11 on each first sub-circuit 12 are connected in series with each other; the second branch 20 includes a plurality of second sub-circuits 22, and the second light-emitting elements 21 on each second sub-circuit 22 are connected in series.

In this embodiment, the first branch 10 is divided into a plurality of first sub-circuits 12, when the first light-emitting element 11 has a problem, only the sub-circuit where it is located needs to be replaced, which is convenient and quick, and improves the inspection speed of the product. Thus, the comfort of the product is improved, and the market competitiveness of the product is improved. In the same way, the second branch 20 is divided into a plurality of second sub-circuits 22. When the second light-emitting element 21 has a problem, only the sub-circuit where it is located needs to be replaced, which is convenient and quick, improves the inspection speed of the product, and thus improves The comfort of use of the product further improves the market competitiveness of the product.

As shown in FIG. 2, in an embodiment of the present application, a first sub-circuit 12 and a second sub-circuit 22 are integrated on a circuit board 31, and the first light-emitting element 11 and the second light-emitting element 21 are arranged on the circuit board.板31上。 Board 31.

In this embodiment, the first sub-circuit 12 and the second sub-circuit 22 are integrated on a circuit board 31 to form a light bar, and multiple light bars are spliced to form the light source of the backlight module. When there is a problem with the first light-emitting element 11 and the second light-emitting element 21, only the circuit board 31 on which they are located needs to be replaced, which is convenient and quick, improves the maintenance speed of the product, thereby improves the comfort of the product, and further improves the market competition of the product force.

As shown in FIG. 2, in an optional embodiment of the present application, the circuit board 31 is elongated, the second light-emitting elements 21 are located at both ends of the circuit board 31, and the first light-emitting elements 11 are located on the circuit board. The middle of the strip 31; that is, the second sub-circuit 22 is serially connected to the second light-emitting elements 21 located at both ends of the strip-shaped circuit board 31, and the first sub-circuit 12 is serially connected to the first light-emitting element located in the middle of the strip-shaped circuit board 31 11.

As shown in FIG. 3, in an embodiment of the present application, the first sub-circuit 12 (not in FIG. 3) is integrated on the first branch board 32 (not in FIG. 3), and the second sub-circuit 22 (not in FIG. 3) Integrated on the second branch board 33.

In an embodiment of the present application, the first light-emitting element is a light-emitting diode, and/or, the second light-emitting element is a light-emitting diode.

In this embodiment, the light-emitting diode has the advantages of high light efficiency, low power consumption, long life, easy control, maintenance-free, safety and environmental protection.

The backlight module provided by the embodiment of the second aspect of the present application includes any one of the above-mentioned light-emitting circuits.

The display 100 provided by the embodiment of the third aspect of the present application includes the above-mentioned backlight module.

The display 100 provided in the third aspect of the present application has a uniform display, which ensures the comfort of the product.

As shown in FIG. 4, in an embodiment of the present application, the display 100 further includes: a first sensor 40, a second sensor 50, and a controller 60.

The first sensor 40 detects the optical information at the edge of the light-emitting area of the backlight module in real time, and sends a first electrical signal.

The second sensor 50 detects the optical information inside the light-emitting area of the backlight module in real time, and sends a second electrical signal.

The controller 60 receives the first electrical signal and the second electrical signal, and adjusts the current of the first branch 10 or the second branch 20 of the backlight module according to the first electrical signal and the second electrical signal.

In this embodiment, the optical information at the edge of the light-emitting area and the optical information at the middle of the light-emitting area are monitored in real time. When the optical information at the edge of the light-emitting area is different from the optical information at the edge of the light-emitting area, the controller 60 adjusts the first branch 10 or The current of the two branches 20 makes the optical information at the edge of the light-emitting area the same as the optical information at the edge of the light-emitting area to ensure the uniformity of the brightness of the backlight module. In addition, the optical information includes the intensity of light, the brightness of light, and so on.

The display provided by the embodiment of the fourth aspect of the present application includes a light-emitting circuit. The light-emitting circuit includes a first branch and a second branch; the first branch includes a plurality of first light-emitting elements, and the second branch includes a plurality of first branches. Two light-emitting elements; wherein a plurality of first light-emitting elements and a plurality of second light-emitting elements constitute a light-emitting area, a plurality of first light-emitting elements are located in the middle of the light-emitting area, and a plurality of second light-emitting elements are located at the edge of the light-emitting area.

In an embodiment of the present application, the display further includes: a first sensor, the first sensor detects the optical information at the edge of the light-emitting area in real time, and sends the first electrical signal; the second sensor, the second sensor detects the optical information inside the light-emitting area in real time Information and send a second electrical signal; and a controller, which receives the first electrical signal and the second electrical signal, and adjusts the current of the first branch or the second branch according to the first electrical signal and the second electrical signal.

Obviously, the above-mentioned embodiments are merely examples for clear description, and are not intended to limit the implementation manners. For those skilled in the art, other changes or changes in different forms can be made on the basis of the above description. No need to be exhaustive here. The obvious changes or changes derived from this are still within the scope of protection created by this application.

In this application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more than two, unless otherwise stated. Clearly defined. In this application, terms such as “connected” and “fixed” should be understood in a broad sense. For example, “connected” can be connected by wires or by signals. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in this application can be understood according to specific circumstances.

The above are only specific implementations of the application, so that those skilled in the art can understand or implement the application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the application, concept or scope. Therefore, this application will not be limited to the embodiments shown in this document, but conform to the widest scope consistent with the principles and novel features disclosed in this document.

The above descriptions are only preferred embodiments of the application, and are not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

A light-emitting circuit applied to a backlight module includes:

A first branch, the first branch includes a plurality of first light-emitting elements; and

A second branch, the second branch including a plurality of second light-emitting elements;

Wherein, the operating current of the first branch is smaller than the operating current of the second branch, a plurality of the first light-emitting elements and a plurality of the second light-emitting elements constitute a light-emitting area, and a plurality of the first light-emitting elements The element is located in the middle of the light-emitting area, and a plurality of the second light-emitting elements are located at the edge of the light-emitting area.
The light-emitting circuit according to claim 1, wherein:

The first light-emitting element is a light-emitting diode, and/or the second light-emitting element is a light-emitting diode; the output end of the first branch is connected to the output end of the second branch.
The light-emitting circuit according to claim 1, wherein:

The first branch includes a plurality of first sub-circuits, and the second branch includes a plurality of second sub-circuits.
The light-emitting circuit according to claim 3, wherein:

A said first sub-circuit and a said second sub-circuit are integrated on a circuit board.
The light-emitting circuit according to claim 4, wherein:

The circuit board is elongated, the second sub-circuit is serially connected to the second light-emitting elements located at both ends of the elongated circuit board, and the first sub-circuit is serially connected to the elongated The first light-emitting element in the middle of the circuit board.
The light-emitting circuit according to claim 3, wherein:

The first sub-circuit is integrated on the first branch board, and the second sub-circuit is integrated on the second branch board.
The light-emitting circuit according to claim 1, wherein:

The first light-emitting elements of the first branch are connected in series with each other, and the second light-emitting elements of the second branch are connected in series with each other.
A backlight module comprising the light-emitting circuit according to any one of claims 1 to 7.
A display comprising the backlight module according to claim 8.
The display according to claim 9, further comprising:

A first sensor, the first sensor detects the optical information at the edge of the light-emitting area of the backlight module in real time, and sends a first electrical signal;

A second sensor, which detects the optical information inside the light-emitting area of the backlight module in real time, and sends a second electrical signal; and

The controller receives the first electrical signal and the second electrical signal, and adjusts the first branch or the second branch of the backlight module according to the first electrical signal and the second electrical signal. The current of the two branches.
A display includes a light-emitting circuit, the light-emitting circuit includes a first branch and a second branch; the first branch includes a plurality of first light-emitting elements, and the second branch includes a plurality of second light-emitting elements Element; wherein a plurality of the first light-emitting elements and a plurality of the second light-emitting elements constitute a light-emitting area, a plurality of the first light-emitting elements are located in the middle of the light-emitting area, and a plurality of the second light-emitting elements are located The edge of the light-emitting area;

The display also includes:

A first sensor, the first sensor detects the optical information at the edge of the light-emitting area in real time, and sends a first electrical signal;

A second sensor, which detects the optical information inside the light-emitting area in real time and sends a second electrical signal; and

The controller receives the first electrical signal and the second electrical signal, and adjusts the power of the first branch or the second branch according to the first electrical signal and the second electrical signal. Current.