CN217112980U

CN217112980U - Backlight module and display device

Info

Publication number: CN217112980U
Application number: CN202220538479.4U
Authority: CN
Inventors: 庄少校; 杨磊; 黄芬; 樊劼
Original assignee: Truly Opto Electronics Ltd
Current assignee: Truly Opto Electronics Ltd
Priority date: 2022-03-11
Filing date: 2022-03-11
Publication date: 2022-08-02
Anticipated expiration: 2032-03-11

Abstract

The utility model discloses a backlight module and a display device, wherein the backlight module comprises a light guide plate and a LED light bar; the light guide plate comprises a light incident surface, and the LED light bars are arranged on one side of the light incident surface in parallel; the LED lamp strip comprises a substrate and a plurality of LEDs, and further comprises a rotatable LED, the rotatable LED is connected with a driving device through a rotating shaft, and the rotating shaft is perpendicular to the emergent light direction of the LED lamp strip. Through the utility model discloses, when the user only wanted display panel's subregion to show, make rotatable LED rotatory to a certain specific angle through drive arrangement to light this rotatable LED through solitary control scheme, realize that liquid crystal display only subregion carries out the effect that shows, specially adapted cell-phone or other equipment need the condition that screen part region shows at night.

Description

Backlight module and display device

Technical Field

The utility model relates to a display device technical field especially relates to a backlight module and display device.

Background

An LCD Display, which is a Liquid Crystal Display, is a short name for Liquid Crystal Display, and belongs to a flat panel Display. In the display module of the LCD display, the display module generally includes a display panel for displaying and a backlight module for providing light, and the backlight module is fixed on one side of the display panel to support and protect the display panel.

With the rapid development of light source technology in backlight modules, LEDs (light emitting diodes) gradually replace Cold Cathode Fluorescent Lamps (CCFLs) due to their characteristics of low energy consumption, small size, long life, low temperature rise, etc., and are used as backlight sources of liquid crystal display devices in the form of LED backlight modules.

Generally, the backlight module is roughly divided into two ways: direct type and edge type. More specifically, the direct type LED backlight module has simple process, does not need a light guide plate, and the light emitted from the LED is reflected by the bottom surface and the side surface and then is uniformly emitted through the diffusion plate and the optical module on the surface. The side-light type LED backlight module comprises a light guide plate and an LED lamp bar, wherein the LED lamp bar is arranged on the side edge of the light guide plate which is specially designed, light emitted from an LED irradiates the light incident side of the light guide plate, and linear light beams with high uniformity are formed after the light guide plate is processed.

Compared with a direct type LED backlight module, the side-light type LED backlight module can reduce the cost by using fewer LED crystal grains, and does not need to be arranged behind an LED liquid crystal panel, so that the overall thickness of a screen is reduced. Therefore, the side-light type LED backlight module is commonly used by various manufacturers.

However, once the existing edge-lit LED backlight module is designed and fixed, if the screen needs to be lit, all LEDs need to be lit even if only a partial area of the screen needs to be displayed, and it is impossible to control only some LEDs to be lit, which causes a waste of electric power.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a backlight module and display device for solve the unable control of side light type backlight unit among the prior art its technical problem who only lightens LCD screen part region.

In order to solve the above problem, the utility model adopts the following technical scheme:

on one hand, the backlight module comprises a light guide plate and an LED light bar;

the light guide plate comprises a light incident surface, and the LED light bars are arranged on one side of the light incident surface in parallel;

the LED lamp strip comprises a substrate and a plurality of LEDs, and the LEDs are arranged at intervals along the length direction of the substrate;

the LED lamp strip comprises a rotatable LED, the rotatable LED is connected with the driving device through a rotating shaft, and the rotating shaft is perpendicular to the emergent light direction of the LED lamp strip.

As a preferred technical scheme, the driving device is arranged on one side of the rotatable LED, which is deviated from the emergent light direction; the driving device comprises a micro motor and a transmission shaft, and the transmission shaft is in transmission fit with the rotating shaft gear.

As a preferred technical scheme, the rotating shaft is fixedly connected to the middle part of the rotatable LED.

As a preferred technical scheme, the rotation angle of the rotatable LED is clockwise/anticlockwise rotated by 0-90 degrees.

As a preferred technical scheme, the rotatable LED can be arranged at any position of the LED lamp strip.

As a preferred technical scheme, the rotatable LED is arranged in the center of the LED lamp strip.

As a preferred technical scheme, the rotatable LED is arranged at the end part of the LED lamp strip.

Preferably, the LED light bar comprises at least two rotatable LEDs.

As a preferred technical scheme, other LEDs in the LED lamp strip are connected in series and then connected in parallel with the rotatable LED.

In another aspect, a display device is provided, which includes the backlight module as described above.

The utility model discloses a technical scheme can reach following beneficial effect:

(1) the application provides a backlight module and a display device, wherein the structure of the backlight module mainly comprises a light guide plate and an LED light bar, a rotatable LED is arranged in the LED light bar, a rotating shaft of the rotatable LED is vertical to the emergent light direction of the rotatable LED, and a control circuit of the rotatable LED is connected with control circuits of other LEDs in parallel; when a user only wants to display a partial area of the display panel, the rotatable LED is rotated to a certain specific angle through the driving device, and the rotatable LED is lightened through a separate control circuit, so that the effect that the liquid crystal display only displays the partial area is achieved, and the liquid crystal display is particularly suitable for the condition that a mobile phone or other equipment needs to display the partial area of the screen at night.

(2) In a preferred embodiment of the present invention, the rotatable LED is disposed in the middle of the LED light bar, and the rotation angle thereof is clockwise/counterclockwise 0-90 degrees, so that when the rotatable LED is rotated to a specific angle, local lighting of any area of the liquid crystal display panel can be satisfied.

(3) In another preferred embodiment of the present application, a plurality of rotatable LEDs may be disposed, and are respectively disposed at a plurality of positions of the LED light bar at intervals, each rotatable LED is only responsible for lighting a display panel of a certain area, and the plurality of rotatable LEDs may achieve better brightness and display effect when the partial areas of the liquid crystal display screen are lighted.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below to form a part of the present invention, and the exemplary embodiments and the description thereof of the present invention explain the present invention and do not form an improper limitation to the present invention. In the drawings:

fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present invention disclosed in embodiment 1;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a schematic view of the rotatable LED shown in FIG. 2 after rotating a certain angle;

fig. 4 is a perspective view of fig. 2.

The following reference signs are specifically included:

the LED light guide plate comprises a light guide plate 1, an LED light bar 2, a substrate 21, an LED22, a rotatable LED23, a rotating shaft 3, a gear 4, a transmission shaft 5, a micro motor 6 and an FPC 7.

Detailed Description

To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. In the description of the present invention, it is noted that the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to solve the problems in the prior art, embodiments of the present application mainly provide a backlight module, which includes a light guide plate and an LED light bar; the light guide plate comprises a light incident surface, and the LED light bars are arranged on one side of the light incident surface in parallel; the LED lamp strip comprises a substrate and a plurality of LEDs, and the LEDs are arranged at intervals along the length direction of the substrate; the LED lamp strip comprises a rotatable LED, the rotatable LED is connected with the driving device through a rotating shaft, and the rotating shaft is perpendicular to the emergent light direction of the LED lamp strip.

Example 1

The existing liquid crystal display mainly comprises a display panel and a backlight module, wherein the backlight module mostly adopts a side-light type backlight module, LEDs 22 on an LED light bar 2 are connected in series, and when the display panel needs to be lightened, LEDs 22 on the LED light bar 2 are all turned on at one time; when the user only desires to display a partial area of the display panel, the user cannot control a part of the LEDs of the LED light bar 2 to be lit, thereby wasting power. In order to solve the above problem, this embodiment 1 provides a backlight module, in the LED light bar 2, a rotatable LED23 is provided, the rotatable LED23 is turned to a certain angle by a driving device, and the rotatable LED23 is turned on by a separate control circuit, so that the effect that only a partial area of the liquid crystal display screen displays is achieved.

Referring to fig. 1 to 4, in a preferred embodiment, an edge-lit backlight module is provided, which includes a light guide plate 1 and an LED light bar 2 on one side thereof; the surface of the light guide plate 1 opposite to the LED light bar 2 is a light incident surface, and the LED light bar 2 is arranged in parallel with the light incident surface of the light guide plate 1; in the LED light bar 2, a plurality of LEDs 22 are provided at intervals along the longitudinal direction of the substrate 21.

As shown in fig. 2 and 4, preferably, a rotatable LED23 is disposed in the LED light bar 2, and the rotation axis 3 of the rotatable LED23 is perpendicular to the light emitting direction of the LED light bar 2, that is, the rotation direction of the rotatable LED23 is parallel to the light emitting surface of the light guide plate 1; the rotary shaft 3 is connected to a drive device which is mounted on the side of the rotatable LED23 facing away from the direction of the outgoing light.

Preferably, the rotating shaft 3 is fixed to the middle of the rotatable LED23 to ensure that the rotatable LED23 can rotate both clockwise and counterclockwise and the light emitted to the light guide plate 1 can be balanced after rotating clockwise or counterclockwise in the opposite direction; preferably; the lower end of the rotating shaft 3 is longer than the rotatable LED23, the lower end of the rotating shaft is fixedly connected with a gear 4, and the driving device is in transmission fit with the rotating shaft 3 through the gear. In a preferred embodiment, the driving device is a micro motor 6 and a transmission shaft 5, and a gear 4 is also provided at the end of the transmission shaft 5, when the micro motor 6 is started, the transmission shaft 5 rotates, and the torque is transmitted to the rotating shaft 3 through the gear 4.

In a preferred embodiment, in order to control the volume of the backlight module, the circuit of the driving device is disposed in the FPC7 of the LED light bar 2, and the FPC7 is electrically connected to the main control device.

Alternatively, the rotatable LED23 can be disposed at any position of the LED light bar 2, such as at the end, center, or other position of the LED light bar 2; preferably, the rotatable LED23 is disposed in the middle of the LED light bar 2, as shown in fig. 2, to ensure that the rotatable LED23 applies the same luminous flux change to both the left and right sides of the light guide plate 1 after rotating clockwise or counterclockwise.

Preferably, the angle of rotation of the rotatable LED23 is 0-90 degrees clockwise/counterclockwise; more preferably, the rotation angle is clockwise/anticlockwise rotated by 0-45 degrees; most preferably, the rotation angle is 0-30 clockwise/counterclockwise to ensure that the rotatable LED23 still provides sufficient illumination intensity to the display panel when rotated to the maximum angle.

Preferably, in the LED light bar 2, in addition to the rotatable LED23, the other LEDs 22 are connected in series and then connected in parallel with the rotatable LED23 to ensure that the rotatable LED23 can be individually turned on and illuminate designated areas of the display panel as it rotates.

Specifically, in the above embodiments, those skilled in the art can understand that the size of the light guide plate 1 and the LED light bar 2 and the number of the LEDs 22 can be freely determined without departing from the scope of the present invention, and further details thereof are not repeated herein.

In this embodiment, the working process of the backlight module is as follows:

the backlight module and a display panel of a mobile phone, an intelligent watch or other display equipment are assembled into a liquid crystal display screen, taking the mobile phone liquid crystal display screen as an example, when the user needs to light the screen at night for viewing time or other message pushing, the whole screen is not required to be bright at the moment, but only the time display or message display area is required to be lightened, at the moment, the rotatable LED23 is turned on and lightened under the control of the mobile phone mainboard, wherein the rotatable LED23 is disposed in the middle of the LED light bar 2, if the set time or other information is displayed in the middle of the display panel, the rotatable LED23 is only lighted to prevent the rotation, if the set time or other information is displayed in other positions of the display panel, such as the upper left corner, the rotatable LED23 is turned on and at the same time, it is controlled to rotate counterclockwise by a certain angle to achieve the effect that only the upper left corner of the lcd is displayed, as shown in fig. 3.

Example 2

In the present embodiment, a side-light type backlight module is provided, which includes a light guide plate 1 and an LED light bar 2 on one side thereof; the LED lamp strip 2 is arranged in parallel with the light incident surface of the light guide plate 1; in the LED light bar 2, a plurality of LEDs 22 are provided at intervals along the longitudinal direction of the substrate 21. Unlike embodiment 1, in the present embodiment, the LED light bar 2 is provided with two or several rotatable LEDs 23, and the plurality of rotatable LEDs 23 may be arranged at intervals or in series.

In a preferred embodiment, a plurality of rotatable LEDs 23 in the LED light bar 2 are arranged in series, each rotatable LED23 is provided with a separate rotating shaft 3 and driving means connected thereto; further, in the LED light bar 2, the LEDs except the rotatable LED23 are connected in series and then connected in parallel with the plurality of rotatable LEDs 23, respectively, to ensure that each rotatable LED23 can be turned on individually and illuminate a designated area of the display panel as it rotates.

Preferably, in the above embodiment, the plurality of rotatable LEDs 23 are arranged in series, so that when they are turned on simultaneously, the luminous flux of a larger area in the display panel can be ensured, and only one rotatable LED23 can be controlled to be turned on as required; when the angle of the rotatable LED23 needs to be changed, the plurality of rotatable LEDs 23 can rotate at the same angle or rotate at different angles, so as to illuminate a plurality of areas in the display panel.

In another preferred embodiment, a plurality of rotatable LEDs 23 in the LED light bar 2 are arranged at intervals, and each rotatable LED23 is provided with an independent rotating shaft 3 and a driving device connected with the rotatable LED; further, in the LED light bar 2, other LEDs than the rotatable LED23 are connected in series and then connected in parallel with the plurality of rotatable LEDs 23, respectively, to ensure that each rotatable LED23 can be individually turned on and illuminate a designated area of the display panel as it rotates.

Preferably, in the above embodiment, the plurality of rotatable LEDs 23 are arranged at intervals, and when a user needs to light a certain area in the liquid crystal display screen, the plurality of rotatable LEDs 23 are collectively rotated to a certain angle to collectively light a certain area in the display panel; when multiple areas of the lcd display are desired to be displayed simultaneously, the plurality of rotatable LEDs 23 may be rotated to respective angles to illuminate the multiple different areas.

Specifically, in the above embodiments, those skilled in the art can understand that the size of the light guide plate 1 and the LED light bar 2, the number of the LEDs 22, the position of the rotatable LED23, etc. can be freely determined without departing from the scope of the present invention and the protection scope of the claims, and the detailed description thereof is omitted.

Example 3

In this embodiment, a display device is provided, which includes the backlight module according to embodiment 1 or embodiment 2. In addition, the display device of this embodiment further includes a back plate, a reflection plate, a rubber frame, an optical film set, and a display panel, which are not described herein again.

Optionally, the display device includes: the display device comprises any product or component with a display function, such as a liquid crystal display panel, electronic paper, a mobile phone, an intelligent watch, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.

The display device of the embodiment controls the turning-on and turning-around angles of the rotatable LED23 in the backlight module to achieve the effect of local lighting in any area of the display panel.

The utility model has the advantages of it is following:

The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention.

Claims

1. A backlight module is characterized by comprising a light guide plate and an LED light bar;

the LED lamp strip comprises a rotatable LED, the rotatable LED is connected with a driving device through a rotating shaft, and the rotating shaft is perpendicular to the emergent light direction of the LED lamp strip.

2. The backlight module according to claim 1, wherein the driving device is disposed on a side of the rotatable LED facing away from the emitting light direction; the driving device comprises a micro motor and a transmission shaft, and the transmission shaft is in transmission fit with the rotating shaft gear.

3. The backlight module according to claim 1, wherein the rotation axis is fixed to a middle portion of the rotatable LED.

4. The backlight module as claimed in claim 3, wherein the rotation angle of the rotatable LED is clockwise/counterclockwise rotation of 0-90 degrees.

5. The backlight module as claimed in claim 1, wherein the rotatable LED is disposed at any position of the LED light bar.

6. The backlight module of claim 5, wherein the rotatable LED is disposed in the center of the LED light bar.

7. The backlight module of claim 5, wherein the rotatable LEDs are disposed at ends of the LED light bars.

8. The backlight module of claim 1, wherein the LED light bar comprises at least two rotatable LEDs.

9. The backlight module of claim 1, wherein the other LEDs in the LED light bar are connected in series and then connected in parallel with the rotatable LED.

10. A display device comprising the backlight module according to any one of claims 1-9.