Backlight brightness automatic modulator for liquid crystal display

Abstract

The utility model discloses a backlight brightness automatic modulator for liquid crystal display. The backlight brightness automatic modulator comprises a liquid crystal display screen body, a mounting groove arranged at one end of the back surface of the liquid crystal display screen body, a positioning plate arranged in the mounting groove, a silicon controlled rectifier dimming power supply arranged at the front side of the positioning plate, and a button arranged at the back surface of the positioning plate, the positioning plate and the mounting groove are detachably connected through a locking assembly, the locking assembly comprises fixing grooves formed in the two ends of an inner cavity of the mounting groove, fixing pieces matched with the fixing grooves in an inserted connection mode are fixedly arranged at the two ends of the positioning plate, and locking grooves are formed in the opposite sides of the inner sides of the two fixing grooves correspondingly; a first protruding strip is fixedly arranged at the front end of one fixing piece. According to the backlight brightness automatic modulator for liquid crystal display, the silicon controlled rectifier dimming power supply and the liquid crystal display screen body are conveniently connected and fixed through the arranged locking assembly, disassembly, assembly, insertion and fixation can be achieved without using workpieces, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to the field of liquid crystal display screens, in particular to an automatic modulator for backlight brightness of liquid crystal display. Background Art

[0002] As the current mainstream display device, liquid crystal display has been more and more widely used in aerospace, household appliances, communication equipment and other fields, and is closely related to people's lives. The backlight module is an important part of the liquid crystal display. The brightness, chromaticity, uniformity, viewing angle and thickness of the backlight module of the light it provides have a great impact on the final performance of the display. When using existing LCD TVs, it is inconvenient to flexibly adjust the brightness of the backlight module, which causes the LCD display to be dark or bright, and then the picture display is unclear, which affects the display effect of the LCD display.

[0003] A liquid crystal television with adjustable backlight module brightness is disclosed in the Chinese utility model application number: 202221741336.X, including a liquid crystal television main body, the liquid crystal television main body including a shell, a liquid crystal panel is arranged in the inner cavity of the shell opening end, and a backlight module is arranged on the inner wall surface of the liquid crystal panel, and a backlight lamp tube for illuminating the backlight module is arranged on one side of the backlight module, a through hole is opened at the bottom of one side wall surface of the shell, and a positioning plate is arranged on the surface of the through hole, and a thyristor dimming power supply is arranged above one side of the inner wall surface of the positioning plate. The utility model can flexibly adjust the current flowing through the backlight lamp tube according to the demand, so as to change the brightness of the backlight module, thereby meeting the practical needs of users, and at the same time, it can discharge the heat inside the liquid crystal television main body, thereby improving the service life and safety of the internal equipment of the liquid crystal television main body.

[0004] In the above-mentioned prior art, the automatic adjustment of the LCD display backlight brightness is achieved through a thyristor dimming power supply, but this type of modulator is fixed by screws, and it is often necessary to remove it with a screwdriver during maintenance and disassembly, which is time-consuming and labor-intensive. In addition, the screws are easily damaged after being unscrewed and reinstalled multiple times, which may cause thread slippage, making it inconvenient to use.

[0005] Therefore, it is necessary to propose an automatic backlight brightness modulator for liquid crystal display to solve the above problems. Utility Model Content

[0006] The main purpose of the utility model is to provide an automatic backlight brightness modulator for a liquid crystal display, which can effectively solve the problems in the background technology.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] An automatic backlight brightness modulator for a liquid crystal display comprises a liquid crystal display body, a mounting groove arranged at one end of the back of the liquid crystal display body, a positioning plate arranged in the mounting groove, a thyristor dimming power supply arranged at the front side of the positioning plate, and a key button arranged at the back of the positioning plate;

[0009] The locking plate is provided at one end of the second locking plate and the other end of the second locking plate is provided with a locking block which is adapted to engage with the locking plate when the locking plate is in a state of being moved along the cam face.

[0010] Preferably, two locking grooves are provided in the same vertical direction, and the locking blocks correspond to the locking grooves one by one.

[0011] Preferably, rear ends of the first convex strip and the second convex strip both protrude from the back side of the positioning plate.

[0012] Preferably, installation cavities are provided on the inner sides of both upper and lower ends of the positioning plate, and the gear is located on the inner side of the installation cavity;

[0013] One end of the second rack and the first rack are both located inside the installation cavity.

[0014] Preferably, a second spring is arranged between one end of the first rack away from the second protruding strip and the inner wall of the installation cavity, and one end of the locking block protrudes from the side wall of the fixing plate in the reset state of the second spring.

[0015] Preferably, it also includes an anti-loosening component, which includes a blind hole arranged on the inner side of the fixing groove, the blind hole is arranged along the depth direction of the installation groove, a floating block is arranged on the inner side of the blind hole, a first spring is arranged between the floating block and the inner wall of the blind hole, and in the reset state of the first spring, one end of the floating block protrudes from the inner wall of the fixing groove, and the floating block is in contact with the fixing plate.

[0016] Compared with the prior art, the utility model provides an automatic modulator for liquid crystal display backlight brightness, which has the following beneficial effects:

[0017] The automatic modulator for liquid crystal display backlight brightness facilitates the connection and fixation between the thyristor dimming power supply and the liquid crystal display screen body through the arranged locking component, can realize disassembly and assembly without using a workpiece, plug-in fixation, easy operation, little wear, and can improve the efficiency of disassembly and assembly. The arrangement of the anti-loosening component can increase the stability of the thyristor dimming power supply in the installation groove, and the reverse action force of the first spring always acts on the positioning plate, thereby preventing the positioning plate from loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the utility model when the positioning plate and the liquid crystal display screen body are separated;

[0020] Figure 3 It is a structural schematic diagram of the utility model in which the floating block and the blind hole are separated;

[0021] Figure 4 It is a structural schematic diagram of the positioning plate of the utility model;

[0022] Figure 5 This utility model Figure 3 Enlarged view of point A in the middle;

[0023] Figure 6 It is a schematic diagram of the cross-sectional structure of the positioning plate of the utility model.

[0024] In the figure: 1. LCD screen body; 2. Positioning plate; 3. Thyristor dimming power supply; 4. Mounting slot; 5. Key button; 6. First convex strip; 7. Fixing plate; 8. Second convex strip; 9. Groove; 10. Locking block; 11. First rack; 12. Fixing slot; 13. Locking slot; 14. Floating block; 15. Blind hole; 16. First spring; 17. Second spring; 18. Gear; 19. Second rack; 20. Mounting cavity. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0026] like Figure 1-6 As shown, an automatic modulator for backlight brightness of a liquid crystal display comprises a liquid crystal display body 1, a mounting groove 4 arranged at one end of the back of the liquid crystal display body 1, a positioning plate 2 arranged in the mounting groove 4, a thyristor dimming power supply 3 arranged on the front side of the positioning plate 2, and a key button 5 arranged on the back of the positioning plate 2;

[0027] Furthermore, the positioning plate 2 and the mounting slot 4 are detachably connected via a locking assembly;

[0028] As a preferred embodiment, the locking assembly includes a fixing groove 12 arranged at both ends of the inner cavity of the installation groove 4, and a fixing piece 7 plugged into the fixing groove 12 is fixedly arranged at both ends of the positioning plate 2. The opposite side of the inner side of the two fixing grooves 12 is provided with a locking groove 13, and two locking grooves 13 are provided in the same vertical direction. The front end of one of the fixing pieces 7 is fixedly provided with a first convex strip 6, and the rear ends of the first convex strip 6 and the second convex strip 8 both protrude from the back side of the positioning plate 2. The front end of the other fixing piece 7 is provided with a groove 9, and the groove 9 is movably connected with the second convex strip 8. The inner side of the positioning plate 2 is rotatably connected with a gear 18, and one side of the gear 18 is meshed with a second rack 19. The first rack 11 is meshed with the side opposite to the second rack 19, and one end of the first rack 11 extends to the inner side of the groove 9 and is fixedly connected to the side wall of the second convex strip 8. The inner sides of the upper and lower ends of the positioning plate 2 are provided with mounting cavities 20, the gear 18 is located on the inner side of the mounting cavity 20, the second rack 19 and one end of the first rack 11 are both located on the inner side of the mounting cavity 20, one end of the second rack 19 extends to the inner side of another fixed plate 7, and a locking block 10 that is plugged into the locking groove 13 is provided on the side of the second convex strip 8 away from the first rack 11 and the end of the second rack 19 away from the gear 18, and the locking block 10 corresponds to the locking groove 13 one by one.

[0029] Furthermore, in order to facilitate the resetting and extension of the locking block 10 and prevent it from being easily retracted, a second spring 17 is arranged between the end of the first rack 11 away from the second protrusion 8 and the inner wall of the mounting cavity 20, and one end of the locking block 10 protrudes from the side wall of the fixing plate 7 when the second spring 17 is in the resetting state.

[0030] In addition, it also includes an anti-loosening component, which includes a blind hole 15 arranged on the inner side of the fixing groove 12, the blind hole 15 is arranged along the depth direction of the installation groove 4, and a floating block 14 is arranged on the inner side of the blind hole 15. A first spring 16 is arranged between the floating block 14 and the inner wall of the blind hole 15, and one end of the floating block 14 protrudes from the inner wall of the fixing groove 12 in the reset state of the first spring 16, and the floating block 14 is in contact with the fixing plate 7.

[0031] It should be noted that the utility model is an automatic modulator for backlight brightness of liquid crystal display. When in use, pinch the first convex strip 6 and the second convex strip 8, and push the second convex strip 8 in the direction of the first convex strip 6, the second convex strip 8 drives the first rack 11 and the locking block 10 at one end to move, the first rack 11 drives the second rack 19 to move in the opposite direction through the gear 18, and then the second rack 19 drives the locking block 10 at the other end to move, the second spring 17 is compressed until the locking blocks 10 at both ends are hidden inside the fixing plate 7, and the thyristor dimming is turned on. The power supply 3 is fixed on the positioning plate 2, and then the positioning plate 2 is placed in the installation groove 4, the fixing sheet 7 enters the fixing groove 12, and the positioning plate 2 is pressed, and the fixing sheet 7 presses the floating block 14, and the floating block 14 compresses the first spring 16, and then the first spring 16 generates a reverse force until it is pressed and cannot move, and then the second convex strip 8 is loosened, the second spring 17 is reset, the first rack 11 and the second rack 19 are reversely displaced and reset, and then the locking blocks 10 at both ends enter the locking groove 13 to fix the positioning plate 2, which is not only easy to operate, but also not easy to loosen and wear-resistant;

[0032] The specific structure of the thyristor dimming power supply 3 and the principle of automatically adjusting the backlight brightness are both existing technologies and will not be described in detail.

[0033] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. An automatic backlight brightness modulator for a liquid crystal display, comprising a liquid crystal display body (1), a mounting groove (4) arranged at one end of the back of the liquid crystal display body (1), a positioning plate (2) arranged in the mounting groove (4), a thyristor dimming power supply (3) arranged at the front side of the positioning plate (2), and a key button (5) arranged at the back of the positioning plate (2); Features: The positioning plate (2) and the mounting groove (4) are detachably connected via a locking assembly, wherein the locking assembly comprises fixing grooves (12) arranged at both ends of the inner cavity of the mounting groove (4), fixing plates (7) plugged into and matched with the fixing grooves (12) are fixedly arranged at both ends of the positioning plate (2), and locking grooves (13) are arranged on opposite sides of the inner sides of the two fixing grooves (12), wherein a first convex strip (6) is fixedly arranged at the front end of one of the fixing plates (7), and a groove (9) is arranged at the front end of the other fixing plate (7), and the groove (9) is movably connected to the second convex strip (8), and the positioning plate (2) A gear (18) is rotatably connected to the inner side of the gear (18), a second rack (19) is meshed with one side of the gear (18), a first rack (11) is meshed with the side opposite to the second rack (19), one end of the first rack (11) extends to the inner side of the groove (9) and is fixedly connected to the side wall of the second convex strip (8), one end of the second rack (19) extends to the inner side of another fixing plate (7), and a locking block (10) which is plugged into and matched with the locking groove (13) is provided on the side of the second convex strip (8) away from the first rack (11) and on the end of the second rack (19) away from the gear (18).

2. The automatic backlight brightness modulator for liquid crystal display according to claim 1, Features: Two locking grooves (13) are arranged in the same vertical direction, and the locking blocks (10) correspond to the locking grooves (13) one by one.

3. The automatic backlight brightness modulator for liquid crystal display according to claim 1, Features: The rear ends of the first convex strip (6) and the second convex strip (8) both protrude from the back side of the positioning plate (2).

4. The automatic backlight brightness modulator for liquid crystal display according to claim 1, Features: The inner sides of the upper and lower ends of the positioning plate (2) are both provided with mounting cavities (20), and the gear (18) is located inside the mounting cavity (20); One end of the second rack (19) and the first rack (11) are both located inside the mounting cavity (20).

5. The automatic backlight brightness modulator for liquid crystal display according to claim 4, Features: A second spring (17) is provided between one end of the first rack (11) away from the second convex strip (8) and the inner wall of the installation cavity (20), and one end of the locking block (10) protrudes from the side wall of the fixing plate (7) when the second spring (17) is in a reset state.

6. The automatic backlight brightness modulator for liquid crystal display according to claim 1, Features: The invention also comprises an anti-loosening component, which comprises a blind hole (15) arranged inside the fixing groove (12), the blind hole (15) being arranged along the depth direction of the mounting groove (4), a floating block (14) being arranged inside the blind hole (15), a first spring (16) being arranged between the floating block (14) and the inner wall of the blind hole (15), and one end of the floating block (14) protruding from the inner wall of the fixing groove (12) when the first spring (16) is in a reset state, and the floating block (14) is in abutment with the fixing plate (7).

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