A liquid crystal display capable of controlling the viewing angle

Abstract

The present invention relates to a liquid crystal display screen, and particularly to a liquid crystal display screen capable of controlling the viewing angle. It is necessary to design a liquid crystal display screen capable of controlling the viewing angle that facilitates people to adjust the viewing angle of the display screen without affecting the visual environment of the user. A liquid crystal display screen capable of controlling the viewing angle includes a fixed back frame, a liquid crystal display screen, a fixed frame, and hinged side plates. The rear part of the fixed back frame is connected to the fixed frame by a bolt connection method. The liquid crystal display screen is used for people to have a movie-watching experience. The hinged side plates are rotatably connected to both the left and right sides of the fixed frame. In the present invention, people can pull the liquid crystal display screen to move left and right through the hinged side plates according to needs. Similarly, people can also pull the liquid crystal display screen to swing back and forth through the link rod for angle adjustment. The positioning spring plays a buffering role. In this way, it is convenient for people to adjust the viewing angle of the display screen without affecting the visual environment of the user.

Description

Technical Field

[0001] The present invention relates to a liquid crystal display screen, and particularly to a liquid crystal display screen capable of controlling the viewing angle. Background Art

[0002] A liquid crystal display (LCD) is a type of display used in digital clocks and many portable computers. The LCD display uses two pieces of polarizing material with a liquid crystal solution between them.

[0003] Patent application CN211956055U discloses a spliced liquid crystal display screen. The spliced liquid crystal display screen of the present invention includes a first liquid crystal display screen and a plurality of second liquid crystal display screens, and the first liquid crystal display screen is respectively spliced with each of the second liquid crystal display screens; the first liquid crystal display screen further includes a main control board, a signal distribution module and at least one signal source, the main control board is respectively connected with the at least one signal source and the signal distribution module, and the main control board is used to send the display signal of the at least one signal source to the signal distribution module; the signal distribution module is also respectively connected with each of the second liquid crystal display screens, and the signal distribution module is used to send the display signal of the at least one signal source to the plurality of second liquid crystal display screens for display. When the spliced liquid crystal display screen of the present invention realizes the display function, no complex connection is required and a large number of external connection lines will not be generated, and the connection process is relatively simple. Although the above patent can realize normal viewing, when the display screen is in use, the angle cannot be adjusted arbitrarily, so that the user can only use it within a certain viewing angle, which affects the user's visual environment.

[0004] Based on the defects existing in the prior art, we propose a liquid crystal display screen capable of controlling the viewing angle, which is convenient for people to adjust the viewing angle of the display screen and does not affect the user's visual environment. Summary of the Invention

[0005] In order to overcome the defect that when the display screen is in use, the angle cannot be adjusted arbitrarily, so that the user can only use it within a certain viewing angle, which affects the user's visual environment, the purpose of the present invention is to provide a liquid crystal display screen capable of controlling the viewing angle, which is convenient for people to adjust the viewing angle of the display screen and does not affect the user's visual environment.

[0006] The technical solution of the present invention is as follows:

[0007] A liquid crystal display capable of controlling the viewing angle, comprising a fixed back frame, a liquid crystal display screen, a fixed frame, hinged side plates and positioning rubber rods. The rear part of the fixed back frame is connected to the fixed frame by a bolt connection method. The liquid crystal display screen is used for people to have a viewing experience. The left and right sides of the fixed frame are rotatably connected with hinged side plates, and the positioning rubber rods are rotatably connected symmetrically up and down between the left and right hinged side plates. It also includes a connecting mechanism and a supporting mechanism. A connecting mechanism for installation and connection is arranged on the fixed back frame. The connecting mechanism is fixedly connected to the liquid crystal display screen, and a supporting mechanism for supporting and guiding is arranged between the fixed back frame and the liquid crystal display screen.

[0008] As a further preferred solution, the connecting mechanism includes connecting rods, fixed bases and positioning springs. The fixed bases are symmetrically and fixedly connected to the middle of the front side of the fixed back frame on the left and right. The middle parts of the fixed bases on the left and right are rotatably connected with connecting rods. The connecting rods on the left and right are both connected to the liquid crystal display screen by bolts. Four positioning springs are evenly and fixedly connected between the rear side of the liquid crystal display screen and the front side of the fixed back frame.

[0009] As a further preferred solution, the supporting mechanism includes positioning sliders, supporting slide rods, hinged sliders and positioning slide rails. The positioning sliders are embedded and connected to the lower parts of the left and right sides of the fixed back frame. The supporting slide rods are slidably connected inside the positioning sliders on the left and right. The positioning slide rails are symmetrically and fixedly connected to the lower parts of the rear side of the liquid crystal display screen on the left and right. The hinged sliders are slidably connected inside the positioning slide rails on the left and right. The hinged sliders on the left and right are respectively rotatably connected to the supporting slide rods on the left and right.

[0010] As a further preferred solution, it also includes a positioning mechanism for driving the liquid crystal display screen to swing. The positioning mechanism includes a positioning bottom cover, a limiting connecting rod, a first transmission connecting rod, a servo motor, a driving shaft, a reversing horizontal shaft, magnetic pulleys, a positioning belt, a fixed connecting block and a slotted bent plate. The limiting connecting rod is fixedly connected to the rear part of the left side of the right hinged rod. The first transmission connecting rod is rotatably connected to the middle of the right part of the fixed back frame. The positioning bottom cover is rotatably connected between the left part of the first transmission connecting rod and the left part of the limiting connecting rod. The first transmission connecting rod and the limiting connecting rod are driven by a belt. The servo motor providing power is embedded and connected to the lower side of the right part of the fixed back frame. The output shaft of the servo motor is connected to the driving shaft. The reversing horizontal shafts are rotatably connected to the upper and lower sides of the fixed back frame. The lower reversing horizontal shaft and the driving shaft are driven by a belt. The magnetic pulleys are rotatably sleeved on the right parts of the upper and lower reversing horizontal shafts. The upper and lower magnetic pulleys are in magnetic contact with the upper and lower reversing horizontal shafts respectively. The positioning belt is wound between the upper and lower magnetic pulleys. The fixed connecting block is slidably connected to the right part of the fixed back frame. The fixed connecting block is fixedly connected to the positioning belt. The slotted bent plate is fixedly connected to the right part of the first transmission connecting rod. The slotted bent plate is slidably connected to the fixed connecting block.

[0011] As a further preferred solution, it further includes a locking mechanism for locking the liquid crystal display screen. The locking mechanism includes a locking disc, a second transmission connecting rod, a locking vertical plate, a positioning lock block, a reset chassis, a reset spring, and a slotted electromagnetic tube. The rear part of the left side surface of the left connecting rod is fixedly connected with the second transmission connecting rod. The left part of the second transmission connecting rod is fixedly connected with the locking disc. The lower side of the left part of the fixed backrest is slidably connected with the reset chassis. The left side surface of the reset chassis is fixedly connected with the locking vertical plate. The upper part of the locking vertical plate is fixedly connected with the positioning lock block. The positioning lock block is inserted into the locking disc. The upper and lower sides between the right part of the reset chassis and the inside of the fixed backrest are symmetrically connected with reset springs. The left part of the lower reversing cross shaft is rotatably sleeved with a slotted electromagnetic tube. The slotted electromagnetic tube is in magnetic contact with the lower reversing cross shaft. The slotted electromagnetic tube is threadedly connected with the locking vertical plate.

[0012] As a further preferred solution, it further includes a dust-proof mechanism for dust-proof protection. The dust-proof mechanism includes a dust-proof rubber sleeve and a rubber fixing bracket. Four rubber fixing brackets are evenly spaced and fixedly connected between the fixed backrest and the liquid crystal display screen. A dust-proof rubber sleeve for dust-proof protection is fixedly connected between the four rubber fixing brackets.

[0013] As a further preferred solution, it further includes an auxiliary lighting mechanism for relieving visual fatigue. The auxiliary lighting mechanism includes a positioning bottom plate, a limit rotating shaft, and an eye protection lamp. The upper part of the liquid crystal display screen is rotatably connected with the limit rotating shaft. The middle part of the limit rotating shaft is fixedly connected with the positioning bottom plate. The lower part of the positioning bottom plate is connected with an eye protection lamp for relieving visual fatigue.

[0014] The present invention has the following advantages:

[0015] 1. People can adjust the liquid crystal display screen to move left and right by pulling the articulated side plate according to needs. Similarly, people can also pull the liquid crystal display screen to swing back and forth by the connecting rod for angle adjustment. The positioning spring plays a buffering role. In this way, it is convenient for people to adjust the viewing angle of the display screen without affecting the visual environment of the user.

[0016] 2. Under the action of the positioning mechanism, when the servo motor is started to work, the first transmission connecting rod rotates and drives the limit connecting rod to rotate through belt transmission. The limit connecting rod rotates and drives the right connecting rod to swing up and down. The swinging of the left and right connecting rods cooperates to drive the liquid crystal display screen to swing back and forth for angle adjustment. In this way, there is no need to manually adjust the viewing angle of the liquid crystal display screen.

[0017] 3. Under the action of the locking mechanism, the positioning lock block moves to the right and is inserted into the locking disc. The positioning lock block limits the locking disc, and thus the liquid crystal display screen is limited. In this way, it is convenient to limit the liquid crystal display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0019] Figure 2 The first partial sectional structure schematic diagram of the present invention.

[0020] Figure 3 The partial sectional structure schematic diagram of the connection mechanism of the present invention.

[0021] Figure 4 The partial sectional structure schematic diagram of the support mechanism of the present invention.

[0022] Figure 5 The second partial sectional structure schematic diagram of the present invention.

[0023] Figure 6 The first partial sectional structure schematic diagram of the positioning mechanism of the present invention.

[0024] Figure 7 The second partial sectional structure schematic diagram of the positioning mechanism of the present invention.

[0025] Figure 8 The third partial sectional structure schematic diagram of the positioning mechanism of the present invention.

[0026] Figure 9 The first partial sectional structure schematic diagram of the locking mechanism of the present invention.

[0027] Figure 10 The second partial sectional structure schematic diagram of the locking mechanism of the present invention.

[0028] Figure 11 The third partial sectional structure schematic diagram of the locking mechanism of the present invention.

[0029] Figure 12 The third partial sectional structure schematic diagram of the present invention.

[0030] Figure 13 The partial sectional structure schematic diagram of the dust-proof mechanism of the present invention.

[0031] Figure 14 The partial sectional structure schematic diagram of the auxiliary lighting mechanism of the present invention.

[0032] Names of the reference numerals in the figure: 1 - fixed back frame, 2 - liquid crystal display screen, 3 - fixed frame, 4 - hinged side plate, 5 - positioning rubber rod, 6 - connecting mechanism, 61 - link rod, 62 - fixed base, 63 - positioning spring, 7 - supporting mechanism, 71 - positioning slider, 72 - supporting slide rod, 73 - hinged slider, 74 - positioning slide rail, 8 - positioning mechanism, 81 - positioning bottom cover, 82 - limiting link rod, 83 - first transmission link rod, 84 - servo motor, 85 - drive shaft, 86 - reversing cross shaft, 87 - magnetic pulley, 88 - positioning belt, 89 - fixed connecting block, 810 - slotted bent plate, 9 - locking mechanism, 91 - locking disc, 92 - second transmission link rod, 93 - locking vertical plate, 94 - positioning lock block, 95 - reset bottom frame, 96 - reset spring, 97 - slotted electromagnetic tube, 10 - dust-proof mechanism, 101 - dust-proof rubber sleeve, 102 - rubber fixing bracket, 11 - auxiliary lighting mechanism, 111 - positioning bottom plate, 112 - limiting rotating shaft, 113 - eye protection lamp. Detailed implementation manners

[0033] The following further illustrates the technical solution in combination with specific embodiments. It should be noted that: The words indicating directions such as up, down, left, and right mentioned in this article are only in terms of the positions of the shown structures in the corresponding drawings. The serial numbers assigned to the components in this article itself, for example: the first, the second, etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And as used in this application: connection, coupling, unless otherwise specified, all include direct and indirect connections.

[0034] Embodiment 1

[0035] A liquid crystal display screen capable of controlling the viewing angle, as Figures 1-4 shown, includes a fixed back frame 1, a liquid crystal display screen 2, a fixed frame 3, hinged side plates 4, positioning rubber rods 5, a connecting mechanism 6, and a supporting mechanism 7. The rear part of the fixed back frame 1 is connected to the fixed frame 3 by a bolt connection method. The left and right sides of the fixed frame 3 are rotatably connected to the hinged side plates 4. The positioning rubber rods 5 are rotatably connected symmetrically up and down between the left and right hinged side plates 4. A connecting mechanism 6 is provided on the fixed back frame 1. The connecting mechanism 6 is connected to the liquid crystal display screen 2 and can be used for mounting and connecting the liquid crystal display screen 2. A supporting mechanism 7 is provided between the fixed back frame 1 and the liquid crystal display screen 2. The supporting mechanism 7 is used for supporting and guiding when the liquid crystal display screen 2 adjusts the angle.

[0036] As Figure 2 and Figure 3As shown, the connecting mechanism 6 includes a link rod 61, a fixed base 62, and a positioning spring 63. The fixed backrest 1 is symmetrically and fixedly connected to the fixed base 62 on the left and right sides in the middle of the front side. The middle parts of the fixed bases 62 on the left and right sides are rotatably connected to the link rod 61. The link rods 61 on the left and right sides are both bolted to the liquid crystal display screen 2. Four positioning springs 63 are evenly spaced and fixedly connected between the rear side of the liquid crystal display screen 2 and the front side of the fixed backrest 1.

[0037] As Figure 2 and Figure 4 shown, the supporting mechanism 7 includes a positioning slider 71, a supporting slide rod 72, a hinged slider 73, and a positioning slide rail 74. The positioning sliders 71 are embedded and connected to the lower parts on the left and right sides of the fixed backrest 1. The supporting slide rods 72 are slidably connected inside the positioning sliders 71 on the left and right sides. The positioning slide rails 74 are symmetrically and fixedly connected to the lower parts on the left and right sides of the rear side of the liquid crystal display screen 2. The hinged sliders 73 are slidably connected inside the positioning slide rails 74 on the left and right sides. The hinged sliders 73 on the left and right sides are respectively rotatably connected to the supporting slide rods 72 on the left and right sides.

[0038] First, the operator installs the upper and lower positioning rubber rods 5 on the wall using bolts. People can pull the liquid crystal display screen 2 to move left and right for adjustment by pulling the hinged side plate 4 according to their needs. Similarly, people can also pull the liquid crystal display screen 2 to swing back and forth for angle adjustment by pulling the link rod 61. The positioning spring 63 plays a buffering role. Since there is damping between the link rods 61 on the left and right sides and the fixed bases 62 on the left and right sides respectively, after the front and rear angle adjustment of the liquid crystal display screen 2 is completed, the liquid crystal display screen 2 will not produce a rebound phenomenon. And the supporting slide rods 72 on the left and right sides slide inside the positioning sliders 71 on the left and right sides respectively, and the supporting slide rods 72 on the left and right sides play a role in supporting and guiding the liquid crystal display screen 2.

[0039] Embodiment 2

[0040] On the basis of Embodiment 1, as Figures 5-8As shown in the figure, it further includes a positioning mechanism 8. The positioning mechanism 8 includes a positioning bottom cover 81, a limiting connecting rod 82, a first transmission connecting rod 83, a servo motor 84, a driving shaft 85, a reversing horizontal shaft 86, a magnetic pulley 87, a positioning belt 88, a fixed connecting block 89, and a slotted bending plate 810. The rear part of the left side of the right connecting rod 61 is fixedly connected with the limiting connecting rod 82. The middle part of the right side of the fixed backrest 1 is rotatably connected with the first transmission connecting rod 83. There is a positioning bottom cover 81 rotatably connected between the left part of the first transmission connecting rod 83 and the left part of the limiting connecting rod 82. The first transmission connecting rod 83 and the limiting connecting rod 82 are driven by a belt. The servo motor 84 is embedded and connected to the lower side of the right part of the fixed backrest 1. The servo motor 84 can provide power to adjust the viewing angle of the liquid crystal display screen 2. The output shaft of the servo motor 84 is connected with the driving shaft 85. The upper and lower sides of the fixed backrest 1 are both rotatably connected with the reversing horizontal shaft 86. There is a belt drive between the lower reversing horizontal shaft 86 and the driving shaft 85. The right parts of the upper and lower reversing horizontal shafts 86 are both rotatably sleeved with magnetic pulleys 87. The upper and lower magnetic pulleys 87 are in magnetic contact with the upper and lower reversing horizontal shafts 86 respectively. There is a positioning belt 88 wound between the upper and lower magnetic pulleys 87. The right part of the fixed backrest 1 is slidably connected with the fixed connecting block 89. The fixed connecting block 89 is fixedly connected with the positioning belt 88. The right part of the first transmission connecting rod 83 is fixedly connected with the slotted bending plate 810. The slotted bending plate 810 is slidably connected with the fixed connecting block 89.

[0041] As Figure 5 , Figure 9 , Figure 10 and Figure 11 shown in the figure, it further includes a locking mechanism 9. The locking mechanism 9 includes a locking disc 91, a second transmission connecting rod 92, a locking vertical plate 93, a positioning lock block 94, a reset bottom frame 95, a reset spring 96, and a slotted electromagnetic tube 97. The rear part of the left side of the left connecting rod 61 is fixedly connected with the second transmission connecting rod 92. The left part of the second transmission connecting rod 92 is fixedly connected with the locking disc 91. The reset bottom frame 95 is slidably connected to the lower side of the left part of the fixed backrest 1. The left side of the reset bottom frame 95 is fixedly connected with the locking vertical plate 93. The upper part of the locking vertical plate 93 is fixedly connected with the positioning lock block 94. The positioning lock block 94 is inserted into the locking disc 91. The positioning lock block 94 can limit the locking disc 91, and thus the liquid crystal display screen 2 is also limited. The upper and lower symmetrical reset springs 96 are connected between the right part of the reset bottom frame 95 and the inside of the fixed backrest 1. The left part of the lower reversing horizontal shaft 86 is rotatably sleeved with the slotted electromagnetic tube 97. The slotted electromagnetic tube 97 is in magnetic contact with the lower reversing horizontal shaft 86. The slotted electromagnetic tube 97 is threadedly connected with the locking vertical plate 93.

[0042] When people operate the liquid crystal display screen 2, if it is necessary to adjust the liquid crystal display screen 2 to swing backward, the servo motor 84 can be started to reverse. The reverse rotation of the servo motor 84 drives the drive shaft 85 to reverse. The reverse rotation of the drive shaft 85 drives the lower reversing horizontal shaft 86 to reverse through belt transmission. The reverse rotation of the lower reversing horizontal shaft 86 drives the lower magnetic pulley 87 to reverse. The reverse rotation of the upper and lower magnetic pulleys 87 cooperates to drive the positioning belt 88 to reverse. The reverse rotation of the positioning belt 88 drives the fixed connecting block 89 to move downward. The downward movement of the fixed connecting block 89 drives the slotted bent plate 810 to swing backward. The backward swing of the slotted bent plate 810 drives the first transmission connecting rod 83 to rotate forward. The forward rotation of the first transmission connecting rod 83 drives the limit connecting rod 82 to rotate forward through belt transmission. The forward rotation of the limit connecting rod 82 drives the right connecting rod 61 to swing upward. The upward swing of the left and right connecting rods 61 cooperates to drive the liquid crystal display screen 2 to swing backward. Subsequently, when the liquid crystal display screen 2 swings backward to an appropriate position, the servo motor 84 can be turned off. Similarly, if it is necessary to adjust the liquid crystal display screen 2 to swing forward, start the servo motor 84 to rotate forward. Subsequently, the fixed connecting block 89 also drives the slotted bent plate 810 to swing forward. The forward swing of the slotted bent plate 810 drives the first transmission connecting rod 83 to rotate reversely. The reverse rotation of the first transmission connecting rod 83 drives the limit connecting rod 82 to rotate reversely through belt transmission. The reverse rotation of the limit connecting rod 82 drives the right connecting rod 61 to swing downward. Furthermore, the downward swing of the left and right connecting rods 61 cooperates to drive the liquid crystal display screen 2 to swing forward. When the liquid crystal display screen 2 swings forward to an appropriate position, turn off the servo motor 84. In this way, there is no need to manually adjust the viewing angle of the liquid crystal display screen 2.

[0043] When the servo motor 84 works, the rotation of the lower reversing horizontal shaft 86 drives the slotted electromagnetic tube 97 to rotate. The rotation of the slotted electromagnetic tube 97 drives the locking vertical plate 93 to move leftward. The leftward movement of the locking vertical plate 93 drives the reset bottom frame 95 to move leftward. The reset spring 96 is compressed. The leftward movement of the locking vertical plate 93 also drives the positioning lock block 94 to move leftward. The leftward movement of the positioning lock block 94 disengages from the locking disc 91. Subsequently, after the positioning lock block 94 moves leftward to the maximum stroke, the lower reversing horizontal shaft 86 idles in the slotted electromagnetic tube 97. Thus, the left and right connecting rods 61 drive the liquid crystal display screen 2 to swing back and forth to adjust the angle. The left connecting rod 61 drives the locking disc 91 to rotate through the second transmission connecting rod 92. After the liquid crystal display screen 2 is adjusted to an appropriate angle, turn off the servo motor 84. Due to the action of the reset spring 96, the reset bottom frame 95 drives the positioning lock block 94 to move rightward and reset through the locking vertical plate 93. The rightward movement of the positioning lock block 94 inserts into the locking disc 91. The positioning lock block 94 limits the locking disc 91, and the liquid crystal display screen 2 is thus limited. In this way, it is convenient to limit the liquid crystal display screen 2.

[0044] Embodiment 3

[0045] Based on Embodiment 1 and Embodiment 2, as Figure 12 and Figure 13As shown, it further includes a dust-proof mechanism 10. The dust-proof mechanism 10 includes a dust-proof rubber sleeve 101 and a rubber fixing bracket 102. Four rubber fixing brackets 102 are fixedly connected between the fixed back frame 1 and the liquid crystal display screen 2 at equal intervals. A dust-proof rubber sleeve 101 is fixedly connected between the four rubber fixing brackets 102. The dust-proof rubber sleeve 101 can prevent dust or impurities from entering the gap between the liquid crystal display screen 2 and the fixed back frame 1.

[0046] As Figure 12 and Figure 14 As shown, it further includes an auxiliary lighting mechanism 11. The auxiliary lighting mechanism 11 includes a positioning bottom plate 111, a limit rotating shaft 112 and an eye protection lamp 113. The upper part of the liquid crystal display screen 2 is rotatably connected with a limit rotating shaft 112. A positioning bottom plate 111 is fixedly connected to the middle of the limit rotating shaft 112. An eye protection lamp 113 is connected to the lower part of the positioning bottom plate 111. In a dim environment, the eye protection lamp 113 can achieve auxiliary supplementary lighting to relieve visual fatigue.

[0047] When people use this device, the dust-proof rubber sleeve 101 can prevent dust or impurities from entering between the liquid crystal display screen 2 and the fixed back frame 1, affecting the use efficiency of the liquid crystal display screen 2. Thus, dust accumulation in the gap between the liquid crystal display screen 2 and the fixed back frame 1 can be avoided.

[0048] When people watch the liquid crystal display screen 2, if in a dim environment, start the eye protection lamp 113 to work. The eye protection lamp 113 performs auxiliary supplementary lighting to relieve visual fatigue. After the device is no longer needed, just turn off the eye protection lamp 113. Thus, visual fatigue can be effectively relieved in a dim environment.

[0049] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A liquid crystal display capable of controlling the viewing angle, comprising a fixed back frame, a liquid crystal display screen, a fixed frame, hinged side plates and positioning rubber rods. The rear part of the fixed back frame is connected to the fixed frame by means of bolt connection. The liquid crystal display screen is used for people to have a viewing experience. The left and right sides of the fixed frame are rotatably connected with hinged side plates, and the positioning rubber rods are symmetrically and rotatably connected up and down between the left and right hinged side plates. Characterized in that, It further comprises a connecting mechanism and a supporting mechanism. A connecting mechanism for installation and connection is arranged on the fixed back frame. The connecting mechanism is fixedly connected to the liquid crystal display screen. A supporting mechanism for supporting and guiding is arranged between the fixed back frame and the liquid crystal display screen; The connecting mechanism comprises connecting rods, fixed bases and positioning springs. The middle parts of the front sides of the fixed back frame are symmetrically and fixedly connected with fixed bases on the left and right. The middle parts of the left and right fixed bases are rotatably connected with connecting rods. The left and right connecting rods are both connected to the liquid crystal display screen by bolts. Four positioning springs are evenly spaced and fixedly connected between the rear side of the liquid crystal display screen and the front side of the fixed back frame; The supporting mechanism comprises positioning sliders, supporting slide rods, hinged sliders and positioning slide rails. The lower parts of the left and right sides of the fixed back frame are embedded with positioning sliders. The supporting slide rods are slidably connected inside the left and right positioning sliders. The lower parts of the rear sides of the liquid crystal display screen are symmetrically and fixedly connected with positioning slide rails on the left and right. The hinged sliders are slidably connected inside the left and right positioning slide rails. The left and right hinged sliders are respectively rotatably connected to the left and right supporting slide rods; It further comprises a positioning mechanism for driving the liquid crystal display screen to swing. The positioning mechanism comprises a positioning bottom cover, a limiting connecting rod, a first transmission connecting rod, a servo motor, a driving shaft, a reversing horizontal shaft, magnetic pulleys, a positioning belt, a fixed connecting block and a slotted bent plate. The rear part of the left side of the right hinged rod is fixedly connected with the limiting connecting rod. The middle part of the right side of the fixed back frame is rotatably connected with the first transmission connecting rod. A positioning bottom cover is rotatably connected between the left part of the first transmission connecting rod and the left part of the limiting connecting rod. The first transmission connecting rod and the limiting connecting rod are driven by a belt. The servo motor providing power is embedded at the lower right side of the fixed back frame. The output shaft of the servo motor is connected with the driving shaft. The reversing horizontal shafts are rotatably connected to the upper and lower sides of the fixed back frame. The lower reversing horizontal shaft and the driving shaft are driven by a belt. Magnetic pulleys are rotatably sleeved on the right parts of the upper and lower reversing horizontal shafts. The upper and lower magnetic pulleys are in magnetic contact with the upper and lower reversing horizontal shafts respectively. A positioning belt is wound between the upper and lower magnetic pulleys. The fixed connecting block is slidably connected to the right part of the fixed back frame. The fixed connecting block is fixedly connected with the positioning belt. The right part of the first transmission connecting rod is fixedly connected with the slotted bent plate. The slotted bent plate is slidably connected with the fixed connecting block.

2. A liquid crystal display capable of controlling the viewing angle according to claim 1, Characterized in that, It further includes a locking mechanism for locking the liquid crystal display screen. The locking mechanism includes a locking disc, a second transmission connecting rod, a locking vertical plate, a positioning lock block, a reset base frame, a reset spring, and a slotted electromagnetic tube. The rear part of the left side of the left connecting rod is fixedly connected with the second transmission connecting rod. The left part of the second transmission connecting rod is fixedly connected with the locking disc. The lower side of the left part of the fixed back frame is slidably connected with the reset base frame. The left side surface of the reset base frame is fixedly connected with the locking vertical plate. The upper part of the locking vertical plate is fixedly connected with the positioning lock block. The positioning lock block is inserted into the locking disc. The upper and lower parts between the right part of the reset base frame and the inside of the fixed back frame are symmetrically connected with reset springs. The left part of the lower reversing horizontal shaft is rotatably sleeved with a slotted electromagnetic tube. The slotted electromagnetic tube is in magnetic contact with the lower reversing horizontal shaft. The slotted electromagnetic tube is threadedly connected with the locking vertical plate.

3. A liquid crystal display screen capable of controlling the viewing angle according to claim 2, wherein, it further includes a dust-proof mechanism for dust-proof protection. The dust-proof mechanism includes a dust-proof rubber sleeve and a rubber fixing frame. Four rubber fixing frames are evenly and spacedly fixedly connected between the fixed back frame and the liquid crystal display screen. A dust-proof rubber sleeve for dust-proof protection is fixedly connected between the four rubber fixing frames.

4. A liquid crystal display screen capable of controlling the viewing angle according to claim 3, wherein, it further includes an auxiliary lighting mechanism for relieving visual fatigue. The auxiliary lighting mechanism includes a positioning bottom plate, a limit rotating shaft, and an eye protection lamp. The upper part of the liquid crystal display screen is rotatably connected with the limit rotating shaft. The middle part of the limit rotating shaft is fixedly connected with the positioning bottom plate. The lower part of the positioning bottom plate is connected with an eye protection lamp for relieving visual fatigue.

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