Backlight module and liquid crystal display

Abstract

The present invention belongs to the field of liquid crystal display technology, and in particular, relates to a backlight module and a liquid crystal display, comprising an outer frame, wherein a substrate, a light guide plate, a diffusion film, a prism film and two LED light strips are fixedly installed inside the outer frame, wherein the substrate is fixedly installed on the inner lower side of the outer frame, the light guide plate is arranged above the substrate, and the diffusion film and the prism film are both arranged above the light guide plate, and the diffusion film is located between the prism film and the diffusion film, and the inner walls of the two opposite sides of the outer frame are provided with fixing grooves, and the two LED light strips are both installed inside the corresponding fixing grooves, and the light-emitting surfaces of the two LED light strips are facing the light guide plate. The present invention can improve the light-emitting uniformity of the light-emitting surface of the side-entry backlight module, and can fill the surface of the prism film with gas protection to prevent it from aging, and can automatically adjust the pressure of the protective gas based on the internal heat of the backlight module to prevent the backlight module from affecting the light-emitting effect due to thermal expansion, and can also assist the backlight module in heat dissipation and cooling.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid crystal display, and in particular relates to a backlight module and a liquid crystal display. Background Art

[0002] Liquid crystal display is a widely used display device, and one of its core components is the backlight module. Liquid crystal itself does not emit light and needs to rely on the backlight module to provide light source. The backlight module uses components such as light guide plates, diffusion films, and prism films to even out and enhance the light from the sides or bottom, providing a stable and uniform backlight source for the LCD panel, allowing the LCD display to present clear and bright images, playing a key role in the display effect.

[0003] At present, backlight modules are mainly divided into side-entry type and direct-down type. The side-entry type refers to the position of the light source at the side of the light guide plate, and the light is conducted and diffused by the light guide plate to realize light output. Its advantage is that it is thin and light, and can effectively reduce the thickness of the display. It is suitable for products with high requirements for thin and light appearance, such as notebook computer screens. The direct-down type refers to the distribution of the light source on the back plate. This method can provide higher brightness and better contrast. It has obvious advantages when displaying large-size pictures and can present more delicate image details and rich colors. For example, a direct-down backlight module and liquid crystal display disclosed in patent announcement number CN109116627A;

[0004] For large-size LCD displays, direct-type backlight modules have the advantages of zone control, high contrast, energy saving and consumption reduction, but they require multiple LED light sources to be evenly distributed on the back panel, the overall cost is high, the assembly is complex, and the increase in light sources will increase the possibility of damage. Although edge-entry light sources are low-cost and space-saving, for large-size LCD screens, edge-entry light sources are far from the center of the light guide plate, and light is lost when propagating on the light guide plate. There is more loss when the light is propagated to the center of the light guide plate, which will cause the light intensity in the center of the large-size LCD screen to be lower than that near the light source, resulting in light deviation, which can easily cause eye fatigue after long-term viewing. Summary of the invention

[0005] The object of the present invention is to provide a backlight module and a liquid crystal display in view of the above problems.

[0006] To achieve the above object, the present invention adopts the following technical solutions: a backlight module, comprising an outer frame, wherein a substrate, a light guide plate, a diffusion film, a prism film and two LED light strips are fixedly installed inside the outer frame, wherein the substrate is fixedly installed on the inner lower side of the outer frame, the light guide plate is arranged above the substrate, and the diffusion film and the prism film are both arranged above the light guide plate, and the diffusion film is located between the prism film and the diffusion film, the inner walls of two opposite sides of the outer frame are both provided with fixing grooves, and the two LED light strips are both installed inside the corresponding fixing grooves, and the light emitting surfaces of the two LED light strips are both facing the light guide plate, and further comprising:

[0007] A lower quartz glass plate is arranged above the substrate and fixedly mounted on the bottom of the light guide plate, a reflective film is fixedly mounted on the bottom of the lower quartz glass plate, and the upper end surface of the reflective film and the bottom of the lower quartz glass plate are both provided with a straight portion and two inclined portions, and the straight portion is located between the two inclined portions;

[0008] A protection unit, installed inside the outer frame;

[0009] The voltage regulating unit is installed inside the protection unit.

[0010] Preferably, the straight portion and the two inclined portions have the same length, and the two inclined portions refract light toward the straight portion.

[0011] Preferably, the protection unit includes a frame-type mounting groove opened on the top of the outer frame, and an upper quartz glass plate is fixedly installed inside the frame-type mounting groove, a frame-type pressure strip is fixedly installed on the top of the outer frame, and the frame-type pressure strip is used to fix the upper quartz glass plate, a gap is arranged between the upper quartz glass plate and the prism film, a plurality of air grooves are opened inside the outer frame, and a groove wall of each air groove is opened with an air vent connected to the gap, a piston plate is slidably arranged inside each of the air grooves, and the interior of each of the air grooves above the piston plate and the interior of the gap are filled with protective gas, a gas injection hole is opened on the upper side of the groove wall of one of the air grooves, and a sealing column is inserted into the gas injection hole.

[0012] Preferably, the pressure regulating unit includes a sealing end plate detachably mounted on the notch of each air groove, two electromagnetic columns are fixedly mounted on the end face of each sealing end plate, two permanent magnet blocks are fixedly mounted on the lower end of each piston plate, and each permanent magnet block is coaxially designed with the corresponding electromagnetic column, two supporting springs are fixedly arranged between the sealing end plate and the piston plate, and a resistance adjustment component and a heat dissipation component are installed inside each air groove.

[0013] Preferably, each of the resistance adjustment components comprises an insulating spacer fixedly mounted on the bottom of the gas groove, and a thermistor is fixedly mounted on the bottom of the insulating spacer, and each of the thermistors and the electromagnetic column is connected in series.

[0014] Preferably, each of the heat dissipation components comprises a heat-conducting aluminum plate fixedly plugged into the wall of the air groove, and a plurality of heat dissipation grooves are formed on the side wall of the heat-conducting aluminum plate away from the air groove.

[0015] Preferably, an insulating sleeve is fixedly installed on the top of one of the sealing end plates, and an insulating column is arranged on the inner side of the insulating sleeve, the insulating column is fixedly installed on the bottom of the piston plate on the same side, a conductive column is fixedly installed on the end of the insulating column away from the piston plate, a conductive ring is fixedly installed on the inner upper side of the insulating sleeve, the inner wall of the conductive ring is in sliding contact with the side wall of the insulating column, the conductive column and the insulating column have the same diameter, and the gas pressure of the protective gas is 1.3 standard atmospheres.

[0016] A liquid crystal display, comprising the backlight module as described above, and further comprising:

[0017] A liquid crystal module is arranged on the light-emitting surface of the upper quartz glass plate;

[0018] A front panel assembly is arranged on a side of the liquid crystal module away from the outer frame;

[0019] The back shell assembly is arranged on a side of the outer frame away from the front panel assembly. A control mainboard is installed inside the back shell assembly. The thermistor and the electromagnetic column are electrically connected to the control mainboard. The conductive column and the conductive ring are electrically connected to the control mainboard.

[0020] Compared with the existing technology, the advantages of a backlight module and a liquid crystal display are:

[0021] 1. Through the cooperation of the outer frame, substrate, light guide plate, diffusion film, prism film, LED light strip and fixing groove, a light source can be provided for the liquid crystal display. Through the cooperation of the lower quartz glass plate, reflective film, straight portion and two inclined portions, and by setting an inclined reflective surface at the bottom of the light guide plate near the two light sources, part of the light near the light source is refracted to the center of the liquid crystal display. Through the light transfer, the light intensity at the light source can be reduced, and the light intensity at the center of the liquid crystal display can be increased, thereby improving the light uniformity of the light-emitting surface of the edge-entry backlight module.

[0022] 2. Through the protection unit, the surface of the prism film can be filled with gas for protection to prevent it from long-term contact with the air and accelerate the aging of the prism film. Through the cooperation of the voltage regulating unit and the resistance regulating component, the pressure of the protective gas can be automatically adjusted based on the heat inside the backlight module to avoid the deviation of light projection caused by thermal expansion of the diffusion film, prism film, etc. when the heat is too high, thereby improving the luminous effect.

[0023] 3. The heat dissipation component can assist the backlight module in heat dissipation and cooling. The cooperation of the insulating sleeve, insulating column, conductive column and conductive ring can perform a sealing self-check every time the LCD display is started, thereby promptly reminding personnel of sealing failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a backlight module and a liquid crystal display provided by the present invention;

[0025] Figure 2 It is a cross-sectional structural schematic diagram of a backlight module and a backlight module of a liquid crystal display provided by the present invention;

[0026] Figure 3 It is a partial structural schematic diagram of a backlight module and a lower quartz glass plate and a reflective film of a liquid crystal display provided by the present invention;

[0027] Figure 4 The present invention provides a backlight module and a liquid crystal display. Figure 2 A magnified view of the structure of part A;

[0028] Figure 5 It is a schematic diagram of the internal structure of a backlight module and an air slot of a liquid crystal display provided by the present invention from a side view;

[0029] Figure 6 The present invention provides a backlight module and a liquid crystal display. Figure 5 A magnified view of the structure of part B.

[0030] In the figure: 1 outer frame, 2 substrate, 3 light guide plate, 4 diffusion film, 5 prism film, 6 LED light bar, 7 fixing groove, 8 lower quartz glass plate, 9 reflective film, 10 straight part, 11 inclined part, 12 protection unit, 121 frame mounting groove, 122 upper quartz glass plate, 123 frame pressure strip, 124 gap, 125 air groove, 126 vent hole, 127 piston plate, 128 injection hole, 129 blocking column, 13 voltage regulating unit, 131 sealing end plate, 132 electromagnetic column, 133 permanent magnet block, 134 support spring, 14 resistance adjustment component, 141 insulating pad, 142 thermistor, 15 heat dissipation component, 151 thermal conductive aluminum plate, 152 heat dissipation groove, 16 insulating sleeve, 17 insulating column, 18 conductive column, 19 conductive ring, 20 liquid crystal module, 21 front panel component, 22 back shell component, 23 control main board. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] like Figure 1-Figure 6As shown, a backlight module includes an outer frame 1, a substrate 2, a light guide plate 3, a diffusion film 4, a prism film 5 and two LED light strips 6 are fixedly installed inside the outer frame 1, the substrate 2 is fixedly installed on the inner lower side of the outer frame 1, the light guide plate 3 is arranged above the substrate 2, and the diffusion film 4 and the prism film 5 are both arranged above the light guide plate 3, and the diffusion film 4 is located between the prism film 5 and the diffusion film 4, the inner walls of two opposite sides of the outer frame 1 are both provided with fixing grooves 7, and the two LED light strips 6 are both installed in the corresponding fixing grooves 7, and the two LED light strips 6, the light-emitting surfaces of which are all facing the light guide plate 3, and further comprising: a lower quartz glass plate 8, which is arranged above the substrate 2 and fixedly mounted on the bottom of the light guide plate 3, a reflective film 9 being fixedly mounted on the bottom of the lower quartz glass plate 8, a straight portion 10 and two inclined portions 11 being arranged on the upper end surface of the reflective film 9 and the bottom of the lower quartz glass plate 8, the straight portion 10 being between the two inclined portions 11, the straight portion 10 and the two inclined portions 11 being the same in length, and the two inclined portions 11 refracting light toward the straight portion 10.

[0033] The protection unit 12 is installed inside the outer frame 1. The protection unit 12 includes a frame-shaped mounting groove 121 opened at the top of the outer frame 1, and an upper quartz glass plate 122 is fixedly installed inside the frame-shaped mounting groove 121. A frame-shaped pressure strip 123 is fixedly installed on the top of the outer frame 1, and the frame-shaped pressure strip 123 is used to fix the upper quartz glass plate 122. A gap 124 is set between the upper quartz glass plate 122 and the prism film 5. A plurality of air grooves 125 are opened inside the outer frame 1, and each air groove 125 The groove walls are all provided with air holes 126 connected with the gaps 124, and a piston plate 127 is slidably arranged inside each air groove 125. The interior of each air groove 125 above the piston plate 127 and the interior of the gaps 124 are filled with protective gas. An air injection hole 128 is provided on the upper side of the groove wall of one of the air grooves 125, and a sealing column 129 is inserted into the interior of the air injection hole 128, so that protective gas can be injected into the air groove 125 and the interior of the gaps 124 through the air injection hole 128.

[0034] The voltage regulating unit 13 is installed inside the protection unit 12. The voltage regulating unit 13 includes a sealing end plate 131 which is detachably installed on the notch of each air groove 125. Two electromagnetic columns 132 are fixedly installed on the end face of each sealing end plate 131. Two permanent magnet blocks 133 are fixedly installed on the lower end of each piston plate 127. Each permanent magnet block 133 is coaxially designed with the corresponding electromagnetic column 132. Two supporting springs 134 are fixedly arranged between the sealing end plate 131 and the piston plate 127. A resistance adjustment component 14 and a heat dissipation component 15 are installed inside each air groove 125. After the electromagnetic column 132 is energized, under the effect of like-charge repulsion, the electromagnetic column 132 will repel the permanent magnet block 133.

[0035] Each resistance adjustment component 14 includes an insulating spacer 141 fixedly installed at the bottom of the air groove 125, and a thermistor 142 is fixedly installed at the bottom of the insulating spacer 141. Each thermistor 142 and the electromagnetic column 132 are connected in series. Within a certain temperature range, the resistance of the thermistor 142 decreases as the temperature increases.

[0036] Each heat dissipation assembly 15 includes a heat conductive aluminum plate 151 fixedly plugged into the wall of the air groove 125 . The side wall of the heat conductive aluminum plate 151 away from the air groove 125 is provided with a plurality of heat dissipation grooves 152 . The heat dissipation grooves 152 can increase the heat dissipation efficiency of the surface of the heat conductive aluminum plate 151 .

[0037] An insulating sleeve 16 is fixedly installed on the top of one of the sealing end plates 131, and an insulating column 17 is arranged on the inner side of the insulating sleeve 16. The insulating column 17 is fixedly installed on the bottom of the piston plate 127 on the same side. A conductive column 18 is fixedly installed on the end of the insulating column 17 away from the piston plate 127. A conductive ring 19 is fixedly installed on the upper side of the inner part of the insulating sleeve 16. The inner wall of the conductive ring 19 is in sliding contact with the side wall of the insulating column 17. The conductive column 18 has the same diameter as the insulating column 17. The gas pressure of the protective gas is 1.3 standard atmospheres. After the protective gas is filled, the piston plate 127 will compress the support spring 134 so that the conductive ring 19 and the conductive column 18 will not contact.

[0038] A liquid crystal display, comprising a backlight module, and further comprising:

[0039] The liquid crystal module 20 is arranged on the light-emitting surface of the upper quartz glass plate 122, the front panel assembly 21 is arranged on the side of the liquid crystal module 20 away from the outer frame 1, the back shell assembly 22 is arranged on the side of the outer frame 1 away from the front panel assembly 21, and a control mainboard 23 is installed inside the back shell assembly 22, the thermistor 142 and the electromagnetic column 132 are both electrically connected to the control mainboard 23, and the conductive column 18 and the conductive ring 19 are both electrically connected to the control mainboard 23.

[0040] The operating principle of the present invention is now described as follows: when the liquid crystal display is started, the control mainboard 23 will receive a start-up instruction, and the control mainboard 23 will control the two LED light strips 6 to work. The light emitted by the two LED light strips 6 will irradiate the light guide plate 3, and the light will be projected to the diffusion film 4 after being refracted inside the light guide plate 3. The diffusion film 4 can scatter the light to make the distribution of the light more uniform. The light passing through the diffusion film 4 will be projected to the prism film 5, and the prism film 5 will collect and redirect the originally divergent light to make the light concentrated within a specific angle range for emission (the surface of the prism film 5 has many tiny prism structures, which can refract and reflect the light. When the light is transmitted from the diffusion film 4, the prism structure can collect and direct the light, so that the light is concentrated on the light incident surface of the liquid crystal module 20, thereby improving the utilization of the light). When the light in the light guide plate 3 is projected to its bottom, In addition to most of the light being reflected upward, some of the light will be emitted from the bottom of the light guide plate 3. The light emitted from the bottom of the light guide plate 3 will enter the lower quartz glass plate 8 and be projected onto the reflective film 9. When the light is projected onto the two inclined portions 11 of the reflective film 9, the light will move toward the straight portion 10 under the action of the inclined portions 11 to refract the light, until the light is projected onto the straight portion 10. Under the action of the reflection of the straight portion 10, the light will be projected upward. Since the inclined portions 11 on both sides can refract the light toward the straight portion 10, part of the light emitted from the light sources close to the two sides can be gathered toward the middle, so that the light intensity at the middle position of the light guide plate 3 is increased, while the light intensity on both sides of the light guide plate 3 is weakened, thereby making the light guide plate 3 emit light more evenly, improving the light uniformity of a large-size liquid crystal display screen (generally referring to a liquid crystal display screen with a length direction greater than 0.8 meters), and reducing the difference between the light intensity on both sides and the light intensity in the middle position.

[0041] Secondly, during the operation of the backlight module, when the LED light bar 6 continues to operate for a long time, the heat inside the backlight module will accumulate, causing the temperature of the backlight module to rise. When the temperature rises, the resistance of the thermistor 142 will decrease synchronously (the resistance of the thermistor 142 decreases with the increase of temperature within the range of -10°C to 150°C). At this time, the resistance of the series circuit of each thermistor 142 and each electromagnetic column 132 decreases, so the current intensity passing into the electromagnetic column 132 increases. At this time, the magnetic force generated by the electromagnetic column 132 increases, and under the effect of like repulsion, the magnetic repulsion force generated by the electromagnetic column 132 on the permanent magnet block 133 increases, so the permanent magnet block 133 will be repelled to drive the piston plate 127 to move upward, and when the piston plate 127 moves upward, it will push the upper side of the gas groove 125. The space of the protective gas is squeezed, so the space for containing the protective gas is reduced at this time, so that the air pressure on the upper side of the air groove 125 and the inside of the gap 124 increases. As the temperature inside the backlight module increases, the diffusion film 4, the prism film 5, etc. will experience thermal expansion due to the increase in temperature, and the increase in air pressure can apply downward pressure to the diffusion film 4, the prism film 5, so the downward pressure can balance the thermal expansion force generated by the diffusion film 4, the prism film 5, etc., avoid deformation of the diffusion film 4, the prism film 5, etc. due to thermal expansion, and ensure the light processing effect of the diffusion film 4, the prism film 5, etc., and because the gap 124 is formed between the upper quartz glass plate 122 and the prism film 5, and the gap 124 is filled with protective gas, it can prevent the prism film 5 from directly contacting the external air, thereby delaying its aging speed as much as possible;

[0042] Secondly, when the temperature inside the backlight film group increases, the upward movement of the piston plate 127 causes the gas pressure inside the gas groove 125 to increase. At this time, the gap between the gases decreases due to the gathering of the protective gas, so the heat transfer efficiency of the gas increases. At this time, due to the increase in heat conduction efficiency, the heat can be quickly conducted to the outside through the heat-conducting aluminum plate 151 and dissipated, so that when the temperature of the backlight module increases, the heat dissipation efficiency increases simultaneously;

[0043] Finally, each time the control main board 23 receives a start command, it will supply power to the connection circuit of the conductive column 18 and the conductive ring 19 for 5 seconds. Since the pressure of the protective gas is 1.3 standard atmospheric pressures, the conductive column 18 is at the lower side of the conductive ring 19, and the conductive column 18 is not in contact with the conductive ring 19. When the seal fails at the upper quartz glass plate 122, the gas groove 125 and other positions, the protective gas escapes and the pressure of the protective gas decreases. At this time, the piston plate 127 will gradually move upward under the action of the support spring 134. Therefore, the piston plate 127 will drive the conductive column 18 to move upward through the insulating column 17, so that The conductive column 18 is in contact with the conductive ring 19, so within 5 seconds when the control main board 23 supplies power to the connection circuit between the conductive column 18 and the conductive ring 19, the connection circuit between the conductive ring 19 and the conductive column 18 and the control main board 23 is connected. At this time, the connection circuit will feedback the conduction electrical signal to the control main board 23, so the control main board 23 will send a prompt message to the user. For example, the control main board 23 controls the indicator light to light up, thereby reminding the user that the backlight module has a sealing failure. At this time, the user should repair the backlight module in time, refill the protective gas, and continue to protect the prism film 5, etc.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A backlight module, comprising an outer frame (1), wherein a substrate (2), a light guide plate (3), a diffusion film (4), a prism film (5) and two LED light strips (6) are fixedly installed inside the outer frame (1), wherein the substrate (2) is fixedly installed on the lower side of the inner part of the outer frame (1), the light guide plate (3) is arranged above the substrate (2), and the diffusion film (4) and the prism film (5) are both arranged above the light guide plate (3), and the diffusion film (4) is located between the prism film (5) and the diffusion film (4), the inner walls of two opposite sides of the outer frame (1) are both provided with fixing grooves (7), and the two LED light strips (6) are both installed inside the corresponding fixing grooves (7), and the light emitting surfaces of the two LED light strips (6) are both facing the light guide plate (3), characterized in that: Also includes: A lower quartz glass plate (8) is arranged above the substrate (2), and the lower quartz glass plate (8) is fixedly mounted on the bottom of the light guide plate (3); a reflective film (9) is fixedly mounted on the bottom of the lower quartz glass plate (8); the upper end surface of the reflective film (9) and the bottom of the lower quartz glass plate (8) are both provided with a straight portion (10) and two inclined portions (11); the straight portion (10) is located between the two inclined portions (11); A protection unit (12) installed inside the outer frame (1); A voltage regulating unit (13) installed inside the protection unit (12); The straight portion (10) and the two inclined portions (11) have the same length, and the two inclined portions (11) refract light in the direction of the straight portion (10); The protection unit (12) comprises a frame-shaped mounting groove (121) formed on the top of the outer frame (1), an upper quartz glass plate (122) being fixedly mounted inside the frame-shaped mounting groove (121), a frame-shaped pressure strip (123) being fixedly mounted on the top of the outer frame (1), and the frame-shaped pressure strip (123) being used to fix the upper quartz glass plate (122), a gap (124) being provided between the upper quartz glass plate (122) and the prism film (5), and a plurality of air grooves (124) being provided inside the outer frame (1). 5), and the groove wall of each gas groove (125) is provided with a vent hole (126) connected to the gap (124), and a piston plate (127) is slidably arranged inside each gas groove (125), and the position above the piston plate (127) inside each gas groove (125) and the inside of the gap (124) are filled with protective gas, and a gas injection hole (128) is provided on the upper side of the groove wall of one of the gas grooves (125), and a blocking column (129) is inserted into the gas injection hole (128).

2. The backlight module according to claim 1, characterized in that: The pressure regulating unit (13) comprises a sealing end plate (131) detachably mounted on a notch of each gas groove (125); two electromagnetic columns (132) are fixedly mounted on the end surface of each sealing end plate (131); two permanent magnet blocks (133) are fixedly mounted on the lower end of each piston plate (127); and each permanent magnet block (133) is coaxially designed with the corresponding electromagnetic column (132); two supporting springs (134) are fixedly arranged between the sealing end plate (131) and the piston plate (127); and a resistance regulating component (14) and a heat dissipation component (15) are installed inside each gas groove (125).

3. The backlight module according to claim 2, characterized in that: Each of the resistance adjustment components (14) comprises an insulating pad (141) fixedly mounted on the bottom of the air groove (125), and a thermal element (142) is fixedly mounted on the bottom of the insulating pad (141), and each of the thermal elements (142) and the electromagnetic column (132) are connected in series.

4. The backlight module according to claim 3, characterized in that: Each of the heat dissipation components (15) comprises a heat-conducting aluminum plate (151) fixedly plugged into a groove wall of the air groove (125), and a plurality of heat dissipation grooves (152) are provided on a side wall of the heat-conducting aluminum plate (151) away from the air groove (125).

5. The backlight module according to claim 4, characterized in that: An insulating sleeve (16) is fixedly mounted on the top of one of the sealing end plates (131), and an insulating column (17) is arranged on the inner side of the insulating sleeve (16); the insulating column (17) is fixedly mounted on the bottom of the piston plate (127) on the same side; a conductive column (18) is fixedly mounted on the end of the insulating column (17) away from the piston plate (127); a conductive ring (19) is fixedly mounted on the inner upper side of the insulating sleeve (16); the inner wall of the conductive ring (19) is in sliding contact with the side wall of the insulating column (17); the conductive column (18) and the insulating column (17) have the same diameter; and the pressure of the protective gas is 1.3 standard atmospheric pressures.

6. A liquid crystal display, characterized in that: The backlight module according to claim 5 further comprises: A liquid crystal module (20) arranged on the light-emitting surface of the upper quartz glass plate (122); A front panel assembly (21), arranged on a side of the liquid crystal module (20) away from the outer frame (1); A back shell component (22) is arranged on a side of the outer frame (1) away from the front panel component (21), and a control main board (23) is installed inside the back shell component (22); the thermistor (142) and the electromagnetic column (132) are both electrically connected to the control main board (23), and the conductive column (18) and the conductive ring (19) are both electrically connected to the control main board (23).

Images