Adjustable peep-proof display

Abstract

The utility model relates to an adjustable peep-proof displayer which comprises a liquid crystal display panel, a backlight module assembly located below the liquid crystal display panel and a back plate supporting the liquid crystal display panel and the backlight module assembly, and the backlight module assembly comprises a first backlight module, a second backlight module and a peep-proof optical assembly. The first backlight module is located below the second backlight module, the peep-proof optical assembly is arranged between the first backlight module and the second backlight module, and the first backlight module and the second backlight module respectively comprise a first light source and a second light source. The first light source and the second light source are arranged on the side wall of the back plate, and the first light source and the second light source can be independently driven and controlled, so that the liquid crystal display panel is in a peep-proof and normal display state. The on-off state of the first light source and the second light source is controlled by driving, and the anti-peeping function of the display and automatic switching of the anti-peeping state are realized under the condition that the brightness of the display is not influenced by matching with the optical effect of the first backlight module, the second backlight module and the anti-peeping optical component.

Description

Technical Field

[0001] The utility model relates to the technical field of display, in particular to an adjustable anti-peeping display. Background Art

[0002] As the social material level improves, more electronic display products enter people's lives and are used in various life scenarios. When using display devices, users do not want others to be able to peek at the displayed content, so display devices with anti-peeping functions are becoming more and more popular among users. In addition, the use of anti-peeping display devices in certain life scenarios can improve safety assurance. For example, the display screen in the co-pilot seat of a car needs to prevent the main driver from peeping when driving to avoid distracting the driver's attention and ensure driving safety; when parking, it needs to switch to sharing mode so that the main and co-pilot drivers can clearly see the displayed content.

[0003] In the prior art, traditional anti-peeping displays achieve the anti-peeping function by adding an anti-peeping film in the backlight module or on the screen surface. However, there are only two states: anti-peeping and non-anti-peeping. The two states cannot be freely switched according to actual usage needs. For example, during normal use, the display is not anti-peeping and is in a sharing state; when there is a need for anti-peeping, the display can be adjusted to be in an anti-peeping state.

[0004] In other prior arts, a combination of a privacy film and an electronic dimming film is provided in the backlight module to achieve dynamic switching between privacy protection and non-privacy protection states. However, this method affects the brightness of the display, so the brightness of the display needs to be increased by increasing the number or power of light sources, thereby increasing energy consumption. Utility Model Content

[0005] In view of the above-mentioned problems, the purpose of the present invention is to provide an adjustable anti-peeping display, which is used to realize the anti-peeping function of the display and the free switching of the anti-peeping state without affecting the brightness of the display.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] An adjustable anti-peeping display comprises a liquid crystal display panel, a backlight module assembly located below the liquid crystal display panel, and a back plate supporting the liquid crystal display panel and the backlight module assembly, characterized in that the backlight module assembly comprises a first backlight module, a second backlight module and an anti-peeping optical assembly, the first backlight module is located below the second backlight module, the anti-peeping optical assembly is arranged between the first backlight module and the second backlight module, the first backlight module and the second backlight module respectively comprise a first light source and a second light source, the first light source and the second light source are arranged on the side wall of the back plate, and the first light source and the second light source can be driven and controlled separately to make the liquid crystal display panel present an anti-peeping and normal display state.

[0008] By driving and controlling the on and off states of the first light source and the second light source, and cooperating with the optical effects of the first backlight module, the second backlight module and the anti-peeping optical component, the anti-peeping function of the display and the automatic switching of the anti-peeping state are realized. When the first light source is in a constant on state and the second light source is in an off state, the light passing through the first backlight module is adjusted by the anti-peeping optical component to a narrow viewing angle light and enters the second backlight module. The narrow viewing angle light is slightly disturbed by the second backlight module and continues to be emitted from the second backlight module as a narrow viewing angle light. The person in front of the display can see the content of the display liquid crystal display panel, so the display is in a left and right anti-peeping state. When the first light source is in an off state and the second light source is in a constant on state, the light passing through the second backlight module is adjusted to be emitted along a specific viewing angle direction, so the display liquid crystal display panel is visible in a specific viewing angle range, and the rest of the viewing angle range is anti-peeping. When the first light source and the second light source are in a constant on state, the light passing through the second backlight module is in a superposition state of the light of the first light source and the light of the second light source, so the display is in a sharing mode, which is only anti-peeping for a specific viewing angle range; at the same time, the brightness of the display liquid crystal display panel is increased, and the overall visual viewing effect is improved.

[0009] Furthermore, the privacy-preventing optical component is a privacy film, the privacy film is provided with a louver microstructure layer, the louver microstructure layer includes a plurality of light-blocking areas and light-transmitting areas arranged in parallel, and the light-transmitting area is located between the two light-blocking areas.

[0010] The light emitted from the first backlight module has poor collimation. The light is adjusted through the shutter microstructure layer of the privacy film, which can limit the light to a certain small angle and emit light with a narrow viewing angle. People in front of the display can see the display contents, thereby achieving the purpose of left and right privacy protection of the display.

[0011] Furthermore, the first backlight module also includes a reflective sheet, a first light guide plate, a first diffuser, and a brightness enhancement sheet which are stacked in sequence. The reflective sheet is located on the bottom surface of the back plate, and the brightness enhancement sheet is located below the anti-peep optical component.

[0012] The reflective sheet is used to reflect the light emitted from the bottom of the first light guide plate to improve the utilization rate of the light; the first light guide plate converts the light emitted by the first light source into a plane light, the first diffuser adjusts the light emitted from the first light guide plate to make it more uniform; the light enhancement sheet makes the light more concentrated, thereby improving the brightness. The adjusted light enters the anti-peeping optical component in the form of a more uniform plane light, and reduces the loss of light, thereby improving the utilization rate of light.

[0013] Furthermore, the brightness enhancement sheet includes an upper brightness enhancement sheet and a lower brightness enhancement sheet, and the upper brightness enhancement sheet and the lower brightness enhancement sheet are an orthogonal combination.

[0014] The upper and lower brightness enhancement sheets are refractive brightness enhancement sheets. The two sheets are used orthogonally to produce a deflection effect, so that the light emitted from the first diffusion sheet is concentrated toward the normal after passing through the upper and lower brightness enhancement sheets, thereby increasing the brightness of the light.

[0015] Furthermore, the brightness enhancement sheet is a composite brightness enhancement sheet.

[0016] The composite brightness enhancement sheet is a fully reflective brightness enhancement sheet, which has the function of concentrating the light toward the normal line after passing through the composite brightness enhancement sheet, thereby increasing the brightness of the light.

[0017] Furthermore, the first light source is located on a side of the first light guide plate.

[0018] The light emitted by the first light source enters the first light guide plate from the side, is reflected by the reflection points printed on the first light guide plate, and is emitted as a plane light.

[0019] Furthermore, the second backlight module also includes a second light guide plate and a second optical film which are stacked in sequence, the second light guide plate is located above the anti-peep optical component, and the second optical film is located below the liquid crystal display panel.

[0020] The second light guide plate converts the light emitted by the second light source into light emitted in a specific viewing direction; after passing through the second optical film, the emission direction of the light remains unchanged.

[0021] Furthermore, the second optical film includes one or a combination of a second diffuser or a reflective polarizing brightness enhancement film.

[0022] If the second optical film is set as a second diffuser, it adjusts the light emitted from the second light guide plate to make it more uniform and avoid the generation of light spots; if the second optical film is set as a reflective polarized brightening film, it adjusts the light emitted from the second light guide plate to make it brighter, the brightness of the liquid crystal display panel of the display is improved, and the visual effect is better; if the second optical film is set as a combination of a second diffuser and a reflective polarized brightening film, the functions of both are taken into account.

[0023] Furthermore, the second light source is located on a side of the second light guide plate.

[0024] The light emitted by the second light source enters the second light guide plate from the side, is reflected by the special dot structure printed on the second light guide plate, and is emitted along a specific viewing angle direction.

[0025] Furthermore, the adjustable anti-peeping display also includes a driver, and the driver is used to drive and control the on and off states of the first light source and the second light source.

[0026] By controlling the first light source and the second light source through the driver, the on and off states of the first light source and the second light source can be freely combined, thereby controlling the free switching of the anti-peeping state of the display.

[0027] Compared with the prior art, the beneficial effects of the utility model are:

[0028] By driving and controlling the on and off states of the first light source and the second light source, and cooperating with the optical effects of the first backlight module, the second backlight module and the anti-peeping optical component, the anti-peeping function of the display and the automatic switching of the anti-peeping state are realized. When the first light source is in a constant on state and the second light source is in an off state, the light passing through the first backlight module is adjusted by the anti-peeping optical component to a narrow viewing angle light and enters the second backlight module. The narrow viewing angle light is slightly disturbed by the second backlight module and continues to be emitted from the second backlight module as a narrow viewing angle light. The person in front of the display can see the content of the display liquid crystal display panel, so the display is in a left and right anti-peeping state. When the first light source is in an off state and the second light source is in a constant on state, the light passing through the second backlight module is adjusted to be emitted along a specific viewing angle direction, so the display liquid crystal display panel is visible in a specific viewing angle range, and the rest of the viewing angle range is anti-peeping. When the first light source and the second light source are in a constant on state, the light passing through the second backlight module is in a superposition state of the light of the first light source and the light of the second light source, so the display is in a sharing mode, which is only anti-peeping for a specific viewing angle range; at the same time, the brightness of the display liquid crystal display panel is increased, and the overall visual viewing effect is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural diagram of an adjustable anti-peeping display according to an embodiment of the present utility model.

[0030] Figure 2 This is a structural diagram of an adjustable anti-peeping display backlight module assembly according to an embodiment of the utility model.

[0031] Figure 3 This is a structural diagram of a first backlight module of an adjustable anti-peeping display according to an embodiment of the utility model.

[0032] Figure 4 This is a structural diagram of an adjustable second backlight module of an anti-peeping display according to an embodiment of the utility model.

[0033] Figure 5 This is a structural diagram of an anti-peeping optical component of an adjustable anti-peeping display according to an embodiment of the utility model.

[0034] Figure 6 This is a schematic diagram of light propagation of an adjustable anti-peeping display with only the first light source emitting light according to an embodiment of the utility model.

[0035] Figure 7 This is a schematic diagram of light propagation of an adjustable anti-peeping display with only the second light source emitting light according to an embodiment of the utility model.

[0036] Figure 8 This is a schematic diagram of the propagation of light emitted by the first and second light sources of an adjustable anti-peeping display according to an embodiment of the utility model.

[0037] Illustrations: 1-liquid crystal display panel, 2-backlight module assembly, 3-back plate, 21-first backlight module, 22-anti-peeping optical assembly, 23-second backlight module, 211-reflective sheet, 212-first light guide plate, 213-first diffuser, 214-brightness enhancement sheet, 215-first light source, 231-second light guide plate, 232-second optical film, 233-second light source, 221-light-transmitting area, 222-light-blocking area. DETAILED DESCRIPTION

[0038] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0039] like Figures 1 to 8 As shown, in a preferred embodiment, the utility model provides an adjustable anti-peeping display, including a liquid crystal display panel 1, a backlight module assembly 2 located below the liquid crystal display panel 1, and a back plate 3 supporting the liquid crystal display panel and the backlight module assembly, characterized in that the backlight module assembly 2 includes a first backlight module 21, a second backlight module 23 and an anti-peeping optical assembly 22, the first backlight module 21 is located below the second backlight module 23, the anti-peeping optical assembly 22 is arranged between the first backlight module 21 and the second backlight module 23, the first backlight module 21 and the second backlight module 23 respectively include a first light source 215 and a second light source 233, the first light source 215 and the second light source 233 are arranged on the side wall of the back plate 3, and the first light source 215 and the second light source 233 can be driven and controlled separately to make the liquid crystal display panel 1 present an anti-peeping and normal display state.

[0040] It can be seen from the above technical solution that by driving and controlling the on and off states of the first light source 215 and the second light source 233, in conjunction with the optical effects of the first backlight module 21, the second backlight module 23 and the anti-peeping optical component 22, the automatic switching of the anti-peeping and anti-peeping states of the display is realized. When the first light source 215 is in a constant on state and the second light source 233 is in an off state, the light passing through the first backlight module 21 is adjusted by the anti-peeping optical component 22 to be a narrow viewing angle light and enters the second backlight module 23. The narrow viewing angle light is slightly disturbed by the second backlight module 23 and continues to be emitted from the second backlight module 23 as a narrow viewing angle light. The person in front of the display can see the content of the display liquid crystal display panel, so the display is in a left and right anti-peeping state. When the first light source 233 is in an off state and the second light source 215 is in a constant on state, the light passing through the second backlight module 23 is adjusted to be emitted along a specific viewing angle direction, so the display liquid crystal display panel is visible in a specific viewing angle range and anti-peeping in the rest of the viewing angle range. When the first light source 215 and the second light source 233 are in a constantly on state, the light passing through the second backlight module 23 is in a superimposed state of the light from the first light source 215 and the light from the second light source 233, so the display is in a sharing mode, which is only protected from peeping within a specific viewing angle range; at the same time, the brightness of the LCD panel of the display is increased, and the overall visual viewing effect is improved.

[0041] Please refer to Figure 2 , Figure 3The first backlight module 21 also includes a reflective sheet 211, a first light guide plate 212, a first diffuser 213, and a brightness enhancement sheet 214 which are stacked in sequence. The reflective sheet 211 is laid flat on the bottom surface of the back plate 3 to reflect the light into the first light guide plate 212, while preventing the back plate from leaking light and causing defective products. The first light guide plate 212 is laid flat on the reflective sheet 211, and regularly changing reflection points are printed on its bottom. The reflection points close to the light source are small and few in number, and the reflection points far away from the light source are large and many in number, so that part of the light with an incident angle less than the total reflection angle is emitted from the upper surface of the first light guide plate 212, converting the line light source into a plane light source. The first diffuser 213 is laid flat on the first light guide plate 212 to diffuse the light from the first light guide plate 212, so that it is more concentrated and evenly projected into the brightness enhancement sheet 214. The brightness enhancement sheet 214 is laid flat on the top of the first diffuser 213. In this example, the brightness enhancement sheet 214 is in the form of an orthogonal combination of an upper brightness enhancement sheet and a lower brightness enhancement sheet. The upper brightness enhancement sheet and the lower brightness enhancement sheet are refractive brightness enhancement sheets. The upper and lower sheets are used orthogonally to each other to produce a deflection effect, so that the light emitted from the first diffuser 213 is concentrated toward the normal after passing through the upper brightness enhancement sheet and the lower brightness enhancement sheet, thereby increasing the brightness of the light. In other possible embodiments, the brightness enhancement sheet 214 may be a fully reflective composite brightness enhancement sheet, which is not set in this application. The first light source 215 included in the first backlight module 21 is located on the side of the first light guide plate 212, and the center line of the light source is on the same horizontal plane as the center line of the side of the first light guide plate 212. The light emitted by the first light source 215 enters the first light guide plate 212 from the side, is reflected by the reflection points printed on the first light guide plate, and is emitted as a plane light. The adjusted light enters the anti-peeping optical component 22 in the form of more uniform plane light, which reduces the loss of light and improves the utilization rate of light.

[0042] Please refer to Figure 2 , Figure 5 , Figure 6 The anti-peeping optical component 22 is disposed between the first backlight module 21 and the second backlight module 23. In the present embodiment, the anti-peeping optical component 22 is a privacy film. The privacy film is provided with a louver microstructure layer, which includes a plurality of parallel light blocking areas 222 and light-transmitting areas 221. The light-transmitting area 221 is located between the two light blocking areas 222. The light-transmitting area 221 is fully transparent and has no effect on the propagation of light. The light blocking area 222 is non-transparent and light cannot pass through. The light emitted from the first backlight module 21 has poor collimation. The light is adjusted by the louver microstructure layer of the privacy film, which can limit the light to a certain small angle and emit light with a narrow viewing angle. People in front of the display can clearly see the content of the liquid crystal display panel of the display, thereby achieving the purpose of left and right privacy protection of the display.

[0043] Please refer to Figure 2 , Figure 4 , Figure 7The second backlight module 23 also includes a second light guide plate 231 and a second optical film 232 which are stacked in sequence. The second light guide plate 231 is laid flat on the anti-peep optical component 22. The second light guide plate 231 has a special mesh structure, which can change the angle of light and make the light deviate to a specific viewing direction. The second optical film 232 is laid flat on the second light guide plate 231. In this embodiment, the second optical film 232 is a second diffuser. The light passing through the second light guide plate 231 enters the second diffuser, and the second diffuser atomizes the light to make it more uniform and avoid the generation of light spots. In other possible embodiments, the second optical film 232 may also be a reflective polarized brightening film, which is not set in the present application. The light passing through the second light guide plate 231 enters the reflective polarized brightening film, and the reflective polarized brightening film adjusts the light to make it brighter, thereby improving the brightness of the liquid crystal display panel and achieving a better visual effect. The first light source 233 included in the second backlight module 23 is located on the side of the second light guide plate 231, and the center line of the light source is on the same horizontal plane as the center line of the side of the first light guide plate 212. The light emitted by the second light source 233 enters the second light guide plate 231 from the side and is reflected by the special dot structure printed on the second light guide plate 231, so that the light entering the special dot structure can be reflected out of the second light guide plate 231 along a specific viewing angle direction, so that the display content of the liquid crystal display panel of the display can be clearly seen within a specific viewing angle range, and the anti-peeping effect is achieved in the remaining viewing angle range.

[0044] Please refer to Figure 6 , Figure 7 , Figure 8 The adjustable anti-peeping display further includes a driver (not shown in the figure), which is used to drive and control the on and off states of the first light source 215 and the second light source 233. It should be noted that the driver can be an existing one. Figure 6 Schematic diagram of light propagation. When the driver controls the first light source 215 to be in a constant on state and the second light source 233 to be off, the light passing through the first backlight module 21 is adjusted by the anti-peep optical group 22 to be a narrow-angle light and enters the second backlight module 23. The narrow-angle light is slightly disturbed by the second backlight module 23 and continues to be emitted from the second backlight module 23 as a narrow-angle light. People in front of the display can clearly see the contents of the display LCD panel, so the display is in a left and right anti-peep state. Figure 7 Schematic diagram of light propagation, when the driver controls the first light source 233 to be off, the second light source 215 to be always on, and the light passing through the second backlight module 23 is adjusted to be emitted in a specific viewing angle direction, so the display is visible in a specific viewing angle range, and the rest of the viewing angle range is in a peek-proof state. Figure 8Schematic diagram of light propagation, when the driver controls the first light source 215 and the second light source 233 to be in a constant on state, the light passing through the second backlight module 23 is in a superimposed state of the light of the first light source 215 and the light of the second light source 233, so the display is in a sharing mode, and is in an anti-peeping state for a specific viewing angle range; at the same time, the brightness of the LCD panel of the display is increased, and the overall visual viewing effect is improved. By driving and controlling the on and off states of the first light source 215 and the second light source 233, in conjunction with the optical effects of the first backlight module 21, the second backlight module 23 and the anti-peeping optical component 22, the anti-peeping function of the display and the automatic switching of the anti-peeping state are realized.

[0045] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the definition of "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable anti-peeping display, comprising a liquid crystal display panel, a backlight module assembly located below the liquid crystal display panel, and a back plate supporting the liquid crystal display panel and the backlight module assembly, characterized in that: The backlight module assembly includes a first backlight module, a second backlight module and an anti-peeping optical component, the first backlight module is located below the second backlight module, the anti-peeping optical component is arranged between the first backlight module and the second backlight module, the first backlight module and the second backlight module respectively include a first light source and a second light source, the first light source and the second light source are arranged on the side wall of the back panel, and the first light source and the second light source can be driven and controlled separately to make the liquid crystal display panel present an anti-peeping and normal display state.

2. The adjustable anti-peeping display according to claim 1, characterized in that: The privacy-prevention optical component is a privacy film, which is provided with a louver microstructure layer. The louver microstructure layer includes a plurality of light-blocking areas and light-transmitting areas arranged in parallel, and the light-transmitting area is located between the two light-blocking areas.

3. The adjustable anti-peeping display according to claim 2, characterized in that: The first backlight module also includes a reflective sheet, a first light guide plate, a first diffusion sheet, and a brightness enhancement sheet which are stacked in sequence. The reflective sheet is located above the bottom surface of the back plate, and the brightness enhancement sheet is located below the anti-peeping optical component.

4. The adjustable anti-peeping display according to claim 3, characterized in that: The brightness enhancement sheet comprises an upper brightness enhancement sheet and a lower brightness enhancement sheet, and the upper brightness enhancement sheet and the lower brightness enhancement sheet are orthogonally combined.

5. The adjustable anti-peeping display according to claim 3, characterized in that: The brightness enhancement sheet is a composite brightness enhancement sheet.

6. The adjustable anti-peeping display according to claim 3, characterized in that: The first light source is located on a side of the first light guide plate.

7. The adjustable anti-peeping display according to claim 1, characterized in that: The second backlight module further includes a second light guide plate and a second optical film which are stacked in sequence. The second light guide plate is located above the anti-peeping optical component, and the second optical film is located below the liquid crystal display panel.

8. The adjustable anti-peeping display according to claim 7, characterized in that: The second optical film comprises one or a combination of a second diffuser and a reflective polarizing brightness enhancement film.

9. The adjustable anti-peeping display according to claim 8, characterized in that: The second light source is located on the side of the second light guide plate.

10. The adjustable anti-peeping display according to any one of claims 1 to 9, characterized in that: It also includes a driver, which is used to drive and control the on and off states of the first light source and the second light source.

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