Ultra-narrow side highlight window machine back light brightness adjusting device

Abstract

The utility model relates to a kind of super-narrow edge highlight showcase machine back light brightness adjusting device, including outer frame (3), middle frame (4), liquid crystal screen (5), photosensitive component (1) and transparent light guide plate (2), the transparent light guide plate (2) is embedded in the inner side of outer frame (3), and it is 0.2-0.5mm to the outside, and the light end of this transparent light guide plate (2) extends to the photosensitive surface of photosensitive component (1);Photosensitive component (1) is embedded in the recess of outer frame (3), and the middle frame (4) is laminated between outer frame (3) and liquid crystal screen (5), to limit the axial displacement of transparent light guide plate (2);The output end of photosensitive component (1) is connected to backlight controller.The utility model has the advantages that: transparent light guide plate front end protruding frame, directly facing viewer, effectively capture screen directly in front of real-time illumination, picture is always comfortable and clear.

Description

Technical Field

[0001] This utility model relates to an ultra-narrow bezel high-brightness display window backlight brightness adjustment device, belonging to the field of optics. Background Technology

[0002] Existing display window (advertising) machines generally use fixed backlight brightness or only have a simple ambient light sensor on the top of the back shell / bezel, lacking a truly embedded "forward ambient light sensing module" in front of the screen. Therefore, regardless of whether the viewer is directly in front of the screen or at an angle, the real-time light intensity at their location cannot be accurately collected; the backlight brightness can only be adjusted according to the "average ambient illuminance," resulting in the image appearing too bright and glaring or too dark and indistinct in localized strong light or shadow scenes, affecting the information transmission effect.

[0003] Traditional photosensitive elements are typically exposed directly on the housing surface, with no structural constraints on the light path. In the installation environment of display screens, side decorative spotlights, ceiling downlights, and reflected stray light are common. These rays, not from the viewing direction, can easily enter the sensor directly, creating "side interference light." Because photosensitive devices cannot distinguish between useful and interference signals, the detected value can be artificially inflated or deflated, leading to incorrect backlight adjustment, wasted power consumption, and reduced display contrast.

[0004] Limited by the number and arrangement of sensors, existing light-sensing modules have detection blind spots in both the horizontal and vertical directions. When the viewer's position changes or the angle of the ambient light source changes, the deviation between the sensor sampling value and the actual illuminance in the field of view increases rapidly, resulting in insufficient matching between backlight brightness and ambient illuminance. Especially in ultra-narrow bezel high-brightness display screens, the space available for sensor placement is further limited due to the compressed bezel thickness, making the blind spot problem more prominent and ultimately affecting visual comfort and the overall energy efficiency of the machine. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this utility model provides an ultra-narrow bezel high-brightness window display backlight brightness adjustment device. The technical solution of this utility model is as follows:

[0006] A backlight brightness adjustment device includes an outer frame (3), a middle frame (4), a liquid crystal screen (5), a photosensitive component (1), and a transparent light guide plate (2). The transparent light guide plate (2) is embedded inside the outer frame (3) and protrudes outward by 0.2-0.5 mm. The light-emitting end of the transparent light guide plate (2) extends to the photosensitive surface of the photosensitive component (1). The photosensitive component (1) is embedded in a groove in the outer frame (3). The middle frame (4) is pressed between the outer frame (3) and the liquid crystal screen (5) to limit the axial displacement of the transparent light guide plate (2). The output end of the photosensitive component (1) is connected to a backlight controller.

[0007] The light-incident surface of the transparent light guide plate (2) is provided with a microstructure layer, which is composed of a V-shaped groove array with a groove depth of 0.1-0.3mm.

[0008] A bandpass filter is added to the optical path of the transparent light guide plate (2). The filter covers the visible light band with wavelengths of 400-700nm and shields infrared and ultraviolet light interference.

[0009] The photosensitive components (1) are in four groups and are arranged at the four corners of the transparent light guide plate (2) to form a four-quadrant light sensing array. The output signal of each group of photosensitive components (1) is input to the backlight controller.

[0010] It also includes a reference light source located inside the outer frame (3), which is a surface-mount LED whose light emission direction is aligned with the photosensitive surface of the photosensitive element (1).

[0011] The inner wall of the groove of the outer frame (3) is covered with a light-absorbing material layer, which is a black nano-coating.

[0012] An elastic sealing gasket is provided at the joint between the middle frame (4) and the outer frame (3), and the compression amount of the sealing gasket is 0.05-0.1mm; the elastic sealing gasket is a black silicone ring.

[0013] The transparent light guide plate (2) protrudes outward by 0.3 mm.

[0014] The advantages of this utility model are:

[0015] 1. The transparent light guide plate protrudes from the front edge of the frame, directly facing the viewer, effectively capturing real-time light from directly in front of the screen, ensuring a consistently comfortable and clear picture.

[0016] 2. The transparent light guide plate, combined with the light-absorbing material layer and elastic sealing gasket, forms multiple light path constraints, which greatly reduces lateral interference from decorative spotlights, ambient lighting, etc., resulting in more accurate test data and avoiding misadjustment of light.

[0017] 3. The four sets of photosensitive elements arranged at the four corners form a four-quadrant light-sensing array, which can capture environmental changes at any viewing angle in a timely manner, eliminate detection blind spots, and ensure that the backlight and ambient illuminance always maintain a high degree of matching.

[0018] 4. Built-in 400-700nm bandpass filter, which only allows visible light to enter the sensor, while invalid wavelengths such as infrared and ultraviolet are completely blocked, further improving the accuracy of brightness judgment and reducing false judgments.

[0019] 5. All optical and structural components are embedded inside the outer frame, without taking up additional display area, meeting the appearance requirements of ultra-narrow and ultra-thin display windows, balancing aesthetics and functionality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0021] Figure 2 yes Figure 1 AA sectional view.

[0022] Figure 3 yes Figure 2 Enlarged view of point C. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as a result of the description. However, these embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. Those skilled in the art should understand that modifications or substitutions can be made to the details and form of the technical solution of the present invention without departing from the spirit and scope of the present invention, but all such modifications and substitutions fall within the protection scope of the present invention.

[0024] See Figures 1 to 3 This utility model relates to a backlight brightness adjustment device, including an outer frame 3, a middle frame 4, a liquid crystal screen 5, a photosensitive component 1, and a transparent light guide plate 2. The transparent light guide plate 2 is embedded inside the outer frame 3 and protrudes outward by 0.2-0.5 mm. The light-emitting end of the transparent light guide plate 2 extends to the photosensitive surface of the photosensitive component 1. The photosensitive component 1 is embedded in a groove in the outer frame 3. The middle frame 4 is pressed between the outer frame 3 and the liquid crystal screen 5 to limit the axial displacement of the transparent light guide plate 2. The output end of the photosensitive component 1 is connected to a backlight controller. Preferably, the transparent light guide plate 2 protrudes outward by 0.3 mm.

[0025] The front end of the transparent light guide plate 2 protrudes by 0.2-0.5mm (preferably 0.3mm) and extends directly out of the frame. Compared with traditional side-mounted or rear-mounted sensors, it can truly capture the ambient illuminance from the viewer's perspective and avoid the problem of local over-brightness / under-darkness caused by average sampling.

[0026] Side spotlights and reflected stray light are reflected multiple times within the light guide plate and then absorbed by the black nano-coating in the grooves of the outer frame, retaining only the forward useful light.

[0027] The black silicone ring, when compressed, further blocks light leakage through the gap between the middle frame and the outer frame, preventing ambient light from entering the sensor.

[0028] Built-in 400-700nm bandpass filter blocks infrared (such as monitoring fill light) and ultraviolet bands commonly found in shop window environments, preventing sensors from misinterpreting "non-visible light" as ambient illuminance, improving the accuracy of backlight adjustment, and reducing ineffective power consumption.

[0029] All optical components (light guide plate, filter, sensor) are embedded in the inner groove of the outer frame, without taking up additional display area, meeting the design requirements of "ultra-narrow bezel + high screen ratio" for the display unit, while taking into account both functionality and minimalist appearance.

[0030] The light-incident surface of the transparent light guide plate 2 is provided with a microstructure layer, which is composed of an array of V-shaped grooves with a groove depth of 0.1-0.3mm.

[0031] A bandpass filter is added to the optical path of the transparent light guide plate 2. The filter covers the visible light band with wavelengths of 400-700nm and shields infrared and ultraviolet light interference.

[0032] The photosensitive components 1 are in four groups and are respectively arranged at the four corners of the transparent light guide plate 2, forming a four-quadrant photosensitive array. The output signal of each group of photosensitive components 1 is input to the backlight controller. The four groups of photosensitive components arranged at the four corners form a "four-quadrant array". No matter whether the viewer is directly in front of the screen or offset to the left or right, at least one sensor can directly receive the light from their viewing angle, eliminating the horizontal / vertical blind spots of traditional single-point sensors, and is especially suitable for the compact space of ultra-narrow bezels.

[0033] It also includes a reference light source disposed inside the outer frame 3. The reference light source is a surface-mount LED, and its light emission direction is aligned with the photosensitive surface of the photosensitive element 1.

[0034] The inner wall of the groove of the outer frame 3 is covered with a light-absorbing material layer, which is a black nano-coating.

[0035] An elastic sealing gasket is provided at the joint between the middle frame 4 and the outer frame 3. The compression amount of the sealing gasket is 0.05-0.1mm. The elastic sealing gasket is a black silicone ring.

[0036] The working principle of this utility model is as follows:

[0037] Step 1: Ambient light forward acquisition

[0038] The front end of the transparent light guide plate 2 protrudes from the outer frame 3 and is directly exposed in front of the screen, becoming a light sampling window.

[0039] The microstructure layer (V-shaped groove array, depth 0.1-0.3mm) efficiently couples forward ambient light into the light guide plate and suppresses large-angle stray light coupling, ensuring that only effective light from the viewer's perspective is collected.

[0040] Step 2: Optical path purification and filtering

[0041] The bandpass filter (400-700nm) is located in the light guide plate's optical path to shield infrared (such as monitoring supplementary lighting) and ultraviolet interference bands in the shop window environment, preventing sensors from misinterpreting non-visible light.

[0042] A black nano-coating covers the inner wall of the outer frame groove, absorbing stray lateral light (such as spotlights and reflected light) that has been reflected multiple times by the light guide plate, retaining only pure forward visible light.

[0043] Step 3: Four-quadrant light sensor array sampling

[0044] Four sets of photosensitive components 1 are embedded at the four corners of the light guide plate, forming a four-quadrant array. Regardless of whether the viewer is directly in front of the screen or offset to the left or right, at least one set of sensors directly receives the light from their viewing angle, eliminating the blind spots of traditional single-point sensors.

[0045] An elastic black silicone ring (compression 0.05-0.1mm) seals the joint gap between the middle frame 4 and the outer frame 3, blocking ambient light diffraction from entering the sensor and avoiding light leakage interference.

[0046] Step 4: Dynamic Calibration and Backlight Control

[0047] The reference light source (surface-mount LED) is located inside the outer frame and periodically emits visible light of known intensity to the photosensitive components. This is used to calibrate the sensitivity deviation of the sensor caused by temperature drift or aging, ensuring long-term detection accuracy.

[0048] The photosensitive components output signals to the backlight controller in real time. The controller dynamically adjusts the backlight brightness of the LCD screen based on the four-quadrant data to ensure that the display brightness is precisely matched with the ambient illuminance.

[0049] Step 5: Ultra-narrow bezel integration and stealth operation

[0050] All optical components (light guide plate, filter, sensor, LED) are fully embedded in the inner groove of the outer frame, without occupying the display area, thus meeting the requirements of ultra-narrow bezel design.

[0051] The device has no visible protrusions or openings when in operation, balancing functionality and minimalist appearance.

[0052] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A backlight brightness adjustment device, characterized in that, The device includes an outer frame (3), a middle frame (4), a liquid crystal screen (5), a photosensitive component (1), and a transparent light guide plate (2). The transparent light guide plate (2) is embedded inside the outer frame (3) and protrudes outward by 0.2-0.5 mm. The light-emitting end of the transparent light guide plate (2) extends to the photosensitive surface of the photosensitive component (1). The photosensitive component (1) is embedded in the groove of the outer frame (3). The middle frame (4) is pressed between the outer frame (3) and the liquid crystal screen (5) to limit the axial displacement of the transparent light guide plate (2). The output end of the photosensitive component (1) is connected to the backlight controller.

2. The backlight brightness adjustment device according to claim 1, characterized in that, The light-incident surface of the transparent light guide plate (2) is provided with a microstructure layer, which is composed of a V-shaped groove array with a groove depth of 0.1-0.3mm.

3. The backlight brightness adjustment device according to claim 1 or 2, characterized in that, A bandpass filter is added to the optical path of the transparent light guide plate (2). The filter covers the visible light band with wavelengths of 400-700nm and shields infrared and ultraviolet light interference.

4. The backlight brightness adjustment device according to claim 3, characterized in that, The photosensitive components (1) are in four groups and are arranged at the four corners of the transparent light guide plate (2) to form a four-quadrant light sensing array. The output signal of each group of photosensitive components (1) is input to the backlight controller.

5. The backlight brightness adjustment device according to claim 4, characterized in that, It also includes a reference light source located inside the outer frame (3), which is a surface-mount LED whose light emission direction is aligned with the photosensitive surface of the photosensitive component (1).

6. The backlight brightness adjustment device according to claim 5, characterized in that, The inner wall of the groove of the outer frame (3) is covered with a light-absorbing material layer, which is a black nano-coating.

7. The backlight brightness adjustment device according to claim 6, characterized in that, An elastic sealing gasket is provided at the joint between the middle frame (4) and the outer frame (3), and the compression amount of the sealing gasket is 0.05-0.1mm; the elastic sealing gasket is a black silicone ring.

8. The backlight brightness adjustment device according to claim 7, characterized in that, The transparent light guide plate (2) protrudes outward by 0.3 mm.

Images