Dynamic dimming assembly with night vision compatible function

Abstract

The invention provides a dynamic dimming assembly with a night vision compatible function, which relates to the technical field of optical devices and comprises a backlight cavity for supporting and fixing an internal structure; the white light LED assembly is arranged at the bottom of the backlight cavity and provides a daytime mode illumination light source; the electric rolling shafts are symmetrically arranged, the electric rolling shafts are arranged at the top of the white light LED assembly, a shielding film and a transparent film are connected to the electric rolling shafts, and the middle of the shielding film and the middle of the transparent film are spliced together; the night vision colored lamp strip is arranged at the top of the electric rolling shaft, is attached to the side wall of the backlight cavity and is used for providing a night mode illumination light source; in the daytime mode, the white light LED assembly is lightened, the transparent film is unfolded, the backlight function of dynamic dimming is achieved, in the night mode, the night vision colored lamp is lightened, the shielding film is unfolded, and the backlight function compatible with night vision is achieved.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of optical devices, and in particular to a dynamic dimming component with a night vision compatible function. Background Art

[0002] The backlight of traditional LCD screens is global dimming, that is, the backlight brightness is adjusted for the entire screen. Dynamic backlight means dividing the screen into multiple areas and independently controlling the backlight brightness of each area according to the display content. Dynamic backlight generally uses closely arranged LED bottom backlight as the light source, and adjusts the brightness of each area by the backlight drive circuit. Dynamic backlight can effectively improve the contrast of LCD display and reduce the backlight power consumption under dynamic pictures.

[0003] In the airborne display, the cockpit lighting and display system should be able to work with the night vision equipment, that is, the night vision compatibility requirement. According to the requirements of "GJB1394-1992 Aircraft Interior Lighting Compatible with Night Vision Imaging Systems", the light emitted by the lighting and display system that meets the Type I Class A night vision compatibility requirements should be cut off in the wavelength band greater than 625nm. The LCD display used in the airborne generally uses a side-incident backlight, and the white light LED and the night vision colored lights are arranged alternately on the backlight strip. The night vision colored lights are replaced by orange LEDs with a central wavelength of about 610nm to replace the red LED with a central wavelength of about 625nm, so that the luminous wavelength avoids the band above 625nm. In the day mode, the white light LED is lit to obtain a high-efficiency, high-brightness backlight, and in the night mode, the night vision colored lights are lit to obtain a backlight that meets the night vision compatibility requirements. The dynamic backlight needs to use the bottom backlight as the light source. In order to achieve the night vision compatibility function, the white light LED and the night vision colored lights are generally arranged alternately on the backlight board. In night mode, when the night vision colored lights are on, the emitted light is reflected by the diffusion film, prism brightening film, polarization brightening film, LCD screen and other components, and part of the light returns to the backlight cavity. The blue light incident on the surface of the white light LED will excite the phosphor and produce a small amount of red light. Since the night vision imaging system has the effect of amplifying weak light, the cutoff requirements for light with wavelengths greater than 625nm are very strict. The above technical solution will cause the LCD screen to fail to meet the night vision compatibility requirements.

[0004] It should be noted that the above contents belong to the technical cognition scope of the inventor. Since the technical contents in this field are vast and too complicated, the above contents of this application do not necessarily constitute prior art. Summary of the invention

[0005] 1. Technical problem to be solved by the invention: The present invention provides a dynamic dimming component with night vision compatibility function, which is used to solve the technical problems existing in the above-mentioned background technology.

[0006] 2. Technical solution: To achieve the above object, the present invention provides a technical solution: a dynamic dimming component with night vision compatibility function, comprising: The backlight cavity supports and fixes the internal structure; A white light LED component is arranged at the bottom of the backlight cavity to provide a day mode illumination backlight source; A symmetrically arranged electric roller, the electric roller is arranged on the top of the white light LED assembly, the electric roller is connected with a shielding film and a transparent film, and the shielding film and the transparent film are spliced ​​together in the middle; The night vision colored light bar provides a night mode lighting source, is arranged on the top of the electric roller, and is attached to the side wall of the backlight cavity.

[0007] The backlight cavity of the device is set in each area at the bottom of the screen for dimming operation. In the day mode, the bottom white light LED component performs lighting operation, and the night vision light strip is turned off. At this time, the shielding film is rolled up with the cooperation of two electric rollers, and the transparent film is unfolded and located on the top of the white light LED component. The bottom white light LED component can pass through the transparent film to play a lighting role; In night mode, the transparent film is rolled into the electric roller, and the shielding film is opened with the cooperation of the two electric rollers to completely shield the white light LED component at the bottom. The night vision colored light strips on the side wall are turned on to provide night vision lighting. Due to the shielding effect of the shielding film, the blue light in the night vision colored light strips is isolated from the white light LED component, avoiding the problem of blue light exciting the phosphor on the white light LED component to produce red light, thereby achieving better night vision compatibility.

[0008] A side wall support block is provided at the bottom of the night vision colored light strip, and a light guide plate is connected to the top of the side wall support block. The light guide plate and the night vision colored light strip are on the same horizontal plane.

[0009] A diffusion plate is arranged on the top of the light guide plate.

[0010] The shielding film is a diffuse reflection film, the transparent film is a prism brightness enhancement film, and the two ends of the middle part of the diffuse reflection film and the prism brightness enhancement film are respectively wound around the electric roller.

[0011] The light guide plate is made of PMMA material and has a thickness of 1mm-3mm.

[0012] The night vision colored light strip is welded with orange, green and blue colored lights that meet the night vision compatibility requirements, wherein the central wavelength of the orange light is less than or equal to 612nm.

[0013] The backlight cavity adopts a metal or plastic mechanical structure, and the surface is blackened and painted.

[0014] 3. Beneficial effects: Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The invention has a reasonable design and good night vision compatibility optimization. In the night vision mode, the diffuse reflection film completely shields the bottom white light LED component to prevent the light of the night vision colored lamp (especially the blue light) from exciting the phosphor of the white light LED to produce red stray light of >625nm, ensuring compliance with the GJB1394-1992 Type I Class A night vision compatibility standard; and the night vision colored lamp adopts ≤612nm orange light LED, actively avoids the band above 625nm, and eliminates incompatible wavelengths from the light source end; In addition, the present application has dynamic dimming capability. In daytime mode, the transparent film (prismatic brightness enhancement film) unfolds, allowing the bottom white light LED component to emit light normally, supporting zoned dynamic dimming, improving contrast and reducing power consumption; In night mode, the side-entry night vision colored light bar + light guide plate provides uniform backlight, while the shielding film ensures that the white light LED and the night vision colored light are completely isolated, and dynamic backlight partition control can still be achieved based on the night vision colored light.

[0015] It should be noted that the structures not introduced in the present invention are the same as the prior art or can be implemented by using the prior art, and are not described in detail here because they do not involve the design points and improvement directions of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 2 A schematic diagram of the present invention switching to day mode; Figure 3 A schematic diagram of switching to night mode of the present invention; Figure 4 It is a schematic diagram of the shielding film and the transparent film of the present invention when they are spliced ​​and unfolded.

[0017] Reference numerals: 1. Backlight cavity; 2. White light LED component; 3. Electric roller; 4. Shielding film; 5. Transparent film; 6. Night vision colored light strip; 7. Side wall support block; 71. Light guide plate; 8. Diffuser plate. DETAILED DESCRIPTION

[0018] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0020] In addition, the terms "first" and "second" 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 features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "provided with", "provided on" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] It should be noted that the structures not introduced in the present invention do not involve the design points and improvement directions of the present invention, and can adopt the existing technologies known to those skilled in the art.

[0023] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0024] See attached Figure 1-4 , a dynamic dimming component with night vision compatibility function, comprising The backlight cavity 1 supports and fixes the internal structure; A white light LED assembly 2, arranged at the bottom of the backlight cavity 1, to provide day mode illumination backlight; A symmetrically arranged electric roller 3, the electric roller 3 is arranged on the top of the white light LED assembly 2, the electric roller 3 is connected with a shielding film 4 and a transparent film 5, and the shielding film 4 and the transparent film 5 are spliced ​​together in the middle; The night vision colored light strip 6 provides night vision illumination backlight, is arranged on the top of the electric roller 3, and is attached to the side wall of the backlight cavity 1.

[0025] The backlight cavity 1 of the device is arranged in various areas at the bottom of the screen for dimming operation, wherein the white light LED assembly 2 has a dynamic dimming function. In the day mode, the bottom white light LED assembly 2 performs lighting operation, and the night vision colored light strip 6 is turned off. At this time, the shielding film 4 is rolled up under the cooperation of the two electric rollers 3, and the transparent film 5 is unfolded and located on the top of the white light LED assembly 2. The bottom white light LED assembly 2 can pass through the transparent film 5 to play a lighting role; In the night mode, the transparent film 5 is rolled into the electric roller 3, and the shielding film 4 is opened with the cooperation of the two electric rollers 3 to completely shield the white light LED component 2 at the bottom. The night vision colored light strip 6 on the side wall is turned on to provide night vision lighting. Due to the shielding effect of the shielding film 4, the blue light in the night vision colored light strip 6 is isolated from the white light LED component 2, avoiding the problem of blue light exciting the fluorescent powder on the white light LED component 2 to produce red light, thereby achieving better night vision compatibility function.

[0026] A side wall support block 7 is provided at the bottom of the night vision colored light strip 6, and the top of the side wall support block 7 is connected to a light guide plate 71. The light guide plate 71 and the night vision colored light strip 6 are on the same horizontal plane. The night vision colored lights are closely arranged on the light strip and diffused into a uniform surface light source through the light guide plate 71. The night vision colored light strip 6 is placed between the white light LED light panel and the LCD screen in the form of a side backlight to improve the night vision lighting effect.

[0027] A diffusion plate 8 is disposed on the top of the light guide plate 71 . The diffusion plate 8 is disposed at the top of the backlight cavity 1 and has the function of improving the uniformity of the backlight.

[0028] The shielding film 4 is a diffuse reflection film, and the transparent film 5 is a prism brightness enhancement film. The diffuse reflection film and the two ends of the middle splicing of the prism brightness enhancement film are respectively wrapped with the electric rollers 3. Under the action of the two symmetrically arranged electric rollers 3, the diffuse reflection film and the prism can cover and transmit light to the white light LED component 2 at the bottom. In the day mode, the electric roller 3 at the diffuse reflection film end is rolled inward, and the electric roller 3 at the prism brightness enhancement film end is unfolded outward until the prism brightness enhancement film has a light transmission effect on the white light LED component 2 at the bottom. The surface of the prism brightness enhancement film has a micro-prism structure, which can It can redirect the scattered light emitted by the white light LED component 2 and concentrate it within the viewing angle range directly in front of the screen to avoid light being absorbed or wasted, thereby improving the front brightness. In night mode, the electric roller 3 at the diffuse reflection film end expands outward, and the electric roller 3 at the prism brightening film end rolls inward until the diffuse reflection film shields the white light LED component 2 at the bottom. Since the diffuse reflection film has the characteristics of high reflection and zero transmittance, the blue light in the night vision colored lights is isolated from the white light LED on the dynamic backlight panel, avoiding the problem of blue light exciting the phosphor to produce red light, thereby achieving night vision compatibility.

[0029] The light guide plate 71 is made of PMMA material with a thickness of 1mm-3mm. In this embodiment, the light guide plate 71 is made of transparent material and has light guide dots on the bottom. The effect on the incident light from the bottom is equivalent to a low-fog diffusion film. The night vision colored light strip 6 is diffused into a uniform surface light source through the light guide plate 71. The light guide plate 71 is made of PMMA material with a light transmittance of up to 92%, which is better than 80%~90% of ordinary glass and close to the clarity of optical glass. The density is 1.18 g / cm³, which is only half of that of glass, but it has stronger impact resistance to improve the light guiding efficiency. It should be noted that the light guide plate 71 can also be made of other light guide materials, such as glass plates.

[0030] The night vision colored light strip 6 is welded with orange, green and blue colored lights that meet the night vision compatibility requirements, wherein the central wavelength of the orange light is less than or equal to 612nm. In applications requiring night vision compatibility, such as military, aviation or low-light environment equipment, the colored lights such as orange, green and blue on the light strip need to meet strict spectral radiation and brightness parameters to ensure compatibility with night vision devices such as third-generation / fourth-generation image intensifiers. The spectral radiation and brightness parameters of the orange, green and blue colored lights in this application need to meet the night vision compatibility requirements.

[0031] The backlight cavity 1 adopts a metal or plastic mechanical structure, and the surface is blackened and painted. The metal cavity has the advantages of impact resistance and deformation resistance, and is suitable for large size or high load applications. The metal has high thermal conductivity, which can help the LED backlight source dissipate heat and extend its life. The plastic cavity has low density and low overall structure weight. The blackened and painted surface can absorb scattered light, avoid backlight leakage or halo effect, and improve contrast.

[0032] The above-described embodiments only express a certain implementation mode of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A dynamic dimming component with night vision compatibility function, characterized in that: include The backlight cavity (1) supports and fixes the internal structure; A white light LED component (2) is arranged at the bottom of the backlight cavity (1) to provide day mode illumination backlight; A symmetrically arranged electric roller (3), the electric roller (3) being arranged on the top of the white light LED assembly (2), the electric roller (3) being connected to a shielding film (4) and a transparent film (5), the shielding film (4) and the transparent film (5) being spliced ​​together in the middle; A night vision colored light strip (6) provides night mode lighting backlight, is arranged on the top of the electric roller (3), and is attached to the side wall of the backlight cavity (1).

2. The dynamic dimming component with night vision compatibility function according to claim 1, characterized in that: A side wall support block (7) is provided at the bottom of the night vision colored light strip (6); the top of the side wall support block (7) is connected to a light guide plate (71); and the light guide plate (71) and the night vision colored light strip (6) are on the same horizontal plane.

3. The dynamic dimming component with night vision compatibility function according to claim 2, characterized in that: A diffusion plate (8) is provided on the top of the light guide plate (71).

4. The dynamic dimming component with night vision compatibility function according to claim 1, characterized in that: The shielding film (4) is a diffuse reflection film, the transparent film (5) is a prism brightness enhancement film, and the diffuse reflection film and the prism brightness enhancement film are spliced ​​in the middle and the two ends are respectively wound around the electric roller (3).

5. The dynamic dimming component with night vision compatibility function according to claim 3, characterized in that: The light guide plate (71) is made of PMMA material and has a thickness of 1 mm to 3 mm.

6. The dynamic dimming component with night vision compatibility function according to claim 1, characterized in that: The night vision colored light strip (6) is welded with orange, green and blue colored lights that meet the night vision compatibility requirements, wherein the central wavelength of the orange light is less than or equal to 612 nm.

7. The dynamic dimming component with night vision compatibility function according to claim 1, characterized in that: The backlight cavity (1) adopts a metal or plastic mechanical structure, and the surface is blackened and spray-painted.

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