Optical film group

Abstract

The optical film set comprises first glass, a DBEF film, a BEF film, a diffusion plate and a night vision film layer which are sequentially arranged in a stacked mode, an LED backlight plate is arranged below the night vision film layer, and heating glass and liquid crystal glass are arranged above the first glass; the LED backlight plate, the heating glass and the liquid crystal glass are all connected with the control circuit. According to the optical film group, the backlight utilization rate is improved through the first glass, the DBEF film, the BEF film, the diffusion plate, the first night vision film, the second glass, the second night vision film and the optical module which are arranged in a stacked mode, when the diffusion plate is used on the night vision films, light entering an observation visual angle during oblique observation is not only light obliquely entering an optical filter, but also light entering an observation visual angle during oblique observation; the vertically incident light is also scattered into the inclined observation view angle by the scattering film and is mixed with the obliquely incident light, so that the phenomenon that the color is blue is reduced, the LED backlight plate is used for providing backlight for the optical module, and the heating glass is used for heating the liquid crystal glass at low temperature.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of display device optical technology, and more particularly, to an optical film group. BACKGROUND

[0002] Today, the application of active matrix liquid crystal screen occupies the leading position, it can be confidently said that the flat screen will actually dominate all the display field: whether in civil, or in special purpose of modern display device; whether applied to micro display, or applied to large size display and digital television. Today, different sizes of active matrix liquid crystal screen can meet the needs of civil, military and aerospace enterprises. The display screen is very strong, can withstand a variety of impact load, moisture proof, ultraviolet radiation; the display screen module of prior art will cause the color to be blue when observing the screen.

[0003] Referring to Figure 1 As shown in the figure, the display screen module of prior art KORRY company uses diffusion plate 11 on the side facing the backlight, the diffusion plate is BEF brightness enhancement film 12, BEF brightness enhancement film 12 is compounded on the white glass 13, the upper surface of BEF film 12 is night vision sheet 14, a diffusion plate 15 is compounded on the upper surface of night vision sheet 14. The side of the diffusion plate facing the backlight is scattering layer, the other side is prism microstructure 16, KORRY company optical film group night vision compatible filter is placed on the top of the whole film group, according to experience, the method of using night vision compatible filter on top can improve the display brightness, but it will bring the phenomenon of color blue when observing the screen at an angle. SUMMARY

[0004] The present disclosure is to provide an optical film group which can prevent the color from being blue when observing the screen at an angle.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present disclosure is as follows:

[0006] An optical film group, comprising a first glass, a DBEF film, a BEF film, a diffusion plate and a night vision film layer arranged in sequence, the night vision film layer is below an LED backlight plate, the first glass is above a heating glass and a liquid crystal glass; the LED backlight plate, the heating glass and the liquid crystal glass are connected with a control circuit.

[0007] Optionally, the side of the diffusion plate facing the backlight is scattering layer, the other side is prism microstructure, the thickness of the diffusion plate is 1.7mm, the top angle of the prism is close to right angle, and the interval of the prism is 0.5mm.

[0008] Optionally, a shielding glass is further arranged above the liquid crystal glass, the shielding glass adopts 250 mesh screen, and the shielding glass further has an anti-reflection film.

[0009] Optionally, the control circuit comprises a controller connected with the interface circuit through a communication conversion circuit, the interface circuit is connected with the controller through a power conversion module, the interface circuit is connected with the liquid crystal glass through a liquid crystal timing control circuit, the controller is further connected with the heating glass through a heating switch, the controller is connected with the LED backlight plate through a backlight driving circuit, and the interface circuit is further connected with a communication conversion chip, the power conversion module and the backlight driving circuit respectively.

[0010] Optionally, the interface circuit is further connected with the heating switch through a hardware protection circuit.

[0011] Optionally, the controller is a GD32F450 master control chip.

[0012] Optionally, the night vision film layer comprises a first night vision film, a second glass and a second night vision film which are stacked.

[0013] Optionally, the BEF film has two layers, comprising a first BEF film and a second BEF film.

[0014] Optionally, the second night vision film is on one side of the external backlight lamp.

[0015] Optionally, the side surface of the optical film group has a mirror surface reflection film.

[0016] The optical film group of the present disclosure comprises a first glass, a DBEF film, a BEF film, a diffusion plate, a first night vision film, a second glass and a second night vision film which are stacked in sequence, and the optical module improves the backlight utilization rate. When the diffusion plate is used on the night vision film, not only the oblique incident light into the filter, but also the vertically incident light is scattered into the oblique observation angle by the scattering film when observing obliquely, and the color is mixed with the oblique incident light to reduce the phenomenon of color deviation to blue. The LED backlight plate is used to provide backlight for the optical module, and the heating glass is used to heat the liquid crystal glass at low temperature. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is a structure schematic diagram of the optical film group of KORRY company.

[0019] Figure 2 It is a structure schematic diagram of the optical film group of the present disclosure.

[0020] Figure 3 The principle block diagram of the control circuit in the optical film set of the present disclosure. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, so that the advantages and features of the present disclosure can be more easily understood by those skilled in the art, and the protection scope of the present disclosure can be more clearly defined.

[0022] Referring to Figure 2 As shown in the drawings, an optical film set includes a first glass 1, a DBEF film 2, a BEF film 3, a diffusion plate 4 and a night vision film layer which are sequentially stacked. The night vision film layer is below an LED backlight 10, and the first glass 1 is above a heating glass 8 and a liquid crystal glass 9; the LED backlight 10, the heating glass 8 and the liquid crystal glass 9 are all connected with a control circuit.

[0023] In an embodiment, the night vision film layer includes a first night vision film 5, a second glass 6 and a second night vision film 7 which are sequentially stacked. The second night vision film 7 is on one side of the external backlight, and the film-coated side faces the direction of the backlight. The second night vision film is on one side of the external backlight, and the night vision film layer uses a diffusion plate, which can reduce the phenomenon of color deviation to blue. Through testing of the night vision film layer of the present disclosure, it is found that the requirement of NVIS Class B can be fully met in the case of being closest to the light source. The optical film set includes a first glass 1, a DBEF film 2, a BEF film 3, a diffusion plate 4, a first night vision film 5, a second glass 6 and a second night vision film 7 which are sequentially stacked, and the optical module improves the backlight utilization rate. When the diffusion plate 4 is used on the night vision film, not only the oblique incident light into the filter, but also the vertically incident light is scattered into the oblique observation angle by the scattering film when the oblique observation is observed, and the color deviation to blue is reduced after mixing with the oblique incident light. The LED backlight 10 is used to provide backlight for the optical module, and the heating glass 8 is used to heat the liquid crystal glass at low temperature.

[0024] In an embodiment, referring to Figure 3As shown, the control circuit includes a controller 21, which can adopt the GD32F450 master control chip of the domestic innovation company, support serial signal interface input, and support Parallel RGB signal output. The controller 21 is connected with an interface circuit 23 through a communication conversion circuit 22, the communication conversion circuit 22 can convert the RS232 signal on the interface circuit 23 into a TTL signal and transmit it to the controller 21, the interface circuit 23 is connected with the controller 21 through a power conversion module 24, the interface circuit 23 can provide 5V voltage to power the power conversion module 24, and after conversion, power the controller 21 and the liquid crystal timing control circuit 28, the interface circuit 23 is connected with the liquid crystal glass 8 through the liquid crystal timing control circuit 28, the display signal is transmitted to the liquid crystal timing control circuit 28 through the interface circuit 23, and the liquid crystal glass 8 is controlled to display, the liquid crystal glass can adopt the TM043NDSP01-00 liquid crystal screen of Tianma, and the resolution supports 480*272 at most; the controller 21 is also connected with the heating glass 8 through a heating switch 25, and the heating glass 8 is controlled to heat, wherein a temperature sensor can be embedded in the optical film group, the controller 21 detects the temperature signal of the temperature sensor to control the heating glass 8, the controller 21 is connected with the LED backlight plate 10 through a backlight driving circuit 26, the backlight driving circuit 26 can provide a constant current source to drive the LED backlight plate 10 to emit light, and the chip of the LT3496EFE of the Lingte company can be selected, the chip is a wide-temperature-level device, supports 9-36V wide voltage input, supports PWM positive dimming, and has good voltage limiting and overcurrent protection. The interface circuit 23 is also connected with the communication conversion chip 22, the power conversion module 24 and the backlight driving circuit 26 respectively. The interface circuit is also connected with the heating switch 25 through the hardware protection circuit 27. There are many existing technologies for specific circuit design, which will not be repeated here.

[0025] In another embodiment, referring to Figure 1 、 Figure 2 As shown, the DBEF film 2 is also called a reflective brightness enhancement film, on the one hand, it can let the Y direction polarization component transmit with high transmittance, on the other hand, it can emit the X direction polarization component back with high reflectivity and recycle, the brightness of the whole system can be enhanced by 20% to 30% after adding the DBEF. The DBEF film 2 and the BEF film 3 are used together to achieve the maximum brightness gain effect.

[0026] The BEF film has two layers, including a first BEF film and a second BEF film. Two pieces of orthogonal BEF films are added. The axial luminance is increased. The BEF film can converge the originally lambert distributed light to the middle, so that the axial luminance is increased. The average axial luminance obtained after simulating 100000 light rays by lighttools is 46423 nit, and it can be seen that the BEF has a luminance gain of nearly 114%.

[0027] The ideal polarizer is modeled, and the optical parameters are shown in Table 4. Therefore, if the light emitted by the LED is natural light, the light after the BEF and before the LCD should still be natural light, so the light intensity after the ideal polarizer should be attenuated to half of the original, and the result of lighttools simulation is 22408 nit, which is 48.3% of 46423 nit before the screen.

[0028] In theory and practice, if a DBEF is added between the BEF and the LCD, the screen luminance should be greater than 22408 nit without the DBEF, and the result obtained after simulating 1000000 light rays by lighttools is 25208 nit, so the DBEF can have a luminance gain of 12.5%.

[0029] The diffusion plate 4 is a substrate made of an organic material coated with a layer of diffusion particles. It can also be a diffusion plate, that is, a small scattering particle is mixed in the interior of the plate, and the light is refracted and reflected by the diffusion particles when it is transmitted in the diffusion plate. The diffusion plate diffuses the linear light source or the point light source into a uniform surface light source to make the light emitted by the backlight lamp uniform. The side of the optical film group has a mirror reflection film 29. The mirror can image the LED array, and the total effect is equivalent to an infinite LED array emitting light, and the detection surface only corresponds to a small part of the infinite light emitting surface, so the illumination on the detection surface is uniform according to symmetry. If a diffuse reflection film is added, a uniform brightness distribution can be obtained.

[0030] Although the embodiments of the present disclosure are described in conjunction with the drawings, various modifications or changes can be made by the patent owner within the scope of the appended claims, as long as they do not exceed the protection scope described in the claims of the present disclosure, and should be within the protection scope of the present disclosure.

Claims

1. An optical film assembly, characterized in that, It includes a first glass, a DBEF film, a BEF film, a diffuser plate, and a night vision film layer stacked in sequence. Below the night vision film layer is an LED backlight panel, and above the first glass are a heated glass and a liquid crystal glass. The LED backlight panel, the heated glass, and the liquid crystal glass are all connected to a control circuit.

2. The optical film assembly according to claim 1, characterized in that: The diffuser plate has a scattering layer on one side facing the backlight lamp and a prism microstructure on the other side. The thickness of the diffuser plate is 1.7 mm, the apex angle of the prism is close to a right angle, and the spacing between the prisms is 0.5 mm.

3. The optical film assembly according to claim 1, characterized in that: A shielding glass is also provided above the liquid crystal glass. The shielding glass uses a 250-mesh screen and also has an anti-reflective coating.

4. The optical film assembly according to claim 1, characterized in that: The control circuit includes a controller, which is connected to an interface circuit via a communication conversion circuit. The interface circuit is connected to the controller via a power conversion module. The interface circuit is connected to the liquid crystal glass via a liquid crystal timing control circuit. The controller is also connected to the heated glass via a heating switch. The controller is connected to the LED backlight panel via a backlight driving circuit. The interface circuit is also connected to the communication conversion chip, the power conversion module, and the backlight driving circuit, respectively.

5. The optical film assembly according to claim 4, characterized in that: The interface circuit is also connected to the heating switch via a hardware protection circuit.

6. The optical film assembly according to claim 4, characterized in that: The controller is a GD32F450 main control chip.

7. The optical film assembly according to claim 1, characterized in that: The night vision film layer includes a first night vision film, a second glass, and a second night vision film stacked together.

8. The optical film assembly according to claim 1, characterized in that: The BEF membrane has two layers, including a first BEF membrane and a second BEF membrane.

9. The optical film assembly according to claim 7, characterized in that: The second night vision film is located on one side of the external backlight.

10. The optical film assembly according to claim 1, characterized in that: The optical film assembly has a mirror-reflective film on its side.

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