Liquid crystal color filter and liquid crystal screen assembly using same

Abstract

The invention relates to a liquid crystal color filter and a liquid crystal screen assembly using the same, the liquid crystal color filter comprises a liquid crystal color filter, the liquid crystal color filter comprises a filter body, and a first color resistor, a second color resistor, a third color resistor and a fourth color resistor which are sequentially arranged along the filter body are arranged in the filter body. The four color resistors O (orange), R (red), G (green) and B (blue) are distributed on the color filter, so that a night vision compatible function is realized; and the LEDs are densely distributed on the backlight lamp panel, so that a smaller partition size and more partitions are provided. The display device has a local dimming and night vision compatible function, can be applied to a special display scene which needs to be used with a night vision device at the same time, and realizes high contrast, low power consumption and night vision compatible performance.

Description

Technical Field

[0001] The invention relates to the field of design and development of liquid crystal displays, in particular to a liquid crystal color filter and a liquid crystal screen assembly using the filter. Background Art

[0002] Liquid crystal display devices have the characteristics of high technical maturity and high reliability, and are still widely used in special display industries such as automotive and medical. The LCD screen itself does not emit light and needs a backlight to provide illumination. The light passes through the red, green, and blue resistance on the color filter in each sub-pixel area to form the three primary colors of red, green, and blue, and the mixed colors form other colors. Therefore, the color resistance characteristics of the backlight and the LCD color filter will greatly affect the display effect of the display.

[0003] Local dimming, also known as dynamic backlighting, is a technology that enhances contrast by adjusting the backlight brightness of different areas of the screen. Local dimming technology divides the backlight of the LCD display into multiple small areas and controls the brightness of different areas according to the image content. For example, lowering the backlight brightness in a dark background can improve contrast and reduce power consumption. The effect depends on the partition size and the number of partitions. The smaller the partition and the more partitions there are, the better the dimming effect. At the same time, due to the existence of the LED light emission angle, reducing the distance from the LED to the display can effectively improve the halo problem.

[0004] In some special display fields, observers need to wear night vision goggles. At this time, the light emitted by the display device needs to be compatible with the night vision goggles and cannot interfere with the normal response of the night vision goggles. That is, the display device needs to meet the night vision compatibility requirements. Under the night vision compatibility requirements, LCDs generally use two backlight systems as backlight sources. One is a conventional LED that radiates a full-band spectrum from 380nm to 780nm as a backlight source to provide backlight for the LCD during normal display. The other is a color LED that filters the spectrum after 630nm as a backlight source to provide backlight that avoids the night vision goggles' response light band when the LCD is used under night vision compatibility.

[0005] When applying local dimming technology under night vision compatibility requirements, if two backlight systems are used to achieve night vision compatibility, colored LEDs need to be interspersed in the backlight board full of LEDs. In this way, the number of LEDs arranged on the backlight board with limited size is limited, making the partition size larger and the number smaller. At the same time, in order to avoid uneven intervals of light and dark, the distance between the LCD screen and the LED needs to be increased, which will further expand the halo and affect the effect of local dimming.

[0006] Therefore, if the use of a second set of color LED backlight sources can be avoided in display devices that use local dimming technology, the LED spacing can be effectively reduced, the partitions can be reduced, the number of partitions can be increased, the distance between the LCD screen and the LED can be reduced, and the halo can be reduced, which is beneficial to improving the display effect of local dimming. Summary of the invention

[0007] In order to solve the above technical problems, the present invention proposes a liquid crystal color filter and a liquid crystal screen assembly using the filter. The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0008] A liquid crystal color filter comprises a filter body, wherein a first color resistor, a second color resistor, a third color resistor and a fourth color resistor are arranged in sequence along the filter body;

[0009] The first color resist is one of red color resist, green color resist, blue color resist and orange color resist;

[0010] The second color resist is another color resist among the red color resist, the green color resist, the blue color resist and the orange color resist that is different from the first color resist;

[0011] The third color resist is another color resist among the red color resist, the green color resist, the blue color resist and the orange color resist that is different from the first color resist and the second color resist;

[0012] The fourth color resist is one of the red color resist, the green color resist, the blue color resist and the orange color resist, which is different from the first color resist, the second color resist and the third color resist.

[0013] The first color resist, the second color resist, the third color resist and the fourth color resist are of the same size and arranged at the same intervals.

[0014] The first color resist, the second color resist, the third color resist and the fourth color resist are made of spectrally absorbing materials or are optically coated on the surface.

[0015] A liquid crystal screen assembly adopts the liquid crystal color filter and also includes a brightness enhancement film, a quantum dot film, an LED and a substrate which are sequentially distributed below the liquid crystal color filter.

[0016] The brightness enhancement film has a thickness of 0.3 mm to 0.7 mm, and the brightness enhancement film includes a brightness enhancement film and a polarization brightness enhancement film.

[0017] The quantum dot film has a thickness of 0.5 mm to 1 mm.

[0018] The LED package is no larger than 1.0mm×1.0mm, the distance between LEDs is 0.5mm to 1mm, and the distance between the LED and the lower surface of the liquid crystal color filter is 1.3mm to 2.2mm.

[0019] The LED is white light or blue light.

[0020] The beneficial effects of the present invention are as follows: the present invention achieves night vision compatibility by distributing four color resistances of O (orange), R (red), G (green), and B (blue) on the color filter; the LEDs are densely distributed on the backlight panel, providing a smaller partition size and a larger number of partitions. The display device has local dimming and night vision compatibility functions, and can be applied to special display scenes that need to be used simultaneously with night vision devices to achieve high contrast, low power consumption, and night vision compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 is a schematic diagram of the structure of a liquid crystal color filter of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the liquid crystal screen assembly of the present invention.

[0024] As shown in the figure: 1. Filter body; 2. First color resistance; 3. Second color resistance; 4. Third color resistance; 5. Fourth color resistance; 6. Brightness enhancement film; 7. Quantum dot film; 8. LED; 9. Substrate. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be explained more clearly and completely below in conjunction with the drawings in the embodiments. Of course, the described embodiments are only a part of the present invention but not all of it. Based on this embodiment, other embodiments obtained by those skilled in the art without creative labor are all within the protection scope of the present invention.

[0026] like Figure 1 to Figure 2 As shown, a liquid crystal color filter comprises a filter body 1, wherein the filter body 1 is provided with a first color resist 2, a second color resist 3, a third color resist 4 and a fourth color resist 5 which are sequentially arranged along the filter body 1;

[0027] The first color resist 2 is one of red color resist, green color resist, blue color resist and orange color resist;

[0028] The second color resist 3 is another color resist among the red color resist, the green color resist, the blue color resist and the orange color resist, which is different from the first color resist 2;

[0029] The third color resist 4 is another color resist among the red color resist, the green color resist, the blue color resist and the orange color resist, which is different from the first color resist 2 and the second color resist 3;

[0030] The fourth color resist 5 is one of the red color resist, the green color resist, the blue color resist and the orange color resist, which is different from the first color resist 2 , the second color resist 3 and the third color resist 4 .

[0031] The first color resist 2 , the second color resist 3 , the third color resist 4 and the fourth color resist 5 are of the same size and arranged at the same intervals.

[0032] The first color resist 2 , the second color resist 3 , the third color resist 4 and the fourth color resist 5 are made of spectrally absorbing materials or are optically coated on the surface.

[0033] like Figure 1 As shown, the color resistance distribution in a complete pixel area of ​​the liquid crystal color filter, including the first color resistance 2, the second color resistance 3, the third color resistance 4 and the fourth color resistance 5, which are four kinds of color resistances: O (orange), R (red), G (green) and B (blue). Among them, the average transmittance of the O color resistance is not less than 85% in the range of 380nm to 630nm, and the cut-off depth is not greater than OD3 in the range of 630nm to 930nm (that is, the average transmittance is not greater than 0.1%). R, G, and B are conventional red, green, and blue resistances. When the LCD screen works in normal mode, the sub-pixels corresponding to R, G, and B work to display the picture; when working in night vision compatible mode, the sub-pixels corresponding to O, G, and B work to reduce the radiation in the band after 630nm, so that the radiant brightness meets the night vision compatible requirements, and the spectrum of the band after 630nm is filtered by the application of orange resistance.

[0034] A liquid crystal screen assembly adopts the liquid crystal color filter, and also includes a brightness enhancement film 6, a quantum dot film 7, an LED 8 and a substrate 9 which are sequentially distributed below the liquid crystal color filter.

[0035] The brightness enhancement film 6 has a thickness of 0.3 mm to 0.7 mm. The brightness enhancement film 6 includes a brightness enhancement film and a polarization brightness enhancement film, and mainly plays a role of brightness enhancement.

[0036] The thickness of the quantum dot film 7 is 0.5 mm to 1 mm. The quantum dot film 7 can also be set as a diffusion film, in which the red light quantum dots in the quantum dot film 7 are excited by blue light to produce red light, and the green light quantum dots are excited by blue light to produce green light, which are mixed with the blue light to form white light.

[0037] The LED8 package is no larger than 1.0mm×1.0mm, the distance between LEDs is 0.5mm to 1mm, and the distance between LEDs and the lower surface of the liquid crystal color filter is 1.3mm to 2.2mm. Each LED can be individually controlled by an external drive circuit, and the brightness can be controlled according to the grayscale signal of the LCD screen to achieve local dimming function.

[0038] The LED 8 emits white light or blue light.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A liquid crystal color filter, characterized in that: The optical filter body (1) comprises a first color block (2), a second color block (3), a third color block (4) and a fourth color block (5) which are arranged in sequence along the optical filter body (1); The first color resist (2) is one of a red color resist, a green color resist, a blue color resist and an orange color resist; The second color resist (3) is another color resist among the red color resist, the green color resist, the blue color resist and the orange color resist, which is different from the first color resist (2); The third color resist (4) is another color resist among the red color resist, the green color resist, the blue color resist and the orange color resist, which is different from the first color resist (2) and the second color resist (3); The fourth color resist (5) is one of the red color resist, the green color resist, the blue color resist and the orange color resist, which is different from the first color resist (2), the second color resist (3) and the third color resist (4).

2. The liquid crystal color filter according to claim 1, characterized in that: The first color block (2), the second color block (3), the third color block (4) and the fourth color block (5) are of the same size and arranged at the same intervals.

3. The liquid crystal color filter according to claim 1, characterized in that: The first color resist (2), the second color resist (3), the third color resist (4) and the fourth color resist (5) are made of spectrally absorbing materials or are optically coated on the surface.

4. A liquid crystal screen assembly, characterized in that: The liquid crystal color filter according to any one of claims 1 to 3 further comprises a brightness enhancement film (6), a quantum dot film (7), an LED (8) and a substrate (9) which are sequentially distributed below the liquid crystal color filter.

5. A liquid crystal screen assembly according to claim 4, characterized in that: The brightness enhancement film (6) has a thickness of 0.3 mm to 0.7 mm, and comprises a brightness enhancement film and a polarization brightness enhancement film.

6. A liquid crystal screen assembly according to claim 4, characterized in that: The quantum dot film (7) has a thickness of 0.5 mm to 1 mm.

7. The liquid crystal screen assembly according to claim 4, characterized in that: The LED (8) package is no larger than 1.0 mm×1.0 mm, the distance between LEDs is 0.5 mm to 1 mm, and the distance between the LED and the lower surface of the liquid crystal color filter is 1.3 mm to 2.2 mm.

8. The liquid crystal screen assembly according to claim 4, characterized in that: The LED (8) emits white light or blue light.

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