LCD with contrast improving structure

Abstract

The invention relates to the field of display devices, in particular to an LCD with a contrast improving structure. The LCD comprises a backlight layer, a backlight control layer and a light display layer, wherein the backlight layer, the backlight control layer and the light display layer are connected in sequence, the backlight layer is used for emitting a light source, the backlight control layer filters a light source emitted by the backlight layer, a light display surface is arranged on the light display layer, and the light display surface displays the visible light filtered by the backlight control layer. According to the invention, the backlight control layer is arranged between the backlight layer and the light display layer, and pixel-level filtering control is carried out on light transmission by arranging the backlight control layer, so that light of the black area part of the light display layer is blocked to extremely low brightness, and light reaching the light display layer cannot penetrate through a display surface so as to achieve the ultra-high contrast of the display surface of the light display layer.

Description

technical field [0001] The invention relates to the field of displays, in particular to an LCD display with a contrast-enhancing structure. Background technique [0002] With the evolution of technology, the display industry has begun to gradually transition from LCD (Liquid Crystal Display) to OLED (Organic Diode Display). Compared with the bright and high dynamics of OLED, LCD has an obvious disadvantage in dynamic range, that is, LCD contrast is insufficient. Compared with the contrast ratio of tens of millions of OLEDs, conventional LCDs only have a contrast ratio of 1000-3000. Such a contrast greatly limits the dynamic range of the LCD, so that the LCD is obviously less effective than the OLED display when performing HDR playback. [0003] In the traditional scheme, the traditional LCD display technology consists of white backlight plus TFT-cell, and polarizers are pasted on both sides of the cell. However, because the transmittance of the polarizer and the degree of p...

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Problems solved by technology

Such a contrast greatly limits the dynamic range of the LCD, making the effect of the LCD display worse than that of the OLED display when performing HDR playback.

[0003] In the traditional scheme, the traditional LCD display technology consists of white backlight plus TFT-cell, and polarizers are pasted on both sides of the cell. However, because the transmittance of the polarizer and the degree of polarization are mutually exclusive, the degree of polarization is generally between 90-99%, that is, the total A small amount of light will leak out, causing the dark part of the LCD to not be black enough so that the LCD contrast can only be maintained at the level of 800-2000

[0004] figure 1 For the traditional solution, 100 is CF (color filter), 200 is array (TFT array, active switch matrix; TFT-thin film field effect tube), 300 is backlight, 400 is BM (blackmatrix-black matrix), 500 is down Polarizer, 600 is the upper polarizer; in the traditional scheme, the color, light and dark changes are realized by switching the red, green and blue sub-pixels, but the degree of polarization of the polarizer cannot reach the theoretical 100% and the films in the LCD box The complex relationship of transmission, reflection, and refraction prevents the pixels from being completely closed, that is, the light from the backlight always leaks through the LCD to reach the human eye. Therefore, the contrast ratio of LCD cannot be tens of millions like OLED

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