Optical film, backlight module and display device

Abstract

The invention provides an optical film, a backlight module and a display device, and belongs to the technical field of display. The optical film comprises a plurality of optical units. Each optical unit comprises a first transparent electrode, a second transparent electrode, a capsule which is located in an electric field range between the first transparent electrode and the second transparent electrode, and a plurality of polar particles located in the capsule, wherein under the action of an electric field between the first transparent electrode and the second transparent electrode, the plurality of the polar particles can be switched between a first state and a second state; in the first state, the plurality of the polar particles are randomly distributed in the capsule; and in the second state, the plurality of the polar particles are gathered on the surface of the capsule. According to the technical scheme, the lateral backlight module can be enabled to achieve a local dimming effect.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an optical film, a backlight module and a display device. Background technique [0002] In traditional display technology, the backlight module is located on the back of the liquid crystal display panel, and the different partial brightness of the screen is generally controlled by applying different gray-scale voltages (L0 to L255, a total of 256 levels) to the pixels to control the degree of liquid crystal deflection (different degrees of deflection Different screen transmittances Tr%) will be brought, and then different brightness or colors will be displayed in different areas of the screen. However, due to the low grayscale light leakage problem of the LCD panel (L0 brightness>0), it is impossible to achieve high contrast ratio (contrast ratio = L255 screen brightness ÷ L0 screen brightness) under the condition of ensuring the brightness of the white screen (L255). [000...

AI Technical Summary

Problems solved by technology

However, due to the low grayscale light leakage problem of the LCD panel (L0 brightness > 0), it is impossible to achieve high contrast under the condition of ensuring the brightness of the white screen (L255) (contrast ratio = L255 screen brightness ÷ L0 screen brightness)

[0003] The existing side-lit backlight module can realize global dimming, but this technology can only improve the contrast of different pictures, and cannot achieve the contrast improvement in the same picture; the direct-lit backlight module can realize local dimming, which can realize High contrast on the same screen

[0004] As the contrast ratio of the display screen is getting higher and higher, mini LED and Micro LED technologies for making direct-lit backlight modules have received unprecedented attention. There is still a long way to go before mini LED and Micro LED technologies can be commercialized in large quantities, and the prices are still high

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