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Light redirecting film, backlight, and display system

A technology of light redirection and backlight, which is applied in some aspects of light redirection film and books, and can solve problems such as limitations

Active Publication Date: 2020-12-18
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The contrast provided by the display is limited by the ability of the LCD display panel to block light from the backlight

Method used

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  • Light redirecting film, backlight, and display system
  • Light redirecting film, backlight, and display system
  • Light redirecting film, backlight, and display system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0045] Embodiment 1 is a backlight, which is used to provide uniform illumination to a display surface disposed on the backlight, and the backlight includes:

[0046] a plurality of discrete spaced light sources configured to illuminate non-overlapping illumination regions in the display surface in a one-to-one correspondence; and

[0047] A first microstructured film disposed on and facing the plurality of light sources such that when the display surface is disposed on the first microstructured film and the light sources are energized, At least 80% of the light emitted by each light source illuminates a corresponding illuminated area in the display surface, and the luminous intensity distribution across the plurality of illuminated areas has a mean value I and a standard deviation S, S / I<1.

Embodiment approach 2

[0048] Embodiment 2 is the backlight of embodiment 1, wherein the display surface is a pixelated surface comprising a plurality of pixels.

Embodiment approach 3

[0049] Embodiment 3 is the backlight of embodiment 2, wherein the pixels are individually addressable.

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PUM

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Abstract

A light redirecting film, a backlight including the light redirecting film, and a display system including the backlight are described. The light redirecting film may be a microstructured film including a plurality of substantially parallel spaced apart structures on a substrate. The backlight includes a plurality of discrete spaced apart light sources configured to illuminate a plurality of non-overlapping illumination zones in a display surface in a one-to-one correspondence relationship; and a microstructured film disposed on the plurality of light sources, such that when the display surface is disposed on the microstructured film and the light sources are energized, at least 80% of light emitted by each light source illuminates a corresponding illumination zone in the display surface,and a luminous intensity distribution across the plurality of the illumination zones has an average I and a standard deviation S, where S / I < 1.

Description

Background technique [0001] Liquid crystal displays (LCDs) typically use a backlight to provide light to the LCD display panel. The contrast provided by the display is limited by the ability of the LCD display panel to block light from the backlight. High dynamic range (HDR) LCD displays can utilize local dimming to increase the contrast of the display. Contents of the invention [0002] In some aspects of the present specification, a backlight for providing uniform illumination of a display surface disposed thereon is provided. The backlight includes: a plurality of discrete spaced light sources configured to illuminate a plurality of non-overlapping illumination regions in the display surface in a one-to-one correspondence; and a first microstructured film, the first microstructured film is disposed over and facing the plurality of light sources such that at least 80% of the The light illuminates corresponding illuminated areas in the display surface. The luminous inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V8/00
CPCG02F1/133606G02F1/133607G02B6/005G02F1/133603
Inventor 加里·T·博伊德
Owner 3M INNOVATIVE PROPERTIES CO
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