Ultrathin Display Device with Segmented Side-Lighting Backlight
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Solution Overview
Problem
Conventional display devices face challenges in achieving high dynamic contrast ratios due to the thickness limitations of edge-lighting type backlight sources, which restrict the number of partitioning blocks and thus hinder the attainment of ultrathin and high dynamic contrast displays.
Innovation Solution
The implementation of a side-lighting backlight source with a light guide plate and light emitting devices that emit light to the guide plate, combined with a light controlling component that adjusts light transmittance based on image contrast, allowing for a higher dynamic contrast without increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of partitioning blocks of the backlight source is increased to achieve higher HDR contrast value, then the dynamic contrast is improved, but the device thickness increases
Solution Approach 1:
The backlight source is divided into multiple independently controllable partitioning blocks along the light guide plate, allowing each block to be dimmed or turned off individually to achieve high dynamic contrast without requiring increased device thickness
Solution Approach 2:
The patent transitions from vertical stacking of multiple backlight units (which increases thickness) to horizontal segmentation of a single backlight source into multiple partitioning blocks along the light guide plate, achieving high contrast in the planar dimension without sacrificing thinness
2Illumination intensity
If a direct-lit backlight source is used to achieve high dynamic contrast, then the contrast ratio is improved, but the device thickness increases
Solution Approach 1:
The patent inverts the conventional direct-lit backlight architecture by using edge-lit configuration with a light guide plate, where light enters from the edge and is distributed across the display area, achieving thin profile while maintaining the ability to create multiple controllable zones for high contrast
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables the creation of an ultrathin display device with enhanced dynamic contrast, achieving a high contrast ratio of 20000:1 by controlling light brightness and transmittance, thereby improving display effectiveness.
Implementation Method 1
the side-lighting backlight source comprises a light guide plate and a plurality of light emitting devices at a side of the light guide plate, the plurality of light emitting devices being configured to emit light to the light guide plate from the side of the light guide plate
Implementation Method 2
the light controlling component is configured to control a light transmittance of each of the second regions according to the contrast of the image to be displayed by the corresponding region of the display panel
Data Source
AI summary
A display device includes: a side-lighting backlight source, a display panel, and a light controlling component; the side-lighting backlight source comprises a light guide plate and a plurality of light emitting devices; the light guide plate includes a plurality of first regions and a brightness of a light emitting face of each of the first regions is controllable by at least one of the light emitting devices; the light controlling component includes a plurality of second regions configured such that one of the first regions covers at least one of the second regions; the brightness of the light emitting face of each of the first regions and a light transmittance of each of the second regions are controlled according to the contrast of the image to be displayed by a corresponding region of the liquid crystal display panel.