Dimming Panel Local Backlight Control for Thin Display Devices
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Solution Overview
Problem
Conventional display devices that control backlight luminance for improved image quality often increase in thickness due to the need for light-emitting diodes under the display panel, compromising both image quality and device thickness.
Innovation Solution
A display device structure incorporating a dimming panel and a light guide with light-emitting diodes on the rear surface, allowing for controlled luminance adjustment without the need for light-emitting diodes under the display panel, thereby maintaining thinness while enhancing image quality through two-dimensional local dimming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light-emitting diodes are stacked on the display panel to control backlight luminance for each area, then image quality and contrast are improved, but the thickness of the display device increases
Solution Approach 1:
A dimming panel is introduced as an intermediary component between the backlight unit and the display panel. This dimming panel selectively blocks or transmits light in different regions, enabling local luminance control without requiring light-emitting diodes to be stacked on the display panel, thus maintaining thinness while achieving the desired backlight control effect
Solution Approach 2:
The backlight control is segmented into multiple independent regions through the dimming panel, which can control luminance for each predetermined area separately. This allows different luminance levels in different regions (e.g., brighter center, darker edges) without increasing overall device thickness, resolving the contradiction between localized illumination control and compact form factor
2Illumination intensity
If light-emitting diodes are provided on the rear surface to enable two-dimensional local dimming, then image contrast is enhanced, but device complexity increases
Solution Approach 1:
The dimming panel serves multiple functions: it acts as a light control element for local dimming, functions as a structural support component, and can be integrated with the backlight unit and display panel assembly. This multi-functionality reduces the need for separate components, thereby managing device complexity while achieving two-dimensional local dimming capability
Solution Approach 2:
The dimming panel is merged with the backlight unit and display panel assembly into an integrated structure. By combining these components into a unified system rather than separate assemblies, the overall device complexity is managed while still achieving the desired two-dimensional local dimming function across the display area
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
The solution enables improved image contrast and reduced power consumption by dynamically adjusting luminance for each section of the display, preventing thickness increase and allowing for finer contrast adjustments.
Implementation Method 1
a light guide which comprises an entrance surface facing the light source, and an exit surface from which light incident on the entrance surface exits
Data Source
AI summary
A display device is disclosed. In one embodiment, it includes a light source, a light guide including an entrance surface facing the light source and an exit surface from which light incident on the entrance surface exits, and a display panel including a display area in which a plurality of display pixels are arranged, with the display area facing the exit surface. The display panel is configured to selectively transmit light incident on the display area for displaying an image in the display area by driving the display pixels. A dimming panel including a dimming area faces the display area and the exit surface, and is configured to change a transmittance of light incident on the dimming area for each portion in the dimming area.