Charged Particle Light Guide for 2D Local Dimming
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Solution Overview
Problem
Conventional edge-type backlight units face challenges in achieving accurate 2D local dimming due to the difficulty in controlling light distribution across the light guide plate, leading to inefficient light usage and reduced contrast ratios in display devices.
Innovation Solution
Incorporating charged particles with distinct charge properties into the light guide plate, where the positions of these particles are controlled by a transparent electrode, allowing for independent operation in light-reflecting and light-shielding modes to manage light distribution accurately across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If an edge-type backlight unit is used to reduce device thickness, then the thin form factor is achieved, but accurate 2D local dimming control becomes difficult
Solution Approach 1:
The patent divides the backlight unit into multiple independently controllable light emission regions along the edge, allowing each region to have different brightness levels. This local quality control enables accurate 2D local dimming while maintaining the thin edge-type structure, as each region can be precisely adjusted without affecting the overall device thickness.
Solution Approach 2:
The backlight unit is segmented into multiple light emission regions that can be controlled independently. By segmenting the light source control along the edge, the system achieves fine-grained 2D local dimming capability while preserving the compact thin form factor of the edge-type backlight unit.
2Device complexity
If conventional light guide plates are used to simplify structure, then device complexity is reduced, but light distribution control efficiency deteriorates
Solution Approach 1:
The patent introduces controllable light emission regions that can dynamically adjust their brightness levels independently. This dynamic control capability is integrated into the light guide plate structure, allowing efficient light distribution control without significantly increasing structural complexity, as the control is achieved through electrical signals rather than mechanical adjustments.
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
Enables precise 2D local dimming and improved brightness uniformity, reducing power consumption and enhancing contrast ratios in display devices while maintaining a thin form factor.
Implementation Method 1
The first charged portion reflects the light received from the light source unit
Implementation Method 2
the second charged portion absorbs the light received from the light source unit
Implementation Method 3
Positions of the first and second charged portions of each of the plurality of charged particles are controlled based on a voltage applied to the transparent electrode
Data Source
AI summary
A display device includes a backlight unit and a display panel disposed on the backlight unit. The backlight unit includes a light guide plate including a plurality of charged particles, a light source unit disposed at a side of the light guide plate and providing light to the light guide plate, and a transparent electrode disposed under the light guide plate. Each of the plurality of charged particles includes first and second charged portions which have charge values of which polarities are different from each other. The first charged portion reflects the light received from the light source unit, and the second charged portion absorbs the light received from the light source unit. Positions of the first and second charged portions of each of the plurality of charged particles are controlled based on a voltage applied to the transparent electrode.