Display Device Local Dimming via Segmented Reflective Light Control
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Solution Overview
Problem
Conventional liquid crystal display devices struggle with insufficient brightness control across different display surfaces due to inadequate light guiding and reflection, making local dimming control challenging.
Innovation Solution
A display device with light emitting parts positioned near the reflective part, allowing for independent adjustment of light emission to different reflective regions, along with a control mechanism to adjust light intensity, enabling precise brightness control across each display surface without the need for a light guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide plate and reflective film are used to guide light to the entire display surface, then light can be distributed across the display area, but the brightness cannot be sufficiently controlled for each display surface because the light guiding position cannot be sufficiently controlled
Solution Approach 1:
The patent divides the display surface into multiple display areas and positions multiple light emitting parts at different locations along the reflective part. Each light emitting part corresponds to specific display area(s), enabling independent brightness control for each display area. This segmentation approach replaces the conventional single light guide plate system with multiple controllable light sources, directly resolving the contradiction between brightness control capability and device complexity.
Solution Approach 2:
The patent implements local quality by allowing different light emitting parts to emit different amounts of light based on the required brightness for different display areas. The control part adjusts the light emission of each light emitting part independently, enabling localized brightness control. This approach maintains the simplicity of the overall structure while achieving precise local brightness adjustment, resolving the contradiction between illumination control and device complexity.
2Ease of operation
If multiple light emitting parts are disposed near the end part of the reflective part to irradiate light to different reflective regions, then local dimming control becomes possible, but the device structure becomes more complex
Solution Approach 1:
The patent combines the light emitting parts with the reflective part structure, positioning them in close proximity and integrating their functions. The light emitting parts are disposed near the end part of the reflective part, merging the light emission and reflection functions into a compact arrangement. This integration reduces the overall device complexity while maintaining the local dimming control capability, resolving the contradiction between ease of operation and device complexity.
3Illumination intensity
If a light guide plate is used to guide light, then light distribution across the display surface is achieved, but the device configuration becomes more complex and energy loss increases
Solution Approach 1:
The patent extracts and removes the light guide plate from the device structure, replacing it with a direct configuration where light emitting parts are positioned near the reflective part. This elimination of the light guide plate reduces energy loss that occurs in conventional light guiding systems while maintaining effective light distribution across the display surface. The extraction principle directly addresses both the energy loss and device complexity issues.
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 allows for effective local dimming control, reducing energy loss and simplifying the device structure by eliminating the light guide plate, while ensuring uniform light distribution and enhanced contrast on the display surface.
Implementation Method 1
a reflective part disposed opposite the display part for reflecting irradiated light to the display part side
Data Source
AI summary
A display device includes a display screen, a reflective sheet disposed opposite the display screen and that reflects irradiated light toward the display screen, a plurality of light emitters disposed at one side of the reflective sheet and that irradiates light to different reflective regions of the reflective sheet, and a controller that adjusts an amount of light generated in each of the plurality of light emitters.