Direct-Type Backlight with Varying Element Density for LCD Contrast
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Solution Overview
Problem
Existing liquid crystal display (LCD) devices with direct-type backlights face challenges in enhancing contrast and reducing image sticking in dynamic images, particularly in head-mounted displays, where maintaining high brightness while minimizing costs is essential.
Innovation Solution
A direct-type backlight design with varying light-emitting element densities, where the central area has a higher density of elements to enhance contrast and image performance, and the peripheral area has a lower density to reduce costs by minimizing the number of elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If uniform density of light-emitting elements is used across the entire backlight area, then manufacturing is simplified, but contrast and image performance in the central area cannot be effectively enhanced
Solution Approach 1:
The patent applies local quality by implementing different light-emitting element densities in different regions of the backlight. The central area has a higher density of light-emitting elements to enhance contrast and image performance, while the peripheral area has a lower density to reduce costs and simplify manufacturing. This spatial variation in element density directly addresses the technical contradiction by optimizing local performance without requiring uniform high-density construction across the entire area.
2Manufacturing precision
If higher density of light-emitting elements is used in the central area, then contrast and image performance are enhanced, but the overall cost and complexity of the backlight module increase
Solution Approach 1:
The patent implements local quality by concentrating higher-density light-emitting elements only where needed (central area) while using lower-density elements in less critical regions (peripheral area). This approach enhances contrast and image performance in the central area without unnecessarily increasing the cost and complexity of the entire backlight module, thus resolving the contradiction between performance enhancement and manufacturing ease.
Solution Approach 2:
The patent segments the backlight into distinct central and peripheral areas with different light-emitting element densities. This segmentation allows the central area to receive higher element density for improved performance while the peripheral area uses lower density to control costs, effectively balancing performance requirements with manufacturing considerations.
3Stability of the object's composition
If more light-emitting elements are used in the peripheral area, then uniform illumination is improved, but the number of elements and manufacturing cost increase
Solution Approach 1:
The patent applies local quality by providing different densities of light-emitting elements in different regions. The central area has higher density for enhanced contrast and image performance, while the peripheral area has lower density to reduce the total number of elements and manufacturing cost. This spatial differentiation allows the system to achieve adequate illumination uniformity without unnecessarily increasing the quantity of light-emitting elements throughout the entire 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
This approach effectively improves contrast and image performance in the central area of the LCD panel while reducing costs by lowering the number of light-emitting elements in the peripheral area, addressing issues like image sticking in dynamic images.
Implementation Method 1
A plurality of central area light-emitting elements are disposed in the central area to provide light to a liquid crystal display (LCD) panel
Data Source
AI summary
A display device and a direct-type backlight thereof are provided. The direct-type backlight includes a central area and a peripheral area. The central area is configured with a plurality of central area light-emitting elements to provide light to a liquid crystal display (LCD) panel. The density of these central area light-emitting elements in the central area is a first density. The peripheral area is configured with a plurality of peripheral area light-emitting elements to provide light to the LCD panel. The density of the peripheral area light-emitting elements in the peripheral area is a second density. Wherein, the second density is less than the first density.