Dual-Prism Dimming Assembly for LCD Brightness and Viewing Angle
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Solution Overview
Problem
Existing liquid crystal display devices face issues with low brightness gain and narrow viewing angles due to the inefficiencies in the backlight module's 'diffusion sheet-diffusion sheet-prism' (DDP) structure, which results in high costs and increased module thickness.
Innovation Solution
A dimming assembly comprising a first prism and a second prism with specific dimming portions and intersection lines is introduced, which narrows the light-emitting angle and improves brightness gain, while maintaining a thin module design and low costs by replacing the DDP structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the DDP structure (diffusion sheet-diffusion sheet-prism) is used, then the viewing angle is improved, but the brightness gain is reduced and the module thickness increases
Solution Approach 1:
The single prism structure is segmented into two separate prisms (first prism and second prism) with different functions. The first prism narrows the light-emitting angle to improve brightness gain, while the second prism controls the viewing angle. This segmentation allows independent optimization of each function without compromise.
Solution Approach 2:
Different regions of the optical path are assigned different functional qualities. The first prism located closer to the light source focuses on brightness enhancement through angle narrowing, while the second prism positioned afterward focuses on viewing angle control. Each component has specialized local functionality rather than attempting to perform all functions uniformly.
2Adaptability or versatility
If the DDP structure is used, then the viewing angle is improved, but the module thickness and cost increase
Solution Approach 1:
The invention extracts and eliminates the diffusion sheets from the traditional DDP structure, retaining only the essential prism components. By removing the thick diffusion sheet layers while keeping the two thinner prisms, the module achieves the desired viewing angle improvement with significantly reduced overall thickness.
Solution Approach 2:
The invention changes the structural parameters by transitioning from a multi-layer diffusion-based structure to a dual-prism structure with specific dimensional relationships. The first prism has a smaller pitch (distance between adjacent intersection lines) than the second prism, creating optimized light control with reduced thickness requirements.
3Illumination intensity
If the first prism narrows the light-emitting angle, then the brightness gain is improved, but the viewing angle is reduced
Solution Approach 1:
The viewing angle control function is segmented from the brightness enhancement function by placing a second prism after the first prism. The first prism narrows the light-emitting angle for brightness gain, while the second prism subsequently expands and controls the viewing angle, ensuring both functions are achieved independently.
4Illumination intensity
If two prisms are used instead of DDP structure, then the brightness gain is improved, but the manufacturing complexity increases
Solution Approach 1:
The invention merges the functions of multiple optical components (diffusion sheets and prism) into a simplified two-prism structure. By combining brightness enhancement and viewing angle control into two integrated prism components with standardized geometries, the overall manufacturing complexity is reduced compared to assembling multiple diffusion sheets and prisms separately.
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 dimming assembly enhances the brightness gain and widens the viewing angles of liquid crystal display devices, meeting both horizontal and vertical viewing angle requirements while maintaining a lightweight and cost-effective design.
Implementation Method 1
The first prism has a first surface and a second surface opposite to each other. The first surface includes a plurality of first dimming portions. Each first dimming portion includes two first side surfaces, and edges of the two first side surfaces away from the second surface intersect at a first intersection line. The second prism is disposed on a side where the second surface of the first prism is located...
Data Source
AI summary
A dimming assembly includes a first prism having a first surface and a second surface opposite to each other, and a second prism disposed on a side where the second surface of the first prism is located. The first surface includes first dimming portions, each of which includes two first side surfaces. Edges of the two first side surfaces away from the second surface intersect at a first intersection line. A surface of the second prism proximate to the second surface includes second dimming portions, each of which includes two second side surfaces. Edges of the two second side surfaces proximate to the second surface intersect at a second intersection line. A distance between orthographic projections of two adjacent first intersection lines on the second surface is less than a distance between orthographic projections of two adjacent second intersection lines on the second surface.