Thin Film Diffusion Member for LCD Brightness Uniformity
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Solution Overview
Problem
Large-size liquid crystal display devices face issues with the mura phenomenon, which causes brightness non-uniformity and display quality deterioration due to the strong straightness of light emitted from light sources, and existing solutions like thick diffusion plates increase the overall thickness of the device.
Innovation Solution
A liquid crystal display device with a thin diffusion member made of fiber material and supported by wires, reducing the thickness and sagging issues while minimizing the mura phenomenon by diffusing light effectively and improving brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a thick diffusion plate is used to reduce the mura phenomenon, then brightness uniformity is improved, but device thickness is increased
Solution Approach 1:
The patent replaces the conventional thick diffusion plate with a thin film diffusion member that has light-diffusing particles dispersed in a transparent resin layer. This thin film structure achieves the required light diffusion effect while dramatically reducing the thickness from millimeters to micrometers, directly resolving the contradiction between brightness uniformity and device thickness.
Solution Approach 2:
The patent changes the physical parameters of the diffusion member by using a thin film structure with specific particle concentrations and size distributions. By optimizing the particle density, size, and dispersion within the thin resin layer, the patent achieves effective light diffusion without requiring increased thickness, thus resolving the contradiction between diffusion effectiveness and thickness reduction.
2Illumination intensity
If the optical gap between diffusion plate and reflection plate is increased to reduce mura phenomenon, then brightness uniformity is improved, but device thickness is increased
Solution Approach 1:
The patent eliminates the need for a large optical gap by using a thin film diffusion member with embedded light-diffusing particles. These particles scatter light within the thin film itself, achieving uniform brightness distribution without requiring increased spacing between the diffusion member and reflection plate, thus resolving the contradiction between brightness uniformity and optical gap thickness.
Solution Approach 2:
The light-diffusing particles embedded in the thin film act as intermediaries that scatter and redistribute light within the film structure itself. This internal light scattering mechanism replaces the need for a large optical gap, achieving brightness uniformity through the intermediary particles rather than through increased spatial separation.
3Length of stationary object
If a thin diffusion member is used to reduce device thickness, then device thickness is reduced, but structural support becomes insufficient
Solution Approach 1:
The patent creates a composite structure by dispersing light-diffusing particles within a transparent resin matrix to form the thin film diffusion member. This composite material approach provides both the required optical diffusion function and sufficient mechanical strength within a thin structure, resolving the contradiction between thickness reduction and structural support.
Solution Approach 2:
The thin film diffusion member is designed with appropriate resin material properties and particle reinforcement to provide sufficient structural support despite its reduced thickness. The film structure incorporates light-diffusing particles that also contribute to the mechanical integrity, enabling the thin film to support itself and adjacent components without requiring a thick plate structure.
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 significantly reduces the overall thickness of the liquid crystal display device while suppressing the mura phenomenon and enhancing brightness uniformity, achieving a thickness reduction and improved display quality.
Implementation Method 1
a diffusion member above and spaced away from the plurality of light sources, configured to diffuse light emitted from the plurality of light sources
Data Source
AI summary
Provided is a liquid crystal display device. The liquid crystal display device includes a guide frame, a plurality of light sources disposed on the guide frame, a diffusion member disposed above the plurality of light sources as being spaced away from the plurality of light sources, and a plurality of wires disposed between the plurality of light sources and the diffusion member. The liquid crystal display device according to an exemplary embodiment of the present disclosure uses the diffusion member having a smaller thickness than a related art diffusion plate. Thus, it is possible to reduce the overall thickness of the liquid crystal display device. Further, it is possible to support the diffusion member with the plurality of wires.