Backlight Diffuser Plate Bending Prevention
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Solution Overview
Problem
Conventional backlight devices for liquid crystal displays face challenges in maintaining uniform luminance due to bending of diffuser plates, which affects image quality, especially in larger displays, and existing solutions either fail to prevent bending or introduce light leakage or visibility issues.
Innovation Solution
A backlight device configuration that includes a diffuser plate with recessed portions and supporting members engaged to these recessed portions, where the supporting members are made of transparent materials with adjusted transmittance to match the diffuser plate, preventing bending and ensuring uniform luminance distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the diffuser plate is made larger to meet demand for enlarging screen, then the display area is increased, but the diffuser plate bends by its own weight causing non-uniform luminance
Solution Approach 1:
The diffuser plate is divided into multiple regions with different thicknesses. Thinner regions are positioned near the edges to reduce weight and prevent bending, while thicker regions are positioned near the center to maintain structural integrity and luminance uniformity.
Solution Approach 2:
Different portions of the diffuser plate have different thickness characteristics. The edge portions are made thinner to reduce self-weight bending, while the central portions maintain adequate thickness for optical performance. This local variation in thickness optimizes both structural stability and luminance uniformity across the large display area.
2Stability of the object's composition
If spacers are used to prevent bending, then diffuser plate stability is improved, but the spacers cause light leakage and visibility issues
Solution Approach 1:
The harmful spacers that cause light leakage are removed from the system. Instead, the invention uses a thickness-patterned diffuser plate design where the plate itself is made thinner at the edges to achieve bending prevention without introducing foreign objects that would cause light leakage or visibility problems.
3Length of stationary object
If the distance between light sources and diffuser plate is shortened to thin the backlight device, then the device thickness is reduced, but lamp images appear on the screen deteriorating image quality
Solution Approach 1:
The diffuser plate has different thicknesses at different locations, with thinner edges and thicker center. This local variation allows the plate to be positioned closer to the light sources while the thinner edges prevent excessive light concentration that would cause lamp images, maintaining luminance uniformity even at reduced distances.
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 effectively maintains uniform luminance across the liquid crystal display by preventing diffuser plate bending and minimizing light leakage, enhancing image quality without compromising visibility.
Implementation Method 1
the supporting members are made of transparent materials with adjusted transmittance to match the diffuser plate
Implementation Method 2
transparent materials with adjusted transmittance to match the diffuser plate
Data Source
AI summary
A backlight device includes a housing, a light source, a diffuse plate and a fixing member. The housing has an open surface. The light source is arranged in the housing. The diffuser plate is arranged on the open surface of the housing and allows light emitted from the light source to pass therethrough while diffusing the light. The fixing member prevents the diffuser plate from bending in a direction in which light passes through the diffuser plate. A part of the fixing member has transmittance adjusted to substantially equalize luminance distribution of light passed through the diffuser plate.