Curved Display Light Guide Plate Dot Density Optimization
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Solution Overview
Problem
Conventional side-edge curved modules suffer from poor luminance uniformity due to misalignment of black matrix and data lines during panel curvature, leading to dark zones at the ends and brighter centers, which affects the overall module quality and requires costly modifications and increased backlighting expenditure.
Innovation Solution
The method involves dividing the display zone of a curved panel into grid cells and corresponding light guide plate cells with varying dot densities, where the dot density of peripheral cells is adjusted relative to the central cell's transmittance to ensure uniform luminance distribution, with densities set between 0.25 and 4 times that of the central cell's, optimizing light transmission and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the panel is curved to create a curved module, then the module achieves a unique appearance and curved display, but the black matrix and data lines misalign causing dark zones at the ends and poor luminance uniformity
Solution Approach 1:
The patent applies local quality by creating non-uniform dot densities in different regions of the light guide plate. Specifically, the peripheral regions have higher dot densities while the central region has lower dot density, compensating for the misalignment effects that occur locally at the curved panel edges. This localized adjustment of light extraction properties resolves the luminance uniformity issue without affecting the overall curved shape.
2Manufacturing precision
If the width of the black matrix is increased to compensate for misalignment, then alignment coverage is improved, but the overall transmittance of the panel decreases and overall luminance is reduced
Solution Approach 1:
The patent changes the parameter of dot density in the light guide plate to compensate for alignment issues. Instead of modifying the black matrix width, the invention adjusts the density of light-extracting dots in peripheral regions, thereby maintaining high overall luminance while achieving the necessary alignment coverage through optical compensation rather than structural enlargement.
3Illumination intensity
If additional backlighting is added to increase module luminance, then overall luminance is improved, but design expenditures and device complexity increase
Solution Approach 1:
The patent uses local quality by implementing region-specific dot densities within the existing light guide plate structure. The peripheral regions have increased dot density to compensate for light loss at the curved edges, while the central region maintains normal dot density. This localized optimization achieves uniform luminance distribution without requiring additional backlighting components or increased overall luminance output.
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 enhances luminance uniformity across the module, eliminating dark zones and improving product quality without increasing design expenditures, resulting in a more acceptable and uniform display.
Implementation Method 1
The function of the light guide plate is guiding the direction of scattering of light in order to enhance the luminance of the panel and achieve uniformity of luminance of the panel
Implementation Method 2
The surface of the light guide plate is quite smooth and flat so that most of the internal light gets regularly total reflection on the flat and smooth surface without transmitting outside the light guide plate
Data Source
AI summary
The present invention relates to a method for improving luminance uniformity of a side-edge curved module. The method includes: (1) dividing a display zone of a curved panel display zone into a plurality of panel grid cells and sequentially marking the plurality of grid cells as panel grid cells 1-n, where n is a natural number; (2) dividing a light guide plate located exactly under the curved panel display zone into a plurality of corresponding light guide plate grid cells, each of the light guide plate grid cells having a dot density being indicated by Pn; (3) measuring transmittance of each of the panel grid cells, the transmittance of each of the panel grid cells being indicated by tn; and (4) taking the transmittance tc of the panel grid cell c that is located close to a center of the curved panel display zone as a reference, where c is a natural number less than n and the dot density of the light guide plate grid cell c corresponding to the panel grid cell c is indicated by Pc, wherein the dot density Pn of a light guide plate grid cell n is set between Pc×0.25×tc/tn to Pc×4×tc/tn. The present invention helps eliminate dark zones of a curved module and improves the luminance uniformity without increasing the product design expenditure.