Curved LCD Edge White Pixel Size Reduction
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Solution Overview
Problem
Curved liquid crystal display (LCD) devices experience light leakage and spots at the edge portions due to phase retardation and birefringence, which deteriorate display quality and luminance.
Innovation Solution
Incorporating a fourth color pixel area with a white filter at the edge portion, which is smaller than the red, green, and blue pixel areas, and using wider light blocking members adjacent to the white filter to prevent light leakage, while maintaining the same size for the white filter as the other color filters in the center portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white pixel area is added at the edge portion to increase luminance, then display brightness is improved, but light leakage and spots occur due to phase retardation and birefringence
Solution Approach 1:
The patent applies local quality by making the white pixel area at the edge portion smaller than the pixel areas at the center portion. This local differentiation in size allows the edge white pixels to avoid phase retardation and birefringence issues while center pixels maintain full size for optimal luminance. The light blocking members are also made wider at edge portions to provide additional light leakage prevention where needed.
Solution Approach 2:
The patent changes the parameter of pixel area size specifically for white pixels at edge portions, making them smaller than both colored pixels at edges and white pixels at centers. This parameter modification (size reduction) directly addresses the phase retardation problem that causes light leakage in curved display edge regions, while still maintaining the luminance enhancement benefit of having white pixels.
2Object-affected harmful factors
If the white pixel area at the edge portion is made smaller to prevent light leakage, then light leakage is reduced, but the luminance enhancement effect is diminished
Solution Approach 1:
The patent maintains luminance enhancement by placing white pixels at edge portions even though they are smaller than center white pixels. The local quality principle allows different sizes at different locations - edge white pixels are smaller to prevent light leakage, while center white pixels are full size for maximum luminance. This spatial differentiation resolves the contradiction between preventing light leakage and maintaining luminance enhancement.
Solution Approach 2:
The patent introduces asymmetry in the display structure by having different pixel area sizes at different locations (center vs. edge) and different sizes for different pixel types (colored vs. white at edges). This asymmetric design allows the system to optimize for both luminance enhancement and light leakage prevention simultaneously, rather than using a uniform pixel size throughout.
3Object-affected harmful factors
If wider light blocking members are used at the edge portion adjacent to the white filter, then light leakage is prevented, but device complexity increases
Solution Approach 1:
The patent applies local quality by making light blocking members wider only at edge portions where light leakage occurs, while keeping them at standard width at center portions. This localized modification provides light leakage prevention exactly where needed without unnecessarily complicating the entire display structure. The asymmetric light blocking member design matches the asymmetric light leakage problem.
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 configuration effectively reduces light leakage and maintains display quality by adjusting the size of the white pixel area at the edge portion, preventing phase retardation-induced issues without altering color coordinates.
Implementation Method 1
The LCD may generate an electric field in the liquid crystal layer by applying a voltage to the field generating electrodes
Implementation Method 2
determine an alignment of liquid crystal molecules of the liquid crystal layer through the generated electric field
Implementation Method 3
display an image by controlling the polarization of incident light
Implementation Method 4
The red filter, the green filter, the blue filter, and the white filter may include the same size
Data Source
AI summary
A curved display device includes a first substrate, a second substrate facing the first substrate, a liquid crystal layer disposed between the first substrate and the second substrate, and a first color pixel area, a second color pixel area, a third color pixel area, and a fourth color pixel area disposed on the first substrate or the second substrate, in which the first substrate and the second substrate each includes a center portion and an edge portion surrounding the center portion, the first, second, and third color pixel areas include a red filter, a green filter, and a blue filter, respectively, the fourth color pixel area include a white filter, and the fourth color pixel area is disposed at the edge portion of the first or second substrate, and is smaller than each of the first, second, and third color pixel areas.