Liquid Crystal Display Quad Pixels Light Blocking Patterns
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Solution Overview
Problem
Liquid crystal display devices with quad type pixels experience a color shift and deteriorated display quality at side viewing angles due to varying degrees of light shielding, leading to greenish or yellowish color shifts.
Innovation Solution
The implementation of a liquid crystal display with quad type pixels featuring R, G, and B subpixels arranged differently for each adjacent pixel, combined with light blocking patterns on a transparent glass substrate, to equalize light shielding and prevent color shifts by varying the barrier pattern size and aperture areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the barrier is spaced apart a predetermined gap from W subpixels to guide light to side viewing angle, then narrow viewing angle mode is achieved, but color shift occurs due to varying light shielding degree on RGB subpixels
Solution Approach 1:
The patent applies local quality by creating different aperture regions for R, G, and B subpixels. Specifically, the barrier pattern is designed with varying distances from the W subpixel for each color subpixel, creating larger aperture regions for some colors and smaller for others. This local differentiation compensates for the varying light shielding effects, ensuring uniform color appearance across the display while maintaining narrow viewing angle characteristics.
Solution Approach 2:
The patent employs asymmetry by intentionally designing unequal aperture regions for different color subpixels (R, G, B) within the same pixel structure. The barrier is positioned at different distances from the W subpixel for each color, creating an asymmetric light shielding configuration that compensates for viewing angle-dependent color shifts while maintaining overall color balance.
2Ease of manufacture
If fixed subpixel arrangement is used in quad type pixels, then manufacturing is simplified, but color shift occurs at side viewing angle due to differential light shielding
Solution Approach 1:
The patent maintains a fixed overall subpixel arrangement for ease of manufacture but introduces local quality variations through the barrier pattern design. The barrier creates different aperture regions for R, G, and B subpixels, with each color having a specific aperture size tailored to compensate for its light shielding characteristics, thus achieving color accuracy without complicating the manufacturing process.
3Adaptability or versatility
If W subpixel is turned on in narrow viewing angle mode, then viewing angle control is achieved, but leaked light reduces visibility from side viewing angle
Solution Approach 1:
The patent segments the light output from the W subpixel by creating separate aperture regions for each color subpixel (R, G, B) through the barrier pattern. This segmentation directs light from the W subpixel preferentially toward the front viewing angle while blocking side viewing angle leakage, thus maintaining visibility when the W subpixel is activated for viewing angle control.
Solution Approach 2:
The barrier pattern acts as an intermediary element between the W subpixel and the viewer. It mediates the light from the W subpixel by creating controlled aperture regions that allow front-viewing light passage while blocking side-viewing leaked light, thus enabling viewing angle switching without sacrificing visibility.
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 solution effectively compensates for differences in light shielding, preventing color shifts and enhancing display quality by ensuring consistent visibility across viewing angles.
Implementation Method 1
guides light from the W subpixel toward a side viewing angle to reduce visibility from the sides
Implementation Method 2
a light blocking member (hereinafter, referred to as 'barrier') is disposed on the W subpixel
Implementation Method 3
from the front viewing angle, a leaked light from the W subpixel PW is blocked by the barrier
Data Source
AI summary
Disclosed is a liquid crystal display which can switch between a wide viewing angle and a narrow viewing angle in a quad type pixel structure including white subpixels. The liquid crystal display comprises: a plurality of quad type pixels each having an R subpixel, a G subpixel, a B subpixel, and a W subpixel; and a plurality of light blocking patterns disposed on the W subpixels, for guiding light from the W subpixels to a side viewing angle, wherein the W subpixels are fixed at specific positions of the quad type pixels respectively, and the R, G, and B subpixels have a different arrangement for each of the quad type pixels adjacent horizontally or vertically to each other.