Pixel Segmentation for LCD Viewing Angle and Contrast
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Solution Overview
Problem
Liquid crystal display devices experience a decrease in contrast and viewing angle, along with color shift, due to the limitations of liquid crystal deflection, which affects the transmittance and display quality.
Innovation Solution
A driving method for display devices that involves acquiring color parameters such as hue and saturation, determining correction coefficients based on these parameters, and adjusting the display parameters of primary and secondary pixels to maintain constant overall brightness and chromaticity, thereby increasing the viewing angle and reducing color shift without compromising transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If liquid crystal deflection is increased to improve viewing angle, then viewing angle increases, but contrast decreases and color shift occurs
Solution Approach 1:
The pixel is divided into two independent controllable regions: a first pixel region and a second pixel region. Each region can be independently driven with different voltage levels, allowing the first region to maintain high contrast while the second region extends the viewing angle, thus resolving the contradiction between viewing angle and contrast.
Solution Approach 2:
Different regions of the pixel are assigned different optical properties and driving parameters. The first pixel region uses a first driving voltage to optimize contrast, while the second pixel region uses a second driving voltage to optimize viewing angle. This local differentiation allows each region to perform its specialized function without compromising the other.
2Illumination intensity
If driving voltage is adjusted to improve transmittance, then transmittance increases, but viewing angle and contrast deteriorate
Solution Approach 1:
The pixel is divided into two independently controllable regions that can be driven with different voltage levels. This segmentation allows one region to optimize for transmittance while the other optimizes for viewing angle and contrast, avoiding the need to compromise any single parameter across the entire pixel.
Solution Approach 2:
Different driving voltage parameters are applied to different pixel regions. By changing the voltage parameter locally rather than uniformly across the entire pixel, the system can optimize transmittance in one region while maintaining viewing angle and contrast in another region.
3Device complexity
If uniform driving is applied to all pixels, then device complexity is reduced, but display quality and viewing angle performance deteriorate
Solution Approach 1:
The pixel is segmented into two independently controllable regions, each with its own driving electrode. This segmentation enables differentiated driving strategies for different regions, improving display quality and viewing angle while adding only minimal complexity to the driving circuit.
Solution Approach 2:
Different driving parameters are applied to different regions of the pixel based on their specific functional requirements. The first region receives a first driving voltage optimized for its characteristics, while the second region receives a second driving voltage optimized for its characteristics, achieving high display quality without excessive complexity.
Data Source
AI summary
Disclosed are a driving method of a display device, which includes the following operations: acquiring at least one of a color parameter of a pixel, image frequency and image isolation; determining a correction coefficient according to the color parameter, image frequency and/or image isolation; determining a display parameter according to the correction coefficient; controlling the pixel to display according to the display parameter.