Display Driving Voltage Adjustment for Color Cast Reduction
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Solution Overview
Problem
Liquid crystal display (LCD) devices face issues with color cast due to varying refractive indices and wavelengths, leading to poor color saturation and brightness, especially at low gray scales, which affects image quality.
Innovation Solution
A driving method and apparatus that adjusts gray scale display voltages by acquiring a target color scheme, deleting low gray scale voltages corresponding to color cast, and redistributing original voltages to improve color cast image quality, specifically addressing severe color casts in red, green, and blue colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If voltage drive is changed from high voltage to low voltage, then power consumption is reduced, but color saturation and brightness deteriorate
Solution Approach 1:
The patent changes the voltage parameter distribution across gray scales by deleting low gray scale voltages and redistributing original voltages. This reparameterization allows the display to maintain color brightness at lower power consumption levels by optimizing which gray scales receive voltage adjustments.
Solution Approach 2:
The patent applies different voltage adjustment strategies to different gray scale levels. Specifically, low gray scales that cause color casts are deleted and compensated, while high gray scales maintain their original characteristics. This localized approach preserves color brightness where needed while reducing overall power consumption.
2Illumination intensity
If low gray scale voltages are deleted to improve color brightness, then color saturation is enhanced, but the number of displayable gray scales is reduced
Solution Approach 1:
The patent extracts and removes the problematic low gray scale voltages that cause color casts from the voltage distribution system. By taking out these specific voltage levels (e.g., deleting voltages below a threshold), the patent eliminates the source of color saturation problems while redistributing the remaining voltages to maintain adequate gray scale coverage.
Solution Approach 2:
The patent transforms the one-dimensional gray scale voltage sequence into a reorganized voltage distribution by deleting certain levels and redistributing others. This dimensional reorganization allows the system to skip problematic gray scale transitions while maintaining overall display quality through compensatory voltage allocation.
3Manufacturing precision
If gray scale voltages are redistributed to eliminate color casts, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary voltage mapping and deletion of problematic gray scales during the display initialization or setup phase. By pre-calculating and storing the optimized voltage distribution table that eliminates color casts, the actual display operation becomes simpler, as it only needs to look up pre-computed values rather than performing complex real-time voltage adjustments.
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 method effectively improves color cast image quality by deleting low gray scales that affect brightness, resulting in enhanced color saturation and brightness across different gray scales, particularly at low gray levels.
Implementation Method 1
the transmittance of different wavelengths is related to the phase delay, which shows different degrees of performance of the transmittance and the wavelength
Implementation Method 2
due to the relevance between refractive index and wavelength
Implementation Method 3
with the change of voltage drive, different wavelength phase delays will also have varying degrees of changes that impact the transmittance of different wavelengths
Data Source
AI summary
A driving method and an apparatus for a display apparatus, the driving method includes: acquiring a target color scheme to be adjusted; acquiring original gray scale display voltages corresponding to the target color scheme in an input signal and color cast gray scale display voltages corresponding to a color cast generated in the target color scheme; deleting parts of the original gray scale display voltages corresponding to the target color scheme and less than the color cast gray scale display voltages, thus obtaining map gray scale display voltages corresponding to the target color scheme; distributing the original gray scale display voltages corresponding to the target color scheme to the map gray scale display voltages corresponding to the target color scheme.