Blue Sub-Pixel Voltage Modulation for LCD Color Shift Correction
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Solution Overview
Problem
Conventional large-size liquid crystal display devices with vertical alignment or in-plane switching liquid crystals suffer from severe color shift at large viewing angles due to rapid brightness saturation, and existing solutions that address this issue, such as polarity inversion, require additional metal traces and thin film transistor elements, reducing the light-transmittance and increasing backlight costs.
Innovation Solution
The display device alternates the drive voltage of blue sub-pixels between higher and lower than a predetermined grayscale voltage in continuous frame display cycles, leveraging the human eye's reduced sensitivity to blue resolution to adjust liquid crystal molecule deflection directions, thereby improving color accuracy without the need for additional metal traces or thin film transistor elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarity inversion technology is adopted to improve color shift at large viewing angles, then color shift problem is improved, but light-transmittance is reduced due to additional metal traces and thin film transistor elements
Solution Approach 1:
The patent changes the voltage parameter of blue sub-pixels dynamically across different frame cycles. By alternating between higher voltage (causing liquid crystal molecules to deflect toward blue color filter) and lower voltage (causing deflection toward colorless polarizer), the patent achieves polarity inversion effect without adding physical structures, thereby maintaining light-transmittance while improving color shift performance at large viewing angles.
2Reliability
If polarity inversion technology is adopted to improve color shift at large viewing angles, then color shift problem is improved, but manufacturing cost increases due to additional metal traces and thin film transistor elements
Solution Approach 1:
The patent implements polarity inversion through voltage parameter modulation rather than structural modification. By controlling the drive voltage of blue sub-pixels to alternate between higher and lower levels across frame cycles, the patent achieves the desired optical effect without requiring additional metal traces or thin film transistor elements, thereby avoiding increased manufacturing complexity and backlight cost.
3Reliability
If drive voltage of blue sub-pixel is adjusted to change liquid crystal molecule deflection directions, then color stability at large viewing angles is improved, but aperture ratio may be affected
Solution Approach 1:
The patent utilizes the existing blue color filter and liquid crystal molecule properties to achieve color correction. By leveraging the interaction between voltage-controlled liquid crystal deflection and the existing blue color filter, the patent improves color stability without requiring additional optical layers or structures that would reduce aperture ratio.
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 the color stability of liquid crystal display panels at large viewing angles while maintaining or improving the aperture ratio, thus reducing the backlight cost and enhancing display quality.
Implementation Method 1
the deflection directions of the liquid crystal molecules corresponding to the blue sub-pixel at the same position on the display panel change in the m frame display cycles
Data Source
AI summary
The present disclosure provides a driving method of a display device and a display device. The driving method comprising: acquiring a pre-display image, wherein each of sub-pixels in the pre-display image corresponds to a predetermined grayscale voltage; displaying the same pre-display image in continuous m frame display cycles, wherein in at least one frame display cycle of the m frame display cycles, a drive voltage of a blue sub-pixel on a display panel of the display device is higher than the predetermined grayscale voltage corresponding to the blue sub-pixel; in at least one frame display cycle of the m frame display cycles, the drive voltage of the blue sub-pixel at a same position on the display panel is lower than the predetermined grayscale voltage corresponding to the blue sub-pixel.