Display Panel Driving Method for Large-Angle Color Shift
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Solution Overview
Problem
Large-viewing angle color shift in VA-type liquid crystal display panels due to non-linear brightness change with voltage, leading to deviated gray scales and increased manufacturing costs when attempting to mitigate this with additional metal wires and drive parts.
Innovation Solution
A driving method for display panels that alternates high and low voltage drive signals across adjacent pixels, with specific polarity arrangements to maintain brightness consistency and reduce color shift without additional metal wires or increased costs, ensuring balanced high and low voltage sub-pixel distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If double metal wires and drive parts are provided to drive the secondary pixel, then the color shift at large viewing angle is reduced, but the light transmitting aperture region is sacrificed and the transmittance of the panel is affected
Solution Approach 1:
The patent merges the drive functions for main pixels and secondary pixels into a single metal wire structure. The same metal wire that drives the main pixel also drives the secondary pixel by extending through the aperture region, eliminating the need for separate metal wires and drive parts for secondary pixels. This combining approach reduces the number of metal wires while maintaining the ability to drive both pixel types independently with different voltages.
Solution Approach 2:
The metal wire structure is designed to serve multiple functions: it acts as both the drive electrode for main pixels and the drive electrode for secondary pixels. By making the metal wire extend through the aperture region and providing both high voltage and low voltage drive capabilities, the same structural element performs multiple drive functions, reducing overall device complexity and preserving aperture area.
2Object-affected harmful factors
If double metal wires and drive parts are provided to drive the secondary pixel, then the color shift at large viewing angle is reduced, but the cost is higher
Solution Approach 1:
The patent combines the drive structures for main pixels and secondary pixels into a unified metal wire system. Instead of fabricating separate metal wires and drive parts for secondary pixels, the design uses the existing metal wire infrastructure to drive both pixel types, reducing manufacturing steps and material costs while maintaining the dual-voltage drive capability needed to reduce color shift.
Solution Approach 2:
The metal wire and drive circuitry are designed with multi-functionality to handle both main pixel and secondary pixel driving requirements. This universal design approach allows a single drive structure to perform multiple functions, reducing the total component count and associated manufacturing costs while still enabling independent voltage control for color shift correction.
3Stability of the object's composition
If the brightness of the pixel is fast saturated along with the voltage at large viewing angle, then the VA type liquid crystal technology principle is maintained, but the gray scale presentation is deviated severely
Solution Approach 1:
The patent applies different drive voltages to different spatial locations (main pixels versus secondary pixels) within the same display panel. Main pixels receive higher drive voltages while secondary pixels receive lower drive voltages, allowing each region to be optimized for its specific viewing angle characteristics. This local differentiation compensates for the non-linear brightness saturation at large viewing angles and restores gray scale accuracy without changing the fundamental VA technology.
Solution Approach 2:
The patent changes the drive voltage parameter for secondary pixels relative to main pixels. By applying lower voltages to secondary pixels (which are more affected by large-viewing angle saturation), the system compensates for the non-linear brightness response and maintains accurate gray scale presentation across different viewing conditions while preserving the VA technology's core principles.
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
Achieves normal brightness display and reduces color shift at large viewing angles without extra metal wires or increased costs, maintaining image quality and avoiding color shift issues.
Implementation Method 1
Large-sized liquid crystal display panels mostly adopt a vertical alignment (VA) type or an in plane switching (IPS) type
Implementation Method 2
the brightness of a pixel should be linearly changed along with the change of a voltage in an ideal case
Data Source
AI summary
A driving method of a display panel and a display device are provided. The driving method includes adopting drive data of relatively high voltage and drive data of relatively low voltage respectively for driving any two adjacent pixels; in each of the rows, with adjacent three pixels as a repeater, a polarity arrangement drive adopted by the pixels in a first column is different from a polarity arrangement drive adopted by the pixels in other two columns, the polarity arrangement drive above is one of a first polarity arrangement drive and a second polarity arrangement drive; in each of the columns, the polarity arrangement drive of every two of the pixels is identical; the first polarity arrangement drive and the second polarity arrangement drive are alternately changed with two of the pixels as a repeater. The display device uses such a driving method.