LCD Sub-Pixel Voltage Compensation for Color Shift
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) suffer from color shift issues, particularly when viewed from wide angles, due to the deviation in transmittance curves, making it difficult to maintain accurate color representation, especially for Asian skin tones, and existing solutions are not flexible enough to adjust capacitance parameters post-manufacturing.
Innovation Solution
A novel LCD structure with a simple pixel design that includes at least two sub-pixels with different voltages, where the voltage difference between sub-pixels is adjusted using a compensation capacitor and scanning signal waveforms, allowing for easy adjustment of the voltage difference without modifying structural parameters, using either two-level or four-level driving signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If MVA technique is used to provide wide viewing angle, then view angle and contrast ratio are improved, but color shift occurs due to deviation in transmittance curves
Solution Approach 1:
The pixel is divided into two sub-pixels with different capacitance parameters (Ccp1 and Ccp2), allowing each sub-pixel to have different voltage characteristics. This segmentation enables compensation for the transmittance curve deviation that causes color shift while maintaining the wide viewing angle benefits of MVA technology
Solution Approach 2:
Different capacitance parameters are assigned to different sub-pixels within the same pixel structure. Specifically, one sub-pixel has capacitance parameter Ccp1 and the other has Ccp2, creating local differences in electrical characteristics that compensate for the viewing angle-induced color shift
2Manufacturing precision
If capacitance parameters are modified during manufacturing to compensate color shift, then color accuracy is improved, but flexibility is reduced as parameters cannot be adjusted post-manufacturing
Solution Approach 1:
The invention introduces a controllable element (such as a transistor or switchable capacitor) that allows the capacitance parameters to be dynamically adjusted after manufacturing. This enables post-manufacturing tuning of the voltage difference between sub-pixels to optimize color compensation for different viewing conditions and applications
3Manufacturing precision
If multiple voltage supplies are provided to adjust voltage difference between sub-pixels, then color shift compensation is improved, but device complexity increases
Solution Approach 1:
The invention combines the voltage control function into a single integrated circuit or control mechanism that manages both sub-pixels. By merging the control logic and using shared control lines, the system achieves precise voltage difference adjustment without requiring separate voltage supplies for each sub-pixel, thus reducing overall device complexity
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 effectively compensates for color shift by generating appropriate voltage differences between sub-pixels, ensuring accurate color representation across various viewing angles and allowing for flexible adjustment post-manufacturing, thereby enhancing the display's performance and usability.
Implementation Method 1
One of the two sub-pixels includes a compensation capacitor that is coupled to a second scanning line of the two adjacent scanning lines
Data Source
AI summary
A low color shift liquid crystal display and a driving method thereof are provided. The liquid crystal display comprises a plurality of data lines; a plurality of scanning lines arranged across the plurality of data lines, two adjacent scanning lines and two adjacent data lines arranged across the two adjacent scanning lines together defining a pixel region; and a plurality of pixels each comprising a first and a second sub-pixels. The first sub-pixel is connected to a first scanning line of the two adjacent scanning lines, the second sub-pixel includes a compensation capacitor, which is coupled to a second scanning line of the two adjacent scanning lines. Thereby a voltage difference can be maintained between the two sub-pixels under the same driving condition, and the voltage difference can be easily adjusted by suitably changing the waveforms of scanning drive signals on the scanning lines.