Liquid Crystal Display Sub-Pixel Driving Circuit
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Solution Overview
Problem
Conventional liquid crystal displays suffer from color-shift due to a single driving voltage per frame period, leading to varying transmittance and grey levels when viewed from different angles, which degrades image quality.
Innovation Solution
A liquid crystal display with a pixel divided into two sub-pixels, each controlled by separate switch circuits and driven by distinct voltages, compensating for view-angle characteristics to reduce color-shift and enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single driving voltage is provided to a pixel during a frame period, then the device complexity is reduced, but color-shift occurs due to varying transmittance at different view-angles
Solution Approach 1:
The pixel is divided into two sub-pixels (first sub-pixel and second sub-pixel), each controlled by separate switch circuits. The first switch circuit is controlled by the Nth scan line while the second switch circuit is controlled by the (N+1)th scan line. This segmentation allows different driving voltages to be applied to different sub-pixels, compensating for view-angle characteristics and reducing color-shift.
2Object-affected harmful factors
If different driving voltages are applied to different sub-pixels to compensate for view-angle characteristics, then color-shift is reduced, but the device complexity increases
Solution Approach 1:
The first and second switch circuits are merged into a unified pixel structure, sharing common elements such as the liquid crystal capacitor and control transistors. The scan lines are sequentially activated during the frame period, with the first switch circuit operating during the first period and the second switch circuit during the second period, reducing overall circuit complexity while maintaining the ability to apply different driving voltages.
3Object-affected harmful factors
If the pixel is divided into two sub-pixels with separate control, then the view-angle characteristics are averaged to reduce color-shift, but the manufacturing precision requirements increase
Solution Approach 1:
The first and second sub-pixels are positioned at different locations within the pixel structure, with the first sub-pixel associated with the Nth scan line and the second sub-pixel with the (N+1)th scan line. Each sub-pixel has optimized local characteristics that, when combined, provide averaged view-angle performance. This local differentiation allows manufacturing tolerances to be managed at the sub-pixel level rather than requiring perfect symmetry.
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 solution effectively minimizes color-shift by averaging the view-angle characteristics of the sub-pixels, optimizing grey levels and transmittance across different viewing angles, thereby improving the overall image quality of the display.
Implementation Method 1
the corresponding liquid crystal tilts to an angle and results in color-shift due to the change in the view-angle
Implementation Method 2
under the same driving voltage or the same grey level, different view-angles will result in different levels of transmittance
Data Source
AI summary
A liquid crystal display including a number of scan lines, a number of data lines, a pixel, a first switch circuit, and a second switch circuit is provided. The scan lines include an Nth scan line and an (N+1)th scan line, where N is a positive integer. The pixel includes a first sub-pixel and a second sub-pixel. The first switch circuit is coupled to both the Nth scan line and the (N+1)th scan line and is used for controlling the second sub-pixel. The second switch circuit is coupled to the Nth scan line and is used for controlling the first sub-pixel. The pixel is used for displaying a red, a green, a blue, or a white color.