Liquid Crystal Display Pixel Driving Method for Undercharging
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Solution Overview
Problem
Conventional liquid crystal display panels with dual thin-film-transistor pixels face an undercharging issue due to shared data lines, leading to inadequate luminance and compromised image quality, as the charge ability of left pixels is inferior to right pixels.
Innovation Solution
A method where adjacent pixels in the same row have different charge times, with a longer charge time for the left pixel and a shorter charge time for the right pixel, ensuring both are adequately charged by adjusting the enablement periods of scan lines and using only three thin film transistors per pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dual thin-film-transistor pixels are used to control pixels in the same row sharing a data line, then the aperture ratio is reduced, but the charge ability of left pixels becomes inferior to right pixels causing undercharging
Solution Approach 1:
The patent applies local quality by differentiating the charge time between left pixels and right pixels. Specifically, left pixels are assigned a longer charge time than right pixels, allowing each pixel type to be charged optimally according to its specific characteristics and position in the display array.
Solution Approach 2:
The patent implements dynamics by making the charge time variable rather than fixed. The charge time is dynamically adjusted based on pixel position (left vs. right) and scanning sequence, enabling adaptive charging that compensates for the reduced charge ability of left pixels while maintaining overall display performance.
2Ease of operation
If equal charge time is applied to all pixels sharing a data line, then the driving method is simple, but left pixels become undercharged due to inferior charge ability
Solution Approach 1:
The patent differentiates charge time based on pixel position and type. Left pixels receive a longer charge time than right pixels, creating localized charging optimization that addresses the specific undercharging problem of left pixels while maintaining overall system simplicity.
Solution Approach 2:
The patent changes the charge time parameter dynamically based on pixel position and scanning sequence. By adjusting this critical parameter, the system compensates for the reduced charge ability of left pixels without requiring complex hardware modifications.
3Reliability
If longer charge time is applied to left pixels to compensate for inferior charge ability, then charging adequacy is improved, but overall charge time increases
Solution Approach 1:
The patent applies local quality by assigning different charge times to different pixel types. Only left pixels receive the extended charge time, while right pixels maintain shorter charge times, thereby compensating for charging deficiencies without proportionally increasing the overall charge time for the entire display.
Solution Approach 2:
The patent applies partial action by extending charge time only where necessary (for left pixels) rather than uniformly for all pixels. This selective approach compensates for the specific charging deficiency of left pixels while minimizing the impact on overall charging time.
4Ease of manufacture
If three thin film transistors are used per pixel to maintain high aperture ratio, then manufacturing complexity is reduced, but charge ability becomes insufficient for adequate luminance
Solution Approach 1:
The patent changes the charge time parameter to compensate for the reduced charge ability inherent in three-transistor pixel designs. By extending the charge time, the system ensures adequate voltage delivery to the pixel electrode, thereby maintaining proper luminance output despite the simplified transistor configuration.
Data Source
AI summary
A liquid crystal display panel includes a first scan line, a second scan line, a data line, a first pixel and a second pixel. The first pixel has a first switch, a second switch and a first pixel electrode. The second pixel has a third switch and a second pixel electrode. The driving method of the liquid crystal display panel includes the following steps. During a first time period, the first scan line and the second scan line are enabled at the same time, and a first pixel voltage is inputted to the data line. During a second time period, the first scan line is enabled, the second scan line is disabled, and a second pixel voltage is inputted to the data line. The second time period is shorter than the first time period.