Display Panel Precharge Signal for Half-Source Driving Uniformity
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Solution Overview
Problem
In half-source driving (HSD) display panels, the RC signal delay causes uneven charging of sub-pixels, resulting in display uniformity issues such as vertical bright-dark lines due to the shortened turn-on time and charge difference.
Innovation Solution
A display panel with a driving module that provides a precharge signal with the same polarity as the scan signal prior to the scan signal, ensuring sufficient charging of sub-pixels by inverting the data signal polarity after a defined time, thereby compensating for the RC signal delay and improving display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If half-source driving is implemented to reduce data lines, then the number of data lines is reduced by half, but the turn-on time of sub-pixels is shortened causing display uniformity issues
Solution Approach 1:
The patent applies preliminary action by providing a precharge signal to sub-pixels before the main scan signal arrives. This precharge signal charges the sub-pixels in advance during the period when the data line is still charging, ensuring that when the scan signal turns on the sub-pixel, it is already sufficiently charged. This resolves the contradiction by compensating for the shortened turn-on time while maintaining the half-source driving configuration.
2Quantity of substance
If scan lines are doubled in HSD configuration, then data lines can be reduced by half, but charge difference between sub-pixels becomes obvious resulting in vertical bright-dark lines
Solution Approach 1:
The precharge signal is provided in advance to compensate for the RC delay effect that causes charge differences between sub-pixels. By charging sub-pixels beforehand, the patent ensures uniform charging levels across all sub-pixels, eliminating the vertical bright-dark lines while maintaining the reduced data line configuration.
Solution Approach 2:
The patent changes the timing parameter of signal provision by introducing a precharge phase before the main scan phase. This parameter change in signal timing allows sub-pixels to be charged sufficiently despite the shortened turn-on time, thereby improving display uniformity while maintaining the half-source driving structure.
3Reliability
If data signal has RC delay effect, then signal transmission is realistic, but sub-pixels at different positions are charged unevenly causing brightness inconsistency
Solution Approach 1:
The patent provides a precharge signal before the main data signal to compensate for RC delay effects. This preliminary charging ensures that all sub-pixels, regardless of their position on the data line, receive sufficient charge before activation. The precharge signal timing is specifically designed to account for the RC time constant, ensuring uniform brightness across the display while maintaining reliable signal transmission.
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 precharge signal effectively addresses the uneven charging issue, ensuring that sub-pixels are sufficiently charged, which enhances display uniformity and reduces brightness inconsistencies.
Implementation Method 1
Due to the delay effect of the RC signal, the waveform of the data signal is not an ideal square wave but has a starting end and a trailing end
Implementation Method 2
the polarity of the data signal is inverted for one time after one T, and is inverted every mT
Data Source
AI summary
A display panel of the present application comprises a driving module. The driving module controls a scan line connected to a sub-pixel to provide a scan signal, and a precharge signal sent earlier than the scan signal. A data signal has the same polarity when the scan line is providing the precharge signal and the scan signal. When the display panel is being driven, the precharge signal can be provided to the sub-pixel before the scan signal is provided to the sub-pixel, and when the polarity of the data signal is the same as the polarity of the data signal when the scan signal is provided to the sub-pixel, so as to turn on and precharge the sub-pixel.