Display Panel Data Driver Alternating Charge Modes
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Solution Overview
Problem
In Half Source Driver (HSD) display panels, the increased scan line frequency and RC signal delay cause uneven sub-pixel charging, resulting in vertical bright and dark lines due to the non-ideal square wave data signal waveform, leading to display uniformity issues.
Innovation Solution
A display panel design with intersecting scan and data lines, featuring a data driver that controls a square wave data signal with sub-waveforms and alternating charge modes between frames to ensure balanced sub-pixel brightness, using a first drive mode and a second drive mode to invert the data signal polarity at different times, thereby achieving uniform display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If HSD technology is used to reduce data lines by half, then the number of data lines is reduced, but the number of scan lines is doubled causing display uniformity issues
Solution Approach 1:
The patent applies periodic action by alternating between first and second drive modes in different frames. The data driver periodically switches between charging first sub-pixels through starting ends and second sub-pixels through trailing ends, creating a periodic compensation mechanism that eliminates cumulative brightness differences and ensures long-term display uniformity
Solution Approach 2:
The patent changes the drive mode parameter between frames. By switching between first drive mode (charging first sub-pixel through starting end, second through trailing end) and second drive mode (opposite assignment), the system dynamically adjusts charging parameters to compensate for RC delay effects and maintain uniform display performance
2Quantity of substance
If scan lines are doubled in HSD, then data lines can be reduced by half, but sub-pixel opening time is shortened causing charge differences
Solution Approach 1:
The patent uses copying by creating complementary charge patterns through alternating drive modes. The first drive mode creates a charge distribution pattern, while the second drive mode creates an inverted pattern, and their alternation copies and cancels out the harmful charge differences caused by shortened opening times
Solution Approach 2:
The patent converts the harmful effect of RC delay and shortened opening time into a beneficial compensation mechanism. By deliberately alternating between drive modes that exploit the RC delay effect in opposite directions, the system transforms the原本的缺陷 into a solution that achieves uniform display
3Speed
If data signal has RC delay effect, then signal transmission is achieved, but waveform becomes non-ideal causing uneven charging
Solution Approach 1:
The patent applies inversion by reversing the charge assignment between sub-pixels in alternating frames. Instead of always charging the same sub-pixel through the same part of the waveform, the system inverts the assignment between first and second drive modes, causing the RC delay effects to cancel out over time and achieve uniform charging
Data Source
AI summary
The data driver of the display panel of the present disclosure is configured to control an output mode of a data signal, and the output mode includes a first drive mode and a second drive mode. In different frames, data signals are outputted according to the first drive mode and second drive mode, respectively.