Gate Slope Formation for Display Unevenness Reduction
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Solution Overview
Problem
Display unevenness in display apparatuses driven by gate lines from both ends, where existing gate pulse modulation methods fail to equalize charge amounts among pixels effectively due to drivability variations in gate drive circuits.
Innovation Solution
Incorporating independent first and second gate slope forming sections to generate gate slopes for gate drive signals supplied from both ends of the gate lines, allowing for customized slope settings to equalize charge amounts across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gate drive circuits drive gate lines from both ends to improve signal reach and reduce resistance effects, then the driving capability is improved, but display unevenness occurs due to asymmetrical charge distribution in pixels
Solution Approach 1:
The patent applies local quality by forming different gate slopes for gate drive signals from left and right ends. Specifically, when the left gate drive circuit drives from the left end, a first gate slope is formed; when the right gate drive circuit drives from the right end, a second gate slope is formed. This local differentiation compensates for asymmetrical charge distribution in pixels at different positions, achieving uniform display across the panel while maintaining the benefits of bidirectional driving.
Solution Approach 2:
The patent changes the parameter of gate slope to resolve the contradiction. By dynamically adjusting and differentiating the gate slope parameters for left and right driven pixels, the system compensates for the asymmetrical charge distribution caused by bidirectional driving. This parameter change enables uniform charge amounts across all pixels regardless of their position, maintaining display uniformity while preserving the improved driving capability.
2Manufacturing precision
If existing gate pulse modulation methods are used to improve charge drawing, then some charge uniformity is achieved, but display unevenness persists due to drivability variations in gate drive circuits
Solution Approach 1:
The patent enhances local quality by implementing position-dependent gate slope control. Pixels driven from the left end receive a first gate slope, while pixels driven from the right end receive a second gate slope. This local differentiation addresses drivability variations in gate drive circuits by tailoring the gate signal characteristics to each pixel's specific position and driving direction, thereby achieving uniform display across the entire panel.
Solution Approach 2:
The patent incorporates feedback mechanisms to detect and compensate for drivability variations in gate drive circuits. By monitoring the actual charge distribution and display uniformity, the system adjusts the gate slope parameters for left and right driven pixels accordingly. This feedback loop ensures that despite variations in gate drive circuit performance, uniform display is maintained across the panel.
3Manufacturing precision
If gate slopes are formed independently for left and right driven pixels, then display unevenness is reduced, but circuit complexity increases
Solution Approach 1:
The patent merges the gate slope formation functionality into the existing gate drive circuits. The first and second gate slopes are formed within the gate drive circuits that already exist for bidirectional driving. By combining these functions, the patent achieves display uniformity without adding separate complex circuitry, thus minimizing the increase in device complexity while still providing independent gate slope control for left and right driven pixels.
Data Source
AI summary
A display device (1) includes a display panel (10), a first gate drive circuit (11), a second gate drive circuit (12), a first gate slope formation unit (21), and a second gate slope formation unit (22). A plurality of pixels (3) is arranged in a matrix in the display panel. A plurality of gate lines (GL) for selecting pixel groups arranged along rows (X) is arranged along columns (Y) in the matrix. The first gate drive circuit supplies each gate line with a first gate drive signal from each end of the plurality of gate lines. The second gate drive circuit supplies each gate line with a second gate drive signal from each opposite end of the plurality of gate lines. The first gate slope formation unit forms a gate slope which is a falling slope in the signal waveform of the first gate drive signal. The second gate slope formation unit forms a gate slope of the second gate drive signal independently of the first gate slope formation unit.