Liquid Crystal Display Pixel Row Grouping and Scan Timing
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Solution Overview
Problem
Liquid crystal display devices experience display unevenness due to the driving method where gate bus lines are selected in a group by group manner with a common scan signal voltage, leading to inconsistencies in pixel charging and display quality.
Innovation Solution
A liquid crystal display device with a matrix pattern of pixels, where pixel rows are grouped and selected using a common scan signal voltage, with specific timing and polarity control of display signal voltages to synchronize the charging of pixels across different source bus lines, ensuring uniform voltage distribution and minimizing feedthrough effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If gate bus lines are selected in a two by two manner with common scan signal voltage, then charge time for each pixel is extended, but display unevenness occurs
Solution Approach 1:
The pixel rows are divided into multiple groups, where each group contains N pixel rows that are selected simultaneously by a common scan signal voltage. By controlling the timing of scan signal voltage switching for different groups, the patent segments the charging process to ensure uniform display while extending charge time.
Solution Approach 2:
The patent applies preliminary action by controlling the scan signal voltage switching timing in advance. Specifically, the scan signal voltage for one group is switched before the scan signal voltage for another group, ensuring that pixels are charged uniformly before display occurs, thereby preventing display unevenness.
2Manufacturing precision
If vertical scanning period is shortened for high-definition display, then display quality is improved, but charge time for each pixel becomes insufficient
Solution Approach 1:
The patent merges multiple pixel row selections into simultaneous operations. By selecting N pixel rows within each group simultaneously using a common scan signal voltage, the charging process is accelerated, allowing sufficient charge time even when the vertical scanning period is shortened for high-definition displays.
Solution Approach 2:
The patent employs periodic action through multi-speed driving methods (2x-speed, 4x-speed driving) where the vertical scanning frequency is increased. By combining this with grouped row selection, the system maintains adequate charge time while achieving higher refresh rates and improved display quality.
3Duration of action of moving object
If multiple source bus lines are provided for each pixel column, then charge time is extended, but device complexity increases
Solution Approach 1:
The patent segments the pixel rows into groups that are selectively activated. By controlling which groups are selected at different times, the system effectively utilizes multiple source bus lines without requiring all of them to be active simultaneously, thereby extending charge time while managing device complexity.
Data Source
AI summary
In a liquid crystal display device (100), each pixel row group is selected by a common scan signal voltage, each pixel row group including N pixel rows which adjoin one another in a column direction. Where two pixel rows which adjoin each other in a column direction and which are included in different pixel row groups are a first pixel row and a second pixel row, the first pixel row includes a pixel which has a pixel electrode (16) capacitively coupled with a gate bus line (12) which is associated with the second pixel row. When the first pixel row is included in the qth group, the second pixel row is included in the (q+1)th group. A scan signal voltage supplied to gate bus lines which are associated with the (q+1)th group switches from low to high before a scan signal voltage supplied to gate bus lines which are associated with the qth group switches from high to low.