Active Matrix Substrate Dual Scanning for LCD Charging Time
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Solution Overview
Problem
The configuration of individual-writing type liquid crystal display devices, where writing is carried out per one pixel row, fails to secure sufficient pixel charging time, particularly in large-sized high-definition or high-speed driven devices, leading to deterioration in display quality.
Innovation Solution
The active matrix substrate is designed with data signal lines extending in a column direction, each column associated with two data signal lines, and pixel electrodes connected via transistors to scanning signal lines, allowing for individual writing to multiple pixel electrodes by selecting scanning signal lines two at a time, thereby extending pixel charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If writing is carried out per one pixel row in individual-writing type liquid crystal display devices, then accurate luminance control of sub-pixels is achieved, but sufficient pixel charging time cannot be secured in large-sized high-definition or high-speed driven devices
Solution Approach 1:
The pixel rows are divided into two groups (odd-numbered rows and even-numbered rows), with each group connected to separate scanning signal lines. This segmentation allows simultaneous writing to two rows at once, effectively doubling the writing throughput and securing sufficient charging time for each pixel while maintaining accurate luminance control.
Solution Approach 2:
The system dynamically switches between different scanning signal lines (first scanning signal line for odd rows, second scanning signal line for even rows) based on the current writing phase. This dynamic allocation of scanning resources enables flexible control of the writing process and optimizes pixel charging time without compromising luminance precision.
2Reliability
If individual writing is implemented per pixel row, then electrically floating pixel electrodes are eliminated and reliability is improved, but pixel charging time becomes insufficient for high-speed drive modes
Solution Approach 1:
By segmenting the scanning signal lines into separate channels for odd and even pixel rows, the system maintains the reliability benefits of individual writing (no floating electrodes) while increasing productivity through parallel processing of two row groups simultaneously.
Solution Approach 2:
The system merges the writing operations of two separate row groups into a single frame period, allowing simultaneous charging of multiple pixel rows. This combining approach increases the effective writing speed and ensures sufficient charging time while preserving the reliability advantages of individual-writing architecture.
3Duration of action of moving object
If scanning signal lines are selected two at a time for individual writing, then pixel charging time is extended, but device complexity increases
Solution Approach 1:
The scanning signal lines are segmented into distinct groups (first and second scanning signal lines) that can be independently controlled and selected. This segmentation enables systematic management of the increased complexity while achieving extended pixel charging time through parallel row writing operations.
Data Source
AI summary
An active matrix substrate is arranged such that each pixel region includes two pixel electrodes, each data signal line extends in a column direction, each column of pixel regions is associated with two data signal lines, one pixel electrode of the pixel region included in the column of pixel regions is connected to one of the two data signal lines via a transistor that is connected to a scanning signal line, the other pixel electrode of the pixel region is connected to the other one of the two data signal lines via a transistor that is connected to another scanning signal line, and one of pixel electrodes included in one of two adjacent pixel regions of the column and one of pixel electrodes included in the other one of the two adjacent pixel regions of the column are connected to an identical scanning signal line via respective transistors.