Display Device Data Signal Lines for Voltage Drop Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Large-sized image display devices with active matrix methods experience reduced display quality due to transmission delays and voltage drops in scanning signals, particularly in pixels remote from the gate drive circuit, leading to irregularities on the display screen.
Innovation Solution
The implementation of multiple data signal lines connected exclusively to specific pixel circuit columns, allowing for parallel data signal voltage supply to odd and even-numbered pixel rows, thereby extending the time thin film transistors are in an ON state and reducing voltage drops by distributing light emission periods across the frame period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single data signal line is used for each pixel column, then the device complexity is reduced, but the display quality deteriorates due to transmission delays and voltage drops in pixels remote from the gate drive circuit
Solution Approach 1:
The data signal lines are segmented into multiple independent lines (first data signal line and second data signal line), each serving specific pixel rows. This segmentation reduces the load on individual lines and minimizes transmission delays and voltage drops for remote pixels, thereby improving display quality without significantly increasing overall device complexity.
Solution Approach 2:
Different data signal lines are assigned to different pixel rows (odd-numbered vs. even-numbered rows), allowing each line to be optimized for its specific group of pixels. This local optimization ensures that pixels remote from the gate drive circuit receive adequate signal strength and timing, improving local display quality while maintaining manageable overall complexity.
2Loss of time
If the thin film transistor is kept in ON state for a longer period to ensure timely data writing, then the data signal writing is improved, but the voltage drop increases due to extended current flow
Solution Approach 1:
The pixel rows are divided into two groups (odd and even rows) served by separate data signal lines. This allows the thin film transistors in each group to be activated in alternating periods, reducing the duration each transistor remains in the ON state. Consequently, data writing is completed within shorter intervals, and voltage drops are minimized due to reduced extended current flow.
Solution Approach 2:
The display operation employs periodic alternating activation of odd and even pixel rows through different data signal lines. This periodic action ensures that transistors are switched ON only when needed for their specific row group, optimizing data writing timing while limiting the duration of current flow to prevent excessive voltage drops.
3Manufacturing precision
If multiple data signal lines are provided for parallel supply to odd and even pixel rows, then the display quality is improved by reducing transmission delays, but the device complexity increases
Solution Approach 1:
The pixel matrix is segmented into odd-numbered and even-numbered rows, each served by dedicated data signal lines. This segmentation enables parallel data writing to different row groups, reducing transmission delays for remote pixels and improving display quality. The complexity increase is managed by organizing the segmented lines systematically rather than adding arbitrary additional lines.
Solution Approach 2:
Multiple data signal lines are merged into a coordinated system where the first and second data signal lines work in parallel but are controlled by a unified gate drive circuit. This merging approach allows the system to benefit from multiple lines (reduced transmission delays) while maintaining controlled complexity through integrated control architecture.
Data Source
AI summary
A plurality of data signal lines each of which is connected to at least one pixel circuit in one pixel circuit column and is not connected to the pixel circuits of other pixel circuit columns are provided to one pixel circuit column, and the pixel circuits in the pixel circuit column are connected to any one of the plurality of data signal lines. An image display device having such a constitution can alleviate lowering of display quality attributed to transmission delay or voltage drop of a scanning signal.