Segmented Source Signal Wires Reduce Vertical Crosstalk in High-Resolution Displays
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Solution Overview
Problem
Active matrix display devices face challenges in accurately writing picture signals and reducing vertical crosstalk as the number of pixel rows and columns increases due to higher resolution, leading to increased load capacitance and leak currents.
Innovation Solution
The implementation of a display device configuration with scanning wires for every N rows, selection control wires for every row, main data wires for every column, and secondary data wires connecting display pixels across columns, utilizing switching elements to manage voltage and capacitance for accurate signal writing and reduced crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixel rows and columns is increased to achieve higher resolution, then display quality is improved, but load capacitance and leak currents increase causing inaccurate picture signal writing and vertical crosstalk
Solution Approach 1:
The source signal wires are divided into multiple segments with different voltage levels. Instead of using a single source signal wire for all pixels in a column, the patent divides them into first source signal wires and second source signal wires with different voltage levels, allowing independent control and reducing signal interference across high-resolution displays
Solution Approach 2:
Storage capacitances are introduced as intermediary elements between the source signal wires and pixel circuits. These capacitances hold the voltage levels temporarily, ensuring stable signal transmission to pixels even when source signal wire voltages differ, thereby preventing vertical crosstalk in high-resolution displays
2Measurement precision
If the number of pixel rows and columns is increased to achieve higher resolution, then display quality is improved, but vertical crosstalk increases
Solution Approach 1:
Source signal wires are segmented into multiple groups with different voltage levels (first source signal wires with first voltage level, second source signal wires with second voltage level). This segmentation prevents voltage interference between adjacent pixels in different columns, reducing vertical crosstalk while maintaining high resolution display quality
Solution Approach 2:
Different voltage levels are assigned to different source signal wires based on their specific column positions. This local differentiation of voltage levels allows each column to operate independently with its own voltage characteristics, preventing signal leakage and vertical crosstalk in high-resolution displays
3Device complexity
If conventional source signal wire configuration is used, then device complexity is low, but picture signal writing becomes inaccurate due to large load capacitance
Solution Approach 1:
The conventional single source signal wire configuration is segmented into multiple source signal wires with different voltage levels. This segmentation reduces the load capacitance on each individual wire, enabling accurate picture signal writing while maintaining a relatively simple overall structure through systematic voltage level assignment
Solution Approach 2:
Multiple source signal wires with different voltage levels serve universal functions of driving pixel circuits while simultaneously reducing load capacitance effects. The segmented wire configuration maintains simplicity through standardized voltage level assignment while achieving precise signal writing accuracy
Data Source
AI summary
A display device includes: a plurality of pixel circuits; a first gate signal wire arranged for every two rows of the pixel circuits; a second gate signal wire arranged for every row of the pixel circuits, a source signal wire arranged for every column of the pixel circuits; a switch arranged at each intersection of the second gate signal wire and the source signal wire; and a secondary source signal wire arranged to correspond to each of the switches, each of the pixel circuits including a switch and a storage capacitance, the switch switching between conduction and non-conduction between the source signal wire and the secondary source signal wire in accordance with the voltage of the second gate signal wire, and the switch switching between conduction and non-conduction between the secondary source signal wire and the storage capacitance in accordance with the voltage of the first gate signal wire.