Display Device Shared-Voltage Circuit for Crosstalk Reduction
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Solution Overview
Problem
Display devices face issues with crosstalk and require multiple voltage lines, which can be problematic for static electricity resistance.
Innovation Solution
The display device incorporates a specific transistor configuration and capacitor design to control the driving current and voltage supply, minimizing voltage lines and enhancing static electricity resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple voltage lines are used to supply different voltages to transistors, then the display device can achieve precise voltage control for each transistor, but the number of voltage lines increases leading to higher device complexity and reduced static electricity resistance
Solution Approach 1:
The patent combines multiple voltage supply functions into a single driving voltage line. Specifically, the same driving voltage is supplied to the gate electrode, drain electrode, and source electrode of the first transistor through shared voltage lines, eliminating the need for separate voltage lines for each electrode and reducing overall device complexity while maintaining proper voltage control
Solution Approach 2:
The driving voltage line serves multiple functions simultaneously by supplying voltage to different electrodes (gate, drain, source) of the first transistor at different operational stages. This multi-functional approach allows a single voltage line to replace what would traditionally require multiple dedicated voltage lines, reducing device complexity
2Ease of operation
If multiple separate voltage lines are used for gate electrode, drain electrode, and source electrode, then each electrode can be controlled independently, but the device complexity increases and static electricity resistance decreases
Solution Approach 1:
The patent implements dynamic voltage control where the first transistor operates in different modes (accumulation mode and depletion mode) by controlling the timing and presence of driving voltage on different electrodes. The gate electrode receives driving voltage during specific periods to control threshold voltage, while the drain and source electrodes receive driving voltage at different times to control current flow, achieving independent control through time-based dynamic management rather than separate physical lines
Solution Approach 2:
The patent uses periodic application of driving voltage to different electrodes based on operational phases. The gate electrode receives driving voltage during a first period to adjust threshold voltage, while the drain and source electrodes receive driving voltage during a second period for current control, enabling independent electrode control through periodic voltage application without requiring separate permanent voltage lines
3Ease of manufacture
If traditional transistor configuration is used, then the display device can operate with standard circuit design, but crosstalk occurs between adjacent pixels and static electricity resistance is reduced
Solution Approach 1:
The patent extracts and eliminates the source of crosstalk by using a transistor configuration where the first transistor's gate, drain, and source are controlled through shared voltage lines rather than separate lines that could couple adjacent pixels. This extraction of the problematic separate voltage line structure removes the crosstalk pathway while maintaining standard manufacturing compatibility
Solution Approach 2:
The shared driving voltage line acts as an intermediary that supplies voltage to multiple electrodes without creating direct coupling between adjacent pixel circuits. By using a common voltage line with controlled impedance and proper grounding, the patent prevents signal interference and crosstalk between pixels while still enabling proper transistor operation
Data Source
AI summary
A display device includes: a light emitting element on a substrate; a first transistor to control a driving current to flow through the light emitting element; a second transistor to supply a data voltage to a source electrode of the first transistor; a third transistor electrically connecting a gate electrode of the first transistor and a drain electrode of the first transistor to each other; a fourth transistor to supply a driving voltage to the gate electrode of the first transistor; and a fifth transistor to supply the driving voltage to the drain electrode of the first transistor.