Display Pixel Circuit Using AC Driving to Cut Gate Lines
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Solution Overview
Problem
Head-mounted displays (HMDs) require high-resolution displays, but existing technologies often necessitate a large number of gate lines, which can complicate the design and increase complexity.
Innovation Solution
A display device with a novel transistor configuration that reduces the number of gate lines by using alternating current driving voltage signals to control transistor turn-on and turn-off, separating threshold voltage detection and data write periods, and incorporating specific capacitors and transistors to enhance high-speed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of gate lines are used to achieve high-resolution display, then the resolution is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into a single gate line by implementing alternating current driving. The same gate line is used for both threshold voltage detection and data writing operations at different time periods, eliminating the need for separate gate lines for each function and reducing overall gate line count while maintaining high-resolution display capability
Solution Approach 2:
The patent employs periodic action by dividing the driving cycle into distinct periods: a first period for threshold voltage detection and a second period for data writing. The gate line alternates between these functions in a periodic manner, allowing the same hardware resource to serve multiple purposes over time, thereby reducing the total number of gate lines required
2Device complexity
If the number of gate lines is reduced, then the device complexity is decreased, but the high-speed operation capability may be affected
Solution Approach 1:
The patent maintains high-speed operation despite reduced gate lines by using periodic action to separate threshold voltage detection and data writing into different time periods. This temporal separation prevents signal interference and allows each operation to complete efficiently, maintaining driving speed while reducing hardware complexity
Solution Approach 2:
The patent applies preliminary action by completing threshold voltage detection in a first period before data writing begins in a second period. This preparatory step ensures that transistor parameters are known before data is written, enabling faster and more accurate data writing operations without requiring additional gate lines
Data Source
AI summary
A display device includes: a light emitting element; a driving voltage line transmitting a driving voltage signal having an active level or a non-active level in a preset period; a data line to which a data signal is applied; a first transistor connected between the driving voltage line and the light emitting element; and a second transistor connected to the driving voltage line and the data line, where a gate electrode of the second transistor is connected to the driving voltage line, and a source electrode of the second transistor is connected to the data line.