Pixel Circuit With Two Shared AC Lines for Voltage Compensation
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Solution Overview
Problem
Conventional pixel circuits require multiple alternating current signal lines for voltage compensation, leading to increased layout area and decreased brightness due to reduced aperture ratio.
Innovation Solution
A pixel circuit design utilizing only two alternating current signal lines, incorporating a light emitting element, transistors, a capacitor, and various control circuits, allowing for voltage compensation without increasing circuit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple alternating current signal lines are provided for voltage compensation, then voltage compensation function is improved, but layout area increases and aperture ratio decreases
Solution Approach 1:
The patent combines multiple signal lines into two shared alternating current signal lines that serve multiple pixels sequentially. The time-division multiplexing approach allows the same physical lines to carry compensation signals for different pixels at different times, reducing the total number of lines needed while maintaining voltage compensation functionality.
Solution Approach 2:
The patent transitions from spatial allocation of dedicated signal lines to temporal allocation through scanning. By introducing the scan signal dimension, the system multiplexes signal lines in time rather than requiring separate physical lines for each pixel, effectively adding a temporal dimension to the signal transmission.
2Reliability
If multiple alternating current signal lines are provided for voltage compensation, then voltage compensation function is improved, but aperture ratio decreases and brightness decreases
Solution Approach 1:
By merging multiple signal lines into two shared lines with time-division multiplexing, the patent reduces the total wire area occupying the pixel region. This frees up more area for light emission, directly improving aperture ratio and brightness while preserving voltage compensation through temporal multiplexing.
3Area of stationary object
If two alternating current signal lines are used, then circuit area is reduced and aperture ratio is increased, but voltage compensation capability must be maintained
Solution Approach 1:
The patent implements periodic scanning of signal lines in a sequential manner. The scan signal activates different signal lines in periodic cycles, allowing the two shared alternating current signal lines to serve multiple pixels sequentially. This periodic time-division multiplexing maintains voltage compensation capability while using fewer physical lines.
Solution Approach 2:
The two alternating current signal lines are designed with multi-functionality, serving multiple pixels across different time periods. Each signal line can provide voltage compensation for multiple pixels sequentially, making them universal components that replace what would traditionally require multiple dedicated lines.
Data Source
AI summary
A pixel circuit includes a light emitting element, a first transistor, a capacitor, a driving circuit, a light emitting control circuit, a reset circuit, a voltage dividing circuit, and a data input circuit. The light emitting element receives a supply voltage. The first transistor receives an operating high voltage and a scan signal, and is coupled to the light emitting element. The driving circuit provides a driving current based on a driving voltage. The light emitting control circuit is coupled between the driving circuit and a ground voltage, and receives a light emitting signal. The reset circuit is coupled between a reference voltage and the driving voltage, and receives the scan signal. The voltage dividing circuit is coupled between the driving voltage and the capacitor, and receives the light emitting signal. The data input circuit is coupled between the capacitor and a data input signal, and receives the scan signal.