Pixel Circuit Layout for Non-Overlapping Scan Signal Charging
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Solution Overview
Problem
Existing display technologies using light-emitting diodes (LEDs) face challenges in increasing charging rates without expanding the non-display area, particularly due to signal interference and the need for overlapping gate signal pulses, which results in larger bezel areas.
Innovation Solution
A pixel circuit design that includes specific switch transistors and capacitors, allowing for non-overlapping gate signal pulses, thereby extending voltage charging time and improving charging efficiency without increasing the non-display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pulse width and phase of the gate signal are increased to overlap the pulses of the sequentially shifted gate signal, then the charging rate of the data voltage applied to the pixels is increased, but the number of clocks input to the gate driving circuit increases and the non-display area (bezel area) becomes larger
Solution Approach 1:
The pixel circuit is divided into multiple sub-pixels, with each sub-pixel having its own driving transistor and light-emitting element. This segmentation allows different scan signals to be applied to different sub-pixel groups, enabling non-overlapping gate signals while maintaining high charging rates through the dual-switch transistor configuration in each sub-pixel
Solution Approach 2:
The patent employs dynamic control of switch transistors (first-first and first-second switch transistors) that are turned on and off at different times based on different scan signals. This dynamic switching allows the circuit to charge the data voltage during extended periods without requiring overlapping gate pulses, thereby improving charging rate while avoiding increased bezel area
2Productivity
If the pulse width and phase of the gate signal are increased to overlap the pulses, then the charging rate of the data voltage is increased, but the number of clocks input to the gate driving circuit increases
Solution Approach 1:
The patent uses periodic, non-overlapping scan signals (first scan signal and second scan signal) that are applied alternately to different sub-pixel groups. This periodic action with extended duty cycles allows sufficient charging time for the data voltage without requiring multiple overlapping pulses, thereby reducing the number of clock inputs needed for the gate driving circuit while maintaining high charging rates
3Area of stationary object
If non-overlapping gate signal pulses are used to reduce the non-display area, then the number of clocks is reduced, but the voltage charging time of the pixel circuit must be longer than the pulse width of each scan signal
Solution Approach 1:
The patent ensures continuous charging of the data voltage by using multiple switch transistors that are controlled by different scan signals with extended pulse widths. The first-first and first-second switch transistors are turned on at different times, creating a continuous charging path that extends beyond the pulse width of individual scan signals. This continuous useful action allows non-overlapping gate pulses to achieve sufficient charging without losing time
Data Source
AI summary
The present disclosure relates to a pixel circuit and a display device including the same, including a light-emitting element; a driving transistor connected to the light-emitting element; a first-first switch transistor connected between a gate electrode of the driving transistor and a data line to which a data voltage is applied and turned on in response to a pulse of a second scan signal; and a first-second switch transistor connected between the gate electrode of the driving transistor and the data line and turned on in response to a pulse of a first scan signal input prior to the pulse of the second scan signal.