Pixel Circuit Pulse Width Compensation for OLED Driving
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Solution Overview
Problem
Existing pixel circuits in active organic light emitting diode displays face challenges with insufficient driving capability, which affects the performance and efficiency of these displays.
Innovation Solution
A pixel circuit with pulse width compensation, incorporating a pulse width modulation circuit and a pulse amplitude modulation circuit, utilizing P-type transistors and capacitors to optimize the driving of light-emitting elements, ensuring stable current and minimal power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional pixel circuits are used in active organic LED displays, then the display can be implemented, but the driving capability is insufficient
Solution Approach 1:
The pixel circuit is divided into two independent modulation circuits: pulse width modulation (PWM) circuit and pulse amplitude modulation (PAM) circuit. Each circuit handles a specific aspect of light emission control, with PWM managing duration and PAM managing intensity, thereby enhancing overall driving capability while maintaining specialized function optimization
Solution Approach 2:
The circuit employs dynamic control through multiple transistors (first P-type control transistor, second P-type control transistor, P-type driving transistor) that can switch states based on input signals. This dynamic switching enables flexible adjustment of pulse width and amplitude, significantly improving driving capability and display performance
2Power
If the pixel circuit uses P-type transistors for pulse width and amplitude modulation, then driving capability is enhanced, but circuit complexity increases
Solution Approach 1:
Multiple transistors in the circuit serve dual purposes: they function as switches for signal control and simultaneously act as current mirrors for signal amplification and distribution. This multi-functionality reduces the need for additional dedicated components, thereby enhancing driving capability while limiting the increase in circuit complexity
Solution Approach 2:
The PWM and PAM circuits are merged into a single integrated pixel circuit structure, sharing common components such as the P-type driving transistor and light-emitting element. This integration allows both modulation functions to work together efficiently, improving driving capability without proportionally increasing overall circuit complexity
3Stability of the object's composition
If pulse width and amplitude modulation are implemented, then current stability is improved, but power consumption increases
Solution Approach 1:
The circuit employs periodic pulse signals with controlled widths and amplitudes to drive the light-emitting element. By using periodic modulation instead of continuous driving, the circuit achieves stable current control while reducing average power consumption, as the light-emitting element is active only during the pulse periods
Solution Approach 2:
The circuit dynamically adjusts pulse width and amplitude parameters based on display requirements. By changing these parameters, the circuit can maintain optimal current stability for light emission while adapting power consumption levels to match the actual display needs, avoiding unnecessary energy usage
Data Source
AI summary
The present disclosure provides a pixel circuit with pulse width compensation, and the pixel circuit includes a pulse width modulation circuit and a pulse amplitude modulation circuit, and the pulse amplitude modulation circuit is electrically connected to the pulse width modulation circuit. The pulse width modulation circuit includes a P-type pulse width compensation transistor and a first P-type control transistor, and the first P-type control transistor is electrically connected to the P-type pulse width compensation transistor. The pulse amplitude modulation circuit includes a second P-type control transistor, a first capacitor, a P-type driving transistor and a light-emitting element. The second P-type control transistor is electrically connected to the first P-type control transistor. The first capacitor is electrically connected to the second P-type control transistor. The P-type driving transistor is electrically connected to the first capacitor, and the light-emitting element is electrically connected to the P-type driving transistor.