Pixel Driving Circuit Time-Division Light Emission IR-Drop Reduction
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Solution Overview
Problem
Existing display panels using driver circuits combining pulse amplitude modulation (PAM) and pulse width modulation (PWM) suffer from voltage drops (IR-drop) on the power supply voltage line, leading to poor display uniformity, especially as resolution increases.
Innovation Solution
The implementation of a pixel driving circuit with a pulse width modulation module and data signal terminals, where multiple sweep signal lines and data signal lines are arranged to provide sweep signals in a time division manner, reducing simultaneous light emission and thereby minimizing voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If driver circuits combining PAM and PWM are used to control light emission, then display quality and resolution are improved, but voltage drops on power supply voltage line increase causing poor display uniformity
Solution Approach 1:
The patent implements time-division light emission where light-emitting elements are divided into multiple groups that emit light sequentially at different time periods rather than simultaneously. This periodic action reduces the instantaneous current demand on power supply voltage lines, thereby minimizing voltage drops and improving display uniformity while maintaining high display quality through PWM control.
2Illumination intensity
If multiple light-emitting elements emit light simultaneously, then brightness and display coverage are improved, but voltage drops on power supply voltage line increase
Solution Approach 1:
The patent segments the light-emitting elements into multiple groups (first group and second group) that operate at different time periods. This segmentation allows the display to maintain overall brightness through sequential emission while reducing the instantaneous power consumption and voltage drops on the power supply voltage line by limiting the number of simultaneously active elements.
Data Source
AI summary
Provided are a pixel driving circuit, a display panel and a driving method thereof and a display device. The display panel includes multiple light-emitting elements and multiple pixel driving circuits. A pixel driving circuit includes a pulse width modulation module and a data signal terminal, the pulse width modulation module includes a sweep signal terminal and is configured to control light emission duration of a light-emitting element. The display panel further includes multiple sweep signal lines and multiple data signal lines. The multiple sweep signal lines extend along a first direction and are arranged along a second direction, and a sweep signal line is electrically connected to the multiple sweep signal terminals. The multiple data signal lines extend along the second direction and are arranged along the first direction, and a data signal line is electrically connected to the multiple data signal terminals.