Pixel Driving Circuit With Reference Voltage for Display Uniformity
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Solution Overview
Problem
In display panels, the uneven voltage drops across power supply lines result in inconsistent display effects due to variations in driving current, affecting the uniformity of light emission.
Innovation Solution
A pixel driving circuit is designed with a control circuit, voltage stabilization circuit, and storage circuits to regulate and stabilize the driving current, utilizing transistors and capacitors to manage signal flow and charge storage, ensuring consistent light emission across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel driving circuit is used, then the structure is simple, but the voltage drops across power supply lines cause uneven driving current and inconsistent display effects
Solution Approach 1:
The patent introduces a reference voltage terminal as an intermediary element that provides a stable reference potential to the pixel circuit. This reference voltage acts as a mediator between the power supply lines and the driving transistor, compensating for voltage drops by establishing a consistent reference point for threshold voltage compensation, thereby ensuring uniform display across the panel without requiring complex external control circuits
Solution Approach 2:
The patent implements preliminary threshold voltage compensation by storing compensation voltages in capacitors before the light emission phase. The circuit performs threshold voltage measurement and compensation in advance during the programming phase, so that when the pixel operates during light emission, the driving transistor already has compensated threshold voltage stored in the capacitor, eliminating the need for real-time adjustment and ensuring consistent display uniformity
Data Source
AI summary
A display panel is disclosed. The display panel includes a base substrate; and an active layer arranged on a side of the base substrate. The active layer includes: a sixth active portion, a seventh active portion, a tenth active portion and a second initialization signal line, the second initialization signal line is connected to an end of the seventh active portion away from the sixth active portion, the second initialization signal line is used for providing an initialization signal to a seventh transistor, the seventh transistor comprises the seventh active portion, and the second initialization signal line extends along a first direction.