Pixel Driving Circuit With Fifth Transistor for Threshold Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The limited duration of the threshold compensation phase in display panels results in a poor threshold compensation effect for drive transistors, affecting the performance of pixel driving circuits.
Innovation Solution
A display panel design incorporating a pixel driving circuit with a drive transistor, capacitors, and additional transistors, where the fifth transistor allows for arbitrary duration of the threshold compensation phase without altering the data writing duration, ensuring improved threshold compensation while maintaining unchanged refresh frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the threshold compensation phase duration is extended to improve compensation effect, then the threshold compensation effect is improved, but the data writing duration is reduced
Solution Approach 1:
The pixel driving circuit is divided into multiple functional modules: a drive transistor for driving, a first capacitor for threshold compensation, a second capacitor for voltage storage, and control transistors. This segmentation allows the threshold compensation function to be performed in parallel with data writing operations, resolving the time conflict between compensation and data writing.
Solution Approach 2:
The first capacitor performs threshold compensation in advance during the initialization phase before the data writing phase begins. By completing the compensation action preliminarily, the circuit avoids the need to extend the compensation phase into the data writing period, thus maintaining full data writing duration while achieving effective threshold compensation.
2Reliability
If conventional capacitor configuration is used, then the circuit structure is simple, but the threshold compensation effect is poor due to limited compensation phase duration
Solution Approach 1:
The first capacitor serves dual functions: it performs threshold compensation for the drive transistor and simultaneously stores voltage during the data writing phase. This merging of compensation and storage functions into a single capacitor reduces the need for additional components while improving compensation effectiveness.
Solution Approach 2:
The second capacitor acts as an intermediary element that couples the first capacitor to the power supply terminal. It mediates the voltage transfer and enables the first capacitor to maintain stable voltage during compensation, improving compensation effect without requiring direct complex circuitry between the capacitor and power supply.
Data Source
AI summary
A display panel and a display device. The display panel includes a pixel driving circuit, and the pixel driving circuit includes a drive transistor, a first capacitor, a second capacitor, a first transistor, a fifth transistor. A first electrode of the drive transistor is connected to a first power line. A first electrode of the first capacitor is connected to a gate of the drive transistor. A first electrode of the second capacitor is connected to a second electrode of the first capacitor. A first electrode of the first transistor is connected to a data line, and a second electrode is connected to a second electrode of the second capacitor. A first electrode of the fifth transistor is connected to the second electrode of the first capacitor and a second electrode is connected to a stabilized power supply terminal.