Display Substrate Compensation Structure for Leakage Reduction
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Solution Overview
Problem
Low-temperature polycrystalline silicon transistors in organic light-emitting diode displays suffer from significant electric leakage at lower frequencies, leading to poor display effects due to high Ioff values, which affects the gate electrode voltage retention and causes flicker issues.
Innovation Solution
A display substrate with a compensation structure coupled to a compensation signal line, positioned near the driving channel portion of the driving transistor, adjusts the electric field and capacitance to reduce leakage by compensating the gate electrode voltage through adjustable compensation signals, improving voltage retention and display quality at low frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low-temperature polycrystalline silicon transistors are used in organic light-emitting diode displays, then the display can achieve high contrast, low power consumption, and light weight, but the transistors suffer from significant electric leakage at lower frequencies due to high Ioff values
Solution Approach 1:
A compensation structure is introduced as an intermediary element between the driving transistor and the gate electrode. This compensation structure receives compensation signals and generates compensating voltages that counteract the electric leakage effects, thereby mediating the harmful Ioff values without requiring changes to the fundamental transistor design
Solution Approach 2:
The patent changes the electrical parameters of the gate electrode by applying compensation signals through the compensation structure. This dynamically adjusts the gate voltage to compensate for leakage-induced voltage drops, effectively changing the operating parameters to maintain display quality at low frequencies
2Use of energy by stationary object
If the driving frequency is reduced for low-frequency display, then power consumption decreases, but the high Ioff values cause poor voltage retention and flicker issues
Solution Approach 1:
The compensation structure performs preliminary action by proactively applying compensation signals before the voltage degradation becomes problematic. This preventive approach counteracts leakage effects in advance, maintaining stable gate voltage retention throughout the display frame period at low frequencies
Solution Approach 2:
The compensation structure implements a feedback mechanism where compensation signals are applied based on the expected leakage behavior. This feedback loop continuously corrects the gate voltage to compensate for Ioff-induced degradation, ensuring stable voltage retention during low-frequency operation
Data Source
AI summary
The present disclosure provides a display substrate and a display device. The display substrate includes: a base substrate, and a compensation signal line and a plurality of sub-pixels on the base substrate. The sub-pixel includes a sub-pixel driving circuit. The sub-pixel driving circuit includes a driving transistor and a compensation structure. The compensation structure is coupled to the corresponding compensation signal line. An orthographic projection of the compensation structure onto the base substrate is located at a side of an orthographic projection of a gate electrode of the driving transistor onto the base substrate.