AMOLED Display Panel Data-Signal Compensation for Low-Frequency Flicker
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
AMOLED display panels experience flickering issues in low-frequency mode, which can lead to vision damage due to unstable driving current and brightness discrepancies caused by leakage current in the transistors, particularly during the front and rear corridor periods.
Innovation Solution
The display panel design includes a pixel circuit structure with a driving transistor, first and second transistors, and a capacitor, where data signals transition from a first level to a second level during both the display area scanning and front and rear corridor periods, stabilizing the gate voltage of the driving transistor and minimizing brightness discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a low-frequency display mode is used to minimize power consumption, then battery life is extended, but flickering occurs and vision damage may result
Solution Approach 1:
The patent changes the voltage level parameter of the data signal during different time periods. Specifically, during the front and rear corridor periods, the data signal transitions to a second voltage level (different from the first level used during display scanning), which compensates for leakage current effects and stabilizes the driving transistor gate voltage, thereby eliminating flickering while maintaining low-frequency operation
Solution Approach 2:
The patent applies preliminary compensation action during the front and rear corridor periods before the actual display scanning begins. By adjusting the data signal voltage level in advance during these corridor periods, the gate voltage of the driving transistor is pre-stabilized, preventing flickering from occurring during the subsequent display period
2Reliability
If the data signal level is changed during front and rear corridor periods, then brightness discrepancies are minimized and flickering is reduced, but circuit complexity increases
Solution Approach 1:
The data signal line serves multiple functions: it transmits display data during the display scanning period and simultaneously acts as a compensation signal line during the front and rear corridor periods. This multi-functionality allows the same hardware infrastructure to perform both display and flicker compensation without adding separate dedicated compensation circuits
Solution Approach 2:
The display panel's existing data signal infrastructure is utilized to perform the compensation function. The data signal itself is modulated to carry compensation information during corridor periods, allowing the system to self-compensate for leakage current effects without requiring external compensation circuits or additional control hardware
Data Source
AI summary
Display panel and display device are provided. The display panel includes a base substrate; a plurality of pixel circuits, on a side of the base substrate; and light-emitting elements electrically connected to the plurality of pixel circuits. A pixel circuit of the plurality of pixel circuits includes a driving transistor; a first transistor, connected in series between the driving transistor and the data line, transmitting a data signal to the driving transistor in response to a first scanning signal; a second transistor, electrically connected between the driving transistor and a light-emitting element of the light-emitting elements, and transmitting a driving current to the light-emitting element of the light-emitting elements in response to a light-emitting control signal; a first capacitor; and the first node, on a side of the second plate of the first capacitor away from the base substrate.