AMOLED Driving Circuit Pulse Width Modulation for Threshold Voltage Stability
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Solution Overview
Problem
Conventional AMOLED driving circuits affect the threshold voltage of thin-film transistors, leading to non-uniformity and deterioration in displaying quality due to long-term electron influence, which compromises the electrical current and overall performance of AMOLED panels.
Innovation Solution
The AMOLED panel driving circuit employs a pulse width modulation method, dividing data frames into eight sub-frames with equal time intervals, using a timing controller and gamma IC to control gate and source drivers, ensuring proper charging and discharging of storage capacitors without altering the threshold voltage, thus enhancing uniformity and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional AMOLED driving circuit with two thin-film transistors and a storage capacitor is used, then the structure remains simple, but the threshold voltage of the second thin-film transistor is affected due to long-term electron influence, leading to non-uniformity and deterioration in displaying quality
Solution Approach 1:
The patent divides the data frame into eight sub-frames with equal time intervals and applies pulse width modulation to charge the storage capacitor. This segmentation approach reduces the charging time for each sub-frame, preventing long-term electron influence on the second thin-film transistor and maintaining threshold voltage stability, thereby improving display uniformity while keeping the circuit structure simple
Solution Approach 2:
The patent implements periodic charging of the storage capacitor through eight sub-frames within each data frame. This periodic action with constant time intervals ensures that the second thin-film transistor is not continuously exposed to electron influence, maintaining stable threshold voltage and improving display quality without increasing circuit complexity
2Duration of action of stationary object
If the second thin-film transistor is continuously affected by electrons, then the driving circuit can maintain continuous operation, but the threshold voltage changes, affecting electrical current and display quality
Solution Approach 1:
The patent uses periodic charging through eight sub-frames to maintain continuous operation while preventing threshold voltage drift. The storage capacitor is charged in periodic intervals rather than continuously, reducing cumulative electron influence on the second thin-film transistor and maintaining threshold voltage stability throughout operation
Solution Approach 2:
The patent maintains continuous display operation through the eight-sub-frame structure, where the storage capacitor is periodically recharged to maintain the voltage level. This ensures continuous useful action (display output) while preventing the harmful continuous exposure to electrons that would degrade threshold voltage stability
Data Source
AI summary
The present invention provides an AMOLED panel driving circuit and driving method. The driving circuit includes: an AMOLED panel (2), a gate driver (4) and a source driver (6) each electrically connected to the AMOLED panel (2), and a timing controller (8) and a gamma IC (10) each electrically connected to the source driver (6). The timing controller (8) is further electrically connected to the gate driver (4) and the gamma IC (10). The timing controller (8) uses two sets of gate control signal to control the gate driver (4). The source driver (6) supplies a data signal to the AMOLED panel (2). The data signal includes a plurality of data frames and each of the data frames includes a plurality of sub-data-frames having equal time intervals.