LTPO Pixel Driving Circuit Frequency Switching Compensation
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Solution Overview
Problem
Low Temperature Polycrystalline Oxide (LTPO) display products experience changes in brightness and color when the display frequency is switched from high to low, due to inconsistencies in the electric properties of the driving transistor, leading to suboptimal performance in low-frequency applications.
Innovation Solution
A pixel driving circuit with a data writing module and driving transistor, utilizing a writing frame with multiple phases to write compensation and active data voltages, and an initialization module to reset the gate potential, ensuring consistent transistor operation across frequency changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the display frequency is switched from high to low, then power consumption is reduced, but brightness and color consistency deteriorates
Solution Approach 1:
The patent applies preliminary action by introducing a compensation voltage writing phase that occurs before the main data voltage writing phase. This preliminary compensation step adjusts the transistor's electric properties in advance to counteract the effects of frequency switching, ensuring that when the main data is written, the transistor is already in the correct state to maintain brightness and color consistency at low frequencies.
Solution Approach 2:
The patent changes the electrical parameters of the driving transistor by writing a compensation voltage (first data compensation voltage) into the gate, first electrode, and second electrode before writing the active data voltage. This parameter adjustment compensates for the changes in transistor electric properties that occur during frequency switching, thereby maintaining display quality while enabling low-frequency operation.
2Stability of the object's composition
If multiple data writing phases are introduced to compensate for frequency changes, then brightness and color consistency is improved, but device complexity increases
Solution Approach 1:
The patent merges the compensation voltage writing and active data voltage writing operations into a single data writing module that handles both functions sequentially. Instead of adding separate compensation circuits, the module integrates both the first data compensation voltage and active data voltage writing operations, reducing overall device complexity while maintaining brightness and color consistency.
Solution Approach 2:
The patent segments the data writing process into distinct phases: a first data writing phase for writing the compensation voltage, and a second data writing phase for writing the active data voltage. This segmentation allows the complex compensation function to be broken down into manageable sequential steps within a single module, making the implementation more straightforward and less complex.
3Stability of the object's composition
If multiple data writing phases are introduced to compensate for frequency changes, then display stability is improved, but writing time increases
Solution Approach 1:
The patent implements periodic action by structuring the data writing process as repeated sequential phases (first data writing phase for compensation voltage, second data writing phase for active data voltage) that occur periodically during each frame. This periodic multi-phase approach ensures stable display by systematically compensating for frequency changes while distributing the writing operations over the frame period, minimizing impact on overall display timing.
Data Source
AI summary
The present application provides a pixel driving circuit and a display panel. The pixel driving circuit includes a driving transistor and a data writing module. a driving timing of the pixel driving circuit includes a writing frame including a first data writing phase and a second data writing phase in sequence, the data voltage includes an active data voltage and a first data compensation voltage, the data writing module is configured to write the first data compensation voltage into the gate, the first electrode, and the second electrode of the driving transistor in the first data writing phase, and to write the active data voltage into the gate, the first electrode, and the second electrode of the driving transistor in the second data writing phase.