LCD Pixel Driving Circuit Voltage Reset
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Solution Overview
Problem
The existing liquid crystal display panels suffer from a magnetic hysteresis effect, causing unstable image display due to different tilt angles for the same voltage difference, which is currently mitigated by increasing display frequency and complexity through the use of black frames, requiring significant computing power and design complexity.
Innovation Solution
A driving circuit with a second scan circuit and scan line is introduced, allowing for the resetting of the voltage difference between the driving capacitor's ends to zero within a single frame period by alternating the states of transistors and scan circuits during specific time slots, eliminating the need for increased display frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If black frames are inserted between frames to reset voltage difference and prevent magnetic hysteresis, then image stability is improved, but display frequency must be doubled which increases processor load and system complexity
Solution Approach 1:
The frame period is segmented into two distinct time slots: a first time slot for normal image display and a second time slot for resetting the voltage difference to zero. This segmentation allows the reset operation to occur within the same frame period without requiring doubled display frequency, thereby maintaining image stability while avoiding increased system complexity
Solution Approach 2:
The voltage difference reset is performed periodically at specific time slots within each frame period. By establishing a periodic reset cycle that occurs during the second time slot, the magnetic hysteresis effect is prevented through regular voltage normalization without requiring external black frame insertion or frequency doubling
2Reliability
If black frames are inserted between frames to reset voltage difference, then magnetic hysteresis effect is prevented, but computing power consumption increases due to doubled display frequency
Solution Approach 1:
The frame period is divided into operational time slots, with the second time slot dedicated to voltage difference reset. This segmentation enables magnetic hysteresis prevention through internal circuit operation during the second time slot, eliminating the need for processor-intensive black frame insertion and frequency doubling while maintaining effective hysteresis control
Solution Approach 2:
The driving circuit performs self-reset of the voltage difference during the second time slot without requiring external processor intervention. The circuit autonomously normalizes the voltage difference to zero through its internal capacitor network, preventing magnetic hysteresis while minimizing processor power consumption by eliminating the need for frequency-doubling control operations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables stable image display without doubling the display frequency, reducing processor load and design complexity, as the voltage difference is reset within a single frame, preventing magnetic hysteresis effectively.
Implementation Method 1
a first voltage stabilizing capacitor, a second voltage stabilizing capacitor, The first voltage stabilizing capacitor is electrically connected to a first end of the driving capacitor and the reference voltage source. The second voltage stabilizing capacitor is electrically connected to a second end of the driving capacitor and the reference voltage source.
Implementation Method 2
The liquid crystals have different tilt angles for the same voltage difference (or the pixel displays different brightnesses for the same gray level signal) due to the magnetic hysteresis effect
Data Source
AI summary
A driving circuit of a pixel includes a driving capacitor for driving liquid crystals according to a voltage difference between first and second ends of the driving capacitor, a reference voltage source for providing a reference voltage, a first data line for providing a first driving voltage, a second data line for providing a second driving voltage, a first scan circuit for electrically connecting the first and the second data lines to the first and the second ends of the driving capacitor respectively when the first scan circuit is turned on, a first scan line for controlling on and off states of the first scan circuit, a second scan circuit for electrically connecting the first end and the second end of the driving capacitor when the second scan circuit is turned on, and a second scan line for controlling on and off states of the second scan circuit.