Gamma Voltage Control Circuit for Panel Power Noise Tracking
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Solution Overview
Problem
Display panels experience undesired luminance due to noise in panel power voltage, exacerbated by high resolution, high luminance, high frame rate, and material changes, which affect the difference between first and second reference voltages.
Innovation Solution
A gamma voltage control circuit that includes amplifiers and resistor strings to quickly reflect changes in panel power voltage as first and second reference voltages, using low dropout regulators and differential amplifiers to maintain voltage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high resolution, high luminance, and high frame rate are implemented in the display panel, then display quality is improved, but noise in the panel power voltage increases causing undesired luminance
Solution Approach 1:
The patent implements a feedback mechanism where the first reference voltage is generated based on the panel power voltage through a first amplifier, and this first reference voltage is then used to generate the second reference voltage through a second amplifier. This feedback loop ensures that when noise occurs in the panel power voltage, the reference voltages are quickly adjusted to follow the changes, maintaining stable luminance despite the increased noise from high-resolution, high-luminance, and high-frame-rate operations.
2Adaptability or versatility
If the panel power voltage changes, then the display can adapt to different operating conditions, but undesired luminance occurs due to difference between reference voltages and panel power voltage
Solution Approach 1:
The patent applies preliminary action by generating the first reference voltage in advance based on the panel power voltage using the first amplifier before the second reference voltage is generated. This preliminary generation of reference voltages ensures that when the panel power voltage changes, the reference voltages are already prepared to follow these changes, preventing luminance instability caused by voltage differences.
3Reliability
If noise in panel power voltage increases, then sensitivity of display panel to noise deteriorates, but display quality can be enhanced by quickly reflecting power voltage changes in reference voltages
Solution Approach 1:
The dual-amplifier feedback system continuously monitors the panel power voltage and adjusts both reference voltages to follow its changes, providing robust noise rejection that enhances display quality while maintaining reliability even as noise sensitivity deteriorates due to increased operating demands.
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
Prevents undesired luminance by ensuring the reference voltages closely follow panel power voltage changes, enhancing display quality by maintaining consistent luminance levels.
Implementation Method 1
a first amplifier configured to generate a first primitive reference voltage based on a panel power voltage applied to a display panel
Implementation Method 2
a second amplifier configured to generate a first reference voltage based on the first primitive reference voltage, the panel power voltage and an internal power voltage
Data Source
AI summary
A gamma voltage control circuit includes a first amplifier and a second amplifier. The first amplifier is configured to generate a first primitive reference voltage based on a panel power voltage applied to a display panel. The second amplifier is configured to generate a first reference voltage based on the first primitive reference voltage, the panel power voltage and an internal power voltage.