Gamma Voltage Correction Circuit for Stable Pixel Luminance
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Solution Overview
Problem
Display devices face reduced display quality due to fluctuations in power voltage, which affect the driving current and luminance of pixels, as existing technologies fail to effectively compensate for changes in power voltage.
Innovation Solution
A gamma voltage generation circuit that generates corrected reference voltages based on external power voltage fluctuations, using a combination of reference voltage generators, correctors, and amplifiers to produce stable gamma voltages, thereby maintaining desired luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power voltage is used to drive pixels, then pixel operation is enabled, but power voltage fluctuations cause changes in driving current and luminance
Solution Approach 1:
The patent implements a feedback mechanism where the actual power voltage is measured and used to adjust the gamma voltages. The gamma voltage generator receives the measured power voltage as input and dynamically corrects the gamma voltages to compensate for power voltage fluctuations, ensuring stable pixel luminance despite variations in the power supply.
Solution Approach 2:
The patent changes the parameters of gamma voltages based on the measured power voltage. By adjusting the gamma voltages as compensation values according to the actual power voltage level, the system maintains consistent display characteristics even when power voltage varies, effectively addressing the stability issue.
2Reliability
If gamma voltages are generated without power voltage compensation, then circuit complexity is reduced, but display quality deteriorates due to power voltage changes
Solution Approach 1:
The patent introduces an intermediary measurement and correction mechanism between the power voltage source and the gamma voltage generation. A voltage measurement unit measures the power voltage, and this measured value serves as an intermediary parameter that guides the correction of gamma voltages, enabling compensation without requiring complete system redesign.
Solution Approach 2:
The patent performs preliminary measurement of the power voltage before generating corrected gamma voltages. By measuring the actual power voltage in advance and using it to pre-correct the gamma voltages, the system proactively compensates for power variations rather than reacting to display quality issues after they occur.
Data Source
AI summary
A display device includes a display unit including a pixel which displays an image based on a first power voltage and a data signal, a gamma voltage generator which generates gamma voltages, and a data driver which generates the signal using the gamma voltages and provides the data signal to the pixel. The gamma voltage generator generates first and second reference voltages, generates first and second corrected reference voltages by correcting the first and second reference voltages using a target voltage and an external power voltage provided from the display unit in correspondence with the first power voltage, and generates the gamma voltages by dividing the first and second corrected reference voltages. The gamma voltage generator sets the target voltage based on at least one selected from the first reference voltage, the second reference voltage, and a ground voltage.