Gamma Voltage Generation Circuit for Power-Compensated Pixel Luminance
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Solution Overview
Problem
Display devices face reduced display quality due to fluctuations in power voltage, leading to changes in driving current and luminance emission by pixels, which existing technologies fail to effectively compensate for.
Innovation Solution
A gamma voltage generation circuit that generates corrected reference voltages based on external power voltage and target voltages, using resistor strings and decoders to produce gamma voltages that stabilize pixel luminance, thereby compensating for power voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If power voltage is used to drive pixels, then pixels can emit light at desired luminance, but power voltage fluctuations cause driving current changes and luminance instability
Solution Approach 1:
The patent changes the parameter of reference voltage by generating corrected reference voltages that compensate for power voltage fluctuations. The gamma voltage generator adjusts reference voltages based on detected power voltage changes, thereby maintaining stable pixel luminance despite power voltage instability.
Solution Approach 2:
The patent implements a feedback mechanism where the gamma voltage generator detects power voltage fluctuations and generates corrected reference voltages in response. This feedback loop ensures that luminance stability is maintained by continuously adjusting reference voltages based on actual power voltage conditions.
2Stability of the object's composition
If gamma voltage generation circuit is added to compensate for power voltage changes, then pixel luminance stability is improved, but device complexity increases
Solution Approach 1:
The gamma voltage generation circuit is designed to perform multiple functions: generating reference voltages, detecting power voltage fluctuations, generating corrected reference voltages, and dividing voltages to produce gamma voltages. This multi-functionality reduces the need for separate compensation circuits, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent merges the voltage division function and the reference voltage correction function into a single gamma voltage generation circuit. By combining these functions, the circuit achieves luminance compensation without requiring separate dedicated circuits for each function, thus controlling overall device complexity.
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.