Gradation Voltage Generator with Reference Gamma Selector
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Solution Overview
Problem
Display panel image quality degrades due to changes in driving voltage, as existing gradation voltage generators fail to compensate for variations in power supply voltage, leading to inconsistent gradation voltages and altered brightness across pixels.
Innovation Solution
A gradation voltage generator that adjusts gradation voltages based on changes in power supply voltage by using a reference gamma selector and gamma curve controller to generate and output a range of voltages, with a voltage compensation unit ensuring the minimum gamma voltage remains stable despite changes in the maximum reference voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the panel driving voltage changes, then the maximum reference voltage changes, but the gradation voltage consistency deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the actual panel driving voltage is monitored and used to adjust the maximum reference voltage. The voltage compensation unit receives feedback about voltage changes and dynamically compensates the minimum gamma voltage to maintain consistent gradation voltages, resolving the contradiction between adaptability to voltage changes and gradation voltage consistency.
Solution Approach 2:
The patent changes the parameter of minimum gamma voltage based on the detected panel driving voltage changes. By dynamically adjusting the minimum gamma voltage parameter in response to driving voltage variations, the system maintains consistent gradation voltages while adapting to different operating conditions, thus resolving the contradiction between adaptability and consistency.
2Adaptability or versatility
If the maximum reference voltage varies with panel driving voltage, then the system adapts to voltage changes, but the minimum gamma voltage becomes unstable
Solution Approach 1:
The voltage compensation unit acts as an intermediary between the maximum reference voltage and the minimum gamma voltage. It receives the maximum reference voltage and panel driving voltage information, processes this information, and generates a compensated minimum gamma voltage that maintains stability despite variations in the maximum reference voltage, thus resolving the contradiction between adaptability and reliability.
Solution Approach 2:
The system performs preliminary compensation by calculating the expected change in minimum gamma voltage based on panel driving voltage changes before the actual voltage variation affects the gradation output. The voltage compensation unit proactively adjusts the minimum gamma voltage to counteract anticipated instability, maintaining reliability while adapting to voltage changes.
3Device complexity
If no voltage compensation is applied, then the device complexity is low, but image quality degrades due to inconsistent gradation voltages
Solution Approach 1:
The patent segments the voltage generation system into distinct functional units: a maximum reference voltage generation unit, a voltage compensation unit, and a minimum gamma voltage generation unit. This segmentation allows the compensation function to be added as a separate module, increasing image quality consistency while minimizing the increase in overall device complexity through modular design.
Data Source
AI summary
A gradation voltage generator for applying a gradation voltage according to gamma characteristics of a display panel includes a reference gamma selector that receives a maximum reference voltage, a minimum reference voltage, and a first reference voltage, and selects and outputs a maximum gamma voltage and a minimum gamma voltage from among voltages between the maximum reference voltage and the minimum reference voltage, wherein when the maximum reference voltage changes, the minimum gamma voltage is compensated by a difference the changed maximum reference voltage and the first reference voltage and a gamma curve controller that receives the maximum gamma voltage and the minimum gamma voltage, and generates and outputs a plurality of gradation voltages.