Display Control Circuit Gamma Voltage Adjustment
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Solution Overview
Problem
Current panel display devices face issues with unequal charged voltages at the near and far ends of the chip-on-film (COF), leading to display differences and affecting the display effect, as existing methods struggle to adjust gamma voltages effectively within one frame time.
Innovation Solution
A display control circuit comprising a current source, capacitor, discharge circuit, and initial reference voltage generating module, which generates an adjusted reference voltage for different regions of the display panel by approximating the change curve of the charging voltage, allowing for gamma voltage adjustments between the near and far ends within the same frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a constant reference voltage Vref is used for gamma voltage generation across all areas, then the circuit design is simple, but the charged voltages become unequal at the near-COF side and far-COF side, causing display non-uniformity
Solution Approach 1:
The patent applies local quality by generating different reference voltages for different spatial regions of the display panel. Specifically, it divides the display area into multiple regions (e.g., near-COF side and far-COF side) and provides each region with a tailored reference voltage that compensates for the RC delay characteristics of that specific area, thereby achieving uniform display performance across the entire panel.
Solution Approach 2:
The patent changes the reference voltage parameter dynamically based on spatial position and time. By adjusting the reference voltage magnitude according to the RC delay characteristics of different regions, it compensates for the voltage inequality without requiring complete redesign of the gamma voltage generation architecture.
2Manufacturing precision
If the gamma code method is used to adjust gamma voltage, then display uniformity can be improved, but it cannot be achieved within one frame time
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing the compensation values for different regions before the display frame is rendered. The reference voltage adjustment is prepared in advance based on the known RC delay characteristics of various display areas, allowing the compensation to be applied immediately when needed without requiring time-consuming real-time calculations during the frame execution.
Solution Approach 2:
The patent introduces dynamic reference voltage adjustment that can adapt to different spatial regions and temporal requirements. By making the reference voltage a dynamic parameter rather than a static value, the system can respond to the specific needs of each display region within the constraints of the frame time, enabling both uniformity and timing requirements to be satisfied.
3Area of stationary object
If the display panel size is increased, then consumer needs are met, but the RC delay increases causing greater voltage inequality and display differences
Solution Approach 1:
The patent applies segmentation by dividing the large display panel into multiple zones or regions based on their RC delay characteristics. Each segmented region receives a customized reference voltage tailored to its specific electrical characteristics, allowing the overall large panel to maintain display uniformity despite the increased size and associated RC delay variations across different areas.
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 solution enables uniform gamma voltage adjustments across the display panel, improving display quality by ensuring consistent brightness from the far end to the near end without additional risks, thereby addressing the issue of unequal voltages and display differences.
Implementation Method 1
a current source, a first capacitor, a discharge circuit, a subtractor, and an initial reference voltage generating module; the current source being coupled to a first end of the first capacitor to generate a charging voltage changing with time
Data Source
AI summary
The invention provides a display control circuit, method and panel display device. The display control circuit includes: a current source, a first capacitor, a discharge circuit, a subtractor, and an initial reference voltage generating module; the current source coupled to first end of the first capacitor to generate a charging voltage changing with time, and second end of the first capacitor grounded; the discharge circuit connected to first end of the first capacitor to clear the charging voltage at beginning of each frame; a negative input end of the subtractor inputting the charging voltage, a positive input end of the subtractor connected to output end of the initial reference voltage generating module, and the subtractor outputting an adjusted reference voltage required for different regions of display panel; the initial reference voltage generating module outputting a fixed initial reference voltage; the adjusted reference voltage used for generating a gamma voltage.