Display Driver Circuit Resistor Segmentation for Voltage Uniformity
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Solution Overview
Problem
In display devices, the varying resistance of connection lines between the source driver and pixel array leads to nonuniform voltage charge distribution among liquid crystal units, resulting in defects in display image uniformity due to longer connection lines having higher resistance and thus lower charge quantity.
Innovation Solution
A control circuit that uses a combination of resistors with different resistances to balance the charge quantity across rows of pixels by activating specific resistors based on the length of connection lines, dividing the pixel array into areas with different resistor configurations to ensure even power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the connection line length is increased to cover more pixel rows, then the coverage area increases, but the line resistance increases causing nonuniform voltage charge distribution
Solution Approach 1:
The pixel array is divided into multiple areas (first area, second area, third area) based on connection line resistance characteristics. Each area is assigned a specific resistor value to compensate for the varying line resistance. This segmentation allows the driver to maintain uniform voltage charge distribution across the entire large-area pixel array by treating different regions differently.
Solution Approach 2:
Different resistor values are assigned to different areas of the pixel array based on their specific connection line resistance characteristics. The first area uses a first resistor value, the second area uses a second resistor value, and the third area uses a third resistor value. This local quality approach ensures that each area receives appropriate compensation for its specific line resistance, achieving uniform overall performance.
2Device complexity
If a single resistor value is used for all pixel rows, then the device complexity is reduced, but the charge quantity uniformity across different areas deteriorates
Solution Approach 1:
The driver dynamically selects and activates different resistor values based on which area is currently being driven. The control circuit determines the connection line resistance for the current area and activates the corresponding resistor value, allowing the system to adapt to different areas' requirements while maintaining relatively simple hardware architecture.
Solution Approach 2:
The resistor value parameter is changed based on the area being driven. The driver includes multiple resistors with different resistance values (first resistor, second resistor, third resistor) and selectively activates the appropriate resistor for each area. This parameter change approach allows the system to optimize charge distribution for each area without requiring completely different hardware configurations.
3Use of energy by moving object
If the connection line resistance is increased to reduce current, then the power consumption decreases, but the voltage charge quantity to liquid crystal units decreases causing display defects
Solution Approach 1:
The driver changes the resistor value parameter based on the area being driven to optimize the balance between power consumption and charge quantity. By selecting appropriate resistor values for different areas, the system can control the current and voltage charge quantity to achieve uniform display performance while managing power consumption effectively.
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 approach balances the charge quantity to each row of pixels, resulting in uniform display brightness across the entire pixel array by adjusting the resistance of connection lines, thereby addressing the issue of nonuniformity caused by varying line lengths.
Implementation Method 1
the resistor comprises a first resistor and a second resistor, and a resistance of the first resistor is larger than a resistance of the second resistor... when the driver determines that it is required to sequentially supply power to each row pixels of the first area, the first resistor is activated to make a power supply signal outputted by the driver pass through the first resistor... to balance charge quantity of the each row pixels
Data Source
AI summary
Disclosed is a drive control circuit, comprising a driver, a pixel array and a resistor, and the pixel array comprises M×N pixels, and M is a natural number larger than 1, and N is a natural number, and the driver is coupled to the N columns pixels through the resistor, and the resistor comprises a first resistor and a second resistor, and a resistance of the first resistor is larger than a resistance of the second resistor, and an area surrounded by the pixel array is divided into a first area and a second area, and the first area and the second area comprise at least one row pixels, and a length of a connection line of the driver with any row pixels in the first area is smaller than a length of a connection line of the driver with any row pixels in the second area.