Source Driver Chip Gamma Voltage Generation for LCD PCB Simplification
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Solution Overview
Problem
Conventional LCD driving systems have complex and costly system PCB board layouts due to the integration of common and gamma voltage generation circuits, which complicate the generation and distribution of driving voltages for liquid crystals.
Innovation Solution
Integrating gamma and common voltage generation circuits within each source driver chip, utilizing a control module, digital-to-analog converter, and output buffer to generate and distribute voltages based on pixel values and chip select control signals, simplifying the PCB layout and enabling cost-effective voltage generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If voltage generation circuits are integrated into source driver chips, then device complexity and PCB layout are simplified, but manufacturing precision requirements increase
Solution Approach 1:
The patent merges the voltage generation circuits with the source driver chips into a single integrated unit. This combination eliminates the need for separate voltage generation modules on the PCB, thereby simplifying the overall system layout and reducing the number of external connections while maintaining functional performance
2Ease of manufacture
If voltage generation circuits are integrated into source driver chips, then ease of manufacture improves, but device complexity increases
Solution Approach 1:
The patent segments the display driver system into multiple independent source driver chips, each capable of autonomous voltage generation. This segmentation allows each chip to be manufactured and tested independently, simplifying the overall manufacturing process while the internal integration provides the necessary functionality
3Productivity
If gamma voltages are generated locally in each source driver chip, then productivity improves, but device complexity increases
Solution Approach 1:
Each source driver chip is designed to generate its own required gamma voltages locally through integrated digital-to-analog converters and voltage generation circuits. This self-service capability eliminates the need for centralized voltage generation and distribution, improving productivity by enabling parallel operation of multiple chips while the internal complexity is managed through standardized design
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 simplifies the system PCB layout, reduces costs, and allows for efficient generation and distribution of driving voltages to each pixel, improving the luminance control of liquid crystals by integrating voltage generation within each source driver chip.
Implementation Method 1
at least one digital-to-analog converter outputting the Gamma voltage according to the selection code
Data Source
AI summary
The present invention discloses an apparatus for driving a display in which each pixels of the display receives a driving voltage and a common voltage, and a luminance of each pixel is determined by a difference between the received driving voltage and the common voltage. The apparatus comprises a plurality of source driver chips, each of which receives a pixel value and generates the driving voltage corresponding to the pixel value according to a plurality of Gamma voltages, wherein at least one of the Gamma voltages is generated by one of the source driver chips.