LCD Source Driving Module Gamma Voltage Generation
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Solution Overview
Problem
Current LCD panel source driving modules face challenges in reducing power consumption, simplifying driving circuit design, and lowering fabrication costs, particularly in generating Gamma voltages due to the complexity and cost associated with programmable gamma correction methods.
Innovation Solution
A source electrode driving module incorporating a P-GAMMA driving chip with fewer output channels, coupled with first and second resistor strings, generates symmetrical positive and negative Gamma voltages through voltage dividing, reducing the number of required resistors and simplifying the design while allowing for adjustable Gamma voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If P-Gamma IC with more output channels is used to generate 20 regulated voltages, then the Gamma voltages are easy to adjust, but the number of output channels increases and the cost is higher
Solution Approach 1:
The patent segments the Gamma voltage generation function by using a P-Gamma IC with only 3 output channels instead of 20, and distributes the voltage generation task across multiple resistor strings. Each resistor string handles a subset of voltage generation, reducing the complexity of any single component while maintaining the overall functionality.
Solution Approach 2:
The patent makes the resistor strings serve multiple functions: they act as both voltage dividers and as the actual voltage generation elements. The same resistor strings that divide the reference voltage also provide the regulated Gamma voltages, eliminating the need for separate voltage generation circuits for each channel.
2Power
If resistor string with buffer amplifier chip is used to generate 20 regulated voltages, then the driving capacity is amplified, but the Gamma voltages are difficult to adjust
Solution Approach 1:
The patent changes the approach from using a buffer amplifier to adjust voltages to using resistor string configurations to generate voltages. By adjusting the resistor values or their connections, the Gamma voltages can be easily tuned without requiring complex voltage adjustment mechanisms, while still providing sufficient driving capacity through the resistor division ratio.
3Reliability
If traditional Gamma voltage generation method is used, then the display quality can be maintained, but the power consumption is high and fabrication cost is high
Solution Approach 1:
The patent replaces expensive and complex P-Gamma ICs with simpler resistor string configurations that are cheaper to fabricate and consume less power. The resistor strings use standard resistor values that are inexpensive to manufacture, reducing both the component cost and the fabrication cost while maintaining the required display quality through proper voltage division ratios.
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 reduces power consumption, simplifies the driving circuit design, and lowers fabrication costs by using a P-GAMMA driving chip with fewer output channels to generate Gamma voltages, enhancing the display quality and cost-effectiveness of LCD panels.
Implementation Method 1
the first resistor string receives a portion of the control voltages generated by the P-GAMMA driving chip, and through voltage dividing to form 2n data signal voltages with positive polarity; the second resistor string receives the other portion of the control voltages generated by the P-GAMMA driving chip, and through voltage dividing to form 2n data signal voltages with negative polarity
Data Source
AI summary
The present invention discloses a source electrode driving module for providing a data signal to an LCD unit, comprising: a Gamma correction chip and a source electrode driving chip, wherein, the Gamma correction chip comprises a P-GAMMA driving chip with three to eight output channels; the P-GAMMA driving chip is used for generating multiple control voltages providing to the source electrode driving chip; the source electrode driving chip comprises a first resistor string and a second resistor string; the multiple control voltages generated by the P-GAMMA driving chip connect into the first resistor string and the second resistor string according to turning points of a Gamma curve of the LCD unit, wherein, n is an integer, and 6≦n≦10. The present also disclose an LCD panel including the source electrode driving module described above.