Gamma Circuit Layout Space Reduction via Voltage Conversion
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Solution Overview
Problem
Liquid crystal display panels require both positive and negative gamma reference voltages for alternate driving modes, leading to increased circuit complexity and cost due to the need for multiple resistors and a DC-DC converter chip in existing gamma circuits.
Innovation Solution
A gamma circuit with positive and negative gamma voltage output terminals connected by voltage conversion circuits, allowing the negative gamma reference voltage to be generated from the positive gamma reference voltage, reducing the number of resistors and simplifying the DC-DC converter structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate voltage dividing circuits are used for positive and negative gamma reference voltages, then both positive and negative gamma reference voltages can be output, but the number of resistors increases and circuit complexity increases
Solution Approach 1:
The patent merges the positive and negative gamma reference voltage generation into a single voltage dividing circuit. The circuit uses a chain of resistors (R1-R6) that generates both positive gamma reference voltages (GAM1-GAM5) and negative gamma reference voltages (GAM6-GAM10) from a single power supply voltage, eliminating the need for separate voltage dividing circuits and reducing the total number of resistors required.
Solution Approach 2:
The voltage dividing circuit is designed to serve multiple functions simultaneously. The same resistor chain and power supply voltage are used to generate both positive and negative gamma reference voltages, making the circuit universal for both positive and negative driving modes of the liquid crystal display panel.
2Adaptability or versatility
If a DC-DC converter chip is used to generate negative power supply voltage, then negative gamma reference voltages can be generated, but the cost increases and the chip area occupied increases
Solution Approach 1:
The patent extracts and eliminates the DC-DC converter chip from the gamma circuit by using a direct resistor-chain voltage dividing approach. The negative power supply voltage is generated passively through the resistor chain without requiring an active DC-DC conversion chip, thereby reducing chip area occupation and component cost.
Solution Approach 2:
The patent replaces the expensive DC-DC converter chip with simple, low-cost resistors that form the voltage dividing circuit. This substitution uses inexpensive passive components instead of expensive active conversion chips, reducing overall circuit cost and complexity.
3Adaptability or versatility
If multiple resistors are used in the voltage dividing circuit, then both positive and negative gamma reference voltages can be output, but the layout space occupied increases
Solution Approach 1:
The patent merges the generation of multiple positive and negative gamma reference voltages into a single compact voltage dividing circuit using a resistor chain. This consolidated approach reduces the layout space compared to having separate voltage dividing circuits for positive and negative voltages, as all voltage generation functions are integrated into one circuit block.
Data Source
AI summary
The present disclosure relates to the field of display technologies, and provides a gamma circuit. The gamma circuit includes: a plurality of positive gamma voltage output terminals, a plurality of negative gamma voltage output terminals in one-to-one correspondence with the plurality of positive gamma voltage output terminals, and a plurality of voltage conversion circuits. Each of the voltage conversion circuits is configured to output a negative gamma reference voltage to the negative gamma voltage output terminal based on a positive gamma reference voltage output by the positive gamma voltage output terminal corresponding to the negative gamma voltage output terminal.