Dynamic Voltage Adjustment in AMOLED Drive Chip Gamma Divider
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Solution Overview
Problem
Existing drive chips for AMOLED display panels suffer from significant power loss due to a fixed power supply voltage to operational amplifiers, leading to high power consumption, especially when displaying low grayscale images.
Innovation Solution
The drive chip incorporates a gamma voltage divider circuit with operational amplifiers that receive dynamically adjusted voltages from a digital-to-analog converter (DAC) and a low-voltage stabilized voltage supply, reducing the voltage difference between power-supply ends and optimizing power consumption based on input data voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed power supply voltage is provided to operational amplifiers in the gamma voltage divider circuit, then the operational amplifiers can maintain stable operation, but the power consumption increases significantly especially when displaying low grayscale images
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed power supply voltage to a dynamically adjustable power supply voltage for the operational amplifiers. The power supply voltage is adjusted according to the grayscale level being displayed, allowing the voltage difference between power supply ends to vary dynamically. This resolves the contradiction by enabling stable operation through controlled voltage adjustment while reducing power consumption during low grayscale display operations.
Solution Approach 2:
The patent changes the voltage parameter of the power supply dynamically based on the grayscale level. When displaying low grayscale images, the power supply voltage is reduced to minimize the voltage difference across operational amplifiers, thereby reducing power loss. This parameter change approach maintains operational stability while optimizing power consumption across different display scenarios.
2Power
If a large voltage difference is provided between positive and negative power supply ends of operational amplifiers, then the operational amplifiers have sufficient power for operation, but the power loss increases significantly
Solution Approach 1:
The patent implements dynamic adjustment of the voltage difference between power supply ends based on the actual operational requirements. The power supply voltage is modulated according to the grayscale level, creating a dynamic voltage difference that matches the operational needs. This resolves the contradiction by providing sufficient power when needed while minimizing energy loss during low-power operations.
Solution Approach 2:
The patent changes the voltage parameter dynamically to optimize the balance between operating power and power loss. By adjusting the power supply voltage according to grayscale levels, the system maintains adequate operating power for functional requirements while reducing the voltage difference (and thus power loss) during low grayscale display operations.
3Ease of manufacture
If fixed power is supplied to operational amplifiers on each channel, then the circuit design is simple, but unnecessary power loss occurs when displaying low grayscale images
Solution Approach 1:
The patent introduces dynamic voltage adjustment capability while maintaining relatively simple circuit architecture. The power supply voltage is controlled dynamically based on grayscale levels, adding minimal complexity to the circuit design while significantly reducing unnecessary power loss during low grayscale operations. This resolves the contradiction between design simplicity and energy efficiency.
Solution Approach 2:
The patent implements parameter change (voltage adjustment) with minimal circuit complexity. By controlling the power supply voltage parameter dynamically according to grayscale requirements, the system achieves energy efficiency improvements without substantially complicating the circuit design, thus resolving the contradiction between ease of manufacture and energy loss reduction.
Data Source
AI summary
A display product and a drive chip for driving a display panel are provided. The drive chip includes a gamma voltage divider circuit, which includes a voltage-dividing resistor string, consisting of resistors connected in series, configured to generate binding-point grayscale voltages; OPs, each of which is disposed at an output channel of the binding-point grayscale voltage, each OP having a positive power end receiving a first voltage and a negative power end receiving a second voltage, the first voltage greater than the second voltage; a low-voltage stabilized supply, providing the fixed second voltage to the negative power end; and a DAC, providing the first voltage to the positive power end. The first voltage provided by the DAC is dynamically adjusted based on grayscale or data voltages that are to be inputted to the display panel. By this way, the power loss of the drive chip is reduced.