Source Driver Gamma Voltage Circuit for LCD Power Reduction
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Solution Overview
Problem
The power consumption of source drivers in LCDs is high, leading to increased total power consumption in LCD systems, necessitating a reduction in static power consumption without affecting the operation of the source driver.
Innovation Solution
A source driver circuit comprising a gamma voltage generating circuit, a first voltage buffer, and a reference voltage driving circuit that accelerates the rising or falling speed of the gray level reference voltage, reducing static power consumption by activating the reference voltage driving circuit during transient states of the gray level reference voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source driver operates continuously to maintain display functionality, then the display operation is ensured, but the static power consumption increases
Solution Approach 1:
The reference voltage driving circuit is activated periodically or dynamically based on the transient state of the gray level reference voltage rather than operating continuously. The circuit detects when voltage transitions occur and activates the driving circuit only during those transient periods, converting continuous operation into periodic action to reduce static power consumption while ensuring display operation is maintained during actual transitions.
2Speed
If the gray level reference voltage transitions quickly to improve response speed, then the display response is improved, but the power consumption increases due to frequent transitions
Solution Approach 1:
The reference voltage driving circuit implements dynamic operation by activating only during transient states when voltage transitions are needed. The circuit monitors the gray level reference voltage and dynamically adjusts its operation, enabling fast voltage transitions when required while remaining inactive during stable states, thus achieving speed improvement without proportional power consumption increase.
Data Source
AI summary
A source driver, an operation method thereof and a driving circuit using the same are provided. The source driver includes a gamma voltage generating circuit, a first voltage buffer and a reference voltage driving circuit. The gamma voltage generating circuit receives an inter reference voltage to provide a first gray level reference voltage corresponding to a first display gray level. The first voltage buffer is used for receiving the first gray level reference voltage to provide a driving voltage. The reference voltage driving circuit is coupled to the gamma voltage generating circuit and the first voltage buffer and used for accelerating rising speed or falling speed of the first gray level reference voltage.