Display Drive Circuit Gamma Voltage Duty Cycle Power Reduction
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Solution Overview
Problem
High-resolution display panels consume excessive power, leading to short battery life in mobile devices, and often fail to support high-definition (HD) picture display effectively.
Innovation Solution
A display drive circuit with a Gamma reference voltage generator that operates in two duty times, outputting Gamma reference voltage during charge time and common voltage during non-charge time, along with a line buffer, level converter, and digital-analog converter to efficiently manage power consumption and support HD picture display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display panel is increased to support HD pictures, then the picture quality is improved, but the power consumption increases and battery life decreases
Solution Approach 1:
The Gamma reference voltage generator operates in periodic cycles, alternating between first duty time (outputting Gamma reference voltage) and second duty time (outputting common voltage). This periodic operation allows the circuit to provide high-resolution display signals only when necessary while reducing power consumption during non-charging periods, thus resolving the contradiction between HD picture support and power consumption.
Solution Approach 2:
The patent implements dynamic duty cycle adjustment where the ratio of first duty time to second duty time can be configured based on display requirements. By dynamically adjusting when Gamma reference voltage is output versus when common voltage is output, the system adapts between power-saving mode and HD display mode, resolving the contradiction between resolution and power consumption.
2Measurement precision
If the display drive circuit continuously outputs Gamma reference voltage to maintain picture quality, then the display quality is improved, but the power consumption increases
Solution Approach 1:
The Gamma reference voltage generator uses periodic duty cycles with distinct first duty time (outputting Gamma reference voltage for quality display) and second duty time (outputting common voltage to save power). This periodic operation maintains display quality during charging periods while significantly reducing power consumption during non-charging periods, resolving the contradiction between display quality and energy loss.
Solution Approach 2:
The patent extracts the Gamma reference voltage output function from continuous operation and implements it only during specific first duty time periods. By separating the Gamma reference voltage output from continuous operation and confining it to necessary charging periods, the system maintains display quality when needed while eliminating unnecessary power consumption during non-charging periods.
Data Source
AI summary
A display drive circuit is provided, including a line buffer, a lever converter, a D/A converter, a Gamma reference voltage generator, and a buffer. The Gamma reference voltage generator has a first duty time and second duty time. In the first duty time, the Gamma reference voltage generator outputs the Gamma voltage to the buffer to charge pixel electrodes of a display having the display drive circuit. In the second duty time, the Gamma reference voltage generator outputs a common voltage to the buffer.