Shared Grey-Scale Voltage Generator for Display Driver Power Reduction
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Solution Overview
Problem
Conventional display driver circuits with separate grey-scale voltage generators for red, green, and blue colors require a larger layout area and consume more power due to the need for three times the layout area and power consumption of conventional generators, and they continue to consume power even when driving the same grey-scale voltage for all pixels.
Innovation Solution
A display driver circuit design that includes separate grey-scale voltage generators with a grey-scale voltage generation unit using first to third grey-scale voltage generators, each generating n grey-scale voltages by selecting maximum and minimum reference voltages and distributing predetermined voltages, with a reference voltage selection register, gamma selection register, and gamma voltage adjustment units to optimize voltage distribution and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate grey-scale voltage generators are used for R, G and B colors, then luminance accuracy is improved, but layout area increases three times
Solution Approach 1:
The patent merges the first and second grey-scale voltage generators into a single integrated generator that can selectively output different grey-scale voltages for R, G and B pixels. This consolidation reduces the layout area from three times the conventional size to a single unified structure, while maintaining the capability to provide color-specific grey-scale voltages when needed.
Solution Approach 2:
The integrated grey-scale voltage generator is designed with multi-functionality, capable of operating in different modes: generating separate grey-scale voltages for R, G and B pixels when luminance accuracy is required, and generating a common grey-scale voltage for all pixels when power reduction is needed. This universal design eliminates the need for three separate generators while preserving all required functions.
2Measurement precision
If separate grey-scale voltage generators are used for R, G and B colors, then luminance accuracy is improved, but power consumption increases three times
Solution Approach 1:
The patent implements a dynamic grey-scale voltage generator that can adaptively change its operating mode based on real-time requirements. The generator includes control logic that determines whether to operate in separate voltage generation mode (for luminance accuracy) or common voltage generation mode (for power saving), dynamically switching between these states to optimize the balance between accuracy and power consumption.
Solution Approach 2:
The system changes operational parameters by controlling the selection of grey-scale voltages applied to different pixel types. The integrated generator can adjust its output configuration dynamically, changing from providing three distinct grey-scale voltage sets to providing a single common voltage set, thereby reducing power consumption by a factor of three when color-specific voltages are not required.
3Adaptability or versatility
If all separate grey-scale voltage generators are driven, then all color pixels can be driven, but power consumption cannot be reduced
Solution Approach 1:
The integrated grey-scale voltage generator implements periodic or conditional operation modes. Based on the display content and pixel type requirements, the system periodically switches between generating separate grey-scale voltages for R, G and B pixels and generating a common grey-scale voltage for all pixels. This periodic action allows the system to reduce power consumption by utilizing the common voltage mode during periods when color-specific voltages are not required.
Data Source
AI summary
A display driver circuit configured to be shared by three grey-scale voltage generators to be respectively used with red (R), green (G) and blue (B) colors. In particular, two of the three grey-scale voltage generators share first and second resistor strings, gamma voltage selectors, and gamma adjustment buffers provided in the other grey-scale voltage generator, thereby reducing the size and power consumption of the display driver circuit. Also, when only a single grey-scale voltage is output, it is possible to deactivate the grey-scale voltages provided by two of the grey-scale generators and further reduce power consumption.