Display Driver IC Power Domain Segmentation for Leakage Reduction
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Solution Overview
Problem
Display driving circuits face increased power consumption and leakage current issues due to larger size and function blocks, particularly in standby mode, which affects mobile devices using batteries as power sources.
Innovation Solution
A display driver integrated circuit with multiple power domains, where the graphic data processing unit and memory operate in the lowest voltage domain, and a D/A converter operates in a higher voltage domain, with control switches managing voltage supply based on operation mode to reduce leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of function blocks in display driving circuit is decreased to reduce area, then the area occupied by shift register and latch circuit is reduced, but leakage current increases
Solution Approach 1:
The display driving circuit is divided into multiple power domains (first power domain for shift register and latch circuit, second power domain for other function blocks), allowing independent voltage control of each segment. This segmentation enables the circuit to reduce leakage current by blocking voltage supply to specific segments when not in use, while maintaining the ability to operate all blocks when needed.
Solution Approach 2:
The patent implements dynamic voltage control by using control switches to dynamically block or supply voltage to different power domains based on operation mode. In standby mode, the first control switch blocks voltage to the graphic data processing unit, and the second control switch manages voltage to memory, adapting the power supply state to current operational requirements and reducing unnecessary leakage.
2Reliability
If the display device operates in standby mode with continuous voltage supply, then the circuit remains ready for operation, but power consumption increases due to leakage current
Solution Approach 1:
The patent implements dynamic voltage control by using control switches to dynamically block or supply voltage to different power domains based on operation mode. In standby mode, the first control switch blocks voltage to the graphic data processing unit, and the second control switch manages voltage to memory, adapting the power supply state to current operational requirements and reducing unnecessary leakage.
Solution Approach 2:
Different power domains are assigned different voltage supply states based on their functional requirements. The memory operates in the first power domain and receives continuous voltage to maintain data readiness, while the graphic data processing unit operates in the second power domain and has voltage blocked during standby. This local differentiation of voltage supply quality optimizes both power consumption and operational readiness.
Data Source
AI summary
A display driver integrated circuit includes a regulator configured to convert an externally supplied driving voltage to a working voltage corresponding to one of a plurality of power domains of the display driver integrated circuit, a graphic data processing unit configured to process image data input to the graphic data processing unit, and output the image data to a display panel, a control switch configured to control a supply of the working voltage to the graphic data processing unit, and a core logic unit configured to receive the working voltage from the regulator and control the control switch in response to a mode of operation of the display driver integrated circuit.