Data Driver Bias Current Control for Display Power Reduction
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Solution Overview
Problem
The existing data drivers for display apparatuses consume high power due to the constant application of data voltages, leading to increased energy consumption and heat generation.
Innovation Solution
A data driver system with bias units corresponding to each buffer, which selectively generates and applies bias currents based on pixel image data variations, reducing power consumption by controlling currents in units of buffers during each horizontal period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data voltages are constantly applied to drive the display apparatus, then the display function is maintained, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the bias current adjustable rather than constant. Each bias unit dynamically changes its bias current level based on the variation amount of pixel image data, allowing the system to adapt power consumption to actual display needs while maintaining reliable display function.
Solution Approach 2:
The patent changes the parameter of bias current from a fixed value to a variable value that depends on image data characteristics. By adjusting bias current levels according to pixel image data variation, the system reduces power consumption during low-activity periods while ensuring adequate performance when needed.
2Power
If high bias current is applied to all buffers, then data voltage output capability is maintained, but power consumption increases
Solution Approach 1:
The patent applies local quality by assigning different bias current levels to different bias units based on their specific requirements. Each bias unit independently adjusts its bias current according to the local characteristics of its associated buffer and the corresponding pixel image data, rather than applying a uniform current to all buffers.
Solution Approach 2:
The patent segments the bias current control into multiple independent bias units, each corresponding to a specific buffer. This segmentation allows individualized control of bias current for each buffer, enabling optimized power distribution across the system based on actual operational needs.
3Use of energy by moving object
If bias current is reduced to save power, then power consumption decreases, but data voltage output performance may deteriorate
Solution Approach 1:
The patent implements feedback by using the pixel image data variation amount as a basis for adjusting bias current. The system monitors the characteristics of the image data being displayed and automatically adjusts the bias current accordingly, ensuring adequate performance is maintained while minimizing power consumption.
Solution Approach 2:
The patent applies partial action by providing bias current at reduced levels during periods when full performance is not required. By adjusting bias current based on actual image data variation, the system applies only the necessary amount of current needed for the current display task, avoiding excessive power consumption.
Data Source
AI summary
A data driver includes buffers respectively outputting data voltages corresponding to pixel image data, bias units corresponding to the buffers in a one-to-one correspondence and driving the buffers, respectively, and a global setting part applying control level values to the bias units. Each of the bias units includes a bias signal generating unit that selects one control level value among the control level values based on a corresponding pixel image data among the pixel image data and generates a bias signal having a control level corresponding to the selected control level value and a current generating unit that generates a corresponding bias current in response to the bias signal and applies the corresponding bias current to a corresponding buffer among the buffers.