Display Data Driver Bias Switching for Low-Power Static Images
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Solution Overview
Problem
Existing display devices face high power consumption due to constant bias current application in data drivers, regardless of image dynamics, necessitating a solution to reduce current consumption while maintaining stable operation.
Innovation Solution
A data driver configuration with a voltage output circuit and a voltage maintenance circuit, along with a selection circuit, allows for adjusting bias current based on image patterns, using multiple amplifiers for dynamic images and a single amplifier for static images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant bias current is applied to the output portion of the data driver, then stable operation is maintained, but current consumption increases
Solution Approach 1:
The patent implements dynamic bias current adjustment by detecting whether the display content is static or dynamic and adjusting the bias current accordingly. When static content is detected, a first (lower) bias current is applied to reduce power consumption. When dynamic content is detected, a second (higher) bias current is applied to maintain stable operation and prevent display artifacts. This dynamic adaptation resolves the contradiction between stable operation and reduced current consumption.
Solution Approach 2:
The patent changes the bias current parameter based on the temporal characteristics of the display content. By monitoring frame-to-frame changes in pixel data, the system determines whether to apply a reduced bias current (for static images) or a normal bias current (for dynamic images). This parameter change allows the system to optimize power consumption while maintaining display quality when needed.
2Manufacturing precision
If multiple amplifiers are used in the voltage output circuit, then image quality is maintained for dynamic images, but device complexity increases
Solution Approach 1:
The patent segments the amplification function into two distinct circuits: a voltage output circuit with multiple amplifiers for high-quality dynamic image processing, and a voltage maintenance circuit with a single amplifier for static image maintenance. The selection circuit chooses which circuit to activate based on content type. This segmentation allows the system to have high image quality capability when needed while reducing active complexity during static display periods.
Solution Approach 2:
The voltage maintenance circuit with its single amplifier serves multiple functions: it maintains data line voltages during static display periods and can quickly transition to support dynamic content when needed. This multi-functionality reduces the need for continuously operating multiple amplifiers, thereby reducing device complexity while maintaining image quality capabilities.
Data Source
AI summary
A data driver can include a voltage output circuit including a plurality of digital-to-analog converters configured to convert pixel data into analog data voltages, and a plurality of first amplifiers configured to amplify the analog data voltages and output amplified analog data voltages to a plurality of data lines. Also, the data driver can further include a voltage maintenance circuit including a second amplifier configured to amplify a predetermined data voltage into an amplified predetermined data voltage, and output the amplified predetermined data voltage to the plurality of data lines in common, and a selection circuit configured to selectively connect either the voltage output circuit or the voltage maintenance circuit to the plurality of data lines based on a pattern of the pixel data.