Display Controller Load Sensing Voltage Control
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Solution Overview
Problem
In display devices, a delay in determining the load of input data can lead to increased power consumption due to a large scale factor applied to frames with relatively small load data, resulting in unnecessary high luminance and power usage.
Innovation Solution
A controller that compares the sensing driving current and load of previous frame data with limit current and load thresholds to adjust the driving voltage, reducing power consumption by outputting a driving voltage control signal when the sensing driving current exceeds the limit current and the load is below a certain percentage of the maximum load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the controller reduces luminance based on load of (N-1)th frame data, then power consumption is reduced, but when load of Nth frame data is large, the luminance cannot be reduced due to one-frame delay, causing power consumption to increase
Solution Approach 1:
The controller performs preliminary determination of the load of current frame data before applying the scale factor. Specifically, the overpower determiner calculates the load of current frame data (Nth frame) in advance, and this preliminary result is used to adjust the luminance for the current frame, eliminating the one-frame delay. This allows the controller to proactively reduce luminance when the current frame load is large, rather than reacting to the previous frame's load.
Solution Approach 2:
The controller implements a feedback mechanism where the load determination result is immediately fed back to adjust the luminance. The overpower determiner continuously monitors the load of current frame data and provides real-time feedback to the luminance control mechanism, ensuring that luminance adjustments are based on the most current load information rather than delayed historical data.
2Device complexity
If the controller uses load of (N-1)th frame data to determine scale factor, then processing is simplified, but power consumption increases when Nth frame data has large load
Solution Approach 1:
The controller dynamically adapts its load determination approach based on timing requirements. The overpower determiner is configured to determine the load of current frame data (Nth frame) rather than relying solely on previous frame data, making the system dynamic and responsive to current conditions. This dynamic adjustment ensures that luminance control is optimized for each frame based on its actual load characteristics.
Solution Approach 2:
The invention changes the parameter being monitored from 'load of previous frame data' to 'load of current frame data'. By modifying which frame's load is used for determination, the system achieves more accurate and timely luminance control without significantly increasing processing complexity, as the load calculation methodology remains consistent.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a power supply which provides a driving voltage to the pixels, and a controller which outputs a first signal by comparing a sensing driving current generated by sensing driving currents flowing through the pixels with a limit current, outputs a second signal by comparing a load of previous frame data with a limit load, and outputs a driving voltage control signal for controlling the driving voltage to the power supply based on the first signal and the second signal.