Display Driver Power Control via Dynamic Toggle Analysis
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Solution Overview
Problem
Liquid crystal display (LCD) panels experience increased power consumption and heating in inversion mode, leading to potential damage of the data driver circuit due to the swing width of data voltage, which is not effectively managed by existing technologies.
Innovation Solution
A display apparatus and method that classify image data into preset bits, count toggles based on swing width between data voltages, calculate a final toggle number using weighted values, and determine a power control signal to adjust the power slew rate and charge share time of the output signal, thereby controlling the power level of the data driver circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inversion mode is used to prevent deterioration of the LC layer, then the reliability of the display panel is improved, but the power consumption of the data driver circuit increases and heating occurs
Solution Approach 1:
The patent dynamically adjusts the power consumption parameters of the data driver circuit based on the actual image data characteristics. By calculating toggle numbers and comparing them with threshold values, the system changes the power parameters adaptively, reducing power consumption when full inversion mode is not necessary while maintaining LC layer protection when needed.
Solution Approach 2:
The patent transitions from a static inversion mode to a dynamic power adjustment mechanism. The data driver circuit continuously monitors image data characteristics and adjusts its power consumption in real-time, making the system flexible and adaptive rather than operating in a fixed high-power state.
2Reliability
If inversion mode is used to prevent deterioration of the LC layer, then the reliability of the display panel is improved, but the data driver circuit may be damaged due to heating
Solution Approach 1:
The patent dynamically adjusts power parameters based on calculated toggle numbers from image data analysis. By changing power parameters adaptively rather than maintaining constant high power, the system reduces heating while preserving necessary inversion mode operation for LC layer protection.
Solution Approach 2:
The patent implements a feedback mechanism where the data driver circuit analyzes its own operational characteristics (toggle numbers from image data) and adjusts power parameters accordingly. This closed-loop control prevents excessive heating by reducing power when full inversion operation is not required by the current image content.
3Reliability
If power parameters are reduced to decrease heating, then the reliability of the data driver circuit is improved, but the display quality may deteriorate
Solution Approach 1:
The patent adjusts power parameters dynamically based on image data characteristics rather than using a fixed reduction. By calculating toggle numbers and comparing with thresholds, the system changes power parameters only when appropriate, maintaining display quality when full power is needed while protecting the circuit when lower power suffices.
Solution Approach 2:
The patent uses dynamic power adjustment instead of static power reduction. The data driver circuit adapts its power consumption in real-time based on actual image content requirements, ensuring display quality is maintained when necessary while reducing power and heating when the image data allows for lower power operation.
Data Source
AI summary
A display apparatus including a classifier configured to classify image data into preset data of an n-bits (“n” is a natural number), a toggle counter configured to count a number of toggles based on preset data of a present horizontal line and a previous horizontal line and to calculate a final toggle number using a weighted values corresponding to a swing width between data voltages of the present and previous horizontal lines, a determiner configured to determine a representative toggle number of a present frame based on a plurality of final toggle numbers of the present frame, compare the representative toggle number with a plurality of threshold values and determine a level of a power control signal based on a compared result.