Display Data Driver Bias Control for Low-Power Pixel Charging
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Solution Overview
Problem
Display devices face challenges in minimizing power consumption while maintaining efficient pixel charging, as increasing bias voltage reduces power consumption but increases charging time, and charge sharing technologies can also increase power consumption.
Innovation Solution
A data driver is designed with shift registers, sampling latches, holding latches, a data sensing unit, multiplexer switches, and a bias voltage generator, which generates sampling pulses, stores and compares data, and controls bias voltage and charge sharing switches based on data differences to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If bias voltage is increased to quickly charge a pixel, then charging speed is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the bias voltage adjustable rather than fixed. The bias voltage generator dynamically changes the bias voltage level based on whether data changes are detected in the current frame compared to the previous frame. When no changes are detected, a lower bias voltage is applied to reduce power consumption; when changes are detected, a higher bias voltage is applied to ensure fast charging speed.
Solution Approach 2:
The patent implements parameter changes by varying the bias voltage parameter according to data change conditions. The system monitors data changes and adjusts the bias voltage parameter accordingly - using a first bias voltage level when data changes are detected and a second, lower bias voltage level when no changes are detected, thereby optimizing the trade-off between charging speed and power consumption.
2Use of energy by moving object
If charge sharing technology is used to reduce power consumption, then power consumption is reduced, but power consumption may increase due to additional switching operations
Solution Approach 1:
The patent extracts the data change detection function from the main data processing path and implements it separately through the data sensing unit. This allows the system to independently determine whether charge sharing is needed without affecting the core data processing operations, thereby reducing the complexity of switching control while still achieving power consumption reduction.
Solution Approach 2:
The patent implements feedback by using the data sensing unit to continuously monitor data changes and provide feedback signals to control the charge sharing switches and bias voltage generator. This closed-loop feedback mechanism automatically adjusts the power consumption level based on actual data change conditions, eliminating the need for complex manual switching control.
Data Source
AI summary
A data driver includes shift registers, sampling latches, holding latches, and a data sensing unit. The shift registers generate sampling pulses by shifting a source start pulse in response to a source sampling clock. Each of the sampling latches receives current data and stores the current data in response to each of the sampling pulses. Each of the holding latches receives the current data stored in each of the sampling latches, and stores the received current data in response to a source output enable signal. The data sensing unit receives the current data corresponding to an i-th sampling latch of the sampling latches or an i-th holding latch of the holding latches (i is a positive integer) and previous data stored in the i-th sampling latch or the i-th holding latch, compares the current data with the previous data, and generates control data based on the comparison result.