Display Device Reference Voltage Generator Feedback Compensation
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Solution Overview
Problem
Display devices face issues with variations in driving voltage due to resistance and capacitance between lines, leading to unwanted patterns on the screen, such as crosstalk, which affect display quality.
Innovation Solution
A display device with a reference voltage generator that measures the driving voltage and adjusts first and second reference voltages based on data offset and distance offset information, using a gamma voltage generator to produce grayscale voltages, thereby compensating for voltage variations and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed reference voltage is used for driving pixels, then the circuit design is simple, but the driving voltage varies due to line resistance and capacitance causing unwanted patterns on the display screen
Solution Approach 1:
The patent implements feedback by measuring the actual driving voltage at the pixel level and using this measurement to adjust the reference voltage. The voltage measurement unit measures the driving voltage applied to the pixels, and the reference voltage generator adjusts the reference voltage based on this measured value to compensate for variations caused by line resistance and capacitance, thereby eliminating unwanted display patterns.
Solution Approach 2:
The patent applies preliminary action by pre-calculating and storing compensation values in a lookup table that accounts for expected voltage drops across different display regions. The distance offset generator uses the pixel's position information to retrieve pre-computed compensation values, allowing the system to proactively compensate for voltage variations before they affect display quality.
2Reliability
If the reference voltage is adjusted to compensate for voltage variations, then display quality improves, but the control complexity increases
Solution Approach 1:
The patent segments the voltage compensation into multiple independent components: a basic reference voltage generator, a distance offset generator that handles spatial variations, and a data offset generator that handles signal-specific variations. Each component operates independently and contributes to the final compensated reference voltage, making the overall complex system manageable through modular design.
Solution Approach 2:
The patent introduces intermediary components that simplify control: a distance offset generator that translates pixel position into compensation values, and a data offset generator that processes data voltage information. These intermediaries bridge the gap between simple position/data inputs and complex voltage adjustments, reducing direct control complexity.
3Reliability
If voltage compensation is implemented for all pixels, then display uniformity improves, but the processing time increases
Solution Approach 1:
The patent performs preliminary action by pre-calculating distance offset values for all possible pixel positions and storing them in a lookup table during manufacturing or initialization. During operation, the system only needs to retrieve the pre-computed value based on pixel position, avoiding real-time complex calculations and minimizing processing time while maintaining display uniformity.
4Reliability
If line resistance and capacitance are reduced to minimize voltage variation, then voltage stability improves, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent uses feedback to compensate for voltage drops without requiring physical changes to the线路. By measuring the actual voltage at the pixel level and adjusting the reference voltage accordingly, the system achieves voltage stability through software-based compensation rather than expensive hardware modifications such as reducing line resistance or capacitance.
Data Source
AI summary
A display device includes: a display unit including a plurality of pixels to display an image according to a driving voltage; a data driver to provide data signals to the plurality of pixels; a gamma voltage generator to provide a plurality of grayscale voltages to the data driver; and a reference voltage generator to provide a first reference voltage and a second reference voltage to the gamma voltage generator. The gamma voltage generator is to generate the plurality of grayscale voltages by dividing the first reference voltage and the second reference voltage, and the reference voltage generator is to generate a sensing driving voltage by measuring the driving voltage from the display unit, and to generate the first reference voltage and the second reference voltage by utilizing the sensing driving voltage and a reference driving voltage.