Display Data Driver Voltage Deviation Compensation
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Solution Overview
Problem
Display apparatuses face challenges in maintaining uniform brightness due to deviations in the power supply voltage output from DC-DC converters, which affect the generation of data signals and subsequent pixel brightness.
Innovation Solution
A display apparatus with a DC-DC converter external to the display module, including a data driver that determines and compensates for power supply voltage deviations by adjusting the gamma filter power supply voltage to generate compensated gamma voltages, ensuring uniform brightness across pixel circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a DC-DC converter is used to supply power to the display module, then power supply flexibility and cost are improved, but voltage deviation occurs affecting brightness uniformity
Solution Approach 1:
The patent changes the voltage parameter by generating compensation voltages that are added to the original power supply voltage. The voltage deviation is calculated and compensated through gamma voltage adjustment, transforming the voltage parameter to achieve brightness uniformity while using cost-effective DC-DC converters.
Solution Approach 2:
The patent creates a compensation voltage signal that replicates the inverse of the voltage deviation. By measuring the voltage deviation and generating a corresponding compensation signal, the system copies the correction needed to offset the DC-DC converter's voltage variations, ensuring uniform brightness without requiring expensive precision converters.
2Manufacturing precision
If voltage deviation compensation is implemented, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges the voltage compensation function with the existing gamma voltage generation circuitry. The compensation voltage is integrated into the gamma voltage generation process, allowing brightness uniformity correction without adding separate complex compensation circuits, thus minimizing device complexity.
Solution Approach 2:
The system performs self-diagnosis and self-correction by measuring its own voltage deviation and automatically generating compensation signals. The display module monitors its power supply voltage and adjusts its gamma voltages accordingly, eliminating the need for external complex compensation devices.
Data Source
AI summary
Provided are a display apparatus and a method of operating the display apparatus that generate data signals that compensate for a deviation of a first power supply voltage output from a direct current (DC)-DC converter.