Display Device Voltage Feedback for IR Drop Compensation
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Solution Overview
Problem
Display devices experience voltage drops (IR drops) in the transmission of driving voltages from the driving voltage generator to the data driver, leading to inefficiencies and potential overheating due to increased resistance.
Innovation Solution
A display device design that includes a feedback mechanism within the data driver, utilizing a connector with resistance elements and capacitors to regulate the driving voltage, forming a current path between the driving voltage generator's pads, and using a voltage controller to adjust voltage levels based on feedback, thereby compensating for voltage drops and minimizing increases in driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving voltage is increased to compensate for voltage drops, then the voltage stability is improved, but the power consumption increases and overheating occurs
Solution Approach 1:
The patent implements a feedback mechanism where the data driver measures the actual driving voltage received and feeds back this information to the driving voltage generator. The driving voltage generator then adjusts its output based on the feedback to maintain stable voltage levels without excessive power consumption. This is achieved through a feedback voltage line and voltage measurement circuitry that continuously monitors and regulates the voltage delivery.
Solution Approach 2:
The patent dynamically adjusts the driving voltage parameter based on actual conditions. Instead of maintaining a fixed high voltage to compensate for drops, the system changes the voltage parameter in real-time based on feedback, adjusting only enough to overcome measured voltage drops and minimize power consumption while maintaining stability.
2Reliability
If a feedback mechanism is implemented, then the voltage drop compensation is improved, but the device complexity increases
Solution Approach 1:
The patent adds a feedback voltage line connecting the data driver to the driving voltage generator, enabling the data driver to send voltage measurement information back to the generator. This feedback loop allows automatic compensation for voltage drops without requiring complex external control systems.
Solution Approach 2:
The system performs self-regulation where the data driver itself measures the voltage condition and communicates this to the driving voltage generator, which then self-adjusts its output. This eliminates the need for external voltage monitoring and control equipment, reducing overall system complexity while maintaining effective voltage drop compensation.
Data Source
AI summary
A display device includes a display panel including a pixel, a driving voltage generator that provides a driving voltage to a data driver, the data driver that provides a data voltage to the pixel and provides a feedback voltage, which is generated by feeding back the driving voltage within the data driver, to the driving voltage generator, and a timing controller that controls the data driver.