Data Driver Feedback Voltage Control for Display Power Drop
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Solution Overview
Problem
Voltage drop occurs in the process of delivering driving voltage to circuits within a 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 adjust and stabilize the driving voltage, forming a current path between pads of the driving voltage generator, and incorporating a voltage controller to compensate for voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a driving voltage is delivered through a connector to the data driver, then the data driver can be powered, but voltage drop occurs due to resistance in the connector and internal circuits
Solution Approach 1:
The patent implements a feedback mechanism where the actual driving voltage at the data driver is fed back to the driving voltage generator. The voltage controller adjusts the output voltage based on this feedback, compensating for voltage drops in the connector and internal circuits to ensure stable voltage delivery.
Solution Approach 2:
The voltage controller dynamically changes the output voltage parameter based on feedback information. By detecting the actual voltage at the data driver and adjusting the generator output accordingly, the system compensates for resistance-induced voltage drops and maintains stable power delivery.
2Power
If the driving voltage generator outputs higher voltage to compensate for voltage drop, then the data driver receives sufficient voltage, but power consumption increases
Solution Approach 1:
The feedback mechanism allows the voltage controller to precisely compensate for voltage drops by adjusting the output voltage based on actual measurements. This prevents excessive voltage compensation and reduces unnecessary power consumption while ensuring the data driver receives adequate voltage.
Solution Approach 2:
The voltage controller dynamically adjusts the output voltage parameter to the minimum necessary level to compensate for voltage drops, rather than using a fixed high voltage. This optimized parameter adjustment reduces power consumption while maintaining sufficient voltage delivery.
3Reliability
If feedback line is opened or disconnected, then the feedback mechanism fails, but driving voltage may increase excessively causing damage
Solution Approach 1:
The patent incorporates a pull-down resistor connected to ground that acts as a safety mechanism. If the feedback line opens or disconnects, this resistor ensures the feedback node is pulled to ground, preventing excessive voltage buildup and potential damage to the voltage controller and other components.
Solution Approach 2:
The pull-down resistor serves as an intermediary safety element between the feedback line and ground. It mediates the situation by providing a controlled discharge path for the feedback node, preventing dangerous voltage levels while maintaining normal operation when the feedback line is intact.
4Stability of the object's composition
If resistance elements are added to the connector for voltage compensation, then voltage stability improves, but device complexity increases
Solution Approach 1:
Rather than adding resistance elements to the connector, the patent uses a feedback mechanism with a voltage controller that dynamically adjusts the output voltage. This software-based compensation achieves voltage stability without increasing the physical complexity of the connector structure.
Solution Approach 2:
The patent replaces potential mechanical modifications to the connector (such as adding resistance elements) with an electronic feedback control system. The voltage controller uses electronic signals to compensate for voltage drops, achieving the same stability effect with simpler hardware architecture.
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.