Gate-off Voltage Generator Stabilization for Display Panels
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Solution Overview
Problem
Liquid crystal display devices face instability in gate-off voltage due to interconnection issues, especially when the display panel size increases or operates at low temperatures, leading to fluctuations in gate-off voltage.
Innovation Solution
A display device with a gate-off voltage generator that includes a transistor and a controller, utilizing feedback mechanisms and resistors to stabilize the gate-off voltage by comparing it with a reference voltage and adjusting the base voltage accordingly, eliminating the need for additional circuit elements like charge pumps or zener diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the display panel size is increased, then the display area is improved, but the gate-off voltage stability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the gate-off voltage generated by the emitter terminal is fed back to the base terminal through a feedback circuit. The controller detects the gate-off voltage level and adjusts the base voltage accordingly to maintain stable gate-off voltage output, resolving the instability issue that arises with larger display panel sizes.
2Adaptability or versatility
If the display device is operated at low temperature, then the operating range is improved, but the gate-off voltage stability deteriorates
Solution Approach 1:
The feedback circuit continuously monitors the gate-off voltage and provides corrective adjustment to the base voltage, compensating for temperature-induced variations. This allows the display device to maintain stable gate-off voltage across a wide temperature range, improving adaptability without sacrificing reliability.
3Reliability
If additional circuit elements like charge pumps or zener diodes are added, then the gate-off voltage stability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent employs a self-regulating mechanism where the gate-off voltage generator uses its own output voltage as feedback to automatically adjust and stabilize its performance. This self-service approach eliminates the need for external charge pumps or zener diodes, maintaining voltage stability without increasing circuit complexity or cost.
Solution Approach 2:
The transistor-based gate-off voltage generator performs multiple functions: it generates the gate-off voltage, provides feedback control, and automatically stabilizes the output voltage. This multi-functionality consolidates what would traditionally require separate components, reducing overall circuit complexity while maintaining reliability.
Data Source
AI summary
A gate-off voltage generator provides a gate-off voltage to a gate line of a display panel. The gate-off voltage generator includes a transistor having a base terminal, a collector terminal, and an emitter terminal, the emitter terminal configured to output the gate-off voltage to the gate line. A controller is connected to the base terminal. A feedback circuit is connected between the gate line and the controller, the feedback circuit configured to provide to the controller a feedback voltage based upon the gate-off voltage outputted from the emitter terminal. The gate-off voltage from the emitter terminal is compared with a desired gate-off voltage in the controller and the voltage at the base terminal is controlled by the controller to provide the desired gate-off voltage to gate line.