Gate Driver Output Switching for Resolution-Adaptive Displays
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Solution Overview
Problem
Existing display apparatuses face challenges in efficiently adapting their driving mode to changes in resolution or frequency of images, leading to inefficiencies and potential abnormal screen outputs during transitions.
Innovation Solution
A display apparatus with integrated circuits that can change the driving scan rate based on image resolution and frequency, using a timing controller to control gate drivers and data drivers, and an output change circuit to adjust gate signals and scan clock signals accordingly, allowing for flexible operation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display apparatus uses a fixed driving mode, then the circuit design is simple, but it cannot adapt to changes in resolution or frequency
Solution Approach 1:
The gate driver is designed with dynamic reconfigurability, allowing it to switch between different driving modes (1 gate signal per 1 gate line, or 1 gate signal per 2 gate lines) based on the display requirements. The output change circuit dynamically adjusts the gate signal output configuration in response to control signals from the timing controller, enabling the system to adapt to varying resolutions and frequencies without requiring multiple dedicated circuits.
Solution Approach 2:
The gate driver circuit is designed to perform multiple functions by changing its output configuration. The same gate driver can operate in different modes: driving each gate line individually for high resolution displays, or driving pairs of gate lines with a single signal for lower resolution or higher frequency operation. This multi-functionality is achieved through the output change circuit that reconfigures the gate signal distribution based on external control.
2Adaptability or versatility
If the display apparatus changes driving mode during operation, then it can adapt to different resolutions, but abnormal screen outputs may occur during transitions
Solution Approach 1:
Before changing the driving mode, the timing controller issues an output change control signal to the gate driver in advance. This preliminary action allows the gate driver to prepare for the mode switch by configuring its internal circuitry and signal distribution paths before the actual transition occurs, ensuring a smooth and stable switching process without causing abnormal screen outputs.
Solution Approach 2:
The system incorporates timing control mechanisms that coordinate the switching of gate driver output modes with the display panel's scanning requirements. The timing controller monitors the display state and controls the timing of mode transitions, ensuring that changes occur at appropriate moments (such as during vertical blanking intervals) to maintain screen stability and prevent visual artifacts.
3Measurement precision
If one gate signal is applied per one gate line, then high resolution display is achieved, but the driving frequency is limited
Solution Approach 1:
The gate driver dynamically changes its output configuration based on the required driving frequency and resolution. When high driving frequency is required, the output change circuit switches to mode where one gate signal controls two gate lines, effectively doubling the scanning speed. When high resolution is prioritized, it switches to one gate signal per one gate line mode, maintaining the ability to adapt to different performance requirements.
4Stability of the object's composition
If the gate driver outputs gate signals continuously, then smooth display is maintained, but energy consumption increases during blank periods
Solution Approach 1:
The gate driver is controlled to output gate signals periodically rather than continuously. During blank periods when no image data needs to be displayed, the timing controller stops generating gate signals or reduces output frequency. The output change circuit switches to a low-power mode during these intervals, maintaining display continuity during active periods while significantly reducing energy consumption during blank periods.
Data Source
AI summary
A display apparatus includes a display panel configured to display an image, a gate driver configured to supply gate signals to the display panel, a data driver connected with the display panel, and a timing controller configured to control the gate driver, wherein the timing controller controls an output type of the gate driver so that one gate signal of the gate signals is applied per one gate line or per at least two gate lines, based on an image applied from an external device.