Gate Driver Timing Control for Display Power and Touch
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Solution Overview
Problem
Conventional gate drivers in display devices waste power due to uniform scan signal output timing and struggle to perform additional functions like touch sensing or fingerprint recognition efficiently.
Innovation Solution
Implementing a display device with a gate driver that uses independent external start signals to vary scan signal output timing for different gate lines, allowing for differential driving speeds and enabling operations like touch sensing during scan signal cessation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If uniform scan signal output timing is used for all gate lines, then the gate driver operation is simple and consistent, but power consumption increases and additional functions like touch sensing cannot be performed
Solution Approach 1:
The gate driver is divided into multiple stage groups (first stage group, second stage group, etc.), each capable of being independently controlled. This segmentation allows different regions of the display to be driven at different times, enabling power savings in inactive regions while maintaining display functionality in active regions.
Solution Approach 2:
The patent implements dynamic control of scan signal output timing by selectively enabling or disabling stage groups based on external start signals. This dynamic operation allows the system to adapt to different driving conditions, reducing power consumption when full display operation is not required and enabling touch sensing during periods when scan signals are not output.
2Productivity
If scan signals are output for all gate lines during the entire frame period, then complete image display is achieved, but power consumption increases and touch sensing operations are limited
Solution Approach 1:
The patent implements periodic control of scan signal output by dividing the frame period into different time slots for different stage groups. External start signals control when each stage group begins operation, creating a periodic pattern that ensures complete image display while allowing intervals for touch sensing operations.
Solution Approach 2:
Touch sensing operations are performed in advance during periods when scan signals are not being output to certain gate lines. By anticipating the need for touch sensing, the system schedules these operations during idle periods, ensuring both complete image display and responsive touch functionality without conflict.
3Speed
If all stage groups operate simultaneously, then fast response time is achieved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the operation of stage groups based on external start signals, allowing rapid activation when fast response is needed while enabling power savings during normal operation. This dynamic control allows the system to switch between high-speed mode (all stages active) and power-saving mode (selective stage activation).
Solution Approach 2:
The patent changes the operational parameters of the gate driver by controlling the timing and activation of different stage groups through external start signals. By adjusting which stages are active and when they operate, the system can optimize the balance between response time and power consumption based on display requirements.
Data Source
AI summary
Present invention is related to a display device and a driving method thereof, and particularly, to a display device and a driving method thereof, which control an output timing of a scan signal output to gate lines by using two or more external start signals having different timings.