Gate Driver Scan Signal Control for Display Power Reduction
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Solution Overview
Problem
Display devices face power consumption waste due to constant high-frequency operation of gate drivers, which restricts additional functions like touch sensing and fingerprint recognition, leading to image quality defects such as flicker and noise.
Innovation Solution
Implementing a method where the gate driver controls the output of scan signals to gate lines based on an enable signal, allowing some stages to skip scan signal output during a frame period, thereby reducing unnecessary power consumption and enabling additional functions during image display periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gate driver is driven at high frequency to satisfy temporary driving conditions, then the image display performance is improved, but the power consumption increases
Solution Approach 1:
The gate driver dynamically adjusts its operating frequency based on real-time driving conditions. During temporary conditions requiring high performance, the gate driver operates at high frequency. During normal conditions, it reduces to lower frequency operation, thereby adapting to varying requirements while minimizing power consumption.
Solution Approach 2:
The gate driver implements periodic high-frequency operation only when necessary for temporary driving conditions, rather than continuous high-frequency operation. This allows the system to achieve required performance during specific periods while consuming less power during other periods when full performance is not needed.
2Device complexity
If all stages sequentially output scan signal at the same frequency, then the gate driver operation is simplified, but additional functions such as touch sensing or fingerprint recognition are restricted
Solution Approach 1:
The gate driver is divided into multiple independent stages that can operate with different scan signal frequencies. This segmentation allows certain stages to output scan signals at frequencies optimized for image display, while other stages can simultaneously output scan signals at frequencies suitable for touch sensing or fingerprint recognition, enabling multiple functions to operate concurrently without interference.
3Loss of time
If the pixel charging time is reduced to secure time for additional functions, then the time for additional functions is increased, but image quality defects such as flicker occur
Solution Approach 1:
The frame period is segmented into different time regions: a first time region dedicated to pixel charging for image display, and a second time region dedicated to additional functions such as touch sensing. This temporal segmentation allows both image quality and additional function requirements to be satisfied by allocating appropriate time resources to each function.
Solution Approach 2:
The gate driver dynamically adjusts the timing and duration of scan signal output to balance pixel charging time and time for additional functions. By optimizing the scan signal timing dynamically, the system maintains sufficient pixel charging time to prevent flicker while securing adequate time for additional functions to operate.
Data Source
AI summary
Present invention relates to a display device and a driving method thereof. In particular, the present invention is to provide a display device and a driving method thereof, which block at least one of scan signals output from gate lines according to an enable signal.