Scan Driver Clock Masking for Display Power Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face issues with power consumption and sensing time due to unnecessary supply of scan signals to scan lines after a pixel row has been sensed, leading to inefficient operation and potential image luminance inconsistencies.
Innovation Solution
A scan driver and display device design that masks clock signals after a sensing period, preventing unnecessary scan signal supply to subsequent scan lines and optimizing signal direction based on the position of the sensing scan line, thereby reducing power consumption and sensing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If scan signals are sequentially supplied to all scan lines to complete the sensing operation, then the sensing operation is terminated after the last scan line, but power consumption is unnecessarily consumed and unnecessary time is required after a specific pixel is selected
Solution Approach 1:
The patent applies preliminary action by masking the clock signal before the sensing operation begins. Specifically, the clock signal is masked in advance to prevent unnecessary scan signals from being supplied to scan lines after the pixel row to be sensed has been selected. This preliminary masking action eliminates both the unnecessary time consumption and power consumption that would occur if scan signals were continuously supplied to all scan lines through the last scan line.
2Ease of operation
If scan signals are supplied to select a specific pixel, then the pixel can be selected and receive data signal, but unnecessary scan signal supply occurs to subsequent scan lines after sensing
Solution Approach 1:
The patent applies the extraction principle by removing the unnecessary portion of the scan signal supply process. Specifically, the clock signal masking function extracts and eliminates the harmful continuous supply of scan signals to scan lines after the sensing operation is complete. This allows the pixel selection function to operate correctly while preventing the energy loss from unnecessary scan signal supply to subsequent scan lines.
3Productivity
If clock signals are continuously supplied to drive scan signals through all stages, then scan signals are supplied to all scan lines, but unnecessary power consumption occurs after sensing period
Solution Approach 1:
The patent applies periodic action by making the clock signal supply periodic rather than continuous. The clock signal is masked during specific periods (after the sensing operation) while being active during necessary periods (during pixel selection and sensing). This periodic masking approach maintains productivity during required operations while eliminating power consumption during unnecessary periods when scan signals would otherwise be supplied to all scan lines.
Data Source
AI summary
In a scan driver and a display device including the same, a first input terminal of a stage receives a scan start signal or an output signal of a previous stage when a first control signal is supplied, a second input terminal of the stage receives one of two clock signals, a third input terminal of the stage receives the other of the two clock signals, and a fourth input terminal of the stage receives a scan start signal or an output signal of a next stage when a second control signal is supplied, and a first power source is outputted from an output terminal of the stage when a first clock signal and a second clock signal are low levels.