Selective Pixel Driver for Partial Display Power Reduction
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Solution Overview
Problem
Display devices experience increased power consumption during partial display driving due to continuous supply of scan and emission control signals across the entire display panel, even when only a partial area is being used.
Innovation Solution
A pixel driver with multiple stages, each including a pixel driving signal generator, shift register, and selection circuit, which selectively outputs pixel driving signals or off signals based on image data and pixel driving signals, allowing only the necessary areas of the display panel to receive signals, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scan and emission control signals are continuously supplied to the entire display panel, then the display device can operate reliably, but power consumption increases during partial display driving
Solution Approach 1:
The pixel driver is divided into multiple stages, each corresponding to a specific region of the display panel. Each stage includes a pixel driving signal generator, shift register, and selection circuit that can independently control signal output to its associated pixel region. This segmentation enables selective activation of only those stages corresponding to the display area, allowing continuous reliable signal supply to active regions while disabling signal output to inactive regions, thereby reducing overall power consumption.
Solution Approach 2:
Different regions of the display panel are treated differently based on their activation status. The selection circuit in each stage selectively outputs either a pixel driving signal or an off signal to pixels in its corresponding region. This local quality approach ensures that active regions receive continuous reliable driving signals while inactive regions receive off signals, maintaining reliability where needed while saving power in inactive areas.
2Area of stationary object
If pixel driving signals are supplied to all pixels, then complete display coverage is achieved, but power is wasted in areas not displaying images
Solution Approach 1:
The pixel driver system dynamically adjusts its operation based on the actual display requirements. The selection circuit in each stage responds to control signals that indicate whether the corresponding region should be active or inactive. When a region is not displaying an image, the selection circuit switches to outputting off signals instead of pixel driving signals. This dynamic adaptation allows the system to maintain full display coverage capability when needed while minimizing energy waste by disabling signal output to inactive regions.
3Stability of the object's composition
If multiple stages are dependently connected to provide continuous signals, then signal stability is maintained, but control flexibility for partial display is reduced
Solution Approach 1:
The pixel driver is segmented into multiple independently controllable stages, each with its own pixel driving signal generator, shift register, and selection circuit. While stages are connected in sequence to maintain signal continuity across the display panel, each stage can be independently activated or deactivated. This segmentation provides both signal stability through continuous chaining and control flexibility through independent stage activation, resolving the contradiction between stability and adaptability.
Solution Approach 2:
Each stage in the pixel driver is designed with universal functionality to handle both active and inactive region operations. The selection circuit in each stage can universally output either pixel driving signals or off signals based on control inputs. This multi-functionality allows the same stage structure to serve different purposes - providing continuous stable signals to active regions and suppressing signals to inactive regions - thereby achieving both signal stability and partial display control flexibility.
Data Source
AI summary
A pixel driver includes a plurality of stages, with each stage including a pixel driving signal generator, a shift register, and a selection circuit. The pixel driving signal generator generates a pixel driving signal. The shift register receives image data and the pixel driving signal and generates an output control signal for determining whether to output the pixel driving signal based on the image data and the pixel driving signal. The selection circuit selectively outputs the pixel driving signal in response to the output control signal.