Light Emission Driving Circuit Frequency Segmentation for Power Reduction
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in reducing power consumption while maintaining display quality, especially when handling multiple images with different refresh frequencies.
Innovation Solution
The implementation of a light emission driving circuit and a scan driving circuit that utilize masking circuits and transistors to adjust driving frequencies based on image type, with the light emission driving circuit outputting light emission driving signals and switching signals in response to clock signals and masking clock signals, and the scan driving circuit outputting scan signals and switching signals in response to scan clock signals and masking clock signals, allowing for reduced power consumption by adjusting the frequency of still image regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device drives all regions at normal frequency to maintain display quality, then display quality is maintained, but power consumption increases
Solution Approach 1:
The display panel is divided into multiple regions (first display region and second display region) with different refresh frequency requirements. The light emission driving circuit is correspondingly segmented into multiple light emission driving stages, each capable of operating at different frequencies independently, allowing moving image regions to be driven at normal frequency while still image regions operate at lower frequency, thus reducing overall power consumption while maintaining display quality where needed
Solution Approach 2:
The light emission driving circuit dynamically adjusts the operating frequency of different light emission driving stages based on the type of image content being displayed. The circuit can switch between normal mode (all stages at normal frequency) and low power mode (some stages at reduced frequency), enabling adaptive power management that maintains display quality for moving images while reducing power consumption for still images
2Use of energy by moving object
If the display device reduces driving frequency to lower power consumption, then power consumption is reduced, but display quality deteriorates
Solution Approach 1:
Different regions of the display panel are assigned different quality levels based on their content requirements. The first light emission driving stage corresponds to regions displaying moving images and operates at normal frequency to maintain high display quality, while the second light emission driving stage corresponds to regions displaying still images and operates at reduced frequency, providing sufficient quality for static content while reducing power consumption
3Use of energy by moving object
If the light emission driving circuit operates in low power mode with reduced frequency, then power consumption is reduced, but the circuit complexity increases due to masking circuits
Solution Approach 1:
The masking circuit integrates multiple functions into a single circuit block: it receives the masking clock signal, generates the second carry signal based on the masking clock signal and light emission driving signal, and controls the switching between normal and low power modes. This merging of functions reduces the overall circuit complexity compared to having separate control circuits for each function
Data Source
AI summary
A light emission driving circuit includes a driving circuit configured to output a light emission driving signal to a first output terminal and output a switching signal to a first node in response to clock signals and a first carry signal, and a first masking circuit configured to output a second carry signal to a second output terminal in response to a masking clock signal, the light emission driving signal, and the first switching signal. The masking clock signal is a signal which is maintained at a first level during a normal mode and periodically changes during a low power mode.