Display Device Pixel Group Time-Sharing Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
General display devices face issues with high power consumption, IR-drop, and no light occurrence during peak usage, especially when photographing, and have large circuit areas due to high pixels per inch (PPI) panels.
Innovation Solution
The display device incorporates a light emitting unit, current source, voltage comparator, and emission control unit, where pixel groups receive emission enable signals, voltage data, and a common ramp signal, allowing for non-overlapping data setup periods to reduce peak power consumption and prevent IR-drop and no light issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If all pixels perform data setup operation at the same time, then the display device can maintain simple timing control, but the on-peak power consumption increases causing IR-drop and no light issues
Solution Approach 1:
The pixel array is divided into multiple pixel groups, and the data setup operations of different pixel groups are performed at different time periods (time-division multiplexing). This segmentation of the simultaneous operation into sequential operations reduces the peak current demand while maintaining complete data setup for all pixels.
Solution Approach 2:
The patent implements periodic data setup operations for different pixel groups across multiple time periods. Each pixel group has its designated data setup period, creating a periodic pattern of operation that distributes power consumption over time rather than concentrating it at once.
2Measurement precision
If high pixels per inch (PPI) panel is used to improve display quality, then the resolution and display quality improve, but the circuit area becomes too large
Solution Approach 1:
The patent merges the data setup and dimming operations into a unified control framework using the voltage comparator and ramp signal mechanism. This integration allows for more efficient use of circuit resources and reduces the overall circuit area required for high PPI displays.
Solution Approach 2:
The voltage comparator and ramp signal generation circuitry serve multiple functions: they control both the data setup timing and the dimming operation for multiple pixel groups. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby reducing overall circuit area.
Data Source
AI summary
A display device is provided. The display device of the disclosure includes a light emitting unit, a current source, a voltage comparator, and an emission control unit. The current source is configured to output a supply current. The voltage comparator is configured to receive a voltage data and a ramp signal. The emission control unit receives an emission enable signal, and coupled to the light emitting unit, the current source, and the voltage comparator. The voltage comparator outputs a comparison signal to the emission control unit according to the voltage data and the ramp signal. The emission control unit outputs a driving current to the light emitting unit according to the supply current, the emission enable signal, and the comparison signal.