Pixel Power Switching for Brightness-Adaptive Display Circuits
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Solution Overview
Problem
Existing display devices face challenges in reducing power consumption, particularly in managing power supply voltages to pixel circuit blocks to optimize brightness levels.
Innovation Solution
A display device design that includes a switching circuit part to selectively provide high or low power supply voltages to pixel circuit blocks, utilizing PMOS and NMOS transistors to control power distribution based on brightness requirements, and a separator to disconnect cathode electrodes for improved power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single power supply voltage is applied to all pixel circuit blocks, then the circuit structure is simple, but power consumption cannot be optimized for different brightness areas
Solution Approach 1:
The power supply system is segmented into multiple independent power supply voltage lines (first power supply voltage line and second power supply voltage line) that can be selectively applied to different pixel circuit blocks. The switching circuit part divides the display area into high-brightness areas and low-brightness areas, with each area receiving appropriate power voltage through dedicated switching elements (first switching element and second switching element), enabling localized power optimization without requiring complete system redesign
Solution Approach 2:
Different power supply voltage levels are applied to different spatial regions of the display based on brightness requirements. High-brightness pixel circuit blocks receive higher power supply voltage through the first switching element, while low-brightness pixel circuit blocks receive lower power supply voltage through the second switching element, achieving local power optimization tailored to specific display area requirements
2Illumination intensity
If high power supply voltage is applied to all areas, then high brightness can be achieved, but power consumption increases
Solution Approach 1:
The patent applies different power supply voltage levels to different spatial regions based on brightness requirements. High-brightness areas receive higher voltage through the first switching element while low-brightness areas receive lower voltage through the second switching element, ensuring that power consumption is optimized locally without compromising overall display brightness quality
Solution Approach 2:
The power supply voltage parameter is dynamically adjusted based on the brightness requirements of different pixel circuit blocks. By changing the voltage level parameter (high voltage for high-brightness areas, low voltage for low-brightness areas) through selective switching, the system achieves optimal balance between brightness output and power consumption
3Use of energy by moving object
If low power supply voltage is applied to all areas, then power consumption is reduced, but brightness is insufficient
Solution Approach 1:
The display area is segmented into high-brightness areas and low-brightness areas, with corresponding power supply strategies applied to each segment. Low-brightness areas can operate at lower power consumption through the second switching element, while high-brightness areas maintain adequate illumination through the first switching element, achieving overall power optimization without sacrificing necessary display quality
Data Source
AI summary
A display device includes a plurality of pixel circuit blocks each including at least one pixel driving circuit part including a plurality of transistors, a light-emitting element electrically connected to the pixel driving circuit part and including an anode electrode and a cathode electrode, a first power supply voltage line, a second power supply voltage line, a switching circuit part electrically connected to the pixel circuit blocks in a one-to-one basis and including a first switching element connected to the first power supply voltage line and turned on by a first voltage level, a second switching element connected to the second power supply voltage line and turned on by a second voltage level different from the first voltage level, and a data line electrically connected to the switching circuit part which provides the first voltage level or the second voltage level to the switching circuit part.