Display Device Power Saving Unit Voltage Control
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Solution Overview
Problem
Conventional display devices face challenges in reducing power consumption during display-off periods and transitioning between normal and power-saving modes, leading to issues like drastic luminance changes, pattern changes, and flashing.
Innovation Solution
A display device with a power saving unit that controls the power supply to vary the driving frequency and voltage levels based on the display mode, incorporating a timing controller to output specific voltage change signals, and inserting a black display period during mode transitions to smooth voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display panel is temporarily turned off or luminance is reduced in a display-off period to reduce power consumption, then power consumption is reduced, but display quality deteriorates due to drastic luminance changes and flashing during mode transitions
Solution Approach 1:
The patent applies preliminary action by introducing a black display period before the actual display-off period. The timing controller outputs a black display signal to switch the display panel to black display mode in advance, allowing the power supply unit to gradually reduce power voltage before the display is completely turned off. This prevents sudden luminance changes and flashing while still achieving power saving objectives.
Solution Approach 2:
The patent implements dynamics by making the power voltage adjustable and variable based on display mode requirements. The power supply unit dynamically changes power voltage levels according to whether the display is in normal mode or power saving mode, and adjusts the timing of voltage reduction to occur during the black display period rather than abruptly at mode transition, thereby maintaining display quality while reducing power consumption.
2Use of energy by moving object
If the driving frequency of the display panel is reduced during the use or driving time to reduce power consumption, then power consumption is reduced, but display responsiveness and quality deteriorate
Solution Approach 1:
The patent applies segmentation by dividing the display operation into distinct modes: normal display mode with standard driving frequency for high responsiveness, and power saving mode with reduced driving frequency for lower power consumption. The timing controller manages mode transitions and selects appropriate driving frequencies based on system requirements, allowing the display to segment its operation between these two states rather than using a single fixed frequency.
Data Source
AI summary
Provided are a display device and driving method thereof. A display device comprises a display panel configured to display an image, a data driver configured to supply a data signal to the display panel, a gate driver configured to supply a gate signal to the display panel, a power supply unit configured to output a power voltage to the display panel, and a power saving unit configured to control the power supply unit to vary a level of the power voltage according to a display mode of the display panel.