Display Power Control for Flicker-Free Luminance Transitions
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Solution Overview
Problem
Display devices experience flickering phenomena when luminance is increased in dark environments, making it difficult to view images effectively.
Innovation Solution
A display device with a power supply system that controls voltage changes in driving power and initialization power to pixels, including a timing controller that manages luminance control signals, ensuring smooth transitions between different luminance modes to prevent flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminance of the display device is increased to improve visibility in dark environments, then image visibility is improved, but flickering phenomenon occurs
Solution Approach 1:
The patent changes the voltage parameter of the second driving power dynamically based on the luminance control signal. When the luminance control signal transitions from disabled to enabled state, the power supply increases the voltage of the second driving power from a first voltage to a second voltage higher than the first voltage, thereby changing the operating parameters to prevent flickering while maintaining high luminance.
Solution Approach 2:
The power supply performs preliminary action by maintaining the second driving power at the second voltage for a predetermined period of time before gradually decreasing it to a third voltage. This preliminary maintenance ensures stable high luminance output initially, preventing flickering during the transition phase, and only then adjusts to the final voltage level.
2Illumination intensity
If the voltage of the second driving power is increased to maintain high luminance, then image visibility is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the voltage of the second driving power adjustable rather than fixed. The power supply dynamically changes the voltage level based on the luminance control signal state and operational requirements, transitioning between different voltage levels (first voltage, second voltage, third voltage) to optimize between luminance output and power consumption according to actual needs.
Solution Approach 2:
The power supply changes the voltage parameter of the second driving power from a first voltage to a second voltage higher than the first voltage when the luminance control signal changes from disabled to enabled state. This parameter change allows the system to achieve high luminance when needed while having the capability to reduce power consumption when high luminance is not required.
Data Source
AI summary
A display device includes: a power supply configured to supply a voltage of first driving power to a first power line, and supply a voltage of second driving power to a second power line; a display panel including pixels connected to scan lines and data lines, and each including a first transistor configured to control current supplied from the first power line to the second power line via a light emitting element; and a timing controller configured to supply a luminance control signal to the pixels. Each of the pixels includes: a control transistor connected in parallel to some sub-transistors of the corresponding first transistor, and configured to be turned on in response to receipt of a luminance control signal having an enabled state. The power supply changes the voltage of the second driving power when the luminance control signal having the enabled state is supplied to the pixels.