Display Power Supply Voltage Compensation for Luminance Uniformity
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Solution Overview
Problem
Display devices experience luminance uniformity issues due to temporal variations in power supply voltage, particularly during progressive emission modes where pixels emit light at different times, leading to horizontal bands and uneven luminance across rows.
Innovation Solution
A display device with a power supply system that includes a feedback circuit and controller to adjust the voltage level of the power supply voltage applied to the display panel, compensating for temporal variations by generating a feedback voltage based on the dropped power supply voltage and adjusting the duty cycle of switching signals to maintain consistent luminance across rows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If progressive emission mode is used to drive pixels sequentially row-by-row, then power consumption is reduced and display response time is improved, but temporal variation in power supply voltage causes luminance uniformity to deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the power supply voltage is monitored during progressive emission, and adjustment signals are generated to compensate for detected voltage variations. This feedback loop maintains stable luminance across different rows despite temporal power supply fluctuations, resolving the contradiction between improved response time and maintained luminance uniformity.
Solution Approach 2:
The patent dynamically adjusts power supply voltage parameters in real-time during progressive emission operation. By changing voltage levels compensatorily based on detected variations, the system maintains consistent luminance output across rows while preserving the fast response benefits of sequential pixel driving.
2Illumination intensity
If power supply voltage is increased to improve luminance brightness, then display brightness is improved, but power consumption increases and temporal variation causes luminance non-uniformity
Solution Approach 1:
The patent employs dynamic power supply voltage adjustment rather than static high voltage. The power supply level is adaptively changed in real-time based on actual display needs and detected voltage variations, achieving adequate luminance brightness while avoiding excessive power consumption and temporal instability associated with continuously high voltage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively compensates for temporal variations in power supply voltage, ensuring that pixels at different rows have similar luminances, thereby eliminating horizontal bands and improving luminance uniformity.
Implementation Method 1
the power supply to receive the power supply voltage from the output power supply line and to adjust a voltage level of the power supply voltage applied to the input power supply line based on the power supply voltage from the output power supply line
Implementation Method 2
a feedback circuit coupled to the output power supply line at the one or more edge portions of the display panel, the feedback circuit to generate a feedback voltage based on the power supply voltage received from the output power supply line
Implementation Method 3
a controller to generate the at least one switching signals for input into the power supply voltage generator, and to adjust a duty cycle of the at least one switching signal based on the feedback voltage
Data Source
AI summary
A display panel includes input power supply line coupled to a power supply at one or more edge portions of the display panel, and an output power supply line coupled to the input power supply line at a predetermined portion of the display panel. The input power supply line receives the power supply voltage, and the output power supply line receives the power supply voltage from the input power supply line. The power supply is coupled to the output power supply line at the one or more edge portions of the display panel, and receives the power supply voltage from the output power supply line to adjust a voltage level of the power supply voltage based on the power supply voltage from the output power supply line. The predetermined portion is at a location different from an edge of the display panel.