Pixel Drive Voltage Stabilization for Consistent Display Luminance
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Solution Overview
Problem
Display devices experience changes in image luminance levels due to fluctuations in power supply voltage, leading to inconsistent pixel performance.
Innovation Solution
A display device architecture that includes a reference voltage generator and gamma voltage generator to stabilize pixel drive voltage, generating maximum and minimum gamma voltages to maintain consistent luminance levels despite voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply voltage is supplied to pixels, then pixels can operate and display images, but luminance levels change due to voltage fluctuations
Solution Approach 1:
The patent introduces a reference voltage generator and gamma voltage generator as intermediary components between the power supply and the pixel array. These generators create stable reference voltages (ELVDD_REF) and gamma voltages (VG) that are used to drive the pixels, thereby isolating the pixel operation from direct power supply voltage fluctuations and maintaining consistent luminance levels.
Solution Approach 2:
The patent changes the voltage parameters by generating multiple differentiated voltage levels (pixel drive voltage PVDD, reference voltage ELVDD_REF, gamma voltages VG) from the input voltage. By adjusting and stabilizing these voltage parameters through dedicated generator circuits, the system compensates for input voltage fluctuations and maintains stable pixel luminance output.
2Reliability
If pixel drive voltage is applied to maintain luminance, then luminance consistency is improved, but device complexity increases due to additional voltage generation circuits
Solution Approach 1:
The patent merges the reference voltage generation and gamma voltage generation functions into integrated circuits that work together with the pixel array. The reference voltage generator and gamma voltage generator are combined into a cohesive voltage supply system that provides multiple stabilized voltage levels simultaneously, reducing overall system complexity compared to separate independent voltage regulation circuits for each function.
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
Ensures consistent luminance levels across pixels by maintaining constant current flow through light-emitting diodes, resulting in high-quality image display.
Implementation Method 1
a pixel including a light emitting diode and a first transistor
Data Source
AI summary
A display device includes a pixel array that includes a pixel including a light emitting diode and a first transistor that includes a source terminal to which a pixel drive voltage is applied and a gate terminal to which a data signal is applied, and outputs drive current generated based on the voltage difference between the gate terminal and the source terminal, to the light emitting diode, and a display driver IC that generates the data signal based on the pixel drive voltage.