Display Panel Voltage Control for Uniform Luminance Across Frequencies
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Solution Overview
Problem
Display devices with light-emitting diodes face challenges in maintaining uniform luminance characteristics when the operating frequency varies, leading to inconsistencies in image quality.
Innovation Solution
A display device with a panel driver that includes a driving controller to determine compensation frequencies and adjust voltage levels, such as anode initialization voltage, based on the operating frequency, and adjusts duty ratios of emission and initialization control signals to maintain uniform luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the operating frequency is varied to adapt to different display scenarios, then the adaptability and versatility of the display device is improved, but the luminance uniformity deteriorates
Solution Approach 1:
The patent applies dynamics by making the initialization voltage adjustable rather than fixed. The voltage generator dynamically changes the initialization voltage level based on the operating frequency mode (first mode with fixed frequency or second mode with variable frequency), allowing the system to adapt to different operating conditions while maintaining luminance uniformity.
Solution Approach 2:
The patent changes the parameter of initialization voltage level according to operating frequency. In the first mode, a first initialization voltage level is used, while in the second mode, a second initialization voltage level is used. This parameter change enables the display device to maintain uniform luminance characteristics across different operating frequencies.
2Stability of the object's composition
If the initialization voltage level is adjusted to maintain luminance uniformity at variable frequencies, then the luminance uniformity is improved, but the device complexity increases
Solution Approach 1:
The voltage generator is designed with multi-functionality to handle both fixed frequency and variable frequency modes. It can generate appropriate initialization voltages for different operating modes without requiring separate dedicated circuits, thereby reducing the overall increase in device complexity while maintaining luminance uniformity.
Solution Approach 2:
The panel driver acts as an intermediary between the operating frequency control and the initialization voltage generation. It receives frequency information and translates it into appropriate voltage level selections, mediating the complexity by centralizing the control logic in the driver rather than distributing it throughout the display panel.
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 ensures consistent luminance across varying operating frequencies, enhancing image quality by stabilizing the display device's performance regardless of frequency changes.
Implementation Method 1
A light-emitting display device among display devices displays an image by a light-emitting diode that generates light through recombination of electrons and holes
Data Source
AI summary
A display device includes a display panel including a plurality of pixels and a panel driver that drives the display panel in a first mode where an operating frequency is fixed, and a second mode where the operating frequency is variable. Each of the plurality of pixels includes a light-emitting element and a pixel driving circuit connected to a first electrode of the light-emitting element. The panel driver includes a driving controller that determines whether the operating frequency corresponds to one of predetermined compensation frequencies in the second mode, and outputs a voltage control signal depending on the determination result, and a voltage generator that changes a voltage level of an anode initialization voltage applied to the first electrode in response to the voltage control signal.