Display Device Virtual Load Unit for Uniform Pixel Voltage
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Solution Overview
Problem
The load on the initialization power line in display devices is not constant, leading to varying voltages supplied to pixels, which affects display quality.
Innovation Solution
Incorporating a virtual load unit with switches and resistors connected in series or parallel, controlled by a timing controller to maintain a constant load on the initialization power line, ensuring consistent voltage supply to pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the load on the initialization power line is not constant, then the voltage supplied to pixels varies, but this leads to non-uniform display quality
Solution Approach 1:
A virtual load unit is introduced as an intermediary component connected to the initialization power line. This virtual load unit includes a switch and resistor that can be selectively connected to maintain a constant load on the power line, thereby stabilizing the voltage supplied to pixels and ensuring uniform display quality across the display device.
Solution Approach 2:
The invention changes the load parameter of the initialization power line from variable to constant by introducing the virtual load unit. By controlling the switch to connect or disconnect the resistor, the system maintains a constant load condition that stabilizes the voltage parameter supplied to pixels, preventing display non-uniformity.
2Manufacturing precision
If a virtual load unit is added to maintain constant load, then voltage uniformity improves, but device complexity increases
Solution Approach 1:
The virtual load unit serves as a simple intermediary component with minimal circuit elements (switch and resistor) that achieves the complex goal of voltage uniformity across all pixels. This mediator approach adds only necessary complexity to solve the fundamental problem without over-engineering the solution.
Data Source
AI summary
According to the disclosure, a display device includes a pixel including a light emitting element, a pixel circuit for controlling a current flowing from a first power line to a second power line via the light emitting element, and an initialization transistor connected between an anode electrode of the light emitting element and a third power line to which a voltage of initialization power is supplied, and a power supply for supplying the initialization power. The power supply includes an initialization power supply for supplying the initialization power, and a virtual load unit connected to the third power line and for providing an additional load to the third power line.