OLED Reset Signal Line Current Direction for Luminance Uniformity
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Solution Overview
Problem
OLED display panels experience non-uniformity due to voltage drops across conductors, leading to variations in luminance across the display panel, which deteriorate the display effect.
Innovation Solution
An OLED display panel design where the reset signal line and power signal line are connected to pixel units on the array substrate, with the current direction in the power signal line matching that of the reset signal line, allowing the reset voltage to counteract luminance non-uniformity caused by voltage drops in the power signal line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power signal line transmits power voltage to pixel units, then pixel units can operate, but voltage drop occurs due to resistance leading to display non-uniformity
Solution Approach 1:
The reset signal line applies a preliminary counteracting action by transmitting reset voltage in the opposite direction to the power signal line. This preliminary anti-action compensates for the voltage drop effects before they fully manifest, neutralizing the luminance non-uniformity caused by the power signal line's resistance.
Solution Approach 2:
The invention converts the harmful voltage drop effect into a beneficial compensation mechanism. By aligning the reset signal line's current direction with the power signal line, the voltage drop in the reset line creates a compensating effect that increases luminance in regions where the power line causes luminance reduction, thus converting the harmful resistance effect into a useful luminance uniformity correction.
2Ease of operation
If reset signal line transmits reset voltage to pixel units, then pixel units are reset, but luminance non-uniformity occurs due to voltage drop in reset signal line
Solution Approach 1:
The invention converts the harmful voltage drop in the reset signal line into a beneficial effect. By configuring the reset signal line's current direction to match the power signal line, the voltage drop causes lower reset voltage at distant pixel units, which paradoxically increases their luminance and compensates for the power line's luminance reduction, thus converting harm into benefit.
Solution Approach 2:
The invention utilizes parameter changes in the reset voltage along the reset signal line to achieve luminance uniformity. The voltage drop parameter, which would normally be harmful, is leveraged to create a gradient of reset voltages that compensates for the power distribution non-uniformity, with lower reset voltage at distant pixels increasing their luminance output.
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
This configuration effectively reduces luminance non-uniformity by ensuring that the lower reset voltage along the reset signal line increases luminance, neutralizing the effects of voltage drops in the power signal line, resulting in a more uniform display.
Implementation Method 1
when current flows in a conductor, a voltage drop will occur due to the effect of resistance in the conductor
Implementation Method 2
According to Equation I=k(Vg−Vs−Vth)2 of OLED light-emitting current
Data Source
AI summary
Embodiments of the present disclosure provide an OLED display panel and a display device, wherein the display panel includes an array substrate, a reset signal line and a power signal line. The reset signal line and the power signal line are respectively connected to pixel units of the array substrate. Therein, the power signal line is used to transmit a power voltage to the pixel units of array substrate such that the pixel units can operate, and the reset signal line is used to transmit reset voltage to the pixel units of the array substrate to reset the pixel units. The reset signal line includes a connection line connected to the pixel units of the array substrate, and a current direction in the power signal line is the same as that in the connection line.