Display Device Multiple Emission Periods Driving Current
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Solution Overview
Problem
As the resolution of display devices increases, the limited amount of driving current supplied to each light-emitting diode results in defective displays, particularly under low-gradation conditions where current is low.
Innovation Solution
The display device incorporates a specific configuration of transistors, capacitors, and power supply voltages, with multiple emission enable periods and inhibit periods, allowing for a greater first power supply voltage during emission enable periods and a lesser voltage during inhibit periods, to ensure sufficient driving current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the resolution of display devices is increased, then the image quality is improved, but the amount of driving current supplied to each light-emitting diode is reduced
Solution Approach 1:
The emission period is divided into multiple sub-emission periods within one frame period, allowing the light-emitting diode to emit light in segmented intervals. This segmentation enables sufficient total light output even with limited driving current per period, resolving the contradiction between high resolution (which limits current) and adequate brightness
Solution Approach 2:
The light-emitting diode operates in periodic emission cycles with multiple emission periods and inhibit periods within each frame. This periodic operation allows the device to accumulate sufficient light output over time while maintaining low current during each individual emission period, addressing the current limitation in high-resolution displays
2Loss of energy
If the amount of driving current is limited, then the power consumption is reduced, but the display quality becomes defective
Solution Approach 1:
By segmenting the emission into multiple periods, the total energy consumption remains low while the cumulative light output maintains display quality. Each segment uses limited current, but the aggregation of segments achieves the required display performance
Solution Approach 2:
The patent changes the temporal distribution of current by introducing multiple emission periods with varying current levels. During emission periods, current is supplied to produce light, while during inhibit periods, current is reduced or stopped, optimizing the balance between power consumption and display quality
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 enhances the amount of driving current, reducing the occurrence of defective displays by effectively managing the light-emitting diode's operation across high-resolution images.
Implementation Method 1
An organic light-emitting display device may display an image using light-emitting diodes which generate light by recoupling of electrons and holes
Data Source
AI summary
In a display device including pixels, each of the pixels may include: a first transistor coupled to a first node, a first power supply voltage line, and a second node; and a light-emitting diode coupled to the second node and a second power supply voltage line. Each image frame may include at least two emission enable periods for the light-emitting diode, and at least one emission inhibit period between the at least two emission enable periods.