OLED Pixel Circuit Array Segmentation for Moving Picture Response Time
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Solution Overview
Problem
Existing OLED display panels suffer from moving picture ghosting, where users observe a blurred or unclear display of frames during switching, due to the phenomenon of image ghosting, which is not effectively mitigated by increasing refresh frequency.
Innovation Solution
A pixel circuit array is divided into two groups, with each pixel circuit connected to different signal sensing lines, and a gate driving circuit controls the light emission of one group while the other group is in a non-emitting state, shortening the light emitting time duration of each pixel without increasing the refresh frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the refresh frequency is increased to mitigate moving picture ghosting, then the display response time is improved, but the energy consumption and device complexity increase
Solution Approach 1:
The pixel circuit is divided into two groups (first group and second group) that are driven alternately. During the display of one frame, only pixels in the first group emit light while pixels in the second group remain in a non-emitting state, and vice versa for the next frame. This segmentation allows the effective display response time to be halved without increasing the overall refresh frequency, thereby reducing energy consumption compared to illuminating all pixels at high refresh rates.
2Loss of time
If the refresh frequency is increased to mitigate moving picture ghosting, then the display response time is improved, but the device complexity increases
Solution Approach 1:
The pixel array is segmented into two groups with separate control mechanisms. The gate driving circuit includes first and second gate lines that independently control the two groups. This segmentation enables alternating activation of pixel groups, effectively reducing the display response time without requiring a complete system redesign or significant increase in overall refresh frequency, thus limiting the increase in device complexity.
3Object-affected harmful factors
If all pixel circuits emit light continuously at high refresh frequency, then the moving picture ghosting is reduced, but the energy consumption increases
Solution Approach 1:
The pixel circuits are activated in a periodic alternating pattern. During one display period, pixels in the first group emit light while pixels in the second group remain off. In the next display period, the roles are reversed. This periodic alternating action maintains effective response time for reducing moving picture ghosting while significantly reducing energy consumption compared to continuous illumination of all pixels at high refresh rates.
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 approach effectively mitigates moving picture ghosting by improving the Moving Picture Response Time (MPRT) of the display panel, ensuring clearer image transitions without the need for higher refresh rates.
Implementation Method 1
the light emitting device is an organic light emitting diode
Data Source
AI summary
A pixel circuit array, a display panel, a method for driving a pixel circuit array, and a method for driving a display panel are provided. The pixel circuit array may include: a first signal sensing line (SENSE1) and a second signal sensing line (SENSE2); and N pixel circuits arranged in a column. All of the N pixel circuits are divided into a first group and a second group, each pixel circuit in the first group is coupled to the first signal sensing line (SENSE1), and each pixel circuit in the second group is coupled to the second signal sensing line (SENSE2) different from the first signal sensing line (SENSE1), where N is a positive integer greater than 1.