LTPO Display Panel Coupling Capacitor Design for Color Mixing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display panels with LTPO backplanes experience abnormal color mixing after switching from a high refresh rate to a low refresh rate due to different degrees of luminance change in sub-pixels of different colors.
Innovation Solution
A display panel design that includes a substrate, a driving circuit layer, and a light emitting device layer, where the driving circuit layer comprises pixel driving circuits with specific transistor configurations and coupling capacitors, and the light emitting device layer includes light emitting devices of different colors. The coupling capacitors are designed with varying capacitances to adjust the luminance change difference between the light emitting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If adaptive refresh rate technology is implemented to save power consumption, then power consumption is reduced, but abnormal color mixing occurs after switching from high refresh rate to low refresh rate
Solution Approach 1:
The patent applies local quality by assigning different coupling capacitor values to different color sub-pixels (red, green, blue). Each sub-pixel receives a customized coupling capacitor value that compensates for its specific luminance characteristics, thereby achieving uniform color mixing across all sub-pixels while maintaining the adaptive refresh rate functionality for power savings.
2Reliability
If different coupling capacitor values are assigned to different color sub-pixels, then color mixing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the driving circuit into separate control paths for different color sub-pixels, with each sub-pixel having its own dedicated coupling capacitor. This segmentation allows independent optimization of each sub-pixel's luminance characteristics while maintaining overall system simplicity through modular design.
Data Source
AI summary
A display panel and a display device are provided. A second transistor of a first pixel driving circuit is connected to a reset signal line and a first light emitting device, and a second transistor of a second pixel driving circuit is connected to the reset signal line and a second light emitting device. A first light emitting device emits first color light having a first wavelength and a second light emitting device emits second color light having a second wavelength. The first wavelength is greater than the second wavelength. The reset signal line and first node of the first pixel driving circuit have a first coupling capacitor, the reset signal line and the first node of the second pixel driving circuit have a second coupling capacitor, and a first coupling capacitance of the first coupling capacitor is greater than a second coupling capacitance of the second coupling capacitor.