AMOLED Drive Control Circuit for Horizontal Mura Reduction
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Solution Overview
Problem
The existing AMOLED display technology suffers from horizontal Mura phenomena due to luminance differences between adjacent rows, caused by hardware material defects and process errors, leading to uneven screen brightness.
Innovation Solution
A drive control circuit comprising a drive integrated circuit, a transmit control circuit, and a scan drive circuit that adjusts the duty cycle of drive signals and decreases data signal amplitude to generate optimized drive and data signals, which are then converted to enhance pixel control, thereby reducing the duration of OLED illumination and minimizing luminance disparities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the duty cycle of drive signal is increased to reduce horizontal Mura, then the OLED illumination time is shortened and Mura phenomenon is reduced, but the overall screen luminance may decrease
Solution Approach 1:
The patent changes the duty cycle parameter of the drive signal from a conventional low value (e.g., 3%) to a higher value (e.g., 60% or above). This parameter change shortens the OLED illumination time per frame, thereby reducing the horizontal Mura phenomenon while maintaining acceptable overall luminance through compensation mechanisms.
Solution Approach 2:
The patent introduces dynamic adjustment mechanisms where the drive control circuit dynamically controls the duty cycle of drive signals transmitted to different row groups. This dynamic control allows optimization of illumination time distribution across different rows, reducing Mura effects while maintaining overall display brightness.
2Illumination intensity
If the amplitude of data signal is decreased to maintain overall luminance, then the luminance per unit time of each OLED is improved, but the data signal strength is reduced
Solution Approach 1:
The patent decreases the amplitude parameter of the data signal while simultaneously adjusting the duty cycle parameter. This combined parameter change ensures that the reduced amplitude is compensated by the extended duty cycle, maintaining both overall luminance and sufficient signal strength for reliable pixel control.
3Duration of action of stationary object
If the duty cycle is adjusted to shorten OLED illumination time, then the Mura occurrence time is reduced, but the display brightness control becomes more complex
Solution Approach 1:
The patent divides the display screen into multiple row groups and applies different duty cycle settings to different groups. This segmentation allows independent optimization of illumination time for each group, reducing Mura effects while managing complexity through structured division rather than individual control of all pixels.
Solution Approach 2:
The patent introduces a drive control circuit as an intermediary between the drive integrated circuit and the pixel circuits. This intermediary component handles the complex duty cycle adjustments and signal modifications, isolating the complexity from the core display structure and making the system more manageable.
Data Source
AI summary
A drive control circuit, a driving method thereof and a display device are provided. The drive control circuit includes a drive integrated circuit, a transmit control circuit, a scan drive circuit, and a pixel circuit. The drive integrated circuit adjusts a duty cycle of a drive signal to generate a first drive signal and transmits the first drive signal to the transmit control circuit. The drive integrated circuit decreases the amplitude of a data signal to generate a first data signal and transmits the first data signal to the scan drive circuit. The transmit control circuit converts the received first drive signal into a second drive signal with a preset duty cycle and transmits the second drive signal to the pixel circuit. The preset duty cycle of the second drive signal is greater than the duty cycle of the drive signal to be outputted.