OLED Drive Circuit Synchronizes Clock to Frame Frequency
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Solution Overview
Problem
Organic light emitting display devices exhibit non-uniform luminance characteristics when driven with different frequencies due to varying supply times of data signals, leading to increased manufacturing costs and reduced efficiency across different drive modes.
Innovation Solution
A drive circuit unit generates a reference clock based on frame frequency, controlling the time data signals are supplied to pixels, ensuring consistent luminance regardless of driving frequency by synchronizing with frame frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the organic light emitting display device is driven with different driving frequencies (e.g., NTSC 60Hz vs PAL 50Hz), then the device can support various drive modes, but the luminance becomes non-uniform because the data signal supply time varies with driving frequency
Solution Approach 1:
The patent applies dynamics by making the data signal supply time adjustable and controllable. The drive circuit unit dynamically adjusts the data signal supply time based on the detected driving frequency, allowing the system to adapt to different drive modes (NTSC, PAL, etc.) while maintaining uniform luminance. This is achieved through a feedback mechanism where the driving frequency is detected and used to control the data signal supply timing, transforming a static system into a dynamic one that can optimize performance across different operating conditions.
2Illumination intensity
If separate drive circuit units are used for each driving frequency to maintain uniform luminance, then luminance uniformity is improved, but manufacturing cost increases and manufacturing efficiency decreases
Solution Approach 1:
The patent applies universality by designing a single drive circuit unit that can function across multiple driving frequencies (e.g., both NTSC 60Hz and PAL 50Hz modes). The drive circuit unit includes a driving frequency detection unit and a data signal supply control unit that work together to enable the same hardware to adapt to different drive modes. This eliminates the need for separate drive circuit units for each frequency, reducing manufacturing costs and complexity while maintaining uniform luminance across all supported drive modes.
3Illumination intensity
If the data signal supply time is extended to improve luminance, then luminance is improved, but the device cannot maintain uniform luminance across different driving frequencies
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the data signal supply time parameter based on the detected driving frequency. When operating in NTSC mode (60Hz), the data signal supply time is set to a first value, and when operating in PAL mode (50Hz), it is set to a second value. This parameter adjustment ensures that the luminance remains uniform across different drive modes. The control unit modifies the timing parameter in response to frequency changes, allowing the system to maintain optimal luminance performance while supporting multiple drive modes.
Data Source
AI summary
An organic light emitting display device is disclosed. The device has a drive circuit which generates a reference clock to be used for synchronizing data signals supplied to the pixels. The reference clock is based on the frame frequency. As a result, the display will provide images of consistent quality which do not vary with input data frequency.