OLED Data Driver Timing Control for High Resolution
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Solution Overview
Problem
As the resolution of OLED displays increases, the time available for changing source voltages corresponding to data signals decreases, leading to insufficient voltage changes for red and blue color signals, which affects image quality.
Innovation Solution
The OLED display controls the data driving unit to begin outputting data signals before the horizontal period begins, ensuring sufficient time for voltage changes by using a demultiplexing structure with a timing control unit to manage the scan and data driving units and demultiplexers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of OLED display is increased, then the image quality is improved, but the time available for changing source voltages corresponding to data signals decreases
Solution Approach 1:
The data driving unit begins outputting data signals before the horizontal period starts, allowing source voltages to be changed in advance. This preliminary action ensures that sufficient time is available for voltage changes even when the horizontal period is shortened due to higher resolution requirements.
2Measurement precision
If the quantity of pixels is increased to increase resolution, then the display quality is improved, but the quantity of data-lines and scan-lines increases leading to higher manufacturing cost
Solution Approach 1:
The data driving unit is divided into multiple data output units, each responsible for driving specific data-lines. This segmentation allows the system to handle higher resolutions by distributing the driving task across multiple units, reducing the complexity burden on any single component.
Solution Approach 2:
The data output units are designed to be multi-functional, capable of driving multiple data-lines and supporting various pixel types (red, green, blue, white). This universality reduces the need for dedicated circuits for each pixel type, thereby reducing overall device complexity and manufacturing cost.
3Productivity
If the horizontal period is decreased due to higher resolution, then more pixels can be displayed, but the source voltage change time for red and blue color signals becomes insufficient
Solution Approach 1:
Source voltages are changed before the horizontal period begins, ensuring that the voltage transition is completed in advance. This allows the shortened horizontal period to still accommodate sufficient voltage change time for all color signals including red and blue.
Solution Approach 2:
The timing of voltage changes is dynamically adjusted based on the horizontal period duration. When the horizontal period is shortened due to higher resolution, the system adapts by initiating voltage changes earlier, maintaining adequate transition time despite the compressed schedule.
Data Source
AI summary
An organic light emitting diode (OLED) display is disclosed. In one aspect the display includes a display panel having first through fourth pixels and a scan driving unit that outputs a scan signal to the display panel. The display also includes a data driving unit that alternately outputs a first data signal for the first pixels and a second data signal for the second pixels to the display panel, alternately outputs a third data signal for the third pixels and a fourth data signal for the fourth pixels to the display panel, and begins outputting the first and third data signals before one horizontal period begins The display further includes a demultiplexing unit that alternately applies the first and second data signals to the first and second pixels and the third and fourth data signals to the third and fourth pixels.