OLED Data Driver Amplifier Sharing Circuit
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Solution Overview
Problem
Existing data drivers for organic light emitting display devices require a large number of amplifiers, leading to increased chip size and power consumption due to the need for separate amplifiers for each data line and sensing line, which complicates the implementation of uniform pixel driving characteristics.
Innovation Solution
A data driver design that shares amplifiers between data lines and sensing lines using a configuration with an analog-to-digital converter, first and second amplifier circuits, and switches, allowing for simultaneous operation in both display and sensing driving modes with reduced amplifier count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate amplifiers are used for each data line and sensing line, then pixel driving characteristics can be controlled accurately, but chip size and power consumption increase
Solution Approach 1:
The patent combines multiple amplifier functions into a single shared amplifier circuit. The amplifier is configured to selectively connect to different data lines and sensing lines through switching elements, allowing one amplifier to perform the functions that would traditionally require multiple separate amplifiers. This merging approach reduces the total number of amplifiers needed, thereby decreasing chip size while maintaining the capability to control pixel driving characteristics accurately through selective connection.
Solution Approach 2:
The shared amplifier circuit is designed with multi-functionality to serve multiple purposes. It can amplify signals for different data lines and sensing lines by selectively connecting to them through control switches. This universal amplifier replaces multiple dedicated amplifiers, reducing the overall component count and chip area while preserving the functional capability to maintain uniform pixel driving characteristics across different lines.
2Reliability
If separate amplifiers are used for each data line and sensing line, then pixel driving characteristics can be controlled accurately, but power consumption increases
Solution Approach 1:
By merging multiple amplifier functions into a single shared amplifier, the patent reduces the total power consumption. Instead of having multiple amplifiers operating simultaneously or sequentially, one amplifier is reused across different time periods for different lines. This consolidation eliminates redundant power consumption from multiple amplifier circuits while maintaining accurate control of pixel driving characteristics through the switching mechanism.
Solution Approach 2:
The shared amplifier operates in a periodic manner, sequentially serving different data lines and sensing lines at different time periods. During each period, the amplifier is selectively connected to a specific line through control switches, performs its amplification function, and then switches to the next line. This periodic operation allows one amplifier to replace multiple amplifiers, reducing total power consumption while maintaining the capability to control each line's pixel driving characteristics accurately.
3Reliability
If multiple amplifiers are used for data and sensing lines, then accurate pixel control is maintained, but device complexity increases
Solution Approach 1:
The patent merges multiple amplifier circuits into a single shared amplifier unit, thereby simplifying the overall device configuration. The reduction in the number of amplifiers directly decreases device complexity. The shared amplifier maintains pixel control accuracy by selectively connecting to different lines through switching elements, which are controlled based on the operating mode (sensing or display driving), thus preserving functional accuracy while reducing structural complexity.
Solution Approach 2:
The patent introduces dynamic switching control to enable a single amplifier to adaptively connect to different lines based on operational requirements. During sensing driving mode, the amplifier connects to sensing lines; during display driving mode, it connects to data lines. This dynamic reconfiguration allows one amplifier to perform multiple roles that would traditionally require multiple static amplifiers, reducing device complexity while maintaining accurate pixel control through mode-dependent switching.
Data Source
AI summary
Data drivers and organic light emitting display devices having data drivers are provided in which a number of amplifiers for driving a display panel is reduced. A data driver includes an analog-to-digital converter, first and second amplifier circuits, a first switch coupled to an output of the first amplifier circuit, and a second switch and a third switch coupled to an output of the second amplifier circuit. The first switch is configured to selectively couple the output of the first amplifier circuit to a first data line and to second data line of a display panel. The second switch is configured to selectively couple the output of the second amplifier circuit to the second data line and to the analog-to-digital converter. The third switch is configured to selectively couple the output of the second amplifier circuit to a sensing line of the display panel.