Sampling Voltage Supply Unit for OLED Data Driver Area Reduction
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Solution Overview
Problem
Conventional organic light emitting display devices have a large area occupation due to the design of sampling latches, which reduces the space available for the pixel portion and increases power consumption.
Innovation Solution
A data driver with a sampling voltage supplying unit that supplies a common power supply voltage to sampling latches in response to the output signal of a shift register, reducing the number of transistors and area occupied by each sampling latch, and incorporating a sampling voltage supplying unit with transistors to manage positive and negative voltages efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each sampling latch is designed with its own power supply voltage control circuit, then the sampling latch can be reliably controlled, but the area occupied by the sampling latch increases and power consumption increases
Solution Approach 1:
The patent merges the power supply voltage control function into the shift register output signal itself. Instead of each sampling latch having its own independent power supply control circuit, the shift register's output signal is used in common to control the power supply voltage for all sampling latches simultaneously. This combining approach reduces the number of separate control circuits while maintaining reliable control through the sequential nature of the shift register output.
Solution Approach 2:
The shift register output signal serves multiple functions: it acts as both the data drive signal and the power supply voltage control signal for the sampling latches. This multi-functionality eliminates the need for separate power supply control circuits for each sampling latch, thereby reducing the overall area occupied while maintaining reliable control through the universal signal's sequential activation.
2Manufacturing precision
If each sampling latch has independent power supply voltage control, then control precision is improved, but the number of transistors increases and area occupied increases
Solution Approach 1:
The patent combines the power supply voltage control function with the shift register output signal, eliminating the need for separate transistor-based control circuits for each sampling latch. The shift register's output signal directly controls the power supply voltage for all sampling latches, significantly reducing the total number of transistors required while maintaining precise control through the sequential timing inherent in the shift register operation.
3Ease of operation
If conventional sampling latch design is used, then each sampling latch can be independently controlled, but the data driver occupies large area and consumes excessive power
Solution Approach 1:
The patent merges the control functions into a single shift register output signal that is used in common for all sampling latches. This approach maintains ease of operation through the sequential control provided by the shift register while dramatically reducing power consumption by eliminating redundant power supply control circuits for each individual sampling latch.
Data Source
AI summary
An organic light emitting display device having a sampling voltage supplying unit is disclosed. The sampling voltage supplying unit supplies a power supply voltage to a plurality of sampling latches in common depending on an output signal of a shift register. Accordingly, it is possible to significantly reduce the number of transistors in the sampling latches and reduce panel area occupied by the data driver. The reduced number of transistors of the sampling latches also reduces power consumption.