Light Emitting Apparatus Pixel Circuit Initialization
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Solution Overview
Problem
Existing light emitting apparatus configurations are complex and inefficient, particularly in initialization and compensation operations, which complicate the setup and reduce the time available for writing data voltages, leading to potential image contrast deterioration.
Innovation Solution
A light emitting apparatus with a simplified configuration that includes scan lines, data lines, and pixel circuits, where a driving circuit controls the selection and reset transistors to perform initialization and compensation operations before the selection period, allowing for a sufficient time period for writing data voltages and reducing the number of signal lines and transistors needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of signal lines and transistors are provided to perform initialization or compensation operation, then the initialization and compensation operations can be performed, but the configuration becomes complicated
Solution Approach 1:
The data lines are made to serve dual purposes: they function as both data transmission lines and as signal lines for supplying initialization and compensation signals to the pixel circuits. This multi-functionality eliminates the need for separate dedicated signal lines, thereby simplifying the overall configuration while maintaining the necessary initialization and compensation operations
Solution Approach 2:
The patent merges the function of data lines with the function of control signal lines. By combining these functions into a single set of lines, the number of separate components is reduced, simplifying the configuration without compromising the ability to perform initialization and compensation operations
2Device complexity
If the data lines are also used as the signal lines for supplying signals used for the initialization or compensation operation, then the number of the signal lines or the number of the transistors can be reduced, but the time period for writing the data voltage becomes insufficient
Solution Approach 1:
The initialization and compensation operations are performed in advance during the horizontal scan time period before the actual data writing operation begins. By completing these preparatory operations beforehand, the patent ensures that the subsequent data writing phase has sufficient time without interference, thus resolving the time conflict
Solution Approach 2:
The horizontal scan time period is divided into distinct phases: an initialization period, a compensation period, and a data writing period. This temporal segmentation allows each operation to occur in its designated time slot, ensuring that initialization and compensation do not encroach on the time available for data writing
3Device complexity
If the reference voltage and the data voltage are time-divisionally supplied to the data line in one horizontal scan time period, then the number of signal lines can be reduced, but it becomes difficult to secure a sufficient time period for writing the data voltage
Solution Approach 1:
Initialization and compensation signals are supplied in advance during the horizontal scan time period before data writing begins. This preliminary action ensures that when data writing starts, the pixel circuits are already prepared and no time needs to be spent on these operations during the data writing phase, thus maintaining high productivity
Solution Approach 2:
The horizontal scan time period is segmented into distinct operational phases: initialization period, compensation period, and data writing period. This temporal segmentation allows each function to occur in its own time slot without interfering with others, ensuring sufficient time for data writing while using the same data lines for multiple purposes
Data Source
AI summary
Provided is a light emitting apparatus where each pixel circuit is provided with the reset transistor, which is disposed between the node of the pixel circuit and the first feed line corresponding to the adjacent pixel circuit in the second direction as viewed from the pixel circuit. In addition, in the initialization period before the selection period, in which the scan line corresponding to the pixel circuit is selected, and in the compensation period, the reset transistor of the pixel circuit is set to the ON state, and the values of the power supply voltages output to the first feed line corresponding to the pixel circuit and the first feed line corresponding to the adjacent pixel circuit in the second direction as viewed from the pixel circuit are variably controlled, so that the initialization or compensation operation of the pixel circuit is performed.