Organic Electroluminescence Display Pre-Charging Signal Lines
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Solution Overview
Problem
In organic electroluminescence displays, signal interference and degradation of image quality occur due to the limited space on the substrate, leading to signal interference between data lines, which results in picture quality degradation, especially when transitioning from high brightness to low brightness images.
Innovation Solution
The implementation of a pre-charging unit that sets the signal lines to a set voltage prior to applying scanning signals, ensuring that switching blocks are conductive only when new image signals are supplied, thereby preventing residual image signals from causing unwanted light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of data lines is increased to improve resolution, then image sharpness is improved, but signal interference between lines occurs and image quality degrades
Solution Approach 1:
The display screen is divided into multiple blocks, with each block having its own set of data lines. This segmentation allows the total number of data lines to be reduced while maintaining high resolution within each block, thereby reducing signal interference between lines while preserving image sharpness.
Solution Approach 2:
Instead of increasing the number of data lines in a single dimension, the patent introduces a block structure that adds a spatial dimension to the data line organization. Multiple blocks share data lines in a time-multiplexed manner, effectively reducing the number of physical data lines needed while maintaining high resolution display capability.
2Object-affected harmful factors
If block driving method is used to reduce the number of data lines, then signal interference is reduced, but residual image signals remain on signal lines causing unwanted light emission
Solution Approach 1:
Before applying new image signals to the signal lines, the patent applies a pre-charge signal to reset the signal lines to a predetermined voltage level. This preliminary action removes any residual image signals from the previous frame, preventing unwanted light emission while maintaining the benefits of the block driving method.
Solution Approach 2:
The pre-charge signal applies a counter-action to the residual charges on the signal lines before the main image signals are applied. By resetting the voltage level in advance, the patent prevents the harmful effect of residual signals causing unwanted light emission during the block driving operation.
3Object-generated harmful factors
If pre-charging unit is added to reset signal lines, then unwanted light emission is prevented, but device complexity increases
Solution Approach 1:
The pre-charging unit shares the same data line infrastructure with the block driving unit, using the existing data lines to apply both block driving signals and pre-charge signals at different time periods. This multi-functionality approach prevents unwanted light emission without requiring completely separate dedicated pre-charge lines, thereby minimizing the increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively prevents picture quality degradation by ensuring that signal lines are reset to a lowest gray level voltage before new image signals are applied, reducing unwanted light emission and improving image clarity.
Implementation Method 1
signal interference and degradation of image quality occur due to the limited space on the substrate, leading to signal interference between data lines
Implementation Method 2
ensuring that switching blocks are conductive only when new image signals are supplied
Implementation Method 3
the organic electroluminescence display is a display device that electrically excites fluorescent organic compounds to emit light
Data Source
AI summary
An organic electroluminescence display has data, gate, and signal lines arranged on a substrate. Pixel regions are defined by the gate and signal lines. Switching elements provided in the pixel regions are electrically connected to the signal lines and the gate lines. Switching blocks open and close an electrical connection between the signal lines and the pixels. A driving unit drives the switching elements by supplying scanning signals to the gate lines. The driving unit also supplies a first control signal before the scanning signals are supplied and a second control signal when the scanning signals are supplied. The second control signal makes the switching blocks sequentially conductive, during which time image signals are supplied to the data lines. The first control signal permits the signal lines to be set at a predetermined voltage.