Display Device Selector Circuit Alternating Signal Distribution
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Solution Overview
Problem
In display devices using micro organic light emitting diodes (M-OLEDs), the demultiplexer circuit causes signal interference between adjacent pixels, leading to streak-like luminance issues and image deterioration due to the sequential operation of selector circuits, which affects the voltage values and input signal variations across the display panel.
Innovation Solution
A display device design that includes a selector circuit which time-divides and distributes light emission signals to pixels in alternating orders across adjacent pixel lines, using a line control circuit to manage light emission and reduce interference by controlling the selection order of pixels, thereby minimizing luminance and color tone variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of selectors in the demultiplexer circuit is increased to reduce the number of amplifiers, then circuit scale is reduced, but the time for selecting one signal line decreases causing signal interference and image deterioration
Solution Approach 1:
The patent applies preliminary action by pre-setting the selection order of pixel columns in the demultiplexer circuit to alternate between ascending and descending orders for adjacent pixel lines. This predetermined alternating pattern prevents signal interference before it occurs, ensuring that pixels in adjacent lines are selected in opposite sequences, thereby canceling out the influence of signal propagation delays and preventing streak-like luminance issues.
2Device complexity
If the selector circuit operates sequentially from one end to the other, then the circuit structure is simple, but signal values vary across pixels causing voltage variations and image deterioration
Solution Approach 1:
The patent applies dynamics by making the selection order dynamic and adaptable based on the pixel line position. The demultiplexer circuit automatically switches between ascending and descending selection orders depending on whether the pixel line is odd or even numbered. This dynamic adjustment compensates for the sequential operation limitation, ensuring consistent signal values across all pixels while maintaining a relatively simple circuit structure.
3Reliability
If pixel selection order is changed to reduce influence from adjacent pixels, then signal interference is reduced, but further suppression of image deterioration is needed
Solution Approach 1:
The patent applies periodic action by implementing a regular alternating pattern in the pixel column selection order. The demultiplexer circuit systematically switches between ascending and descending selection orders in a periodic manner for consecutive pixel lines. This periodic alternation creates a predictable pattern that consistently reduces signal interference from adjacent pixels, thereby suppressing image deterioration and improving overall image quality.
Data Source
AI summary
Deterioration of an image is suppressed. A display device includes: pixels including a plurality of light emitting units that emits light of each of a plurality of colors; a pixel array in which the pixels are arranged in an array of pixel lines along a line in a first direction and pixel columns along a column in a second direction intersecting the first direction; a signal line connected to the pixels belonging to the pixel array in the second direction; and a selector circuit connected between a predetermined number of the pixel columns and the signal line. The signal line applies, via the selector circuit, a light emission signal provided in time series to the light emitting units of each color of the pixels, the selector circuit time-divides the light emission signal provided in time series from the signal line into the predetermined number of columns, the light emission signal is distributed to the pixels in the same order for each color in the same order in the same pixel line, and the light emission signal is distributed to the pixels in different orders for each line for each color in the same order in two adjacent pixel lines.