Scanning Display Light Emitter Architecture with Rotatable Mirror
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Solution Overview
Problem
Conventional full-color display devices require a large number of lines to connect light emitters, leading to increased complexity and higher driving current requirements for high-resolution displays, especially when using direct addressing methods.
Innovation Solution
A scanning-type display device with multiple rows and columns of light emitters that operate in an active matrix configuration, utilizing a rotatable mirror to project light to different areas of an image field, and a data shift technique to synchronize the operation of light emitters, reducing the number of signal lines and increasing brightness by illuminating pixels with multiple emitters of the same color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If direct addressing method is used to control light emitters, then each light emitter can be controlled independently, but the number of signal lines required increases significantly
Solution Approach 1:
The display device segments light emitters into multiple rows, with each row controlled by a shared scan signal. This segmentation allows independent control of rows while reducing the number of data lines needed, as each row's light emitters are addressed sequentially rather than requiring individual dedicated lines for each emitter
Solution Approach 2:
The scan signal serves multiple functions by being shared across all light emitters in a row. This universal signal controls the timing and selection of multiple emitters simultaneously, reducing the overall number of control lines required while maintaining independent control capability
2Device complexity
If multiplexing signals are used to reduce the number of lines, then the number of signal lines is reduced, but the frequency and driving current for each light emitter must be multiple times higher
Solution Approach 1:
The system uses periodic scanning where rows are selected sequentially at regular time intervals. This periodic action allows the use of lower driving currents and frequencies for each individual light emitter, as each emitter is activated in periodic bursts rather than requiring continuously high power levels
Solution Approach 2:
The multiplexed scanning system maintains continuous display output by rapidly switching between rows in a continuous cycle. This continuous scanning creates the perception of steady illumination while actually using lower instantaneous power levels, reducing the overall power requirement compared to driving all emitters simultaneously at high current
3Device complexity
If light emitters operate for only a portion of the frame period, then the number of lines can be reduced, but the brightness of each light emitter decreases
Solution Approach 1:
The patent merges the output of multiple light emitters that illuminate the same pixel at different times. By combining the light output from several emitters sequentially activated during the frame period, the system achieves higher overall brightness at the pixel level while each individual emitter operates for only a portion of the frame period
Solution Approach 2:
The system performs preliminary selection of rows using scan signals before data is transferred to the selected row's light emitters. This preliminary action allows the data bus to be reused for subsequent rows, reducing the number of data lines needed while maintaining sufficient brightness through the sequential activation of multiple emitters per pixel
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
The solution reduces the complexity of signal lines and increases brightness by allowing multiple light emitters to contribute to the same pixel, achieving efficient and high-brightness image formation with reduced power consumption.
Implementation Method 1
A rotatable mirror projects emitted light to an image field. As the mirror rotates, light is projected to different areas of the image field.
Data Source
AI summary
A scanning type display device includes a light source that includes multiple rows and columns of light emitters. The display device also includes a rotatable mirror that projects light to different areas of an image field as the mirror rotates. There can be a redundant number to light emitters in the light source to increase the brightness of the pixels in the image field. A data driver may replicate and shift data values among light emitters of the same columns. The light emitters may operate in conjunction with the mirror in a synchronized manner. Owing to the shift in data value and the rotation of the mirror, the mirror may first project light from a first light emitter to a pixel and may then project light from a second light emitter with the same brightness level to the same pixel. The shifting may continue for additional light emitters.