Level Shifter Circuit for Narrow and Wide Viewing Angle Displays
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Solution Overview
Problem
Existing display devices struggle with efficiently controlling variable viewing angles for different screen areas, particularly in vehicle displays where specific and shared content needs to be displayed to different users within narrow and wide viewing angles, respectively.
Innovation Solution
A level shifter and display device design that includes a first logic circuit to receive a mode selection signal of a first voltage level for selectively driving first and second light-emitting elements, and a second logic circuit to convert this signal into a higher voltage level for outputting to the pixel circuit, allowing for simple structure mode selection signal application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a level shifter with voltage conversion is used to control mode selection signals, then the pixel circuit can be driven with appropriate voltage levels for different viewing angles, but the device complexity increases due to additional logic circuits
Solution Approach 1:
The patent applies parameter changes by converting the voltage level of mode selection signals from a first voltage level to a second voltage level using a level shifter. This voltage parameter transformation enables the pixel circuit to properly respond to mode selection signals that control different viewing angle modes (narrow vs. wide), resolving the contradiction between adaptability and device complexity by using a standard voltage conversion approach rather than more complex control mechanisms
2Adaptability or versatility
If multiple light-emitting elements with different viewing angles are integrated into each pixel circuit, then variable viewing angle functionality is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies segmentation by dividing each pixel into multiple light-emitting elements (first light-emitting element for narrow viewing angle and second light-emitting element for wide viewing angle). Each element can be independently controlled through mode selection signals, enabling variable viewing angle functionality. This segmentation approach allows for standardized manufacturing processes for each element type while achieving complex overall functionality, thus resolving the contradiction between adaptability and manufacturing precision
Data Source
AI summary
A level shifter according to an embodiment and a display device including the same are disclosed. A level shifter includes a first logic circuit configured to receive a mode selection signal of a first voltage level for selectively driving first and second light-emitting elements that emit light at different viewing angles of a pixel circuit from a timing controller and transmit the mode selection signal; and a second logic circuit configured to convert the mode selection signal of the first voltage level into a mode selection signal of a second voltage level higher than the first voltage level and output the converted mode selection signal of the second voltage level to the pixel circuit.