OLED Emission Signal Circuit for Narrow-Bezel Viewing Angle Switching
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Solution Overview
Problem
The existing viewing angle switchable OLED display devices require a non-display area for the viewing angle switchable emission signal generating part, which enlarges the non-display area and makes it difficult to achieve a narrow bezel due to the need for a shift register and additional components.
Innovation Solution
A viewing angle switchable emission signal generating part using two transistors, input and output signals of a gate signal generating part, and emission signal generating part to minimize the size of the gate driving unit and achieve a narrow bezel by generating viewing angle switchable emission signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a shift register and additional components are used to generate viewing angle switchable emission signals, then the viewing angle switching functionality is achieved, but the non-display area is enlarged and narrow bezel is difficult to obtain
Solution Approach 1:
The patent extracts and eliminates the shift register and additional components from the emission signal generating part, retaining only the essential two transistors needed for viewing angle switching. This extraction removes unnecessary elements that were consuming non-display area while preserving the core functionality of generating viewing angle switchable emission signals.
Solution Approach 2:
The simplified emission signal generating part using only two transistors is designed to perform multiple functions: generating emission signals for both wide viewing angle and narrow viewing angle modes, while also minimizing the non-display area. This multi-functional design eliminates the need for separate shift registers and additional control components.
2Area of stationary object
If the gate driving unit size is reduced to achieve narrow bezel, then the non-display area is minimized, but the complexity of generating viewing angle switchable emission signals increases
Solution Approach 1:
The patent removes unnecessary components from the gate driving unit, extracting only the essential two transistors needed for emission signal generation. This extraction simplifies the overall gate driving unit structure while maintaining the capability to generate viewing angle switchable emission signals, thereby reducing non-display area without proportionally increasing complexity.
Solution Approach 2:
Instead of adding more components to achieve viewing angle switching (the conventional approach), the patent inverts the approach by using fewer components - specifically only two transistors. This inverted design philosophy simplifies the gate driving unit while achieving the same functionality, thus reducing non-display area without excessive complexity.
Data Source
AI summary
A display device with a switchable viewing angle includes a timing controller to generate an image data, a data control signal, and a gate control signal, a data driver to generate a data signal using the image data and the data control signal, a gate driver to generate a gate signal and first to third emission signals using the gate control signal, and a display panel including a plurality of subpixels to display an image using the data signal, the gate signal, and the first to third emission signals. The gate driver includes a gate signal generator to generate the gate signal, first emission signal generator to generate the first emission signal, and second and third emission signal generators to generate the second and third emission signals, respectively, using input and output signals of the gate signal generator and input and output signals of the first emission signal generator.