Display Device Segmented Pixels Narrow Viewing Angle Power
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Solution Overview
Problem
Display devices operating in narrow viewing angle mode experience increased power consumption due to unnecessary gate-on signals and data load from converting pixels to black images, which complicates the black image conversion process.
Innovation Solution
The implementation of a display device with distinct pixel types, where a first pixel emits light in wide viewing angle mode but not in narrow viewing angle mode, and a second pixel emits light in both modes, with specific gate and data line connections to manage gate-on and data-off signals, reducing power consumption and data load by controlling light emission based on viewing angle mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixels are driven to display black image in narrow viewing angle mode, then unauthorized viewing is prevented, but power consumption increases
Solution Approach 1:
The patent segments pixels into two distinct types: first pixels that emit light only in wide viewing angle mode and second pixels that emit light in both wide and narrow viewing angle modes. This segmentation allows selective activation of only the necessary pixel types in narrow viewing angle mode, preventing unauthorized viewing while minimizing power consumption by avoiding activation of unnecessary first pixels.
Solution Approach 2:
Different regions of the display panel are assigned different pixel characteristics - areas requiring narrow viewing angle protection use second pixels, while other areas use first pixels. This local differentiation enables the system to optimize power consumption locally, activating only the pixel types needed for each specific viewing angle requirement.
2Reliability
If data of some pixels is converted to black image, then unauthorized viewing is prevented, but data load increases
Solution Approach 1:
By segmenting pixels into first and second types with different viewing angle characteristics, the patent eliminates the need for black image conversion for first pixels in narrow viewing angle mode. Only second pixels require data conversion, significantly reducing the overall data processing load while maintaining the security function.
Solution Approach 2:
The patent extracts the black image conversion operation from the general pixel data processing stream. By using second pixels with inherent narrow viewing angle characteristics, the system removes the need to convert first pixel data to black images, thereby eliminating unnecessary data processing steps.
3Adaptability or versatility
If gate-on signal is output to all gate lines, then all pixels can display, but unnecessary power consumption occurs in narrow viewing angle mode
Solution Approach 1:
Gate lines are segmented into first gate lines connected to first pixels and second gate lines connected to second pixels. In narrow viewing angle mode, the gate driver selectively outputs gate-on signals only to second gate lines, excluding first gate lines. This segmentation-based selection enables the system to maintain display coverage for authorized viewing while preventing power consumption from unnecessary first pixel activation.
Data Source
AI summary
A display device includes a display panel including a gate line, a data line, and a pixel electrically connected to the gate line and the data line and that displays an image based on input image data, a gate driver which outputs a gate signal to the gate line, a data driver which outputs a data voltage to the data line, and a driving controller which controls the gate driver and the data driver. The pixel includes a first pixel that emits light in a first mode and does not emit light in a second mode and a second pixel that emits light in both the first mode and the second mode, where the second pixel has a narrower viewing angle than the first pixel. The gate line includes a first gate line connected only to the first pixel and a second gate line connected only to the second pixel.