Luminance Sensor Placement in Bent Display Substrate
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Solution Overview
Problem
Existing display devices face challenges due to the need for increased wiring lines, separate control of dummy pixels, acquisition of luminance information, and the inability to provide high-precision luminance sensors, especially in narrow frame panels where space is limited and external light effects need to be considered.
Innovation Solution
A display device with a substrate having a display area and a bending area, where the bending area is bent from the display area and includes a pixel circuit with self-luminous light-emitting elements, and a luminance sensor measures the luminance of these elements in the bending area, allowing for high-precision luminance measurement and reduced external light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a luminance sensor is provided in the same plane as dummy pixels and light-emitting elements, then the panel structure can be maintained, but the precision of the luminance sensor is reduced and external light interference increases
Solution Approach 1:
The patent positions the luminance sensor in a different spatial dimension (above or below the panel plane) rather than in the same plane as the light-emitting elements. This dimensional separation allows the sensor to measure luminance without being affected by external light interference while maintaining a compact overall structure.
Solution Approach 2:
The patent introduces a light guide as an intermediary component between the light-emitting elements and the luminance sensor. The light guide redirects light from the display area to the luminance sensor positioned at a different location, enabling accurate luminance measurement while isolating the sensor from external light interference.
2Measurement precision
If the panel structure includes dummy pixels, light-emitting elements, and luminance sensor in the same area, then luminance measurement is possible, but the number of wiring lines increases and individual control of dummy pixels is required
Solution Approach 1:
The patent extracts the luminance measurement function from the display area and places it in a separate location (above or below the panel). This separation eliminates the need for dummy pixels and additional wiring lines within the display area, simplifying the overall structure while maintaining luminance measurement capability.
Solution Approach 2:
The patent makes the luminance sensor serve multiple functions: it measures luminance of the display area, compensates for image sticking, and adjusts grayscale signals. This multi-functionality eliminates the need for separate dummy pixels and control circuits, reducing wiring complexity.
3Area of stationary object
If a narrow frame panel is used, then the display area is maximized, but space for providing a luminance sensor is reduced and external light effects must be considered
Solution Approach 1:
The patent positions the luminance sensor in a different dimension (above or below the narrow frame panel) rather than within the limited planar space. This allows the sensor to be placed without reducing the display area while still enabling accurate luminance measurement free from external light interference.
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
This configuration enables the provision of a high-precision luminance sensor, reduces the impact of external light, and allows for precise measurement of the display area's luminance, thereby improving the overall performance and accuracy of the display device.
Implementation Method 1
each include a pixel circuit including a light-emitting element that is self-luminous
Implementation Method 2
the luminance sensor measures luminance of the light-emitting element in the bending area
Data Source
AI summary
A display device includes a substrate with a display area and a bending area; and a luminance sensor. The display area and the bending area each include a pixel circuit including a light-emitting element that is self-luminous. The bending area is bent from the display area. The luminance sensor measures luminance of the light-emitting element in the bending area.