Inclined Reflecting Electrode Viewing Angle Control
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Solution Overview
Problem
Small-sized display devices, such as those used in head-mounted displays and electronic viewfinders, face challenges in achieving improved viewing angle characteristics due to the need for a simpler optical system configuration, which complicates the supplementation of viewing angle characteristics directly, leading to reduced display quality.
Innovation Solution
A display device with a configuration where a luminescence layer is sandwiched by a first electrode functioning as a reflecting electrode and a second electrode, with the surface of the first electrode inclined from a plane perpendicular to the stacking direction in at least a partial region of the display surface, allowing for controlled main emission directions and adjusted viewing angle characteristics on a pixel basis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the optical system is downsized to reduce weight and size of the electronic apparatus, then the weight and size are reduced, but it becomes difficult to supplement the viewing angle characteristics of the display device
Solution Approach 1:
The patent applies local quality by creating regions with different first electrode inclination directions within the display surface. Specifically, a first region has a first inclination direction while a second region has a second inclination direction different from the first. This spatial variation in electrode orientation allows different portions of the display to emit light in preferential directions, thereby achieving wide viewing angle characteristics without requiring a complex optical system.
Solution Approach 2:
The patent introduces a new dimension of control by inclining the first electrode surface from the perpendicular direction to the stacking direction. Instead of controlling light emission solely through the optical system, the invention tilts the reflecting electrode surface to redirect light paths. This dimensional change in electrode orientation provides an additional degree of freedom for controlling viewing angle characteristics.
2Device complexity
If the optical system configuration is simplified to reduce complexity, then the device complexity is reduced, but it becomes difficult to achieve improved viewing angle characteristics
Solution Approach 1:
The patent applies local quality by creating regions with different first electrode inclination directions within the display surface. Specifically, a first region has a first inclination direction while a second region has a second inclination direction different from the first. This spatial variation in electrode orientation allows different portions of the display to emit light in preferential directions, thereby achieving wide viewing angle characteristics without requiring a complex optical system.
Solution Approach 2:
The patent replaces the mechanical/optical system (lenses, mirrors, diffraction gratings) with an electrical/structural solution by inclining the first electrode surface. Instead of using complex optical components to control light direction, the invention tilts the reflecting electrode surface to redirect light paths, thereby simplifying the overall device configuration while maintaining viewing angle performance.
3Ease of manufacture
If conventional flat electrode configuration is used, then manufacturing is simpler, but viewing angle characteristics are insufficient for small-sized display devices
Solution Approach 1:
The patent applies local quality by creating regions with different first electrode inclination directions within the display surface. Specifically, a first region has a first inclination direction while a second region has a second inclination direction different from the first. This spatial variation in electrode orientation allows different portions of the display to emit light in preferential directions, thereby achieving wide viewing angle characteristics without requiring a complex optical system.
Solution Approach 2:
The patent changes the geometric parameter of the first electrode by inclining its surface from the perpendicular direction to the stacking direction. This parameter change (tilt angle) is applied differently in different regions to achieve desired viewing angle characteristics. The inclination allows the electrode to redirect light paths while maintaining ease of manufacture through standard thin-film deposition techniques.
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 enhances viewing angle characteristics without reducing luminance or protectiveness, allowing for higher quality displays in small-sized devices by distributing the inclination of the first electrode across the display surface, thereby improving the display's performance in various usage scenarios.
Implementation Method 1
a first electrode functioning as a reflecting electrode
Data Source
AI summary
[Object] To make it possible to improve viewing angle characteristics more.[Solution] Provided is a display device including: a plurality of light emitting sections formed on a substrate. The light emitting section has a configuration in which a luminescence layer is sandwiched by a first electrode functioning as a reflecting electrode and a second electrode in a stacking direction, a surface of the first electrode facing the luminescence layer is inclined from a plane perpendicular to the stacking direction in at least a partial region in a display surface, and an inclination direction of the first electrode has a distribution in the display surface.