Display Device Light Receiving Sensor Spatial Frequency Masking
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Solution Overview
Problem
Display devices with integrated light receiving circuits face a challenge in maintaining display quality when the light receiving resolution is lower than the display resolution, leading to a sense of incompatibility and potential issues in display quality due to reduced light transmittance and unnecessary high light receiving resolution requirements.
Innovation Solution
The display device and information processing apparatus incorporate a design where the light receiving circuit region is made a dark portion and the display circuit region is made a light portion, with a spatial frequency of repetitive patterns of light and dark portions set to at least 10 cpd, ensuring that the display quality is maintained even with a lower light receiving resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of light receiving circuits is reduced to lower light receiving resolution, then device complexity and manufacturing cost are reduced, but display quality deteriorates due to visible streaks and sense of incompatibility
Solution Approach 1:
The patent applies local quality by making the light receiving circuit regions have different optical properties (dark portions) compared to the display circuit regions (light portions). This creates spatial variation in the display panel that masks the lower resolution of the light receiving circuits while maintaining their functional capability.
Solution Approach 2:
The patent changes the spatial frequency parameter of the repetitive pattern of light and dark portions to be equal to or higher than 10 cpd. This parameter change ensures that the pattern is perceived as uniform by the human eye, masking the lower light receiving resolution and preventing visible streaks.
2Device complexity
If light receiving circuits are disposed on the same substrate as display circuit, then integration and compactness are improved, but light transmittance decreases in regions with light receiving circuits
Solution Approach 1:
The patent creates local quality differences by designating specific regions as dark portions (light receiving circuits) and others as light portions (display circuits). This allows the integrated structure to function properly while the dark portions mask the reduced light transmittance areas.
Solution Approach 2:
The patent converts the harmful effect of reduced light transmittance in light receiving circuit regions into a beneficial feature by using these dark portions as part of the visual pattern. The reduced transmittance areas become intentional design elements that mask their own negative impact through the high spatial frequency repetition.
3Productivity
If light receiving resolution is made lower than display resolution, then productivity and manufacturing simplicity are improved, but measurement precision of light detection is worsened
Solution Approach 1:
The patent changes the spatial frequency parameter to be equal to or higher than 10 cpd, which transforms the perception of the lower resolution light receiving circuits. This parameter change allows the system to maintain manufacturing simplicity while achieving adequate functional performance through human visual system characteristics.
Solution Approach 2:
The patent uses the human visual system as an intermediary that interprets the high spatial frequency pattern as uniform, thereby masking the lower light receiving resolution. The visual perception acts as a mediator between the physical lower resolution and the perceived adequate quality.
Data Source
AI summary
A display device having at least a display circuit for displaying an image, and a light receiving sensor for detecting a light disposed is provided. When a light receiving circuit region including the light receiving sensor is made a dark portion, and a region other than the light receiving circuit region is made a light portion, the display circuit and the light receiving sensor are disposed so that a spatial frequency of a repetitive pattern of the light portions and the dark portions becomes equal to or higher than 10 cpd.