Display Panel Photosensor Integration Aperture Ratio
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Solution Overview
Problem
In liquid crystal displays, integrating photosensitive sensors for fingerprint recognition challenges the pixel aperture ratio and optical path adjustment due to the need for additional wiring space and the long distance between sensors and black matrix openings, affecting resolution and accuracy.
Innovation Solution
A display panel design with photosensitive sensors and light transmitting holes on the array substrate, along with a light-shielding layer and collimation film, ensures a high pixel aperture ratio and precise optical path alignment, enhancing resolution and accuracy by reducing the width of the black matrix and optimizing the placement of photosensitive sensors and light transmitting holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If photosensitive sensors are integrated into the array substrate for fingerprint recognition, then fingerprint recognition function is added, but the pixel aperture ratio is reduced and optical path adjustment becomes difficult
Solution Approach 1:
The patent merges the photosensitive sensor with the array substrate by disposing the sensor on the same substrate, allowing the sensor to share the same mounting area as the pixel electrodes. This integration enables fingerprint recognition functionality while minimizing the impact on pixel aperture ratio by utilizing existing substrate space rather than adding separate mounting areas.
Solution Approach 2:
The patent introduces light transmitting holes through the array substrate at positions corresponding to the photosensitive sensor, creating a new dimensional pathway for light to reach the sensor. This vertical dimension (through the substrate thickness) allows optical path adjustment without compromising the horizontal pixel aperture ratio, as light can pass through the substrate to reach the sensor from the backlight.
2Adaptability or versatility
If photosensitive sensors are placed on the array substrate, then fingerprint recognition is enabled, but the distance between sensors and black matrix openings becomes long, affecting resolution
Solution Approach 1:
The patent performs preliminary action by pre-positioning the light transmitting holes at specific locations on the array substrate before final assembly. These holes are disposed at positions corresponding to the photosensitive sensor, ensuring that the optical path is pre-established and aligned correctly. This preliminary positioning eliminates the need for complex post-assembly alignment and ensures precise optical path alignment between the sensor and the light source.
Solution Approach 2:
The light transmitting holes act as intermediaries between the backlight and the photosensitive sensor. These holes serve as optical mediators that channel light from the backlight through the array substrate to the sensor, compensating for the long distance between the sensor and the black matrix openings. The intermediaries (light transmitting holes) enable precise optical coupling despite the spatial separation, thereby maintaining resolution accuracy.
3Measurement precision
If the black matrix width is reduced to improve pixel aperture ratio, then more light reaches the sensor, but the structural stability of the array substrate is compromised
Solution Approach 1:
The patent applies local quality by making the black matrix width variable rather than uniform. The black matrix has different widths in different regions: it is wider in areas where structural support is needed and narrower in areas where light transmission is prioritized. This localized variation allows the black matrix to maintain structural stability where required while improving pixel aperture ratio where the photosensitive sensor is located, as the matrix can be thinned without compromising overall structural integrity.
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 design maintains a high pixel aperture ratio, improves optical path adjustment, and increases the resolution of photosensitive sensors, effectively addressing the challenges of integrating fingerprint recognition in liquid crystal displays.
Implementation Method 1
a collimation film arranged between the light-shielding layer and the array substrate, wherein the collimation film includes a collimation hole array, and the collimation holes are the second light transmitting holes
Implementation Method 2
optimizing the placement of photosensitive sensors and light transmitting holes... improves optical path adjustment
Implementation Method 3
The optical sensors are mainly based on photosensitive sensors, which realize fingerprint recognition by detecting a difference in light reflection between valleys and ridges
Data Source
AI summary
Disclosed are a display panel and a display apparatus. The display panel includes an opposing substrate, an array substrate and a liquid crystal layer. The array substrate includes: a first base substrate; a color film layer, includes a black matrix and a plurality of color resistors, the black matrix includes a plurality of pixel openings and a plurality of first light transmitting holes, and color resistors is arranged one pixel opening correspondingly; and photosensitive sensors, arranged between the color film layer and the first base substrate, orthographic projections of the plurality of photosensitive sensors on the first base substrate are in an orthographic projection of the black matrix on the first base substrate, and the orthographic projection of each of the plurality of photosensitive sensors on the first base substrate covers an orthographic projection of at least one the plurality of first light transmitting holes on the first base substrate.