Sensing element substrate and display device including same

Abstract

The invention provides a sensing element substrate and a display device comprising the same. The sensing element substrate includes a substrate and a sensing element. The sensing element is located on the substrate and comprises a first electrode, a second electrode, a sensing layer, a conductive layer and a first insulating layer. The first electrode is located on the substrate. The second electrode overlaps the first electrode. The sensing layer is located between the second electrode and the first electrode. The conductive layer overlaps the second electrode and is electrically connected to the first electrode. The conductive layer has a first opening which overlaps the sensing layer. The first insulating layer is located between the conductive layer and the second electrode.

Description

technical field [0001] The present invention relates to a sensing element substrate, in particular to a display device including the sensing element substrate. Background technique [0002] The development of display devices is changing with each passing day, especially the full-screen design has become the mainstream of small and medium-sized screen specifications. In order to achieve a full screen, the fingerprint recognition function is integrated into the screen display iFP (in-cell Fingerprint Sensing) is its key technology, and the full-screen non-fixed-point fingerprint recognition function is expected to support a variety of applications, improving user experience and Increase the added value of the panel, for the current key development projects. [0003] In terms of practical application requirements, iFP needs to be equipped with a light collimation design to overcome the interference of reflected light from adjacent peaks / valleys of fingerprints caused by the th...

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Problems solved by technology

However, the optical collimation design needs to limit the light-receiving area of ​​the sensing element, resulting in a decrease in the photocurrent (Iph), resulting in a similar light / dark current value, that is, an insufficient light / dark current ratio, which in turn affects the fingerprint image contrast quality

If the non-illuminated area of ​​the sensing element is reduced to reduce the dark current, the capacitance of the sensing element will decrease, resulting in poor circuit coupling efficiency under the action of the active photosensitive circuit, resulting in low output voltage of the fingerprint and compression of the peak of the fingerprint / Grain and valley contrast, which will also reduce the contrast quality of the fingerprint image

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