TWM595864U - Light detection array device and display device - Google Patents

Abstract

A light detection array device includes a substrate, a plurality of light detection devices and a plurality of shielding devices. The light detection devices are arranged on a surface of the substrate. One of the shielding devices is disposed on one of the light detection devices, and the width of one of the shielding devices is greater than the width of one of the light detection devices.

Description

Light detection array device and display device

The present invention relates to a light detection array device and a display device, in particular to a light detection array device and a display device with a blocking element.

With the rapid development of technology, portable display devices, such as smart phones, tablet PCs, or laptop PCs, have become essential tools in people's lives. As its functions become more and more diverse, private data such as phonebooks, photos, or personal identity information are usually stored in it, which has a certain degree of privacy. To protect these data, fingerprint sensors have been developed for use in portable display devices.

In the current fingerprint sensing technology, there has been developed the feature of using light to generate total reflection in the device to achieve the effect of fingerprint image detection. However, due to the weak intensity of the totally reflected light, the effect of fingerprint image detection is easily affected by other strong light. Therefore, how to improve the effect of fingerprint image detection is still a very important issue for the application of fingerprint sensing technology.

This creation provides a light detection array device and a display device with a blocking element, which shields incident light at a small angle through the blocking element, so that the light detection element receives oblique light with a large angle of incidence, thereby improving fingerprint image detection Measured effect.

According to some embodiments, the present invention provides a light detection array device. The light detection array device includes a substrate, a plurality of light detection elements, and a plurality of shielding elements. The light detection element is disposed on a surface of the substrate. One of the plurality of blocking elements is disposed above one of the plurality of light detecting elements, and the width of one of the blocking elements is greater than the width of one of the light detecting elements.

According to some embodiments, the present invention provides a display device. The display device includes a display panel and a light detection array. The light detection array is disposed inside or outside the display panel, wherein the light detection array includes a plurality of light detection elements and a plurality of blocking elements. The light detection element is disposed on a surface of the substrate. One of the plurality of blocking elements is disposed above one of the plurality of light detecting elements, and the width of one of the blocking elements is greater than the width of one of the light detecting elements.

Those skilled in the art can understand the creation by referring to the following detailed description and at the same time combining with the attached drawings. It should be noted that in order to make it easy for the reader to understand and make the drawings concise, the drawings in this creation only depict optical detection Part of the array device and the display device, and the specific elements in the drawings are not drawn according to actual scale. In addition, the number and size of each element in the figure are only for illustration, and are not intended to limit the scope of this creation.

It should be understood that when an element or film layer is referred to as being "on" or "connected" to another element or film layer, it can be directly on or directly connected to the other element or film layer At this point, there is another element or film layer, or there is an interposed element or film layer between the two. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element or film, there are no intervening elements or layers.

It should be noted that the following embodiments can replace, recombine, and mix the technical features in several different embodiments to complete other embodiments without departing from the spirit of the present disclosure.

Please refer to FIG. 1, which is a schematic cross-sectional view of the light detection array device of the first embodiment of the invention. The light detection array device 10 may include a substrate 100, a plurality of light detection elements 102, and a plurality of blocking elements 104. The substrate 100 may include, for example, a rigid substrate or a flexible substrate. The rigid substrate may include, for example, glass, quartz, ceramic, sapphire, other materials suitable for the substrate, or a combination of the foregoing, but not limited thereto. The flexible substrate may include, for example, a plastic substrate such as a polyimide (PI) substrate, a polycarbonate (PC) substrate, a polyethylene terephthalate (PET) substrate, other suitable substrates, or Combination, but not limited to this. In addition, the substrate 100 may also include a transparent substrate or an opaque substrate, but not limited thereto.

The light detection element 102 can be disposed on a surface 1001 of the substrate 100. As shown in FIG. 1, the light detection element 102 may be disposed in the substrate 100 (eg, below the surface 1001 ), and the upper surface of the light detection element 102 may be coplanar with the surface 1001 of the substrate 100, but not limited thereto. In some embodiments, the light detection element 102 may also be disposed on the surface 1001 of the substrate 100, but it is not limited thereto. In addition, the light detection element 102 may include, for example, photodiodes, phototransistors, or other suitable light detection elements, but not limited thereto.

As shown in FIG. 1, one of the plurality of blocking elements 104 can be disposed on one of the plurality of light detecting elements 102. For example, the blocking element 1041 may be disposed above the light detection element 1021 in a normal direction N, and the normal direction N may be, for example, a direction perpendicular to the surface 1001 of the substrate 100. In this embodiment, one blocking element 104 may be provided corresponding to one light detecting element 102, but not limited to this.

As shown in FIG. 1, the light detection array device 10 may further include a transparent material layer 106 disposed on the surface 1001 of the substrate 100, wherein a plurality of blocking elements 104 may be disposed in the transparent material layer 106. The transparent material layer 106 may include suitable transparent dielectric materials such as silicon oxide, but is not limited thereto.

On the other hand, the width W1 of the blocking element 104 may be greater than the width W2 of the light detecting element 102. The width W1 and the width W2 may be, for example, the widths of the blocking element 104 and the light detecting element 102 as viewed from the normal direction N, but not limited thereto. For example, in some embodiments, the width W2 of the light detection element 102 may be approximately 20 microns, the width W1 of the blocking element 104 may be approximately 60 microns, and the distance between the light detection element 102 and the blocking element 104 D can be about 20 microns, but not limited to this.

Since the width W1 of the blocking element 104 can be greater than the width W2 of the light detecting element 102, the blocking element 104 can be used to block the light L2 with a small incident angle, which can prevent the light detecting element 102 from receiving the light L2 with a small incident angle. Moreover, the light detection element 102 can receive the light L1 with a large incident angle. The light ray L1 may be, for example, an oblique light ray, and the incident angle α of the light ray L1 may be greater than or equal to about 35° (such as 35°≦α), but not limited thereto. In some embodiments, the incident angle α of the light L1 may range from about 35° to about 75° (such as 35°≦α≦75°), but it is not limited thereto. The light ray L2 may be, for example, an oblique light ray or a normal light ray parallel to the normal direction N, and the range of the incident angle β of the light ray L2 may be less than about 35° and greater than or equal to about 0° (eg 0°≦β >35°), but not limited to this. The above-mentioned incident angle α or incident angle β may be, for example, an angle between the traveling direction of the light ray L1 or the light ray L2 and the normal direction N.

When the light detection array device 10 is used to detect oblique light with a large incident angle, the blocking element 104 can be used to shield light with a small incident angle. For example, in some cases, when the intensity of light with a large incident angle (such as light L1) is small, and the intensity of light with a small incident angle (such as light L2) is large, light can be avoided through this creation. The detection array device 10 receives light with a large incident angle and light with a small incident angle at the same time, thereby avoiding the measurement of the light detection array device 10 when it is used to detect light with a large incident angle (smaller intensity) As a result, it is disturbed by light rays with a small incident angle (larger intensity).

As shown in FIG. 1, in some embodiments, the shielding element 104 may include a single-layer structure, and the shielding element 104 may include a metal material or a light-absorbing material, where the light-absorbing material may be, for example, a black photoresist material, but not limited thereto. When the shielding element 104 is a metal material, it can reflect light with a small incident angle (such as light L2) to achieve the shielding effect. When the shielding element 104 is a light-absorbing material, it can absorb light with a small incident angle (such as light L2) to achieve the shielding effect, thereby improving the detection effect of the light detection array device 10. The light detection array device and the light detection array in the display device in the following embodiments and modified embodiments can refer to this embodiment, so the same technical features will not be repeated in the following.

Please refer to FIG. 2, which is a schematic cross-sectional view of a light detection array device of a variation of the first embodiment of the creation, and FIG. 2 depicts one of the blocking elements 1041 and one of the light detection elements 1021 as schematics . In some variant embodiments, the shielding element 104 may include a multilayer structure. For example, the blocking element 1041 may include a metal layer 104a and a light absorbing material layer 104b, wherein the light absorbing material layer 104b may be disposed between the metal layer 104a and the light detecting element 1021, but not limited thereto. The metal layer 104a located above can be used to reflect light with a small incident angle (such as light L2) to achieve the shielding effect, thereby improving the detection effect of the light detection array device 10. In addition, the light absorbing material layer 104b located below can be used to absorb light reflected from the bottom of the light detection array device 10 (such as light L3), which can prevent the light L3 from being reflected to the light detection element 1021, thereby enhancing the light detection array device 10 detection effects.

Please refer to FIG. 3, which is a schematic cross-sectional view of a display device according to a second embodiment of the invention. In some embodiments, the display device 20 may include a display panel 200 and a light detection array 202, wherein the structure and efficacy of the light detection array 202 may be the same as the first embodiment and/or its changed embodiments (see FIG. 1 The light detection array device 10 in FIG. 2) is the same, and will not be repeated here. As shown in FIG. 3, in some embodiments, the light detection array 202 may be disposed outside the display panel 200, but not limited thereto. For example, the light detection array 202 in FIG. 3 may be, for example, a plug-in type light detection array, and the light detection array 202 may be pasted to one side of the display panel 200 through an adhesive material, but not as such limit.

The display panel 200 may include a substrate 2002, a substrate 2006, and a display medium layer 2004, and the display medium layer 2004 may be disposed between the substrate 2002 and the substrate 2006, but not limited thereto. For example, when the display panel 200 is a self-luminous display panel, the display medium layer 2004 may include organic light-emitting diodes or inorganic light-emitting diodes, but not limited thereto. At this time, the light detection array 202 may be disposed below the substrate 2002 of the display panel 200 (ie, the side opposite to the light exit surface of the display panel 200), where the substrate 2002 may be, for example, a thin film transistor substrate (ie, TFT substrate), But not limited to this.

In addition, when the display panel 200 is a non-self-luminous display panel (such as a liquid crystal display panel), the display medium layer 2004 may include a liquid crystal material, but not limited thereto. At this time, the light detection array 202 may be disposed below the substrate 2002 of the display panel 200 (ie, the side opposite to the light exit surface of the display panel 200), where the substrate 2002 may be, for example, a thin film transistor substrate (ie, TFT substrate), But not limited to this. In addition, the light detection array 202 can be selectively disposed between the substrate 2002 of the display panel 200 and the backlight module (not shown), or alternatively, the light detection array 202 can be selectively disposed on the backlight module Below (ie the side opposite to the light emitting from the backlight module), but not limited to this.

In the embodiment in which the display device 20 generates the fingerprint image by detecting the totally reflected light, when the convexity of the finger 30 contacts the surface of the display device 20 (such as the surface of the substrate 2006), the light will encounter the convexity of the finger 30 Partially incident into the skin without total reflection, so the corresponding light detection element 102 (as shown in FIGS. 1 and 2) in the lower light detection array 202 can receive a small amount of corresponding light or no light. When air is included between the groove of the finger 30 and the surface of the substrate 2006, the light will be totally reflected on the surface of the substrate 2006 here, so the corresponding light detection element 102 in the lower light detection array 202 can be received Corresponding total reflection light (such as light L1), thereby, a fingerprint image can be generated.

However, due to the characteristics of the light intensity distribution of the point light source, the light that can be totally reflected has a small intensity due to a large incident angle. Furthermore, a large incident angle means that the light travels a long distance in the display device, making the light The amount absorbed by the medium increases, which in turn weakens the strength. Conversely, when the light emitted by the point light source is closer to the forward light, its intensity will be greater, and these lights can be regarded as light with a small incident angle (such as light L2) in the display device. When light with a small incident angle (such as light L2) travels within the display device to the light detection element in the light detection array below, the intensity of light L2 is greater than the intensity of light L1, which will cause the light detection element to receive The totally reflected light is severely disturbed by strong light, and thus cannot produce a fingerprint image with high contrast between light and dark.

In order to solve the above problem, when the light detection array 202 is used to detect oblique light with a large incident angle (such as light L1), the blocking element 104 (see FIGS. 1 and 2) can be used to shield light with a small incident angle (Such as light L2), thus preventing the light detection element 102 from receiving light with a large incident angle and light with a small incident angle at the same time, thereby preventing the light detection array 202 from being used to detect light (intensity) with a large incident angle When it is smaller), its measurement result is disturbed by light with a smaller incident angle (larger intensity), and it can produce a fingerprint image with high brightness and dark contrast.

Please refer to FIG. 4, which is a schematic cross-sectional view of a display device according to a third embodiment of the invention. The difference from the above embodiment is that the light detection array 302 of this embodiment can be disposed (or embedded) in the display panel 300 of a flexible organic light emitting diode, but it is not limited thereto. In the display panel 300, a substrate 304 and a substrate 306 may be, for example, flexible substrates. The flexible substrate may include, for example, a plastic substrate such as a polyimide substrate, a polycarbonate substrate, a polyethylene terephthalate substrate, or other suitable substrates. Substrate or combination thereof, but not limited to this. A plurality of thin-film transistors 308 and a plurality of organic light-emitting diodes 310 can be disposed on the substrate 304, wherein the organic light-emitting diodes 310 can be driven through the thin-film transistors 308, for example, one organic light-emitting diode 310 can be A thin film transistor 308 is electrically connected, but not limited to this.

In this embodiment, a plurality of light detection elements in the light detection array 302 can also be disposed on the substrate 304, wherein FIG. 4 depicts one of the light detection elements 3021 as an example. A multilayer packaging structure 312 may be disposed between the substrate 304 and the substrate 306. The multilayer packaging structure 312 may be used to encapsulate a plurality of organic light emitting diodes 310 on the protective substrate 304. The multi-layer packaging structure 312 may include multiple organic and/or inorganic insulating layers, but not limited thereto.

Another difference from the first embodiment is that the plurality of shielding elements in the light detection array 302 are not disposed in the transparent material layer, but are disposed on the multilayer packaging structure 312, or are disposed on the multilayer packaging structure 312 and the substrate Between 306, FIG. 4 depicts one of the blocking elements 3022 as an example. For example, the distance D between the light detecting element 3021 and the blocking element 3022 can be determined by controlling the number or thickness of the sub-film layers (not shown) in the multilayer packaging structure 312. Furthermore, like the first embodiment and its modified embodiments, the shielding element 3022 may include a single-layer structure (see FIG. 1) or a multi-layer structure (see FIG. 2). For the remaining technical features of the light detection element 3021 and the blocking element 3022, reference may be made to the first embodiment, and details are not described herein again.

In summary, in the light detection array device and the display device of the present invention, each blocking element can be correspondingly provided with a light detecting element, and the width of the blocking element can be greater than the width of the light detecting element. When the light detection array device and the display device are used to detect oblique rays with a large incident angle or totally reflected rays, the blocking element can be used to shield the rays with a small incident angle. For example, in some cases, when the intensity of light with a large incident angle (such as total reflection light) is small, and the intensity of light with a small incident angle is large, this creation can avoid the light detection element at the same time Receiving light with a large incident angle and light with a small incident angle, thereby avoiding that the light detection element is used to detect light with a large incident angle (smaller intensity), and its measurement result is affected by light with a smaller incident angle (Large intensity) interference, and can be used to detect fully reflected light to produce fingerprint images with high brightness and dark contrast.

10: Light detection array device 100,2002,2006,304,306: substrate 1001: surface 102,1021,3021: light detection element 104,1041,3022: blocking element 104a: metal layer 104b: light-absorbing material layer 106: transparent material layer 20: display device 200,300: display panel 2004: Display medium layer 202,302: light detection array 308: Thin film transistor 310: Organic light-emitting diode 312: Multi-layer packaging structure 30: finger D: distance L1, L2, L3: light N: normal direction W1, W2: width α, β: angle of incidence

FIG. 1 is a schematic cross-sectional view of a light detection array device of the first embodiment of the invention. FIG. 2 is a schematic cross-sectional view of a light detection array device according to a modified embodiment of the first embodiment. FIG. 3 is a schematic cross-sectional view of the display device of the second embodiment. FIG. 4 is a schematic cross-sectional view of the display device of the third embodiment.

10: Light detection array device

100: substrate

1001: surface

102,1021: light detection element

104,1041: blocking element

106: transparent material layer

D: distance

L1, L2: light

N: normal direction

W1, W2: width

α, β: angle of incidence

Claims (11)

A light detection array device, including: A substrate A plurality of light detection elements are provided on a surface of the substrate; and A plurality of shielding elements, wherein one of the plurality of shielding elements is disposed above one of the plurality of light detecting elements, and the width of the one of the shielding elements is greater than the The width of a light detection element. The light detection array device according to claim 1, wherein the one of the light detection elements receives an oblique light with an incident angle greater than or equal to 35°. The light detection array device according to claim 1, further comprising a transparent material layer disposed on the surface of the substrate, wherein the plurality of blocking elements are disposed in the transparent material layer. The light detection array device according to claim 1, wherein the one of the blocking elements includes a metal material. The light detection array device according to claim 1, wherein the one of the blocking elements includes a light absorbing material. The light detection array device according to claim 1, wherein the one of the blocking elements includes a metal layer and a light absorbing material layer, wherein the light absorbing material layer is disposed on the metal layer and the one of the light detection Between components. A display device, including: A display panel; and A light detection array is provided in the display panel or outside the display panel, wherein the light detection array includes: A plurality of light detection elements arranged on a surface of a substrate; and A plurality of shielding elements, wherein one of the plurality of shielding elements is disposed above one of the plurality of light detecting elements, and the width of the one of the shielding elements is greater than the The width of a light detection element. The display device according to claim 7, wherein the one of the light detection elements receives an oblique light with an incident angle greater than or equal to 35°. The display device according to claim 7, wherein the one of the blocking elements includes a metal material. The display device according to claim 7, wherein the one of the blocking elements includes a light absorbing material. The display device according to claim 7, wherein the one of the blocking elements includes a metal layer and a light absorbing material layer, wherein the light absorbing material layer is disposed between the metal layer and the one light detecting element .

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