CN111956236B

CN111956236B - Display device

Info

Publication number: CN111956236B
Application number: CN202010884755.8A
Authority: CN
Inventors: 周昱恒
Original assignee: Interface Optoelectronics Shenzhen Co Ltd; Interface Technology Chengdu Co Ltd; General Interface Solution Ltd
Current assignee: Interface Optoelectronics Shenzhen Co Ltd; Interface Technology Chengdu Co Ltd; General Interface Solution Ltd
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2023-04-21
Anticipated expiration: 2040-08-28
Also published as: TW202208959A; TWI741780B; CN111956236A

Abstract

A display device includes a display panel, a photosensitive element, a resonant waveguide optical element, and a sensing light source. The display panel includes a color filter. The color filter has a filter region and a black matrix region surrounding the filter region. The resonant waveguide optical element is arranged in the black matrix area and is provided with a plurality of gratings. The photosensitive element is disposed in alignment with the resonant waveguide optical element. The grating of the resonant waveguide optical element is located on a side of the resonant waveguide optical element opposite the photosensitive element. The sensing light source is arranged to emit a sensing light beam towards the object to be measured. The sensing light beam is reflected by the object to be detected and is received by the photosensitive element through the resonant waveguide optical element. Thus, display and blood glucose detection can be realized.

Description

Display device

Technical Field

The present disclosure relates to a display device.

Background

Blood glucose detection is a modern and important health monitoring means. The current blood glucose detection method is mainly wound blood glucose detection. Patients need to bear the pain caused by needle insertion, and after the blood flows out, the collected blood is put into a detection instrument to obtain the relevant data of blood sugar.

To improve the traumatic blood glucose detection, some non-invasive blood glucose detection methods have been proposed, which include a sensing method combined with near infrared optical technology, wherein the principle is to use the reflection of near infrared light to the patient's skin, and read the blood glucose value from the reflected light intensity change. These non-invasive blood glucose tests often require specific equipment and are somewhat inconvenient to use. Therefore, how to effectively combine the non-invasive blood glucose detection technology to a mobile device so as to conveniently realize blood glucose detection is one of the problems to be solved by those skilled in the art.

Disclosure of Invention

To achieve the above object, the present disclosure provides a display device.

According to one embodiment of the present disclosure, a display device includes a display panel, a photosensitive element, a sensing light source, and a resonant waveguide optical element. The display panel comprises a detection area and a color filter. The color filter has a filter region in the detection region and a black matrix region surrounding the filter region. The resonant waveguide optical element is arranged in the black matrix area and is provided with a plurality of gratings. The photosensitive element is disposed in alignment with the resonant waveguide optical element. The grating of the resonant waveguide optical element is located on a side of the resonant waveguide optical element opposite the photosensitive element. The sensing light source is arranged to emit a sensing light beam towards the object to be measured. The sensing light beam is reflected by the object to be detected and is received by the photosensitive element through the resonant waveguide optical element.

In some embodiments, the color filter further has a pixel region. At least one of the pixel regions is disposed in the detection region.

In one or more embodiments, the photosensitive element further comprises an interleaved dielectric structure. The grating is located on the staggered dielectric structure. The staggered dielectric structure is provided with one or more first dielectric layers and one or more second dielectric layers which are staggered and stacked with each other. The first dielectric layer uses a different material than the one or more second dielectric layers.

In some embodiments, the total number of layers of the first dielectric layer and the second dielectric layer is between two and seven layers.

In some embodiments, the total number of layers of the first dielectric layer and the second dielectric layer is two. The resonant waveguide optical element has a transmittance peak in a first wavelength range of 1500nm to 1700nm, the half-width of the transmittance peak being greater than 50nm.

In some embodiments, the one or more first dielectric layers of the staggered dielectric structure further comprise a base layer. The thickness of the basal layer is larger than the thickness of any one of the other first dielectric layers and the second dielectric layers. The substrate layer is positioned on a second side of the staggered dielectric structure opposite the grating.

In some embodiments, the one or more first dielectric layers other than the base layer have the same thickness. The second dielectric layers have the same thickness.

In some embodiments, the gratings are arranged parallel to each other on the staggered dielectric structure.

In one or more embodiments, the photosensitive element of the display structure is a thin film transistor sensor disposed in alignment with the resonant waveguide optical element.

In one or more embodiments, the display device as described above further includes a buffer film layer. The buffer film layer fills between the resonant waveguide optical element and a protective cover plate located on the color filter.

In some embodiments, the display panel further includes a liquid crystal alignment film. The liquid crystal alignment film is positioned between the liquid crystal layer and the color filter. The resonant waveguide optical element is arranged on the liquid crystal alignment film and covered by the buffer film layer.

In one or more embodiments, the sensing light source is a near infrared light source. The near-infrared light source comprises a near-infrared light emitting diode light source with the width larger than that of the resonant waveguide optical element and arranged below the resonant waveguide optical element, or two near-infrared light bars arranged at two opposite edges of the display device.

In summary, the display device disclosed by the invention integrates the display panel, the sensing light source, the photosensitive element and the resonant waveguide optical element, so that the effect of blood glucose detection can be realized. The display device disclosed by the invention can be applied to mobile devices such as mobile phones and the like, so that the blood glucose detection function can be conveniently realized.

The above description is merely illustrative of the problems, means for solving the problems, and efficacy of the products produced by the present disclosure, and the details of this disclosure are set forth in the following description and related drawings.

Drawings

The advantages and drawings of the present disclosure should be better understood from the following detailed description of the embodiments with reference to the drawings. The description of these drawings is merely illustrative of embodiments and is not therefore to be construed as limiting the individual embodiments or the scope of the invention as claimed.

FIG. 1 illustrates a schematic top view of a display device disposed on a mobile device according to one embodiment of the present disclosure;

FIG. 2 illustrates a schematic cross-sectional view of the display device of FIG. 1 according to one embodiment of the present disclosure;

FIG. 3A schematically illustrates an arrangement of sensing light sources according to one embodiment of the disclosure;

FIG. 3B schematically illustrates an arrangement of sensing light sources according to another embodiment of the present disclosure;

FIG. 4 schematically illustrates a perspective view of an optical element disposed in a resonant waveguide according to one embodiment of the present disclosure;

FIG. 5A schematically illustrates a cross-sectional view of an optical element disposed in a resonant waveguide according to one embodiment of the present disclosure;

FIG. 5B shows the transmittance of the resonant waveguide optical device of FIG. 5A for different wavelengths;

FIG. 6A schematically illustrates a cross-sectional view of an optical element disposed in a resonant waveguide according to another embodiment of the present disclosure;

FIG. 6B shows the transmittance of the resonant waveguide optical device of FIG. 6A for different wavelengths;

FIG. 7A schematically illustrates a cross-sectional view of an optical element disposed in a resonant waveguide according to another embodiment of the present disclosure;

FIG. 7B shows the transmittance of the resonant waveguide optical device of FIG. 7A for different wavelengths;

FIG. 8A schematically illustrates a cross-sectional view of an optical element disposed in a resonant waveguide according to another embodiment of the present disclosure;

FIG. 8B shows the transmittance of the resonant waveguide optical device of FIG. 8A for different wavelengths;

FIG. 9A schematically illustrates a cross-sectional view of an optical element disposed in a resonant waveguide according to another embodiment of the present disclosure;

FIG. 9B shows the transmittance of the resonant waveguide optical device of FIG. 9A for different wavelengths;

FIG. 10A schematically illustrates a cross-sectional view of an optical element disposed in a resonant waveguide according to another embodiment of the present disclosure; and

FIG. 10B shows the transmittance of the resonant waveguide optical device of FIG. 10A for different wavelengths.

Reference numerals:

100 display device 110 display panel

113 backlight module 116 transparent substrate

119 pixel electrode 120 common electrode

122 liquid crystal layer 123 liquid crystal

125 liquid crystal alignment film 127 color filter

128 black matrix region 131 filter region

134, protective cover 140, thin film transistor

150 resonant waveguide optical element 152 grating

155 staggered dielectric structure 160 first dielectric layer

161 substrate layer 163 second dielectric layer

170 sensing light source 180 buffer film layer

200,200': mobile device 300: object to be measured

W is width T is thickness

P: cycle length SR: detection zone

HB, H1, H2 thickness

Detailed Description

The following detailed description of the embodiments is provided in connection with the accompanying drawings, but the embodiments are not intended to limit the scope of the disclosure, and the description of the operation of the structures is not intended to limit the order in which they may be performed, as any device with equivalent performance resulting from a re-combination of elements is intended to be encompassed by the disclosure. In addition, the drawings are for illustrative purposes only and are not drawn to scale. For ease of understanding, the same or similar elements will be indicated by the same reference numerals in the following description.

Furthermore, the terms (terms) used throughout the specification and claims have the ordinary meaning in the art, throughout the disclosure and in the specific text, unless otherwise indicated. Certain terms used to describe the disclosure are discussed below, or elsewhere in this specification, to provide additional guidance to those skilled in the art in light of the description of the disclosure.

Herein, the terms "first," "second," and the like are used merely to distinguish between components or methods of operation having the same technical term, and are not intended to represent a sequence or to limit the present disclosure.

In addition, the terms "comprising," "including," "providing," and the like are intended to be open-ended, and are intended to include, but not be limited to.

Further, herein, unless the context specifically defines the article, "a" and "an" may refer to one or more than one. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including" when used herein, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.

In order to achieve the function of conveniently detecting blood sugar, the disclosure provides a display device. The display device can be used on a mobile device such as a mobile phone, and has both touch control and display functions. Meanwhile, on the premise of not affecting the display function, the display device disclosed by the invention further integrates the element for detecting the blood sugar, thereby realizing the detection of the blood sugar.

Please refer to fig. 1. Fig. 1 illustrates a schematic top view of a display device 100 disposed in a mobile device 200 according to one embodiment of the present disclosure.

In fig. 1, the mobile device 200 is, for example, a mobile phone, but not limited to this. Thus, the user is shown an analyte 300 for detecting blood glucose, such as a finger.

As shown in fig. 1, the display device 100 includes a detection region SR. When blood glucose is to be detected, the user can place a finger (the object 300 to be detected) in the detection region SR. The components for realizing the blood sugar detection function are all arranged in the detection region SR. In the present embodiment, the detection region SR occupies only a part of the display device 100, and only normal pixels (pixels) are provided outside the detection region SR, thereby performing a normal display function. In some embodiments, a portion of the pixels in the detection region SR are integrated to perform a normal display function when no blood glucose is detected.

Specifically, in some embodiments, the flow of detecting blood glucose by the display device 100 of the present disclosure is as follows: first, the user activates the blood glucose test function of the mobile device 200 through an interface or application. Then, the display function of the mobile device 200 is turned off, which corresponds to the pixel on the display device 100 being turned off for display. Then, the blood glucose detecting element in the detection region SR is activated. The user can place a finger (object 300) in the detection region SR as shown in fig. 1 to measure blood glucose. Thus, the blood glucose detecting and displaying functions of the display device 100 can be kept from interfering with each other.

To further illustrate the structure of the display device 100, and thus to explain the implementation of the blood glucose detection and display function, please refer to fig. 2. Fig. 2 illustrates a schematic cross-sectional view of the display device 100 of fig. 1 according to an embodiment of the present disclosure. It should be noted that, for the sake of simplicity of illustration, fig. 2 shows only a partial section in the detection region SR of the display device 100, and the dimensions of the respective objects are shown only as schematic. For simplicity of illustration, FIG. 2 only shows a set of aligned resonant waveguide optical elements 150 and photosensitive thin film transistors 140. In some embodiments, as described above, the detection region SR may further include a plurality of other pixels for display, which are also not shown for simplicity of illustration.

The display device 100 shown in fig. 2 includes a display panel 110 for realizing a display function, and other elements integrated in the display panel 110 for realizing a blood glucose detection function. Specifically, in the present embodiment, the display device 100 includes a display panel 110, a thin film transistor 140 having a photosensitive function, and a resonant waveguide (resonant waveguide) optical element 150. The backlight module 113 further includes a sensing light source 170. For the sake of simplicity of illustration and to highlight the sensing light source 170 schematically, the specific structure of the backlight module 113 is not shown in the drawings.

Thus, a non-invasive blood glucose test function can be realized. For example, the sensing light source 170 can emit infrared rays for reflection by a finger (the object 300 to be measured). Since glucose in blood absorbs infrared rays with specific wavelength, the reflected light beam can carry blood glucose information, so that a non-invasive blood glucose detection function is realized.

Specifically, as shown in fig. 2, in the present embodiment, the display device 100 includes a backlight module 113 and a display panel 110 stacked thereon. The display panel 110 includes a transparent substrate 116 (e.g. a glass substrate), a pixel electrode 119, a liquid crystal layer 122 (including a plurality of aligned liquid crystals 123 as shown in fig. 2), a liquid crystal alignment film 125, a common electrode 120, a color filter 127, and a protective cover 134 (e.g. a transparent material such as protective glass) stacked in order from bottom to top. The liquid crystal layer 122 is disposed on the transparent substrate 116. The pixel electrode 119 is disposed on the transparent substrate 116. The liquid crystal alignment film 125 is disposed between the liquid crystal layer 122 and the color filter 127. The thin film transistor 140 is connected to the pixel electrode 119. In some embodiments, below the protective cover 134, a transparent electrode for touch control may be further integrated.

Thus, the thin film transistor 140 is used to charge the pixel electrode 119. The backlight module 113 provides a light source. Subsequently, the liquid crystal layer 122 can be adjusted by the pixel electrode 119, the liquid crystal alignment film 125, and the common electrode 120 to exhibit colors such as red, green, and blue through the filter region 131 of the color filter 127, thereby realizing a display function.

In this embodiment, as shown in fig. 2, the color filter 127 includes a filter region 131 and a black matrix region 128 surrounding the filter region 131 in the detection region SR. In fig. 2, only a part of the color filter 127 is schematically shown, and one filter area 131 of the color filter 127 is surrounded by the black matrix area 128. After passing through the filtering area 131, the light emitted by the backlight module 113 is in a single color, such as red light, green light or blue light. A plurality of differently colored filter areas 131 will be able to perform the function of a display. The black matrix region 128 is disposed substantially between a plurality of different filter regions 131 of the color filter 127 of the display device 100, and the black matrix region 128 can prevent unexpected leakage of light. In some embodiments, the pixel electrode 119 is, for example, a transparent Indium Tin Oxide (ITO) film.

In the present embodiment, the display device 100 further integrates the components for blood glucose detection (including the thin film transistor 140 with photosensitive function, the resonant waveguide optical element 150, the sensing light source 170, etc.) into the display panel 110 or the backlight module 113. As shown in fig. 1, these elements for blood glucose detection are integrated in the detection region SR.

In some embodiments, the color filter 127 further includes a plurality of pixel regions thereon. These pixel areas are purely for display and can only emit light including red light, green light and blue light, without having the function of blood glucose detection. In some embodiments, the color filter 127 outside the detection region SR has only a pixel region with simple functions. In some embodiments, the color filter 127 is also used for the pixel region of the display in the detection region SR. In other words, at least one or more pixel regions among the pixel regions of the color filter 127 are disposed in the detection region SR, so that the detection region SR realizes the display function through the pixel region and the filter region 131 surrounded by the black matrix region 128.

Returning to fig. 2. In this embodiment mode, a thin film transistor 140 having a photosensitive function is used. In this embodiment, the thin film transistor 140 is a thin film transistor sensor aligned with the resonant waveguide optical element 150, and has a photosensitive function. The thin film transistor 140 integrating the photosensitive function and the pixel electrode 119 can save the thickness of the display device 100 as a whole. In some other embodiments, the thin film transistor and the photosensitive element may be separately controlled.

Further, as shown in fig. 2, in the present embodiment, the elements for blood glucose detection are provided as follows.

The sensing light source 170 for detection is disposed on the backlight module 113. Specifically, in the present embodiment, the sensing light source 170 is a Near Infrared (NIR) light source, including a near infrared light emitting diode integrated on the same wafer. In detail, glucose in blood absorbs near infrared light with a wavelength of 1500nm to 1700nm, so in this embodiment, a near infrared light emitting diode with a wavelength of 1500nm to 1700nm is selected as the sensing light source 170.

The thin film transistor 140 is disposed on the transparent substrate 116. As described above, the thin film transistor 140 of the present embodiment has both the functions of light sensing and charging the pixel electrode 119.

The resonant waveguide optical element 150 is located in the black matrix region 128 and is disposed on the liquid crystal alignment film 125. More specifically, in the present embodiment, in the color filter 127, the black matrix region 128 surrounds the filter region 131 and is flush with the filter region 131, and the black matrix region 128 has an opening, and the resonant waveguide optical element 150 is disposed in the opening of the black matrix region 128. Therefore, the resonant waveguide optical element 150 is disposed between the thin film transistor 140 with the photosensitive function and the protective cover 134, and the resonant waveguide optical element 150 is disposed substantially aligned with the thin film transistor 140 with the photosensitive function. In other words, in the direction in which the display panels 110 are sequentially stacked from bottom to top, the resonant waveguide optical element 150 is aligned with the thin film transistor 140, and the vertical projection of the resonant waveguide optical element 150 can overlap with the resonant waveguide optical element 150.

The resonant waveguide optical element 150 is for filtering light so that only a portion of the wavelength of light can pass through. Specifically, the resonant waveguide optical element 150 of the present embodiment is designed to pass only near infrared light having a wavelength of 1500nm to 1700 nm. Since glucose in blood absorbs only near infrared light with a wavelength of 1500nm to 1700nm, blood glucose information is hidden in near infrared light with a wavelength of 1500nm to 1700nm, and the resonance waveguide optical element 150 filters out the near infrared light with a wavelength of 1500nm to 1700nm to be detected by the photosensitive thin film transistor 140, interference of light with other irrelevant wavelengths can be avoided, and the obtained blood glucose information is accurate. The obtained blood glucose information is, for example, the weight of glucose contained per unit volume of blood, and the unit is, for example, mg/dL.

As shown in fig. 2, in this embodiment, the resonant waveguide optical element 150 includes a plurality of gratings 152 and an interleaved dielectric structure 155. The grating 152 is disposed on the staggered dielectric structure 155, i.e., the grating 152 is located on a side of the resonant waveguide optical element 150 adjacent to the protective cover plate 134. The staggered dielectric structure 155 may include staggered stacked dielectric layers. Through the grating 152 and the staggered dielectric structure 155, the transmittance of the light with a specific wavelength passing through the staggered dielectric structure 155 can be increased, so that the filtering effect is exerted. For specific details, see the following discussion.

Thus, when the display device 100 is to perform the function of blood glucose detection, the near infrared light sensing light source 170 emits a sensing light beam, and the sensing light beam reaches the finger (the object 300 to be detected) to reflect and carry blood glucose information, and then the sensing light beam is filtered by the resonant waveguide optical element 150, and is received by the thin film transistor 140 with the photosensitive function, so as to obtain blood glucose information. The thin film transistor 140 includes a Dual-gate photo-sensitive a-Si: H thin film transistor (Dual-Gate Photosensitive a-Si: H TFT). In some embodiments, the material of thin film transistor 140 may include indium gallium arsenide (InGaAs).

In this embodiment, the display device 100 further includes a buffer film layer 180. As shown in fig. 2, the buffer layer 180 is disposed under the protective cover 134, and the buffer layer 180 is substantially filled between the resonant waveguide optical element 150 and the protective cover 134. Thus, in the present embodiment, the resonant waveguide optical element 150 is substantially disposed on the liquid crystal alignment film 125 and covered by the buffer film 180, so as to avoid damage caused by direct contact between the resonant waveguide optical element 150 and the protective cover 134. In some embodiments, the material of the buffer layer 180 may use a PL layer (Planarization layer) or photoresist as the buffer and planarization.

In fig. 2, when the blood glucose detecting function of the display device 100 is turned on, the light source of the visible light of the backlight module 113 is turned off to prevent noise, and only the near infrared light emitting diode as the sensing light source 170 is turned on to serve as the detecting light source. The resonant waveguide optical element 150 passes the reflected near infrared light. Otherwise, the method is used for controlling the flow rate of the liquid. When the blood glucose is not detected, the visible light source of the backlight module 113 is turned on, the near infrared light of the sensing light source 170 is turned off, the resonant waveguide optical element 150 blocks the visible light as much as possible, and the thin film transistor 140 is prevented from being affected by the visible light to generate a photo leakage current, so that the picture can be displayed normally. In some embodiments, the light source of the visible light of the backlight module 113 includes a light emitting diode that can emit red light, green light, and/or blue light.

Fig. 3A schematically illustrates an arrangement of the sensing light source 170 according to an embodiment of the disclosure. For the sake of simplicity of illustration, fig. 3A schematically illustrates the positions of the backlight module 113 and the sensing light source 170 disposed thereon, and the display panel 110 and other elements are omitted.

As shown in fig. 3A, the sensing light source 170 may be a light emitting diode chip integrating a plurality of near infrared light emitting diodes. The near infrared light emitting diode chip is used as a near infrared light emitting diode light source and is positioned below the resonant waveguide optical element. In fact, in some embodiments, the width of the near infrared light emitting diode chip is greater than the resonant waveguide optical element, and the light emitting area of the near infrared light emitting diode chip is greater than a single pixel in the display device 100, i.e., a single near infrared light emitting diode can have a sufficient light emitting area. In some embodiments, the plurality of near infrared light emitting diodes may not be integrated on the same near infrared light emitting diode chip, but may be directly disposed on the backlight module 113 or integrated directly in the backlight module 113. In some embodiments, the width of a single NIR LED may be greater than that of a single pixel region. Therefore, as shown in fig. 2, the sensing light source 170 is not completely blocked by the thin film transistor 140 and the resonant waveguide optical element 150, and the emitted sensing light beam can reach the finger (the object 300 to be measured) to obtain blood glucose information for being received by the thin film transistor 140 with photosensitive function. Since the resonant waveguide optical element 150 is disposed in the detection region SR and the black matrix region 128 does not affect the arrangement of the filter pattern of the filter region 131, the detection region SR can display a picture normally, i.e. the display device 100 can display a picture by turning on only the visible light source without turning on the near infrared light source for blood glucose detection.

In some embodiments, the detection region SR may not be limited, and a resonant waveguide optical element may be disposed in the black matrix region of any pixel region on the other visible region, and a corresponding sensing light source and photosensitive element may be disposed.

FIG. 3B schematically illustrates an arrangement of a sensing light source 170' according to another embodiment of the present disclosure. As shown in fig. 3B, the mobile device 200 'is provided with a display device 100'. In the display device 100', the sensing light sources 170', in this embodiment, two near infrared light bars, are disposed at two opposite edges of the display device 100'. More specifically, in the present embodiment, two near-infrared light bars of the sensing light source 170' are disposed on opposite frames of the mobile device 200', corresponding to opposite edges of the backlight module 113 of the display device 100', as in the direct type backlight. The present disclosure is not limited to the number of near-infrared light bars in this embodiment. For simplicity of illustration, fig. 3B only schematically illustrates the backlight module 113, and the sensing light source 170' above the backlight module 113. For the sake of simplicity of explanation and to highlight the sensing light source 170' schematically, the specific structure of the backlight module 113 is not shown in the drawings. In the display device 100', the sensing light source 170' is located below the thin film transistor and resonant waveguide optics. Similarly, the thin film transistor and the resonant waveguide optical element of the display device 100 'are located in the detection region SR (not shown), so as not to block the sensing light beam emitted from the sensing light source 170'.

For further illustration of the resonant waveguide optical device 150 of the present disclosure, please refer to fig. 4. Fig. 4 schematically illustrates a perspective view of a resonant waveguide optical device 150 according to an embodiment of the present disclosure.

As shown in fig. 4, the resonant waveguide optical device 150 includes an interleaved dielectric structure 155 and a plurality of gratings 152.

The gratings 152 are disposed on the staggered dielectric structures 155 and are arranged parallel to each other along the y-axis direction. As shown, the gratings 152 are arranged parallel to each other with a period length P. Each grating 152 has a width W and a thickness T.

In fig. 4, the staggered dielectric structure 155 includes a first dielectric layer 160 and a second dielectric layer 163. The first dielectric layer 160 and the second dielectric layer 163 are stacked alternately with each other along the z-axis direction. The first dielectric layer 160 serves as a base layer 161. The substrate layer 161 is disposed on a side opposite to the grating 152 and is connected to the liquid crystal alignment film 125 (as shown in fig. 2). Since the base layer 161 needs to have better flatness, the base layer 161 has a larger thickness HB. The thickness H2 of the second dielectric layer 163 is smaller than the thickness HB of the base layer 161 of the first dielectric layer 160.

Referring to fig. 2 and 4 simultaneously. When the sensing light source 170 emits the sensing light beam and reflects the sensing light beam to the object 300, the reflected sensing light beam passes through the resonant waveguide optical element 150. At this point, the reflected sensing beam will be incident from grating 152 into resonant waveguide optical element 150 at different angles from grating 152. The reflected sensing beam is then refracted by the first dielectric layer 160 and the second dielectric layer 163, and is finally received by the thin film transistor 140 having a photosensitive function.

The reflection of resonant waveguide optical element 150 at the refractive condition can be tuned by modifying grating 152 to have a width W and a thickness T, a period length P of grating 152, a thickness HB of substrate layer 161, and a thickness HB of second dielectric layer 163. The parallel arrangement of the gratings 152 can exclude the reflection with larger deviation of the incident angle, and the gratings 152, the first dielectric layer 160 and the second dielectric layer 163 are designed to make the specific wavelength have better transmittance. Light reaching wavelengths other than the specific wavelength will have significantly reduced transmittance due to the different reflection and refraction conditions.

Please refer to fig. 5A and fig. 5B. Fig. 5A schematically illustrates a cross-sectional view of a resonant waveguide optical device 150, according to an embodiment of the present disclosure. FIG. 5B shows the transmittance of the resonant waveguide optical device 150 of FIG. 5A for different wavelengths. FIG. 5A shows a resonant waveguide optical device 150 similar to that of FIG. 4, in which the staggered dielectric structure 155 includes a base layer 161 of a first dielectric layer 160 and a second dielectric layer 163. In other words, FIG. 5A shows a resonant waveguide optical element 150 having only two dielectric layers.

The gratings 152 are arranged in parallel with a period length P and have a thickness T and a width W. The base layer 161 of the first dielectric layer 160 has a thickness HB. The second dielectric layer 163 has a thickness H2. Through computer simulation, the period length P, the thickness T, the width W, the thickness HB, and the thickness H2 can be set, so that the transmittance of the resonant waveguide optical element 150 of fig. 5A at a specific wavelength is better.

The materials of the first dielectric layer 160 and the second dielectric layer 163 include, but are not limited to, silicon oxide (e.g., siO) ₂ ) And silicon nitride (for example: si (Si) ₃ N ₄ ). In the present embodiment, the material of the first dielectric layer 160 is silicon oxide (SiO ₂ ) Silicon nitride (Si) is selected as the second dielectric layer 163 ₃ N ₄ )。

The material of grating 152 includes, but is not limited to, aluminum. In this embodiment, the material of the grating 152 is aluminum.

In the resonant waveguide optical device 150 shown in fig. 5A, the width W of the grating 152 is preferably set to 0.7 μm, the period length P of the grating 152 is 1.2 μm, the thickness T of the grating 152 is 0.1 μm, the thickness HB of the base layer 161 of the first dielectric layer 160 is 0.6 μm, and the thickness H2 of the second dielectric layer 163 is 0.43 μm.

Thus, when the sensing light beam L is shown in fig. 5A, the resonant waveguide optical element 150 of fig. 5A is incident from above the grating 152, and a graph of transmittance for different wavelengths at the location shown in the figure can be obtained through computer simulation. It should be noted that fig. 5A only schematically illustrates the reflected sensing light beam L. The incident direction of the sensing beam L is understood to be emitted from a surface light source (corresponding to the finger as shown in fig. 2) above the grating 152, and other incident directions that may deviate from the z-axis direction are also included in the simulation of transmittance. Thus, FIG. 5B can be simulated according to the above parameter settings. Fig. 5B shows the transmittance of the resonant waveguide optical element 150 corresponding to different wavelengths.

As previously mentioned, glucose in blood absorbs near infrared light in the wavelength range of 1500nm to 1700 nm. In FIG. 5B, due to the reflection and refraction conditions set by the above parameters, there are resonance at wavelengths above 1200nm, and several transmittance peaks greater than 40% transmittance distributed discretely, and in the wavelength range of 1500nm to 1700nm, which is more sensitive to glucose, there is an occurrence of a transmittance peak close to 80%, the wavelength at which the transmittance peak occurs is close to 1500nm, and the half-width of the transmittance peak (corresponding to the difference between the maximum and minimum wavelengths of 40% transmittance) is about 200nm (i.e., the wavelength range of about 1500nm to 1700 nm). In contrast, in the wavelength range of 300nm to 1200nm, the transmittance is less than 50%, more specifically, the transmittance is approximately 40% or less.

Thus, as shown in fig. 5A, the resonant waveguide optical element having only two dielectric layers can make the wavelength range of 1500nm to 1700nm, which is sensitive to glucose, have a transmittance of approximately 80% at the highest, and the transmittance of about 40% or less for wavelengths outside the wavelength range of 1500 to 1700nm, so that the effect of filtering light in a specific wavelength range is remarkably achieved.

In the staggered dielectric structure 155 of the resonant waveguide optical device 150 shown in fig. 5A, only two dielectric layers are included, but the disclosure is not limited thereto. Specifically, the dielectric layers used in the resonant waveguide optical element 150 of the present disclosure may be two, three, four, five, six and seven layers.

Please refer to fig. 6A and fig. 6B. Fig. 6A schematically illustrates a cross-sectional view of a resonant waveguide optical device 150 according to another embodiment of the disclosure, and fig. 6B schematically illustrates transmittance of the resonant waveguide optical device 150 of fig. 6A for different wavelengths.

The difference between the resonant waveguide optical device shown in fig. 6A and the resonant waveguide optical device shown in fig. 5A is that the resonant waveguide optical device 150 shown in fig. 6A has three dielectric layers. As shown in fig. 6A, the staggered dielectric structure 155 of the resonant waveguide optical element 150 includes a first dielectric layer 160 and a second dielectric layer 163 that are staggered and stacked with each other, wherein the first dielectric layer 160 at the bottom layer is a base layer 161 having a larger thickness HB.

In the present embodiment, the material of the first dielectric layer 160 is silicon oxide SiO ₂ Silicon nitride Si is selected as the second dielectric layer 163 ₃ N ₄ The material of grating 152 is selected to be aluminum.

In the resonant waveguide optical element 150 shown in fig. 6A, based on computer simulation, it is preferable to set the width W of the grating 152 to 0.65 μm, the period length P of the grating 152 to 1.2 μm, the thickness T of the grating 152 to 0.1 μm, the thickness HB of the base layer 161 of the first dielectric layer 160 to 0.6 μm, the thickness H1 of the first dielectric layer 160 other than the base layer 161 to 0.25 μm, and the thickness H2 of the second dielectric layer 163 to 0.43 μm. By setting these parameters, the relationship of the transmittance to the wavelength of the resonant waveguide optical element 150 of fig. 6A can be obtained, as shown in fig. 6B.

In FIG. 6B, due to the reflection and refraction conditions set by the above parameters, there is resonance at a wavelength of 1200nm or more, and there are several transmittance peaks greater than 40% transmittance distributed discretely, and in the wavelength range of 1500nm to 1700nm, which is more sensitive to glucose, there is an occurrence of a transmittance peak close to 80%, the wavelength at which the transmittance peak occurs is close to 1500nm, and the half-width (the difference between the maximum and minimum wavelengths corresponding to 40% transmittance) of the transmittance peak is about 50nm. In contrast, the transmittance is approximately 40% or less in the wavelength range of 300nm to 1200 nm.

Therefore, the resonant waveguide optical element 150 with three dielectric layers as shown in fig. 6A can also exhibit the filtering effect.

Referring to fig. 7A, 8A, 9A and 10A, a resonant waveguide optical element 150 with three or more dielectric layers is schematically illustrated in cross-section of a plurality of resonant waveguide optical elements 150 according to various embodiments of the present disclosure. Fig. 7A, 8A, 9A and 10A illustrate resonant waveguide optical elements including four, five, six and seven dielectric layers, respectively. Fig. 7B, 8B, 9B and 10B show the transmittance versus wavelength of the resonant waveguide optical device 150 of fig. 7A, 8A, 9A and 10A, respectively.

In the resonant waveguide optical devices 150 shown in fig. 7A, 8A, 9A and 10A, the staggered dielectric structures 155 each include a first dielectric layer 160 and a second dielectric layer 163 stacked alternately, wherein the first dielectric layer 160 at the bottom is a substrate layer 161 having a larger thickness HB. The grating 152 is arranged in parallel on the topmost second dielectric layer 163. The first dielectric layer 160 is made of silicon oxide SiO ₂ Silicon nitride Si is selected for the second dielectric layer 163 ₃ N ₄ The material of the grating 152 is aluminum.

In fig. 7A, 8A, 9A and 10A, the same parameters can be more preferably used based on computer simulation, including setting the width W of the grating 152 to be 0.65 μm, the period length P of the grating 152 to be 1.2 μm, the thickness T of the grating 152 to be 0.1 μm, the thickness HB of the base layer 161 of the first dielectric layer 160 to be 0.6 μm, the thickness H1 of the first dielectric layer 160 other than the base layer 161 to be 0.25 μm, and the thickness H2 of the second dielectric layer 163 to be 0.43 μm. By setting these parameters, the relationship between the transmittance and the wavelength as shown in fig. 7B, 8B, 9B, and 10B can be obtained. As shown, the transmittance is better in the wavelength range above 1200nm, and the transmittance peak value is near 1500nm, and the half-width of the transmittance peak value is about 50nm. The transmittance below 1200nm is close to or less than 40%.

In summary, the number of dielectric layers of the resonant waveguide optical element 150 is two to seven, the transmittance peak is located between 1500nm and 1700nm, and the half-width of the transmittance peak is greater than 50nm. The resonant waveguide optical element 150 having two dielectric layers can have a half-width of the transmittance peak of more than 200nm, and can exhibit excellent filtering effect. Therefore, the resonant waveguide optical element 150 having two to seven dielectric layers can exhibit a filtering effect, and can exhibit remarkable screening properties for wavelengths of 1500nm to 1700 nm. The resonant waveguide optical elements 150 having the effect of filtering light with specific wavelengths can be disposed in the display device 100 shown in fig. 2, so as to filter out near infrared light of 1500nm to 1700nm including blood glucose detection information, thereby excluding interference with other wavelengths.

In the above parameter settings, the highest transmittance (transmittance peak) at 1500nm is targeted. The thickness of each of the first dielectric layer 160 and the second dielectric layer 163 (including the thickness H1, the thickness H2 and the thickness HB) may also have a space of 50nm, and such resonant optical waveguide devices can also perform similar filtering functions.

In summary, the present disclosure provides a display device with integrated blood glucose detection function. The display device can realize non-invasive blood glucose detection through a near infrared light source, and near infrared light with specific wavelength containing blood glucose information is filtered out through a resonance waveguide optical element integrated inside. The resonant waveguide optical element can comprise an interlaced dielectric structure consisting of a grating and two to seven dielectric layers, so that the peak transmittance and the half-width wavelength range thereof can be corresponding to the wavelength band which can be absorbed by glucose in blood, and the detected blood glucose information is more accurate.

Although the present disclosure has been described with reference to the above embodiments, it should be understood that the invention is not limited to the embodiments described above, but can be modified and practiced by those skilled in the art without departing from the spirit and scope of the present disclosure.

Claims

1. A display device, comprising:

the display panel comprises a detection area and a color filter, wherein the color filter is provided with a filtering area and a black matrix area surrounding the filtering area in the detection area;

a resonant waveguide optical filter element disposed in the black matrix region and having a plurality of gratings, wherein the resonant waveguide optical filter element further comprises an interleaved dielectric structure, the gratings being disposed on a first side of the interleaved dielectric structure opposite to the photosensitive element, the interleaved dielectric structure having one or more first dielectric layers and one or more second dielectric layers that are interleaved with each other, the one or more first dielectric layers and the one or more second dielectric layers being of different materials, the resonant waveguide optical filter element having a transmittance peak in a first wavelength range of near infrared light; and

a photosensitive element disposed in alignment with the resonant waveguide optical filter element, wherein the grating is located on a side of the resonant waveguide optical filter element opposite the photosensitive element; and

the sensing light source is arranged to emit a sensing light beam towards the object to be detected, and the sensing light beam is reflected by the object to be detected and received by the photosensitive element through the resonant waveguide optical filter element.

2. The display device of claim 1, wherein the color filter further has a plurality of pixel regions, at least one of the pixel regions being disposed in the detection region.

3. The display device of claim 1, wherein the resonant waveguide optical filter element has a transmittance of less than 50% in a second wavelength range of 300nm to 1200 nm.

4. The display device of claim 1, wherein a total number of layers of the one or more first dielectric layers and the one or more second dielectric layers is between two and seven.

5. The display device of claim 1, wherein a total number of the one or more first dielectric layers and the one or more second dielectric layers is two, the resonant waveguide optical filter element having a transmittance peak in the first wavelength range of 1500nm to 1700nm, a half height width of the transmittance peak being greater than 50nm.

6. The display device of claim 1, wherein the one or more first dielectric layers of the staggered dielectric structure further comprise a base layer having a thickness greater than a thickness of any of the other one or more first dielectric layers and the one or more second dielectric layers, the base layer being located on a second side of the staggered dielectric structure opposite the grating.

7. The display device of claim 6, wherein the one or more first dielectric layers other than the base layer have the same thickness and the one or more second dielectric layers have the same thickness.

8. The display device of claim 1, wherein the gratings are arranged parallel to each other on the staggered dielectric structure.

9. The display device of claim 1, wherein the photosensitive element is a thin film transistor sensor disposed in alignment with the resonant waveguide optical filter element.

10. The display device of claim 1, wherein the display panel further comprises a buffer film layer, wherein the buffer film layer fills between the resonant waveguide optical filter element and a protective cover plate located over the color filter.

11. The display device of claim 10, wherein the display panel further comprises a liquid crystal layer and a liquid crystal alignment film, the liquid crystal alignment film being located between the liquid crystal layer and the color filter, the resonant waveguide optical filter element being disposed on the liquid crystal alignment film and being covered by the buffer film layer.

12. The display device of claim 1, wherein the sensing light source is a near infrared light source, and the near infrared light source comprises a near infrared light emitting diode light source with a width larger than the resonant waveguide optical filter element and arranged below the resonant waveguide optical filter element, or two near infrared light bars arranged at two opposite edges of the display device.