CN111956236B - Display device - Google Patents

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 color filters. The color filter has a filter area and a black matrix area surrounding the filter area. The resonant waveguide optical element is arranged in the black matrix area and has a plurality of gratings. The photosensitive element is positioned in alignment with the resonant waveguide optics. The grating of the resonant waveguide optical element is located on the side of the resonant waveguide optical element opposite to the photosensitive element. The sensing light source is configured to emit sensing light beams towards the object to be measured. The sensing light beam is reflected by the object to be detected and received by the photosensitive element through the resonant waveguide optical element. In this way, display and blood glucose detection can be realized.

Description

display device

technical field

The disclosure relates to a display device.

Background technique

Blood glucose detection is an important means of health monitoring in modern times. The current methods of blood glucose detection are mainly invasive blood glucose detection. Patients need to endure the pain caused by the needle. After the blood flows out, the blood is collected and put into a testing instrument to obtain blood sugar related data.

In order to improve the invasive blood sugar detection, some non-invasive blood sugar detection has been proposed, including the sensing method combined with near-infrared optical technology. , to read out the blood glucose value. Most of these non-invasive blood sugar detection methods need to be equipped with specific equipment, which is slightly inconvenient to use. Therefore, how to effectively combine the non-invasive blood glucose detection technology with mobile devices to conveniently realize blood glucose detection is one of the problems that those skilled in the art want to solve.

Contents of the invention

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

According to an 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 includes a detection area and has color filters. The color filter has a filter area in the detection area and a black matrix area surrounding the filter area. The resonant waveguide optical element is arranged in the black matrix area and has a plurality of gratings. The photosensitive element is positioned in alignment with the resonant waveguide optics. The grating of the resonant waveguide optical element is located on the side of the resonant waveguide optical element opposite to the photosensitive element. The sensing light source is configured to emit sensing light beams towards the object to be measured. The sensing light beam is reflected by the object to be detected and received by the photosensitive element through the resonant waveguide optical element.

In some embodiments, the color filter further has a pixel area. At least one of the pixel areas is set in the detection area.

In one or more embodiments, the photosensitive element further includes an interleaved dielectric structure. The grating is on the interleaved dielectric structure. The interlaced dielectric structure has one or more first dielectric layers and one or more second dielectric layers stacked alternately. 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 layers and seven layers.

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

In some embodiments, the one or more first dielectric layers of the staggered dielectric structure further include a base layer. The thickness of the base layer is greater than the thickness of any one of the first dielectric layer and the second dielectric layer. The base layer is located on a second side of the staggered dielectric structure opposite to the grating.

In some embodiments, the one or more first dielectric layers other than the base layer have the same thickness. The second dielectric layer has 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 aforementioned display device further includes a buffer film layer. The buffer film layer fills the space between the resonant waveguide optical element and the protective cover on the color filter.

In some embodiments, the display panel further includes a liquid crystal alignment film. The liquid crystal alignment film is located 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 a buffer film layer.

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

To sum up, the display device of the present disclosure integrates a display panel, a sensing light source, a photosensitive element, and a resonant waveguide optical element to achieve the effect of blood glucose detection. The display device disclosed in the present disclosure can be applied to mobile devices such as mobile phones to conveniently realize the blood glucose detection function.

The above description is only used to explain the problems to be solved by the present disclosure, the technical means to solve the problems, and the effects thereof, etc. The specific details of the present disclosure will be introduced in detail in the following implementation methods and related drawings.

Description of drawings

The advantages and drawings of the present disclosure should be better understood from the following embodiments and with reference to the accompanying drawings. The descriptions of these drawings are merely examples of implementations, and thus should not be considered as limiting individual implementations or limiting the scope of patent claims for inventions.

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

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

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

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

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

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

FIG. 5B shows the transmittance of the resonant waveguide optical element of FIG. 5A corresponding to different wavelengths;

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

FIG. 6B shows the transmittance of the resonant waveguide optical element of FIG. 6A corresponding to different wavelengths;

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

FIG. 7B shows the transmittance of the resonant waveguide optical element of FIG. 7A corresponding to different wavelengths;

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

FIG. 8B shows the transmittance of the resonant waveguide optical element of FIG. 8A corresponding to different wavelengths;

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

FIG. 9B shows the transmittance of the resonant waveguide optical element of FIG. 9A corresponding to different wavelengths;

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

FIG. 10B shows the transmittance of the resonant waveguide optical element in FIG. 10A corresponding to different wavelengths.

Reference signs:

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 area

134: Protective cover 140: Thin film transistor

150: Resonant waveguide optical element 152: Grating

155:Interlaced dielectric structure 160:First dielectric layer

161: Base layer 163: Second dielectric layer

170: Sensing light source 180: Buffer film layer

200,200’: mobile device 300: object to be tested

W: Width T: Thickness

P: Period Length SR: Detection Area

HB, H1, H2: Thickness

Detailed ways

The following is a detailed description of the embodiments in conjunction with the accompanying drawings, but the provided embodiments are not used to limit the scope of the disclosure, and the description of the structure and operation is not used to limit the order of its execution. Any recombination of components The structure and the devices with equivalent functions are all within the scope of this disclosure. In addition, the drawings are for illustrative purposes only and are not drawn to original scale. For ease of understanding, the same or similar elements will be described with the same symbols in the following description.

In addition, the terms (terms) used in the entire specification and the scope of the patent application, unless otherwise specified, generally have the usual meaning of each term used in this field, in the disclosed content and in the special content. significance. Certain terms used to describe the disclosure are discussed below or elsewhere in this specification to provide those skilled in the art with additional guidance in describing the disclosure.

In this document, terms such as "first" and "second" are only used to separate elements or operating methods with the same technical term, and are not intended to represent an order or limit the present disclosure.

In addition, similar terms such as "comprising", "including", "providing" are all open-ended restrictions in this document, meaning including but not limited to.

Further, in this article, unless the article is specifically limited in the context, "a" and "the" can generally refer to one or more. It will be further understood that the terms "comprising", "including" and "comprising", "having" and similar words indicate the features, regions, integers, steps, operations, elements and/or components described therein, but do not exclude one or more other features and regions described or added thereto , integers, steps, operations, elements, components, and/or groups thereof.

In order to realize the function of conveniently detecting blood sugar, the present disclosure provides a display device. The display device can be used on a mobile device such as a mobile phone, which can have both touch and display functions. At the same time, on the premise of not affecting the display function, the display device of the present disclosure further integrates components for blood glucose detection, so as to realize blood glucose detection.

Please refer to Figure 1 first. FIG. 1 shows a schematic top view of a display device 100 disposed on a mobile device 200 according to an embodiment of the present disclosure.

In FIG. 1 , the mobile device 200 is, for example, a mobile phone, but it is not limited thereto. In this way, as shown in the figure, the test object 300 used by the user to detect blood sugar is, for example, a finger.

As shown in FIG. 1 , the display device 100 includes a detection area SR. When wanting to detect blood sugar, the user can place the finger (the object to be tested 300 ) in the detection area SR. The components realizing the blood glucose detection function are all arranged in the detection area SR. In this embodiment, the detection area SR only occupies a part of the display device 100 , and there are only ordinary pixels outside the detection area SR, so as to perform a normal display function. In some implementations, part of the pixels are integrated into the detection region SR, so as to perform a normal display function when blood glucose detection is not performed.

Specifically, in some embodiments, the process of detecting blood glucose through the display device 100 of the present disclosure is as follows: first, the user activates the blood glucose detection function of the mobile device 200 through an interface or an application program. Subsequently, the display function of the mobile device 200 is turned off, which corresponds to that the display pixels on the display device 100 are turned off. Then, the elements for blood glucose detection in the detection area SR are activated. As shown in FIG. 1 , the user can place the finger (the object to be tested 300 ) in the detection area SR to measure the blood sugar. In this way, the blood glucose detection and display functions of the display device 100 can not interfere with each other.

In order to further illustrate the structure of the display device 100, so as to illustrate the realization of its blood glucose detection and display functions, 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 purpose of simple description, FIG. 2 only shows a partial section in the detection area SR of the display device 100 , and the sizes of the objects shown are only schematic. For the purpose of simple illustration, FIG. 2 only shows a set of aligned resonant waveguide optical elements 150 and photosensitive thin film transistors 140. In some implementations, as mentioned above, the detection region SR may further include a plurality of other display pixels, which are also not shown for the purpose of simple illustration.

Part of the display device 100 shown in FIG. 2 includes a display panel 110 for realizing a display function, and other components integrated in the display panel 110 for realizing a blood glucose detection function. Specifically, in this embodiment, the display device 100 includes a display panel 110, a thin film transistor 140 having a photosensitive function, and a resonant waveguide optical element 150. The backlight module 113 further includes a sensing light source 170 . For the purpose of simple illustration and to highlight the sensing light source 170 schematically, the specific structure of the backlight module 113 is not shown in the figure.

In this way, a non-invasive blood glucose detection function can be realized. For example, the sensing light source 170 can emit infrared rays for reflection by the finger (the object under test 300 ). Since the glucose in the blood absorbs infrared rays of a specific wavelength, the reflected light beam can carry blood sugar information, thereby realizing the non-invasive blood sugar detection function.

Specifically, as shown in FIG. 2 , in this embodiment, the display device 100 includes a backlight module 113 and a display panel 110 stacked thereon. The display panel 110 is stacked sequentially from bottom to top and includes a transparent substrate 116 (for example, a glass substrate), pixel electrodes 119, a liquid crystal layer 122 (including a plurality of arranged liquid crystals 123, as shown in FIG. 2 ), a liquid crystal alignment film 125, The common electrode 120 , the color filter 127 and the protection cover 134 (for example, transparent materials such as glass for protection). The liquid crystal layer 122 is disposed on the transparent substrate 116 . The pixel electrodes 119 are located 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, a transparent electrode for touch control can be further integrated under the protective cover 134 .

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

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

In this embodiment, the display device 100 further integrates the elements used for blood glucose detection (including the thin film transistor 140 with photosensitive function, the resonant waveguide optical element 150 and the sensing light source 170, etc.) into the display panel 110 or the backlight module. Group 113. As shown in FIG. 1 , these components 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. These pixel areas are purely used for display, and can only emit red light, green light and blue light, but do not have the function of blood sugar detection. In some embodiments, the color filter 127 outside the detection area SR only has pixel areas with pure functions. However, in some implementations, in the detection area SR, the color filter 127 is only used for the display pixel area. In other words, among the plurality of pixel areas of the color filter 127, at least one or more pixel areas are arranged in the detection area SR, so that the detection area SR passes through the pixel area and the filter light surrounded by the black matrix area 128 Area 131 realizes the function of display.

Back to Figure 2. In this embodiment, a thin film transistor 140 with photosensitive function is used. In this embodiment, the thin film transistor 140 is a thin film transistor sensor disposed in alignment with the resonant waveguide optical element 150 , and has a light-sensing function. Integrating the photosensitive function and the thin film transistor 140 controlling the pixel electrode 119 can save the overall thickness of the display device 100 . However, in some other implementation manners, the thin film transistor and the photosensitive element can also be separately provided for controlling.

Further, as shown in FIG. 2 , in this embodiment, the components used for blood glucose detection are set as follows.

The sensing light source 170 for detection is disposed on the backlight module 113 . Specifically, in this embodiment, the sensing light source 170 is a near infrared (near infrared, NIR) light source, including near infrared light emitting diodes integrated on the same chip. Specifically, 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 mentioned above, the thin film transistor 140 of this embodiment has both the functions of sensing light and charging the pixel electrode 119 .

The resonant waveguide optical element 150 is located in the black matrix area 128 and disposed on the liquid crystal alignment film 125 . More specifically, in this embodiment, in the color filter 127, the black matrix area 128 surrounds the filter area 131 and is flush with the filter area 131, and the black matrix area 128 has openings, and the resonant waveguide The optical element 150 is arranged in the opening of the black matrix region 128. Therefore, the resonant waveguide optical element 150 is disposed between the photosensitive thin film transistor 140 and the protective cover 134 , and the resonant waveguide optical element 150 is substantially aligned with the photosensitive thin film transistor 140 . In other words, the resonant waveguide optical element 150 is aligned with the thin film transistor 140 in the direction in which the display panels 110 are stacked sequentially from bottom to top, 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 used to filter light so that only part of the wavelength of light can pass through. Specifically, the resonant waveguide optical element 150 of this embodiment is designed to allow only near-infrared light with a wavelength of 1500 nm to 1700 nm to pass through. Since glucose in blood only absorbs near-infrared light with a wavelength of 1500nm to 1700nm, blood sugar information will be hidden in the near-infrared light with a wavelength of 1500nm to 1700nm, and the near-infrared light with a wavelength of 1500nm to 1700nm is filtered out by the resonant waveguide optical element 150 to sense The detection of light by the thin film transistor 140 can avoid the interference of light of other irrelevant wavelengths and obtain accurate blood sugar information. The obtained blood glucose information is, for example, the weight of glucose contained in a 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 complex grating 152 and a staggered dielectric structure 155 . The grating 152 is disposed on the interleaved dielectric structure 155 , that is, the grating 152 is located on a side of the resonant waveguide optical element 150 adjacent to the protective cover 134 . The staggered dielectric structure 155 may include staggered stacked dielectric layers. According to the design, through the grating 152 and the staggered dielectric structure 155 , the transmittance of the light of a specific wavelength passing through the staggered dielectric structure 155 can be increased, thereby exerting the effect of light filtering. For details, please see the subsequent discussion.

In this way, 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 beam, and the sensing beam reaches the finger (the object under test 300 ) to be reflected and carry blood glucose information, and then passes through the resonant waveguide optical element 150 The light is filtered and received by the light-sensitive thin film transistor 140 to obtain blood sugar information. The thin film transistor 140 includes a dual-gate photosensitive a-Si:H thin film transistor (Dual-Gate Photosensitive a-Si:H TFT). In some embodiments, the material of the 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 film layer 180 is disposed under the protection cover 134 , and the buffer film layer 180 is substantially filled between the resonant waveguide optical element 150 and the protection cover 134 . In this way, in this embodiment, the resonant waveguide optical element 150 is substantially disposed on the liquid crystal alignment film 125 and covered by the buffer film layer 180 to prevent the resonant waveguide optical element 150 from being damaged due to direct contact with the protective cover 134 . In some embodiments, the material of the buffer film layer 180 can use a PL layer (Planarization layer) or a photoresist for buffering and planarization.

In FIG. 2, when the blood glucose detection function of the display device 100 is turned on, the visible light source of the backlight module 113 is turned off to prevent noise generation, and only the near-infrared light-emitting diode as the sensing light source 170 is turned on for detection. light source. The resonant waveguide optical element 150 passes reflected near-infrared light. on the contrary. When the blood sugar 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, and the resonant waveguide optical element 150 will try to block visible light to prevent the thin film transistor 140 from being affected by visible light to generate light leakage current, and Then the screen can be displayed normally. In some embodiments, the visible light source of the backlight module 113 includes light emitting diodes that can emit red light, green light and/or blue light.

FIG. 3A schematically illustrates the arrangement of the sensing light source 170 according to an embodiment of the present disclosure. For the purpose of simple illustration, FIG. 3A only schematically shows the positions of the backlight module 113 and the sensing light source 170 disposed thereon, while the display panel 110 and other components 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 located under the resonant waveguide optical element. In fact, in some embodiments, the width of the near-infrared light-emitting diode chip is larger than that of the resonant waveguide optical element, and the light-emitting area of the near-infrared light-emitting diode chip is larger than a single pixel in the display device 100, that is, a single near-infrared light-emitting diode chip. Infrared light-emitting diodes can have sufficient light-emitting area. In some embodiments, a plurality of near-infrared light-emitting diodes may not be integrated into the same near-infrared light-emitting diode chip, but directly arranged on the backlight module 113, or directly integrated in the backlight module 113 . In some embodiments, the width of a single near-infrared light-emitting diode can be greater than that of a single pixel area. Therefore, as shown in FIG. 2, the sensing light source 170 will not be 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 under test 300) to obtain blood glucose information and become photosensitive. Received by the thin film transistor 140 of the function. Because the resonant waveguide optical element 150 is set in the black matrix area 128 of the detection area SR and does not affect the filter pattern setting of the filter area 131, the detection area SR can also display the picture normally, that is, the proximity sensor for blood sugar detection is not turned on. For the infrared light source, only the visible light source is turned on, and the display device 100 can display images.

In some embodiments, the detection area SR may not be limited, and the black matrix area of any pixel area on other visible areas may also be provided with a resonant waveguide optical element, and a corresponding sensing light source and photosensitive element.

Fig. 3B schematically illustrates the arrangement of the sensing light source 170' according to another embodiment of the present disclosure. As shown in FIG. 3B, a display device 100' is provided on a mobile device 200'. In the display device 100', sensing light sources 170', in this embodiment two near-infrared light strips, are disposed on two opposite edges of the display device 100'. More specifically, in this embodiment, the two near-infrared light strips of the sensing light source 170' are arranged on two opposite frames of the mobile device 200', corresponding to two opposite sides of the backlight module 113 of the display device 100'. On the edge, like the way direct-lit backlights set up the light source. However, the present disclosure does not limit the number of near-infrared light bars in this embodiment. For the purpose of simple illustration, FIG. 3B only schematically shows the backlight module 113 and the sensing light source 170' located above the backlight module 113. For the purpose of simple illustration and to highlight the sensing light source 170' schematically, the specific structure of the backlight module 113 is not shown in the figure. In the display device 100', the sensing light source 170' is located below the thin film transistor and the resonant waveguide optical element. Similarly, the thin film transistor and resonant waveguide optical element of the display device 100' are located in the detection region SR (not shown), so they will not block the sensing beam emitted by the sensing light source 170'.

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

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

The gratings 152 are disposed on the staggered dielectric structure 155 and arranged parallel to each other along the y-axis direction. As shown, these 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 along the z-axis direction. The first dielectric layer 160 serves as the base layer 161 . The base layer 161 is located on a side opposite to the grating 152, and is arranged to be connected to the liquid crystal alignment film 125 (as shown in FIG. 2 ). Since the base layer 161 requires 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 .

Refer to FIG. 2 and FIG. 4 at the same time. When the sensing light beam emitted by the sensing light source 170 is reflected by the object under test 300 , the reflected sensing beam will pass through the resonant waveguide optical element 150 . At this time, the reflected sensing light beam will enter the resonant waveguide optical element 150 from the grating 152 at different angles from the grating 152 . Subsequently, the reflected sensing light beam will be refracted by the first dielectric layer 160 and the second dielectric layer 163 before being received by the thin film transistor 140 with photosensitive function.

The reflection and refraction conditions of the resonant waveguide optical element 150 can be adjusted by modifying the width W and thickness T of the grating 152 , the period length P of the grating 152 , the thickness HB of the base layer 161 and the thickness HB of the second dielectric layer 163 . The gratings 152 arranged in parallel can eliminate some reflections with large deviations in incident angles, and the gratings 152, the first dielectric layer 160 and the second dielectric layer 163 are designed to enable specific wavelengths to have better transmittance. For light of other wavelengths other than the specified wavelength, the transmittance will be significantly reduced because it does not meet the designed 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 element 150 according to an embodiment of the present disclosure. FIG. 5B shows the transmittance of the resonant waveguide optical element 150 in FIG. 5A corresponding to different wavelengths. FIG. 5A shows a resonant waveguide optical element 150 similar to FIG. 4 , and its interleaved 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 with 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, thickness T, width W, thickness HB and thickness H2 can be set so that the resonant waveguide optical element 150 in FIG. 5A has a better transmittance at a specific wavelength.

Materials of the first dielectric layer 160 and the second dielectric layer 163 include but are not limited to silicon oxide (eg, SiO ₂ ) and silicon nitride (eg, Si ₃ N ₄ ). In this embodiment, the first dielectric layer 160 is made of silicon oxide (SiO ₂ ), and the second dielectric layer 163 is made of silicon nitride (Si ₃ N ₄ ).

The material of the 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 element 150 shown in FIG. 5A, it is preferable to set the width W of the grating 152 to be 0.7 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, and the first dielectric layer The thickness HB of the base layer 161 of 160 is 0.6 μm, and the thickness H2 of the second dielectric layer 163 is 0.43 μm.

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

As mentioned earlier, glucose in blood absorbs near-infrared light in the wavelength range of 1500nm to 1700nm. In Figure 5B, due to the reflection and refraction conditions set by the above parameters, there is a resonance phenomenon above the wavelength of 1200nm, and there are several transmittance peaks with a discrete distribution greater than 40% transmittance, and it is more sensitive to glucose In the wavelength range from 1500nm to 1700nm, there is a peak of nearly 80% transmittance, and the wavelength at which the peak transmittance occurs is close to 1500nm, and the half-maximum width of the transmittance peak (corresponding to the maximum and The minimum wavelength difference) is about 200 nm (ie, a wavelength range of about 1500 nm to 1700 nm). Relatively, in the wavelength range of 300nm to 1200nm, the transmittance is less than 50%, more specifically, the transmittance is approximately less than or equal to 40%.

In this way, as shown in Figure 5A, the resonant waveguide optical element with only two dielectric layers enables the near-infrared light in the wavelength range of 1500 nm to 1700 nm, which is sensitive to glucose, to have a maximum penetration rate of nearly 80%, while for the wavelength range of 1500 nm to 1700 nm The transmittance outside the wavelength range of 1700nm is roughly less than or equal to 40%, which significantly achieves the effect of filtering out light in a specific wavelength range.

In the interleaved dielectric structure 155 of the resonant waveguide optical element 150 shown in FIG. 5A , only two dielectric layers are included, but the present disclosure is not limited thereto. Specifically, the resonant waveguide optical element 150 of the present disclosure may use two, three, four, five, six or seven layers of dielectric layers.

Please refer to FIG. 6A and FIG. 6B . FIG. 6A schematically shows a cross-sectional view of a resonant waveguide optical element 150 according to another embodiment of the present disclosure, and FIG. 6B shows the transmittance of the resonant waveguide optical element 150 in FIG. 6A corresponding to different wavelengths.

The difference between the resonant waveguide optical element shown in FIG. 6A and FIG. 5A is that the resonant waveguide optical element 150 shown in FIG. 6A has three dielectric layers. As shown in FIG. 6A , the interleaved dielectric structure 155 of the resonant waveguide optical element 150 includes first dielectric layers 160 and second dielectric layers 163 stacked alternately, wherein the bottommost first dielectric layer 160 has a larger Base layer 161 of thickness HB.

In this embodiment, the first dielectric layer 160 is made of silicon oxide SiO ₂ , the second dielectric layer 163 is made of silicon nitride Si ₃ N ₄ , and the material of the grating 152 is made of 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 be 0.65 μm, the period length P of the grating 152 to be 1.2 μm, and 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 is 0.6 μm, the thickness H1 of the first dielectric layer 160 other than the base layer 161 is 0.25 μm, and the thickness H2 of the second dielectric layer 163 is 0.43 μm. By setting these parameters, the relationship between the transmittance and the wavelength of the resonant waveguide optical element 150 in FIG. 6A can be obtained, as shown in FIG. 6B .

In Figure 6B, due to the reflection and refraction conditions set by the above parameters, there is also a resonance phenomenon at wavelengths above 1200nm, and there are several discretely distributed peaks of the transmittance greater than 40% of the transmittance. In the sensitive wavelength range from 1500 nm to 1700 nm, there is a peak of nearly 80% transmittance, and the wavelength where the peak transmittance occurs is close to 1500nm, and the half-maximum width of the peak transmittance (corresponding to 40% transmittance) The difference between the maximum and minimum wavelength) is about 50nm. In contrast, in the wavelength range of 300nm to 1200nm, the transmittance is generally less than or equal to 40%.

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

For the resonant waveguide optical element 150 with more than three dielectric layers, please refer to FIG. 7A , FIG. 8A , FIG. 9A and FIG. 10A . Sectional view. 7A, 8A, 9A and 10A illustrate resonant waveguide optical elements including four, five, six and seven dielectric layers, respectively. 7B, FIG. 8B, FIG. 9B and FIG. 10B respectively show the relationship between the transmittance and the wavelength of the resonant waveguide optical element 150 in FIG. 7A, FIG. 8A, FIG. 9A and FIG. 10A.

In the plurality of resonant waveguide optical elements 150 depicted in FIG. 7A, FIG. 8A, FIG. 9A and FIG. 10A, the interleaved dielectric structure 155 includes first dielectric layers 160 and second dielectric layers 163 stacked alternately, wherein the most The bottom first dielectric layer 160 is a base layer 161 with a larger thickness HB. The gratings 152 are arranged in parallel on the topmost second dielectric layer 163 . The first dielectric layer 160 is made of silicon oxide SiO ₂ , and the second dielectric layer 163 is made of silicon nitride Si ₃ N ₄ , and the material of the grating 152 is made of aluminum.

In FIG. 7A, FIG. 8A, FIG. 9A and FIG. 10A, based on computer simulation, the same parameters can be more preferably set, including setting the width W of the grating 152 to 0.65 μm, and the period length P of the grating 152 to 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, the thickness H1 of the first dielectric layer 160 other than the base layer 161 is 0.25 μm, and the second The thickness H2 of the dielectric layer 163 is 0.43 μm. Through the setting of these parameters, the relationship between transmittance and wavelength as shown in Fig. 7B, Fig. 8B, Fig. 9B and Fig. 10B can be obtained. As shown in the figure, the transmittance has a better transmittance in the wavelength range above 1200nm, and has a transmittance peak at a wavelength close to 1500nm, and has a half maximum width of about 50nm. The transmittance below 1200nm wavelength is close to or less than 40%.

To sum up, the resonant waveguide optical element 150 with two to seven dielectric layers has a transmittance peak at 1500nm to 1700nm, and the FWHM of the transmittance peak is greater than 50nm. The resonant waveguide optical element 150 with the second dielectric layer can have a half-maximum width of the transmittance peak greater than 200 nm, and can exert an excellent filtering effect. Therefore, the resonant waveguide optical element 150 with two to seven dielectric layers can all play a light filtering effect, and all can have remarkable screening properties for wavelengths from 1500 nm to 1700 nm. And these resonant waveguide optical elements 150 with the effect of filtering light of specific wavelengths can be installed in the display device 100 as shown in FIG. interference.

In the above parameter settings, the highest transmittance (peak transmittance) is targeted at 1500nm. For each of the first dielectric layer 160 and the second dielectric layer 163, the thickness of these dielectric layers (including the thickness H1, the thickness H2 and the thickness HB) can also be increased or decreased by 50nm. Such a resonant optical waveguide element, can also perform a similar filtering function.

To sum up, the present disclosure provides a display device integrating blood glucose detection function. The display device can realize non-invasive blood glucose detection through a near-infrared light source, and filter out near-infrared light of a specific wavelength containing blood glucose information through an integrated resonant waveguide optical element. The resonant waveguide optical element can include a staggered dielectric structure composed of a grating and two to seven dielectric layers, so that the wavelength range of the peak transmittance and its full width at half maximum can correspond to the wavelength band that glucose in blood can absorb , so that the blood sugar information that can be detected is more accurate.

Although the present disclosure has been disclosed above in terms of implementation, it is not intended to limit the present disclosure. Any person with ordinary knowledge in the field may make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore The scope of protection of this disclosure should be defined by the appended claims.

Claims (12)

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.

Images