TWM587775U - Display device having pixel structure and fingerprint identification chip - Google Patents

Abstract

A display device capable of detecting a fingerprint of a finger includes a first substrate, a photo sensor disposed on the first substrate, a pixel structure disposed on the first substrate for generating a detecting light and a light collimating structure corresponding to the photo sensor and disposed between the photo sensor and the finger, wherein the light collimating structure includes a multi-layer structure for filtering a reflection light reflected from the finger.

Description

Display device with pixel structure and fingerprint recognition chip

This creation relates to a display device and a fingerprint recognition chip, and more particularly to a display device with a pixel structure and a fingerprint recognition chip.

With the rapid development of technology, portable display devices, such as: smart phones, tablet PCs, or laptop PCs, have become essential tools in people's lives. As its functions become more diverse, private data, such as phone books, photos, or personal identity information, are often stored in it, with some privacy. To protect this data, fingerprint recognition devices have been developed for use in portable display devices. However, traditional fingerprint recognition devices are not transparent and cannot be placed in the display area, so the screen ratio of the display device is limited. For this reason, an optical fingerprint recognition device has been developed to enable it to detect fingerprints without affecting the screen ratio. The optical fingerprint recognition device obtains the fingerprint image by detecting the light reflected from the finger. However, the light will diverge after being reflected by the finger, causing the reflected light corresponding to different fingerprints to interfere with each other, making the image detected by the fingerprint recognition device not. It will affect the result of fingerprint recognition. Therefore, how to reduce mutual interference of reflected light corresponding to different fingerprints to improve the accuracy of fingerprint recognition is still a very important issue.

This creation provides a display device with a pixel structure. The display device can be used to detect the fingerprint of a finger. The display device includes a light collimation structure to filter incident light with an excessive angle. The display device can reduce stray light reaching the light sensor through the light collimation structure, and improve the reliability of fingerprint recognition.

According to some embodiments, the present invention provides a display device with a pixel structure, which can be used to detect a fingerprint of a finger. The display device includes a first substrate, a light sensor disposed on the first substrate, and a light collimating structure corresponding to the light sensor and disposed between the light sensor and a finger. The light collimation structure includes a multilayer structure, and filters a reflected light reflected by a finger.

According to some embodiments, the present invention provides a fingerprint recognition chip for detecting a finger's fingerprint in a display device. The display device includes a light sensor and a light collimation structure. The light collimation structure is disposed on the light sensor. Device and fingers. The light collimation structure includes a multilayer structure for filtering a reflected light reflected by a finger. The fingerprint recognition chip is electrically connected to the light sensor, and uses the filtered reflected light to draw a fingerprint pattern and compares it with a known fingerprint pattern to achieve a recognition function.

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

It should be understood that when an element or film is referred to as being "on" or "connected to" another element or film, it can be directly on or directly connected to the other element or film. So far, another element or film layer, or an interposed element or film layer exists between the two. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element or film layer, there is no intervening element or film layer in between.

Although the terms first, second, third ... can be used to describe various constituent elements, the constituent elements are not limited by this term. This term is only used to distinguish a single constituent element from other constituent elements in the description. The same terms may not be used in the claims, but may be replaced by first, second, third, etc. in the order of element declarations in the claims. Therefore, in the following description, a first constituent element may be a second constituent element in a claim.

It should be noted that the following embodiments can be replaced, recombined, and mixed to complete other embodiments without departing from the spirit of the present disclosure.

Please refer to FIG. 1, FIG. 2, and FIG. 3. FIG. 1 is a schematic cross-sectional view of a display device according to the first embodiment of the creation, and FIG. 2 is a functional block diagram of the display device according to the first embodiment of the creation. Figure 3 is a schematic top view of the pixel structure of the first embodiment of the creation. As shown in Figure 1, the display device 100 includes a first substrate 102, a plurality of pixel structures 104, a plurality of light collimation structures 106, and a plurality of The light sensor 108 and the second substrate 116. In order to clearly display the positions of the pixel structure 104, the light collimation structure 106, and the light sensor 108, FIG. 1 only shows a single light collimation structure 106 and the light sensor 108, but is not limited thereto. The second substrate 116 is disposed on the first substrate 102 as a substrate on which the display device 100 is touched by the finger FG. The second substrate 116 may be, for example, a cover lens to cover the first substrate 102, the pixel structure 104, the light collimation structure 106, and the light sensor 108, but is not limited thereto. In some embodiments, the second substrate 116 may include, for example, a polarizer and an adhesive layer, but is not limited thereto. In some embodiments, the second substrate 116 may further include a touch element for detecting the position of the finger. The pixel structure 104 is disposed on the first substrate 102 to generate light. Each pixel structure is related to a unit display effect. The display device 100 of this embodiment is a non-self-luminous display device. The liquid crystal display device is taken as an example for further description, but it is not limited thereto. In this embodiment, the display device 100 may further include a third substrate 118, a backlight module BL and a black matrix BM, the pixel structure 104 is disposed between the first substrate 102 and the third substrate 118, and the backlight module BL is disposed on Below the first substrate 102, a polarizer (not shown) may be included between the backlight module BL and the first substrate 102. The first substrate 102 and the third substrate 118 may be glass substrates, but not limited thereto. As shown in FIG. 1, when the display device 100 performs fingerprint recognition, the backlight module BL can generate a backlight. By controlling the light transmission or shielding of the pixel structure 104, at least one of the pixel structures 104 can allow the backlight to pass through. The pixel structure 104 provides detection light L, and the detection light L can generate one or more reflected light after being reflected by the finger FG, such as light L1 and light L2 shown in FIG. 1, where light L1 represents reflected light. Light (ie, stray light) with a large angle (ie, incident angle) between the direction and the normal direction of the upper surface 106a of the light collimation structure 106, and the light ray L2 represents the proceeding direction of the reflected light and the upper surface 106a of the light collimation structure 106 Light with a smaller angle (ie, angle of incidence) in the direction of the normal.

In this embodiment, the pixel structure 104 may include a thin film transistor (TFT) layer 110, a liquid crystal layer 112, and a color filter layer 114. The thin film transistor layer 110 is disposed on the liquid crystal layer 112 and the first substrate 102. The color filter layer 114 is disposed between the liquid crystal layer 112 and the third substrate 118, but is not limited thereto. The pixel structure 104 may further include a pixel electrode DE disposed between the liquid crystal layer 112 and the thin film transistor layer 110, but is not limited thereto. The thin film transistor layer 110 may include, for example, one or more thin film transistor TFTs, which are electrically connected to the pixel electrode DE, thereby controlling the liquid crystal molecules in the liquid crystal layer 112 located on the pixel electrode DE. The position of the thin film transistor TFT shown in FIG. 1 is merely an example, but is not limited thereto. In some embodiments, the thin film transistor TFT may be located directly below the black matrix BM. The liquid crystal layer 112 is disposed between the thin film transistor layer 110 and the color filter layer 114, and may include a liquid crystal material, such as a nematic liquid crystal, a smectic liquid crystal, or other suitable liquid crystal materials, but not This is the limit. The color filter layer 114 may include a plurality of color filters, but the creation is not limited thereto. According to this embodiment, the light sensor 108 is disposed on the first substrate 102. More specifically, the light sensor 108 is located in the thin film transistor layer 110, but is not limited thereto. In addition, the light sensor 108 may include, but is not limited to, a photodiode, a phototransistor, or other suitable light sensing elements. The light sensor 108 in this embodiment can be used to receive the reflected light after the detection light L is reflected by the finger FG, and to perform fingerprint identification. In detail, the creation may include a fingerprint recognition chip 109, which may be used to detect the fingerprint of the finger FG in the display device 100. As shown in FIG. 2, the light sensor 108 can be electrically connected to a fingerprint recognition chip 109. The fingerprint recognition chip 109 can draw a fingerprint pattern through the reflected light received by the light sensor 108 and compare it with the fingerprint pattern of the system memory. Achieve recognition function. The fingerprint recognition chip 109 may be an independent function chip or an integrated fingerprint recognition, touch and display chip, which is not limited in this creation. It should be noted that the light sensor “which can be used to receive the reflected light after the detection light L is reflected by the finger FG” may not be limited to the light sensor 108 shown in FIG. 1. For example, the light L2 can be received by the light sensor 108 and can be defined as collimated light with a smaller incident angle, and the light L1 can be directed to another light sensor on the right side of the light sensor 108 (No. (Not shown in Fig. 1), and the light sensor may be stray light with a large incident angle, but is not limited thereto. For the content of the light sensor absorbing reflected light in the following, please refer to the above description, so it will not be repeated here. The light collimation structure 106 is disposed between the light sensor 108 and the finger FG, and is used to filter reflected light with an excessively large incident angle toward the light sensor 108, so that the reflected light with a smaller incident angle can be detected by the light sensor 108. Receiving, thereby reducing the reflected light reflected by different parts of the finger received by the same light sensor 108, thereby improving the image quality detected by the light sensor 108. The light collimation structure 106 may overlap the light sensor 108 in the direction D1, or the light collimation structure 106 may cover the light sensor 108 in the direction D1, but this creation is not limited thereto. According to this embodiment, as shown in FIG. 1, the light collimation structure 106 may be disposed between the liquid crystal layer 112 and the second substrate 116. More specifically, the light collimation structure 106 is disposed between the color filter layer 114 and the first filter layer 114. Between the three substrates 118 and between the black matrix BM and the third substrate 118, but not limited thereto. In some embodiments, the light collimation structure 106 may also be disposed between the third substrate 118 and the second substrate 116 or between the liquid crystal layer 112 and the light sensor 108. According to this embodiment, the light collimation structure 106 may include a multilayer structure for filtering the light L1 with a larger angle after the detection light L is reflected by the finger FG, so that the light L1 cannot reach the light sensor 108, thereby improving the fingerprint recognition. effect. It should be noted that the light collimating structure “to filter the light L1 with a larger angle after the detection light L is reflected by the finger FG” may not be limited to the light collimating structure 106 shown in FIG. 1. For example, as described above, the light L1 may be a large-angle stray light directed to another light sensor located on the right side of the light sensor 108 shown in FIG. 1, so the light L1 may be corresponding to the other light sensor. The light collimation structure (not shown in FIG. 1) of the light sensor is filtered, and the fingerprint recognition effect of the other light sensor is improved, and the light collimation structure 106 shown in FIG. 1 can make an angle The smaller light L2 passes through and filters out the large-angle stray light reflected from other parts of the finger FG (not shown in Fig. 1), but is not limited thereto. For the content of filtering the stray light by the light collimation structure 106 in the following, please refer to the above content, so it will not be repeated here.

As shown in FIG. 3, in this embodiment, each pixel structure 104 corresponds to at least one opening OP defined by a black matrix BM, so that light generated by each pixel structure 104 can be emitted from the corresponding opening OP. The color filters shown in FIG. 1 can be divided into a first color filter 114a, a second color filter 114b, and a third color filter 114c, which are respectively disposed in corresponding openings OP. The first color filter The light filters 114a, the second color filter 114b, and the third color filter 114c may have different colors, respectively, so that the color of the light generated by the pixel structure 104 can be mixed into white. In the display device 100 of this embodiment, the light sensor 108 may be disposed under the second color filter, for example, so that the light sensor 108 can detect light that can pass through the second color filter. For example, the second color filter may be a green color filter, but is not limited thereto.

As shown in FIG. 3, according to this embodiment, at least a part of the light collimating structure 106 may be located in the opening OP in the direction D1 to receive the reflected light reflected from the finger. The area of the light collimation structure 106 in the direction D1 may be larger than the area of the light sensor 108 in the direction D1 to effectively block the light L1 with a larger angle. In this embodiment, each pixel structure 104 may have a display area DR for generating light, and the display area DR may be defined by the light collimation structure 106 and the black matrix BM. The area of the light collimation structure 106 may be smaller than the area of the display area DR in the direction D1. For example, the ratio of the area of the light collimation structure 106 in the direction D1 to the area of the display region DR in the direction D1 may be, for example, 0.2, 0.1, 0.05, or less, but is not limited thereto. According to this embodiment, the ratio of the area of the light collimation structure 106 in the direction D1 to the area of the display area DR in the direction D1 can be reduced as much as possible, so as to prevent the image viewed by the user from being affected by the light collimation structure 106. .

As shown in FIG. 1, the display device 100 may optionally further include a light shielding layer LS. The light-shielding layer LS is disposed below the light sensor 108. Specifically, the light-shielding layer LS is disposed between the light sensor 108 and the first substrate 102. The light shielding layer LS may overlap the light sensor 108 in the direction D1, or the light sensor 108 may cover the light shielding layer LS in the direction D1. According to this embodiment, the light-shielding layer LS can block the backlight (for example, light L3) from entering the light sensor 108 to prevent the effect of fingerprint recognition from being affected by the light L3.

Please refer to FIG. 4 and FIG. 5. FIG. 4 is a schematic cross-sectional view of a light collimation structure of a modified embodiment of the first embodiment of the creation, and FIG. 5 is a modified embodiment of the first embodiment of the creation. The relationship between the incident angle and the intensity of the outgoing light when the light passes through the light collimation structure. As shown in FIG. 4, the light collimation structure 106 in this embodiment may be a multilayer structure, where the multilayer structure may include, for example, a plurality of first film layers F1 and a plurality of second film layers F2, and the first film layers F1 and The second film layers F2 are alternately stacked, but not limited thereto. In some embodiments, the multilayer structure may be formed, for example, by alternately stacking three or more film layers, and the present invention is not limited thereto. According to this embodiment, the first film layer F1 and the second film layer F2 have different refractive indexes. For example, the first film layer F1 may include silicon oxide having a refractive index of 1.47, and the second film layer F2 may include silicon nitride having a refractive index of 1.85, but is not limited thereto. In addition, the number of layers and thickness of the multilayer structure can be changed according to different needs, and this creation is not limited to this. For example, the multilayer structure may include 11 pairs of the first film layer F1 and the second film layer F2, where the thickness of the second film layer F2 may be, for example, 74 nanometers (nm), and the middlemost first film layer F1 ( That is, the thickness of the sixth first film layer F1) calculated from above in the multilayer structure may be, for example, 187 nanometers, and the thickness of the remaining first film layer F1 may be, for example, 93 nanometers, but is not limited thereto. In addition, the light collimation structure 106 may further include a third film layer F3, where the third film layer F3 may include, for example, magnesium fluoride (MgF ₂ ), but is not limited thereto. As shown in FIG. 4, when the light ray L ′ (that is, the light ray L1 or the light ray L2 in FIG. 1) enters the light collimating structure 106, the light ray L ′ and the normal line FL of the upper surface 106 a of the light collimating structure 106 are directed. (That is, the direction D1) may have an included angle φ (that is, an incident angle). As the angle φ is different, the intensity of the outgoing light L2 ′ after the light L ′ passes through the light collimating structure 106 may also be different. For example, the x-axis in Figure 5 is the value of the included angle φ, where the included angle φ ranges from -90 degrees to 90 degrees (-90 degrees ≦ included angle φ ≦ 90 degrees), and the y-axis is the normalized light intensity. The value after normalizing. Specifically, when the value of the included angle φ is 0, the direction of travel of the light ray L ′ is the same as the direction of the normal line FL, and when the value of the included angle φ is a positive number, the light ray L ′ enters the light collimation structure 106 from the right side. When the value of the included angle φ is negative, the light ray L ′ enters the light collimation structure 106 from the left side. As shown in FIG. 5, after the light L ′ enters the light collimation structure 106 with an included angle φ of 0 degrees, the light intensity of the outgoing light L2 ′ may be the maximum. In addition, when the absolute value of the included angle φ is greater than 30 degrees (that is, the included angle φ ≧ 30 degrees or the included angle φ ≦ -30 degrees), the intensity of the emitted light L2 ′ can be reduced to 60% of the maximum light intensity, where the maximum light intensity is The above is the intensity of the emitted light L2 'when the included angle φ is 0 degrees, but it is not limited thereto. It should be noted that the color of the light L ′ may include, for example, red, green, blue, or other suitable colors, and the material and thickness of the multilayer structure and other film layers in the light collimation structure 106 may be determined according to the color of the light L ′. Design, this creation is not limited to this. It can be known from the above that when the included angle φ of the light L ′ entering the light collimation structure 106 is too large, the light L ′ may be regarded as stray light that affects fingerprint recognition (for example, the light L1 in FIG. 1, but is not limited thereto). In the embodiment, the light collimation structure 106 including the multilayer structure shown in FIG. 4 can effectively block stray light (for example, reduce the light intensity of the outgoing light L2 ′ generated after the stray light enters the light collimation structure 106) to reach the light. The sensor (ie, the light sensor 108 shown in FIG. 1), so the effect of fingerprint recognition can be effectively improved. It should be particularly noted that the light collimation structure 106 with a multilayer structure in this embodiment has a different architecture from a general optical collimator, and the cost is much lower than that of a general optical collimator, and the thickness is far. Thinner than normal cover lenses. This feature allows the light collimation structure 106 to be used in all embodiments of the present creation.

Please refer to FIG. 6 and FIG. 7. FIG. 6 is a schematic cross-sectional view of a light collimation structure according to another variation of the first embodiment of the creation, and FIG. 7 is another variation of the first embodiment of the creation. A diagram of the relationship between the incident angle and the intensity of the outgoing light when the light passes through the light collimation structure in the embodiment. As shown in FIG. 6, unlike the above-mentioned modified embodiment, the multilayer structure of the light collimation structure 106 of this modified embodiment may include a first metal layer M1, a fourth film layer F4, and a second metal layer M2, and the fourth The film layer F4 is disposed between the first metal layer M1 and the second metal layer M2. The first metal layer M1 and the second metal layer M2 may include, for example, silver, and the fourth film layer F4 may include, for example, silicon oxide, but is not limited thereto. The materials of the first metal layer M1 and the second metal layer M2 may be the same or different. The first metal layer M1 and the second metal layer M2 have a sufficiently thin thickness so that light can penetrate the first metal layer M1 and the second metal layer M2. In some embodiments, the thickness of the first metal layer M1 and the second metal layer M2 may be, for example, 25 nanometers, and the thickness of the fourth film layer F4 may be, for example, 300 nanometers, but is not limited thereto. The definition of the light ray L ', the outgoing light L2', the included angle φ (that is, the incident angle) in Fig. 6 and the x-axis and y-axis in Fig. 7 may be similar to those in Figs. Applying the principle of a thin metal thin film resonator, in this modified embodiment, when the light L ′ passes through the light collimation structure 106 shown in FIG. 6, as shown in FIG. 7, as the included angle φ is larger, the light L ′ passes The intensity of the emitted light L2 'after the light collimation structure 106 can be smaller. For example, when the light L 'enters the light collimation structure 106 with an included angle φ of 0 degrees, the light intensity of the outgoing light L2' may be the largest, and when the absolute value of the included angle φ is greater than 30 degrees (that is, the included angle φ ≧ 30 degrees or included angle φ ≦ -30 degrees), the intensity of the emitted light L2 'can be reduced to 30% of the maximum light intensity, where the maximum light intensity is the intensity of the emitted light L2' when the included angle φ is 0 degrees, But not limited to this. Therefore, the light collimating structure 106 including the multilayer structure shown in FIG. 6 in this modified embodiment can effectively block stray light from reaching the light sensor and improve the effect of fingerprint identification. It should be noted that the color of the light L ′ in this modified embodiment may include red, green, blue, or other suitable colors, and the first metal layer M1 of the multilayer structure of the light collimation structure shown in FIG. 6 The material and thickness of the fourth film layer F4 and the second metal layer M2 can be designed according to the color of the light L ′, and this creation is not limited thereto. It should be particularly noted that, in another embodiment, the fourth film layer F4 may not be limited to one layer, but may be a multilayer structure having different thicknesses or light transmittances. Similarly, the light collimation structure 106 with a double-layer thin metal film in this embodiment has a different structure from a general light collimator, and the cost is much lower than that of a general light collimator, and the thickness is far. Thinner than normal cover lenses. This feature allows the light collimation structure 106 to be used in all the embodiments of this creation.

Please refer to FIG. 8, which is a schematic cross-sectional view of a display device according to a second embodiment of the present invention. The main difference between the display device 200 of this embodiment and the first embodiment is that the light sensor 208 of the display device 200 of this embodiment is not disposed in the thin film transistor layer 210 of the pixel structure 204. As shown in FIG. 8, the light sensor 208 and the light collimation structure 206 are disposed between the liquid crystal layer 212 and the second substrate 216 of the pixel structure 204. More specifically, the light sensor 208 and the light collimation structure 206 are disposed. Between the black matrix BM and the third substrate 218, but not limited thereto. The pixel structure 204, the light sensor 208, the light collimation structure 206, and the second substrate 216 may be similar to the first embodiment, and therefore will not be repeated here. According to this embodiment, since the light sensor 208 and the light collimation structure 206 are disposed on the black matrix BM, the light sensor 208 and the light collimation structure 206 can overlap the black matrix BM in the direction D1, so that a pixel structure can be avoided The display area of 204 is limited by the light sensor 208 and the light collimation structure 206. In some embodiments, the light sensor 208 and the light collimation structure 206 may also be located between the third substrate 218 and the color filter layer 114 in the direction D1 and do not overlap the black matrix BM in the direction D1, or It partially overlaps the black matrix BM, but not limited to this. The light collimation structure 206 may overlap the light sensor 208 in the direction D1, or the light collimation structure 206 may cover the light sensor 208 in the direction D1, so it is located on the light sensor 208 in this embodiment. The light collimation structure 206 can be used to filter the light L1 with a larger angle after the detection light L is reflected by the finger FG, so that the light L1 cannot reach the light sensor 208, thereby improving the fingerprint recognition effect. Furthermore, since the light sensor 208 can be disposed on the black matrix BM in this embodiment, it is not necessary to provide a light shielding layer (such as the light shielding layer LS shown in FIG. 1) under the light sensor 208, but it is not necessary to This is limited. The light collimation structure 206 of this embodiment can be applied to the light collimation structure of any of the above-mentioned variations, and details are not described herein again.

Please refer to FIG. 9, which is a schematic cross-sectional view of a display device according to a third embodiment of the present invention. The main difference between the display device 300 of this embodiment and the first embodiment is that the light collimation structure 306 of the display device 300 of this embodiment is not disposed between the color filter layer 114 and the third substrate 118 and the black matrix BM and the first Between three substrates 118. As shown in FIG. 9, the light collimation structure 306 is disposed between the light sensor 308 and the liquid crystal layer 312. That is, the light collimation structure 306 of this embodiment is disposed in the thin film transistor layer 310. The light sensor 308 does not overlap the black matrix BM in the direction D1, and the light collimation structure 306 can cover the light sensor 308 in the direction D1. In some embodiments, the light collimation structure 306 may partially overlap the black matrix BM in the direction D1 or not overlap the black matrix BM. Therefore, the light collimation structure 306 of this embodiment can be used to filter the light L1 with a larger angle after the detection light L is reflected by the finger FG, so that the stray light L1 cannot reach the light sensor 308, thereby improving the fingerprint recognition effect. For other elements of the display device 300 in this embodiment, reference may be made to the first embodiment, and details are not described herein again.

Please refer to FIG. 10, which is a schematic cross-sectional view of a display device according to a fourth embodiment of the present invention. The main difference between the display device of this fourth embodiment and the first embodiment is that the display device 400 of this embodiment is a self-luminous display device. The other elements of the display device 400 in this embodiment may be the same as those in the first embodiment, so they are not repeated here. It should be noted that, because the pixel structure 404 of the display device 400 includes a light emitting element LU, the display device 400 may not need to be provided with a backlight module, but it is not limited thereto. Each pixel structure 404 in this embodiment may include a light emitting element LU. In addition, the pixel structure 404 may further include a thin film transistor TFT to drive the light emitting element LU. According to the present embodiment, the light sensor 408 and the light emitting element LU are disposed on the same surface of the first substrate 402. Specifically, the light sensor 408 and the light emitting element LU of this embodiment are disposed on the surface 402S of the first substrate 402, and the light sensor 408 and the light emitting element LU do not overlap in the direction D1, but this is not the case. limit. For example, the photo sensor 408 and the thin film transistor TFT may be formed from the same thin film transistor layer. The light collimation structure 406 may be disposed between the second substrate 416 and the light sensor 408. According to this embodiment, the light collimation structure 406 may be directly formed and disposed on the light sensor 408, but is not limited thereto.

Please refer to FIG. 11, which is a schematic cross-sectional view of a display device according to a modified embodiment of the fourth embodiment of the present invention. As shown in FIG. 11, in this modified embodiment, the light collimation structure 406 may be formed on the surface of the packaging glass EG, so the light collimation structure 406 may not be in contact with the light sensor 408. Furthermore, the light collimation structure 406 in this embodiment may not overlap the light emitting element LU in the direction D1, but it is not limited thereto. The other elements of the display device 400 in this embodiment may be the same as those in the first embodiment, so they are not repeated here. It should be noted that, because the pixel structure 404 of the display device 400 includes a light emitting element LU, the display device 400 may not need to be provided with a backlight module, but it is not limited thereto. In addition, the display device 400 shown in FIGS. 10 and 11 may further include a touch element TP disposed between the second substrate 416 and the packaging glass EG, but is not limited thereto.

Please refer to FIG. 12 and FIG. 13. FIG. 12 is a schematic cross-sectional view of a display device according to a fifth embodiment of the creation, and FIG. 13 is a cross-sectional schematic view of a display device according to a modified embodiment of the fifth embodiment of the creation. . In order to simplify the drawings, FIGS. 12 and 13 omit the second substrate, the polarizer, and the adhesive layer. The main difference between this fifth embodiment and the fourth embodiment is that the light sensor 508 of the display device 500 of this embodiment is not disposed on the same surface as the light emitting element LU. According to this embodiment, the pixel structure 504 of the display device 500 includes a light emitting element LU, and the first substrate 502 is disposed between the light sensor 508 and the light emitting element LU, that is, the light sensor 508 and The light emitting elements LU are located on different surfaces of the first substrate 502. In detail, the light sensor 508 is located on the surface 502S1 of the first substrate 502, and the light-emitting element LU is located on the surface 502S2 of the first substrate 502, but it is not limited thereto. According to this embodiment, the light collimation structure 506 is located between the light sensor 508 and the first substrate 502. As shown in FIG. 12, the light collimation structure 506 can be directly formed on the first substrate 502 to face the light sensor. The surface of the sensor 508, that is, the light collimation structure 506 may be disposed on the surface 502S1 of the first substrate 502, and then the light sensor 508 may be disposed on the light collimation structure 506. This is limited. It should be particularly noted that the light sensor 508 and the light collimation structure 506 may have the same area, and the light sensor 508 may also be slightly smaller than the area of the light collimation structure 506 to achieve a better stray light filtering effect.

In the modified embodiment shown in FIG. 13, the light collimation structure 506 may also be directly disposed on the light sensor 508, and then the composite structure of the light collimation structure 506 and the light sensor 508 may be disposed on the first The surface 502S1 of the substrate 502 is not limited thereto. Similar to the previous embodiment, since the light collimation structure 506 of this embodiment overlaps the light sensor 508 in the direction D1, the light can be filtered by the light collimation structure 506 before the light enters the light sensor 508. Stray light and improve the effect of fingerprint recognition. In addition, the other elements of the display structure 500 are the same as those of the fourth embodiment, so they are not repeated here.

Please refer to FIG. 14, which is a schematic cross-sectional view of a display device according to a sixth embodiment of the present invention. In order to simplify the drawing, the second substrate, the polarizer, and the adhesive layer are omitted in FIG. 14. In addition, the first substrate 602, the light-shielding layer LS, and the third substrate 618 in FIG. 14 may be the same as those in the first embodiment, and therefore are not described herein again. As shown in FIG. 14, the multilayer structure of the light collimation structure 606 of the display device 600 includes a first color filter layer 6061, a second color filter layer 6062, and a third color filter layer 6063. In this embodiment, the first color filter layer 6061, the second color filter layer 6062, and the third color filter layer 6063 can be sequentially stacked from top to bottom, but it is not limited thereto. The first color filter layer 6061, the second color filter layer 6062, and the third color filter layer 6063 can be used to absorb different colors, so that light of any color passes through the first color filter layer 6061, the second color filter layer 6062 and the third color filter layer 6063 can be completely absorbed. For example, the color of the first color filter layer 6061 may be one of red, green, or blue, the second color filter layer 6062 may be the other of red, green, or blue, and the third color filter The layer 6063 may be another one of red, green, or blue, and the stacking order of the first color filter layer 6061, the second color filter layer 6062, and the third color filter layer 6063 may be arbitrarily changed. For example, the first color filter layer 6061 may be red, the second color filter layer 6062 may be green, and the third color filter layer 6063 may be blue, or the first color filter layer 6061 may be red, The second color filter layer 6062 may be blue, and the third color filter layer 6063 may be green. This creation is not limited to this. For example, the first color filter layer 6061 may be formed at the same time as the first color filter 114a, the second color filter layer 6062 may be formed at the same time as the second color filter 114b, and the third color filter layer 6063 may be formed at the same time. It is formed at the same time as the third color filter 114c, but is not limited thereto. Therefore, when stray light with an excessively large incident angle (such as the light L ′ shown in FIG. 14) is intended to enter the light sensor 608, the light L ′ will first pass through the first color filter layer 6061 in the light collimation structure 606. The second color filter layer 6062 and the third color filter layer 6063 are all absorbed and filtered. In this way, the light L 'having an excessive incident angle can be filtered out before reaching the light sensor 608, thereby improving the effect of the light sensor 608 for fingerprint recognition. In order to ensure that the light L 'having an excessively large incident angle can be completely filtered out before reaching the light sensor 608, the light collimation structure 606 may include more than three color filter layers; that is, the light collimation structure 606 may include more than A group of three layers of different color filter layers may not be based on a group of three layers, for example, it includes four layers of color filter layers.

Please refer to FIG. 15. FIG. 15 is a schematic top view of a pixel structure of a modified embodiment of the sixth embodiment of the present invention. As shown in FIG. 15, the light collimation structure 606 (ie, the multilayer structure) may be located at least on two opposite sides of the light sensor 608 in the direction D1. In this modified embodiment, the light collimation structure 606 may be a ring structure and surround the light sensor 608 in the direction D1, but it is not limited thereto. For example, the light collimation structure 606 may have an opening 606a corresponding to an opening OP defined by the black matrix BM. The size of the opening 606a in the direction D1 in this embodiment may be approximately the same as or larger than the area of the light sensor 608 in the direction D1, and smaller than the size of the opening OP defined by the black matrix BM. In addition, the light collimation structure 606 may at least partially overlap the black matrix BM in the direction D1, and part of the light collimation structure 606 and the light sensor 608 may be disposed in the opening OP in the direction D1, but this is not the case. limit. In some embodiments, the size of the opening 606a may also be approximately the same as the size of the opening OP defined by the black matrix BM. In this way, the light L 'can be completely absorbed before reaching the light sensor 608, thereby improving the effect of the light sensor 608 for fingerprint recognition. In some embodiments, the light collimation structure 606 may also completely overlap the black matrix BM, so that the opening 606a of the light collimation structure 606 corresponds to the opening OP defined by the black matrix BM.

Please refer to FIG. 16 and FIG. 17. FIG. 16 is a schematic top view of a pixel structure of still another modified embodiment of the sixth embodiment of the present invention, and FIG. 17 is a diagram of another modified embodiment of the sixth embodiment of the author. Top view of a pixel structure. As shown in FIG. 16, in the direction D1, in addition to surrounding the light sensor 608, the light collimating structure 606 can also extend through the light sensor 608, for example. For example, the light collimation structure 606 may include a ring portion 620 and a cross portion 622, wherein the ring portion surrounds the light sensor 608, and the cross portion may overlap the light sensor 608.

In addition, as shown in FIG. 17, in the direction D1, the light collimation structure 606 may also be located on both sides of the light sensor 608 without surrounding the light sensor 608. It should be noted that the above-mentioned modified embodiments are merely exemplary, and the present invention is not limited thereto. As long as the light collimation structure 606 has the effect of filtering out stray light, it can be arranged around the light sensor 608 in any direction in the direction D1.

Please refer to FIG. 18, which is a schematic cross-sectional view of a display device according to a seventh embodiment of the present invention. The main difference between this seventh embodiment and the sixth embodiment is that the display device 700 of this embodiment further includes a photoresist structure PR. The elements in the display device 700 other than the photoresist structure PR may be the same as those in the sixth embodiment, and therefore will not be repeated here. According to the present embodiment, the photoresist structure PR may be disposed between the third substrate 718 and the light collimation structure 706 (multilayer structure). In this embodiment, the photoresist structure PR may include, for example, a material with a low refractive index, so that the refractive index of the photoresist structure PR may be smaller than the refractive index of the third substrate 718. According to this embodiment, since the photoresist structure PR is disposed between the light collimation structure 706 and the third substrate 718, when the light L3 ′ travels from the third substrate 718 toward the light sensor 708, the light L3 ′ may be caused by light. The interface between the resist structure PR and the third substrate 718 generates divergent deflections and more easily enters the first color filter layer 7061, the second color filter layer 7062, and the third color filter layer 7063 in the light collimation structure 706. , And then all are absorbed and filtered. In this way, the light L3 'can be filtered out before reaching the light sensor 708, thereby improving the effect of the light sensor 708 for fingerprint recognition.

In summary, the present invention provides a display device that includes a light collimation structure above a light sensor. The light collimation structure may include a multilayer structure, and the multilayer structure may be formed by, for example, alternately stacking a plurality of first film layers and a second film layer (which may also include a third film layer), a first metal layer, a fourth film layer It is formed by sequentially stacking with the second metal layer or by sequentially stacking the first color filter layer, the second color filter layer, and the third color filter layer. The original light collimation structure can filter stray light with a larger incident angle before being received by the light sensor, thereby improving the effect of fingerprint recognition.

100, 200, 300, 400, 500, 600, 700‧‧‧ display devices

102, 402, 502, 602‧‧‧ first substrate

104, 204, 404, 504, 604‧‧‧ pixel structure

106, 206, 306, 406, 506, 606, 706‧‧‧light collimation structure

106a‧‧‧upper surface

108, 208, 308, 408, 508, 608, 708‧‧‧ light sensors

109‧‧‧Fingerprint identification chip

110, 210, 310‧‧‧ thin film transistor layers

112, 212, 312‧‧‧ liquid crystal layer

114‧‧‧color filter

114a, 114b, 114c‧‧‧ color filters

116, 216, 416‧‧‧Second substrate

118, 218, 618, 718‧‧‧ Third substrate

402S, 502S1, 502S2‧‧‧ surface

6061, 7061‧‧‧‧The first color filter layer

6062, 7062‧‧‧‧Second color filter layer

6063, 7063‧‧‧‧th third color filter layer

620‧‧‧Ring

622‧‧‧Across

BL‧‧‧ backlight module

BM‧‧‧Black Matrix

D1‧‧‧ direction

DE‧‧‧pixel electrode

DR‧‧‧Display Area

EG‧‧‧Packaging glass

F1‧‧‧The first film layer

F2‧‧‧Second film layer

F3‧‧‧ third film

F4‧‧‧Fourth film layer

FG‧‧‧finger

FL‧‧‧ Normal

L‧‧‧detection light

L1, L2, L3, L ’, L3’‧‧‧ Light

L2’‧‧‧ exit light

LS‧‧‧Light-shielding layer

LU‧‧‧Light-emitting element

M1‧‧‧First metal layer

M2‧‧‧Second metal layer

PR‧‧‧Photoresistive structure

TFT‧‧‧ thin film transistor

TP‧‧‧touch element

OP, 606a‧‧‧ opening

φ‧‧‧ angle

FIG. 1 is a schematic cross-sectional view of a display device according to a first embodiment of the present invention.
FIG. 2 is a functional block diagram of the display device according to the first embodiment of the present invention.
FIG. 3 is a schematic top view of the pixel structure of the first embodiment of the creation.
FIG. 4 is a schematic cross-sectional view of a light collimation structure according to a modified embodiment of the first embodiment of the invention.
FIG. 5 is a relationship diagram between the incident angle and the intensity of the emitted light when the light passes through the light collimating structure in a modified embodiment of the first embodiment of the creation.
FIG. 6 is a schematic cross-sectional view of a light collimation structure according to another modified embodiment of the first embodiment of the invention.
FIG. 7 is a relationship diagram between the incident angle and the intensity of the outgoing light when the light passes through the light collimating structure in another modified embodiment of the first embodiment of the creation.
FIG. 8 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention.
FIG. 9 is a schematic cross-sectional view of a display device according to a third embodiment of the present invention.
FIG. 10 is a schematic cross-sectional view of a display device according to a fourth embodiment of the present invention.
FIG. 11 is a schematic cross-sectional view of a display device according to a modified embodiment of the fourth embodiment.
FIG. 12 is a schematic cross-sectional view of a display device according to a fifth embodiment of the present invention.
FIG. 13 is a schematic cross-sectional view of a display device according to a modified embodiment of the fifth embodiment.
FIG. 14 is a schematic cross-sectional view of a display device according to a sixth embodiment of the present invention.
FIG. 15 is a schematic top view of a pixel structure of a modified embodiment of the sixth embodiment of the invention.
FIG. 16 is a schematic top view of a pixel structure according to another variation of the sixth embodiment of the present invention.
FIG. 17 is a schematic top view of a pixel structure of still another modified embodiment of the sixth embodiment of the invention.
FIG. 18 is a schematic cross-sectional view of a display device according to a seventh embodiment of the present invention.

Claims (19)

A display device with a pixel structure is used to detect a fingerprint of a finger. The display device includes:
A first substrate
A light sensor disposed on the first substrate; and a light collimation structure corresponding to the light sensor and disposed between the light sensor and the finger;
Wherein, the light collimation structure includes a multilayer structure for filtering a reflected light reflected by the finger. The display device according to claim 1, wherein the light collimation structure overlaps the light sensor in a vertical direction, and the multilayer structure includes a plurality of first film layers and a plurality of second film layers, each of which The first film layer and each of the second film layers are alternately stacked, and each of the first film layer and each of the second film layers have different refractive indexes. The display device according to claim 1, wherein the light collimation structure overlaps the light sensor in a vertical direction, and the multilayer structure includes a first metal layer, a third film layer, and a second metal Layer, and the third film layer is disposed between the first metal layer and the second metal layer. The display device according to claim 1, further comprising a second substrate opposite to the first substrate, wherein the pixel structure includes a thin film transistor layer, a liquid crystal layer, and a color filter layer, the thin film transistor layer The color filter layer is disposed between the liquid crystal layer and the first substrate, the color filter layer is disposed between the liquid crystal layer and the second substrate, and the light sensor is located in the thin film transistor layer. The display device according to claim 4, wherein the light collimation structure is disposed between the light sensor and the liquid crystal layer. The display device according to claim 4, wherein the light collimation structure is disposed between the liquid crystal layer and the second substrate. The display device according to claim 1, further comprising a second substrate opposite to the first substrate, wherein the pixel structure includes a thin film transistor layer, a liquid crystal layer, and a color filter layer, the thin film transistor layer The color filter layer is disposed between the liquid crystal layer and the first substrate, the color filter layer is disposed between the liquid crystal layer and the second substrate, and the light sensor and the light collimation structure are disposed between the liquid crystal layer and the first substrate. Between two substrates. The display device according to claim 1, wherein the pixel structure includes a light emitting element, and the light sensor and the light emitting element are disposed on a same surface of the first substrate. The display device according to claim 1, wherein the pixel structure includes a light emitting element, and the first substrate is disposed between the light sensor and the light emitting element. The display device according to claim 9, wherein the light collimation structure is directly formed on a surface of the first substrate facing the light sensor. The display device according to claim 9, wherein the light collimation structure is directly formed on the light sensor. The display device according to claim 1, wherein in a vertical direction, the multilayer structure is located at least on opposite sides of the light sensor, and the multilayer structure includes a first color filter layer and a second color filter Layer and a third color filter layer, and the first color filter layer, the second color filter layer and the third color filter layer are sequentially stacked. The display device according to claim 12, wherein the first color filter layer, the second color filter layer, and the third color filter layer are used to absorb different colors. The display device according to claim 12, wherein the multilayer structure surrounds at least the light sensor in the vertical direction. The display device according to claim 13, further comprising a photoresist structure and a second substrate, wherein the photoresist structure is disposed on the multilayer structure and the second substrate, and a refractive index of the photoresist structure is less than the first The refractive index of the two substrates. A fingerprint recognition chip is used to detect a fingerprint of a finger in a display device. The display device includes a light sensor and a light collimation structure. The light collimation structure is disposed on the light sensor and the finger. between;
Wherein, the light collimation structure includes a multilayer structure for filtering a reflected light reflected by the finger; wherein the fingerprint recognition chip is electrically connected to the light sensor, and a fingerprint is drawn using the filtered reflected light The pattern is compared with a known fingerprint pattern to achieve the identification function. The fingerprint recognition chip according to claim 16, wherein the light collimation structure overlaps the light sensor in a vertical direction, and the multilayer structure includes a plurality of first film layers and a plurality of second film layers, each The first film layer and each of the second film layers are alternately stacked, and each of the first film layer and each of the second film layers have different refractive indexes. The fingerprint identification chip according to claim 16, wherein the light collimation structure overlaps the light sensor in a vertical direction, and the multilayer structure includes a first metal layer, a third film layer, and a second A metal layer, and the third film layer is disposed between the first metal layer and the second metal layer. The fingerprint identification chip according to claim 16, wherein the multilayer structure is located at least on opposite sides of the light sensor in a vertical direction, and the multilayer structure includes a first color filter layer and a second color filter A light layer and a third color filter layer, and the first color filter layer, the second color filter layer and the third color filter layer are sequentially stacked.