TWM587287U - Display device and integrated control chip - Google Patents

Abstract

A display device and an integrated control chip are provided and used for detecting a fingerprint of a finger. The display device has a display region. The display device includes a light source, a liquid crystal panel and a plurality of photo sensors. The liquid crystal panel is disposed on the source, the liquid crystal panel includes a first electrode layer, a liquid crystal layer and a second electrode layer, and the liquid crystal layer is disposed between the first electrode layer and the second electrode layer, in which the first electrode layer includes at least one first electrode disposed in the display region, and the first electrode has a plurality of openings. Each photo sensor respectively corresponds to one of the openings.

Description

Display device and integrated control chip

This creation relates to a display device and an integrated control chip, especially a display device and an integrated control chip with a fingerprint recognition function.

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 do not have light transmission, which limits the screen ratio of the display device. For this reason, the industry has developed an under-screen fingerprint sensor, such as an optical fingerprint sensor, which enables it to detect a fingerprint image without affecting the screen ratio. Currently, the display device of the mainstream technology with an optical fingerprint sensor is an organic light emitting diode display device. The organic light emitting diode display device itself is used as a light source to generate detection light to illuminate the finger, so that the optical fingerprint sensor can detect Get fingerprint images from the light reflected from your fingers. However, the light reflected by the finger will diverge into a plurality of reflected light, causing the optical fingerprint sensor to receive reflected light corresponding to fingerprints at different positions of the finger, making the image detected by the fingerprint recognition device poor, which will affect the result of fingerprint recognition. . Therefore, a collimator is usually provided on the fingerprint sensor to filter out the reflected light having a larger incident angle. However, if a collimator is used in a liquid crystal display device, the brightness of the display device will be greatly reduced, and the image cannot be displayed normally. Therefore, the combination of the collimator provided on the fingerprint sensor can only be applied to expensive organic light emitting diodes. In the bulk display device, the cost of the overall display device cannot be further reduced.

An embodiment of the present invention provides a display device for detecting a fingerprint of a finger. The display device has a display area. The display device includes a light source, a liquid crystal panel, and a plurality of light sensors. The liquid crystal panel is disposed on a light source. The liquid crystal panel includes a first electrode layer, a liquid crystal layer, and a second electrode layer. The liquid crystal layer is disposed between the first electrode layer and the second electrode layer. The first electrode layer includes at least A first electrode is disposed in the display area. The first electrode has a plurality of openings. The light sensors correspond to one of the openings, respectively.

Another embodiment of the present invention provides a display device for detecting a fingerprint of a finger. The display device has a display area. The display device includes a liquid crystal display panel, a light source, a partial adjustment structure, and a plurality of light sensors. The light source is arranged under the liquid crystal display panel. The local adjustment structure is disposed between the light source and the liquid crystal display panel. The local adjustment structure includes a first electrode layer, a liquid crystal layer, and a second electrode layer. When the display device performs fingerprint recognition, the display area where the finger is close to or touched is A fingerprint recognition area, and a haze of a part of the local adjustment structure located in the fingerprint recognition area is smaller than a haze of another part of the local adjustment structure located outside the fingerprint recognition area. The light sensor is disposed in a display area of the liquid crystal display panel.

Yet another embodiment of the present invention provides an integrated control chip integrated into a display device. The display device includes a light source, a liquid crystal panel disposed on the light source, and a plurality of light sensors. An integrated control chip is used to control the light source, the liquid crystal panel and the light sensor. The liquid crystal panel has a display area and the light sensor. Set in the display area. The integrated control chip includes a touch display control element and a fingerprint identification control element. The touch display control element is used to determine the display area close to or touched by the finger as the fingerprint identification area when the finger is close to or touches the display area in the fingerprint identification mode. The fingerprint identification control element is used to perform a fingerprint identification step in the fingerprint identification mode, wherein the fingerprint identification step includes adjusting the liquid crystal molecules of the liquid crystal panel located in the fingerprint identification area, so that at least a part of the liquid crystal panel located in the fingerprint identification area is light-transmissive. The light generated by the light source is allowed to pass through at least a part of the liquid crystal panel and be directed to the finger, wherein the finger reflects the light as a reflected light; and the light sensor detects the reflected light reflected from the finger to obtain a fingerprint image of the finger.

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.

The ordinal numbers used in the description and the request items, such as "first", "second", etc., to modify the elements of the request item, do not themselves imply and represent that the request element has any previous ordinal number, nor does it mean The order of a requesting element and another requesting element, or the order of manufacturing methods, the use of these ordinal numbers is only used to make a requesting element with a certain name clearly distinguishable from another requesting element with the same name .

It should be noted that the technical solutions provided by different embodiments below can be replaced, combined, or mixed with each other, so as to constitute another embodiment without violating the spirit of the present disclosure.

The display device provided by this creation generates a relatively collimated detection light through a part of it, used to detect the image of the fingerprint, so that the reflected light reflected from the finger can also be more collimated, so the light in the display device located in the display area The sensor can detect a clear image of the fingerprint, so as to detect the fingerprint without affecting the screen ratio.

Please refer to FIG. 1 to FIG. 3. FIG. 1 is a schematic top view of the display device of the first embodiment of the creation, and FIG. 2 is a schematic top view of the display device of the first electrode corresponding to the first embodiment of the creation. FIG. 3 is a schematic cross-sectional view taken along section line AA ′ of FIG. 2. For the sake of clarity, FIG. 2 only illustrates the plan view relationship between the first electrode and the color filter layer. As shown in FIG. 1, the display device 11 provided in this embodiment has a display area DR for displaying an image, and the display area DR has a fingerprint recognition area FR for detecting a fingerprint of the finger F. For example, the fingerprint recognition area FR may be an area that can be completely covered by the finger F, that is, an area where fingerprint recognition is performed on the finger F within a certain period of time. In this embodiment, the finger F may be singular or plural. In this embodiment, the fingerprint recognition area FR is not located in a specific area in the display area DR, but is an arbitrary area in which the finger F is close to or touched in the display area DR. That is to say, the display device 11 of this embodiment is a fingerprint on display (FOD) display device. The fingerprint of the finger F can be detected in any area of the display area DR, that is, any area of the display area DR. The areas are all potential fingerprint recognition areas. In other embodiments, the fingerprint recognition area FR is limited to a part of the display area DR, that is, the potential fingerprint recognition area is limited to a part of the display area DR. The display device 11 of this embodiment may also have a non-display area NDR, which is located on at least one side of the display area DR. For example, the display area DR may surround the display area DR, but is not limited thereto. The non-display area NDR may be used to set peripheral elements or Opaque element. In some embodiments, since the fingerprint recognition area FR is located in the display area DR, the display device 11 may not have the non-display area NDR, that is, it has a borderless feature. In this context, “proximity” refers to the distance that the display device 11 can detect the fingerprint of the finger F when the finger F has not touched the display device 11. For example, the distance that the display device 11 can detect the fingerprint of the finger F may be smaller than the width of the finger F, but is not limited thereto.

As shown in FIGS. 1 to 3, the display device 11 includes a light source 102, a liquid crystal panel 104, and a plurality of light sensors 106. The light source 102 can be used to generate light L1, and the liquid crystal panel 104 is disposed on the light source 102 to control whether the light L1 is allowed to penetrate, so that the light L2 emitted from the light emitting surface 104S of the liquid crystal panel 104 can be used for displaying or detecting fingerprints. . The liquid crystal panel 104 includes a first electrode layer 108, a liquid crystal layer 110, and a second electrode layer 112. The liquid crystal layer 110 is disposed between the first electrode layer 108 and the second electrode layer 112, and includes liquid crystal molecules 110L. The amount of light L1 passing through the liquid crystal panel 104 can be adjusted by controlling the deflection direction of the liquid crystal molecules 110L. The first electrode layer 108 includes at least one first electrode 108E1 disposed in the fingerprint recognition area FR. The first electrode 108E1 has a plurality of openings OP for allowing light L1 to pass through during fingerprint detection. In this embodiment, the first electrode layer 108 may include a plurality of first electrodes 108E1 having an opening OP, which are insulated from each other and disposed in the display area DR. Each light sensor 106 may correspond to one of the openings OP. When the display device 11 is performing fingerprint recognition, by providing a voltage difference between the first electrode 108E1 and the second electrode layer 112 or the first electrode 108E1 and the third electrode layer 114, the liquid crystal molecules 110L corresponding to the first electrode 108E1 can be rotated. In the dark state (that is, the light L1 cannot pass through the liquid crystal panel 104), for example, it is rotated to a vertical alignment, and the liquid crystal molecules 110L corresponding to the opening OP are not rotated into a dark state (that is, the light L1 can pass through the liquid crystal panel 104), for example, it is still horizontally aligned Therefore, the light L1 generated by the light source 102 can only penetrate through the liquid crystal panel 104 corresponding to the opening OP, and then collimate the light L2 emitted from the light emitting surface 104S of the liquid crystal panel 104. Thereby, the reflected light L3 received by the light sensor 106 corresponding to different fingerprint positions can be reduced, so as to improve the detected image quality and the accuracy of fingerprint recognition.

Specifically, as shown in FIG. 3, the liquid crystal panel 104 in this embodiment may be, for example, a liquid crystal display panel. Therefore, the light source 102 may include, for example, a backlight module for generating planar light L1. The backlight module may be, for example, a side-type or a direct-type. When the backlight module is a direct type, the backlight module may include, for example, a plurality of light emitting diodes arranged below the liquid crystal panel 104, but the present invention is not limited thereto. In addition, the liquid crystal panel 104 of this embodiment may further include a third electrode layer 114 and an insulating layer 116, and the second electrode layer 112 is disposed between the liquid crystal layer 110 and the third electrode layer 114, and the insulating layer 116 is disposed at the first The two electrode layers 112 and the third electrode layer 114 are used to electrically insulate the second electrode layer 112 and the third electrode layer 114. The second electrode layer 112 includes a plurality of second electrodes 112E, and each of the second electrodes 112E may have at least one slit SL. The third electrode layer 114 is exposed in the plan direction TD of the display device 11, and therefore, the second electrode 112E passes through the second electrode. A voltage difference provided between 112E and the third electrode layer 114 can generate a horizontal electric field in the liquid crystal layer 110, thereby controlling the deflection of the liquid crystal molecules 110L in the liquid crystal layer 110, so that the display device 11 can display an image. In other words, the liquid crystal display panel of this embodiment may be, for example, a fringe field switching type. For example, the second electrode 112E can be used as a pixel electrode and the third electrode layer 114 can be used as a common electrode, but the present invention is not limited thereto. In some embodiments, the third electrode layer 114 may also include a plurality of electrodes, respectively corresponding to a second electrode 112E. In this case, one of the second electrode 112E and the electrode may be a pixel electrode, and the other may be a pixel electrode. Common electrode. In some embodiments, the second electrode layer 112 may also include the second electrode 112E having the slit SL and the electrode having the slit, and the slit SL of the second electrode 112E and the slit of the electrode are in the top view direction TD. They are staggered from each other, that is, the liquid crystal display panel can be a type of in-plane switching. In some embodiments, the liquid crystal display panel may also be other types, such as a vertical aligned (VA) type or a multi-domain vertical aligned (MVA) type.

In addition to the first electrode layer 108, the liquid crystal layer 110, the second electrode layer 112, the third electrode layer 114, and the insulating layer 116, the liquid crystal panel 104 of this embodiment may further include a first substrate 118, a thin film transistor layer 120, The color filter layer 122, the black matrix layer 124, and the second substrate 126. The first substrate 118 and the second substrate 126 are disposed opposite to each other, and the liquid crystal layer 110 is disposed between the first substrate 118 and the second substrate 126. In this embodiment, the thin film transistor layer 120, the third electrode layer 114, the insulating layer 116, and the second electrode layer 112 may be sequentially formed on the first substrate 118, and each of the second electrodes 112E may be electrically connected to the thin film. A corresponding thin film transistor (not shown) in the transistor layer 120. In some embodiments, when the third electrode layer 114 includes an electrode, the electrode may be electrically connected to a corresponding line (for example, a common line), but is not limited thereto. Since the elements included in the thin film transistor layer 120, such as a thin film transistor, a storage capacitor, a data line or a scan line, and their electrical connection methods are well known to those skilled in the art, and there are many types of variations, so here Not much more.

In addition, in this embodiment, the color filter layer 122 may be disposed between the second substrate 126 and the liquid crystal layer 110, the black matrix layer 124 may also be disposed between the second substrate 126 and the liquid crystal layer 110, and the first electrode The layer 108 may be located between the color filter layer 122 and the liquid crystal layer 110 and between the black matrix layer 124 and the liquid crystal layer 110. For example, the color filter layer 122, the black matrix layer 124, and the first electrode layer 108 may be sequentially formed on the second substrate 126, but it is not limited thereto. In some embodiments, the black matrix layer 124 may also be disposed between the color filter layer 122 and the second substrate 126, or the color filter layer 122 is formed in the opening 124a of the black matrix layer 124. Further, the color filter layer 122 in this embodiment may include a plurality of first color filters 122a, a plurality of second color filters 122b, and a plurality of third color filters 122c, which are disposed on the first electrode. Layer 108. The first color filter 122a, the second color filter 122b, and the third color filter 122c may have different colors, respectively, so that the first color filter 122a, the second color filter 122b, and the third color filter pass through. The light of the color filter 122c can be mixed into white light. For example, one first color filter 122a, one second color filter 122b, and one third color filter 122c arranged side by side may correspond to the same pixel of a liquid crystal display panel. In addition, the first color filter 122a may be, for example, a red filter, the second color filter 122b may be, for example, a green filter, and the third color filter 122c may be, for example, a blue filter, but not Limited to this.

Please continue to refer to FIG. 2. In this embodiment, the openings OP of the first electrode 108E1 can respectively correspond to the first color filter 122 a, the second color filter 122 b, or the third color filter in the plan direction TD. One of the sheets 122c allows the light L2 for detecting fingerprints to have the same color. The size of the opening OP may be smaller than that of the corresponding color filter, but is not limited thereto. For example, since red light is easily absorbed by the human body and blue light easily affects the light sensor 106, the opening OP of the first electrode 108E1 may correspond to a green filter, but is not limited thereto. In some embodiments, each of the openings OP of the first electrode 108E1 may correspond to or overlap the first color filter 122a, the second color filter 122b, and the third color filter of the same pixel in the top view direction TD, respectively. At least two of the sheets 122c. In addition, the first electrode 108E1 of this embodiment may overlap the plurality of first color filters 122a, the plurality of second color filters 122b, and the plurality of third color filters 122c in a plan view TD, but not Limited to this. In addition, the black matrix layer 124 may have a plurality of openings 124a corresponding to one sub-pixel, respectively. For example, the first color filter 122a, the second color filter 122b, and the third color filter 122c may correspond to one opening 124a, as shown in FIG. 3, in other words, the first color filter 122a The second color filter 122b and the third color filter 122c may respectively cover the corresponding openings 124a.

As shown in FIG. 3, each light sensor 106 may respectively correspond to an opening OP of the first electrode 108E1. For example, in a plan view direction TD of the display device 11, each light sensor 106 is disposed or provided adjacent to the corresponding opening OP. In the corresponding opening OP. In this embodiment, each of the light sensors 106 may be respectively disposed in an opening 124 a of the black matrix layer 124. For example, the light sensor 106 may be disposed in the opening 124a corresponding to the second color filter 122b and located between the second color filter 122b and the first electrode 108E1, but is not limited thereto. The position of the light sensor 106 can be determined according to the color of light to be received. In some embodiments, the light sensor 106 may also be disposed on any layer (horizontal plane) between the black matrix layer 124 and the second substrate 126, for example, the same layer as the black matrix layer 124, or the thin film transistor layer 120. in. The light sensor 106 may be, for example, a photodiode or a phototransistor, but is not limited thereto.

In this embodiment, the liquid crystal panel 104 may further include an adhesive layer 128, an upper polarizer 130, and a lower polarizer (not shown). The upper polarizer 130 may be adhered to the upper surface of the second substrate 126 through the adhesive layer 128. The upper and lower polarizers can be attached to the lower surface of the first substrate 118 through another adhesive layer (not shown). In order to clearly display the display device 11, the lower polarizer and the adhesive layer are omitted in FIG. 3, but this creation is not limited to this. The liquid crystal panel 104 can reach a bright state and a dark state through the polarization directions of the upper polarizer 130 and the lower polarizer and the arrangement direction of the liquid crystal molecules 110L. The polarization directions of the upper polarizer 130 and the lower polarizer can be adjusted according to actual needs. In addition, the display device 11 may further include an adhesive layer 132 and a cover plate 134, wherein the cover plate 134 is adhered to the polarizer 130 through the adhesive layer 132. In some embodiments, the liquid crystal panel 104 may further include a spacer SP disposed in the liquid crystal layer 110 to maintain the thickness of the liquid crystal layer 110.

Please continue to refer to Figure 1 and Figure 2. The first electrodes 108E1 in this embodiment may be distributed in the entire display area DR. Therefore, a part of the first electrodes 108E1 are disposed in the display area DR outside the potential fingerprint recognition area that can be used as the fingerprint recognition area FR. For example, the first electrode 108E1 can form a touch element, so that the first electrode 108E1 can detect the position of the finger when it is close to or touches the display device 11. In this embodiment, the first electrodes 108E1 can be arranged in a matrix manner, and are electrically connected to the touch control elements through wires insulated from each other. In other words, the first electrodes 108E1 in this embodiment can form a self-capacitive touch element, but Not limited to this. Since each of the first electrodes 108E1 in this embodiment is used as a touch electrode, it may overlap with a plurality of second electrodes 112E as pixel electrodes in the top view direction TD, but it is not limited thereto. The number of overlapping of the second electrode 112E and the single first electrode 108E1 can be adjusted correspondingly according to the display resolution and the touch resolution required by the display device 11.

The driving method of the display device of this embodiment will be further described below. Please refer to FIG. 4 and FIG. 5, and refer to FIG. 1 and FIG. 3 together. FIG. 4 shows the synchronization signal, the driving signal of the third electrode, and the first electrode of the liquid crystal panel of the first embodiment of the creation. FIG. 5 is a timing diagram of the driving signal of FIG. 5. FIG. 5 is a schematic diagram of displaying images by the display device according to the first embodiment of the present invention. As shown in FIGS. 4 and 5, the signal provided by the display device 11 to the liquid crystal panel 104 is the synchronization signal S1 and is provided in an area (for example, at least a part of an area covered by the finger F) located in the fingerprint recognition area FR. The signal of the first electrode 108E1 is the driving signal S2, and the signal of the first electrode 108E1 provided outside the area determined as the fingerprint recognition area FR is the driving signal S3. In this embodiment, the synchronization signal S1 may be, for example, a synchronization signal in the vertical direction of the display screen, that is, a vertical synchronization signal (Display V-Sync), and is provided to the LCD panel 104 to indicate a frame time and provide synchronization. To scan lines and data lines. In each picture period T1 and T2, the display device 11 displays a corresponding picture, wherein the picture periods T1 and T2 may respectively have a display driving period DT1 and DT2 and an interval period BT1 and BT2. The interval periods BT1 and BT2 may be, for example, A vertical blank period. During the display driving period DT1, the synchronization signal S1 provided to the liquid crystal panel 104 may be at a high level, and the driving signal S2 provided to the first electrode 108E1 in the fingerprint recognition area FR and the first electrode 108E1 outside the fingerprint recognition area FR. The driving signals S3 are all low-level, so the liquid crystal molecules 110L can exhibit horizontal alignment, so that the light L2 emitted from the light emitting surface 104S of the liquid crystal panel 104 can present an image. In the interval period BT1, the synchronization signal S1 provided by the display device 11 is at a low level and the display signal Sx is at a high level, so that the liquid crystal panel 104 continuously displays the same picture in the interval period BT1. At the same time, in the interval BT1, the driving signal S2 provided to the first electrode 108E1 in the fingerprint recognition area FR and the driving signal S3 provided to the first electrode 108E1 outside the fingerprint recognition area FR can both be at a high level, so that the first An electrode 108E1 can detect whether a finger touches the display device 11. The display signal Sx may be, for example, a data enable (DE) signal.

Next, as shown in FIG. 3 and FIG. 4, in the display driving period DT2 of entering the frame period T2 of displaying the next screen, when the display device 11 intends to perform fingerprint recognition, the driving signal S2 provided to the first electrode 108E1 It can be maintained at a high level, until the image of the fingerprint is detected, and then dropped to a low level, that is, the fingerprint detection is stopped. Because the finger F touches the fingerprint recognition area FR of the display device 11 (for example, at least a part of the area covered by the finger F), the user cannot see the image of the fingerprint recognition area FR, so the driving signal S2 is maintained at Micro Motion during the display driving period DT2. The position does not affect the image viewed by the user. When the driving signal S2 is maintained at a high level, a voltage difference will be generated between the first electrode 108E1 and the second electrode 112E below it and / or the first electrode 108E1 and the third electrode layer 114, so that the liquid crystal molecules 110L are deflected to Dark state. For example, the long axis of the liquid crystal molecules 110L can be rotated to a vertical alignment, such as parallel to the top view direction TD. Since the first electrode 108E1 has an opening OP, the liquid crystal molecules 110L corresponding to the opening OP will not be deflected to a dark state, for example, they are still horizontally aligned. Therefore, the light L1 from the light source 102 can penetrate the display device 11 corresponding to the opening OP as an The detection light (for example, light L2), and the traveling direction of the detection light may be close to the normal direction of the display surface 1a of the display device 11 (for example, the top direction TD), thereby improving the collimation of the detection light. In this way, the mutual interference of the reflected light L3 of the detection light passing through the adjacent opening OP after being reflected by the finger can be reduced, so as to improve the sharpness of the image detected by the light sensor 106.

Furthermore, as shown in FIGS. 1 and 4, the driving signal S3 provided to the first electrode 108E1 located outside the fingerprint recognition area FR is at a low level during the display driving period DT2, so the display located outside the fingerprint recognition area FR Zone DR can still display the picture normally. That is, the display area DR can display the screen normally except the area covered with the finger F and the fingerprint recognition of the finger F within a certain period of time. In addition, when the display device 11 does not perform fingerprint recognition, the driving signal S2 provided to the first electrode 108E1 is at a low level in other driving periods (for example, the display driving period DT3), so that the fingerprint recognition area FR of the display device 11 can be An image is displayed, as shown in FIG. 5, so the entire display area DR of the display device 11 can display a complete image.

It can be known from the foregoing that the display device 11 of this embodiment not only uses the liquid crystal panel 104 as a device for displaying an image, but also detects light that penetrates the liquid crystal panel 104 through collimation, so that the light sensor 106 of the display device 11 can detect A clear fingerprint image is detected, so the display device 11 can have a fingerprint recognition function. Thereby, the overall cost of the display device 11 can be effectively reduced.

The display device of the present invention is not limited to the above embodiments. In order to facilitate the comparison of the differences between the first embodiment and other embodiments and to simplify the description, the same symbols are used in other embodiments below to designate the same elements, and are mainly directed to the differences between the first embodiment and other embodiments. The differences will be explained without repeating the repeated parts.

Please refer to FIG. 6, which illustrates a schematic top view of a display device according to a modified embodiment of the first embodiment of the present invention. As shown in FIG. 6, the difference between this modified embodiment and the above embodiment is that a part of the first electrode 108E1 of the display device 12 may be replaced with a third electrode 108E2 without an opening, and the third electrode 108E2 is provided in the display area DR. . Since the third electrode 108E2 does not have an opening, the portion of the display device 12 corresponding to the third electrode 108E2 cannot be fingerprinted. In other words, the display area DR corresponding to the third electrode 108E2 does not have a fingerprint identification function. In this modified embodiment, the distribution range of the third electrode 108E2 may be determined according to the installation area of the first electrode 108E1. For example, the distribution range of the first electrode 108E1 is a potential fingerprint recognition area that can be used as the fingerprint recognition area FR, and the third electrode 108E2 is disposed outside the potential fingerprint recognition area, but is not limited thereto. The third electrode 108E2 may be formed of the first electrode layer 108, for example. In the plan direction TD, the first color filter 122a, the second color filter 122b, and the third color filter 122c may completely overlap the third electrode 108E2, for example. The outline size of the third electrode 108E2 may be the same as the outline size of the first electrode 108E1, but is not limited thereto. In the driving method of the display device 12 according to this modified embodiment, the third electrode 108E2 provides a driving signal S3. Since the first electrode 108E1 and the driving signal provided in this modified embodiment are the same as those in the above embodiment, they will not be repeated here.

Please refer to FIG. 7, which illustrates a schematic diagram of a fingerprint identification method of a display device according to a second embodiment of the present invention. As shown in FIG. 7, the display device 2 provided in this embodiment may include a liquid crystal display panel 204 and a light source 102. The liquid crystal display panel 204 of this embodiment may be any type of liquid crystal display panel, such as a liquid crystal display panel of a vertical alignment type or a lateral electric field switching type, but is not limited thereto. For example, the liquid crystal display panel 204 may include a color filter substrate 2041, a thin film transistor substrate 2042, a liquid crystal layer 110, an upper polarizer 230, and a lower polarizer 216. The liquid crystal layer 110 is disposed on the color filter substrate 2041 and a thin film. Between the transistor substrate 2042, the upper polarizer 230 and the lower polarizer 216 are respectively disposed on the light exit surface 204S1 and the light entrance surface 204S2 of the liquid crystal display panel 204. In addition, the liquid crystal display panel 204 may include a plurality of pixels PX1, PX2, and each pixel PX1, PX2 may include, for example, sub-pixels SPX1, SPX2, and SPX3, respectively. The number of sub-pixels SPX1, SPX2, and SPX3 in each pixel PX1 and PX2 in this creation is not limited to this. In this embodiment, when the display device 2 performs fingerprint recognition, a part of non-adjacent pixels PX1 located in the fingerprint recognition area FR may be turned on, and another part of non-adjacent pixels PX2 may be turned off, so that the fingerprint recognition area FR is in the fingerprint recognition area FR. The liquid crystal layer 110 of the pixels PX1 and PX2 may form a grating 110G. In other words, the pixels PX1 that are turned on and the pixels PX2 that are turned off are sequentially alternately arranged. In this way, the size of the opening 110a of the grating 110G and the distance between the openings 110a can be used to reduce the divergence angle θ of the light penetrating the liquid crystal display panel 204, thereby reducing the incident angle of the reflected light into the light sensor, thereby effectively improving Detect the collimation of light. The width of the on-pixel PX1 and the width of the off-pixel PX2 may be, for example, 60 micrometers, but are not limited thereto. For example, the number of pixels PX1 between adjacent and closed pixels PX2 may be one, and the number of pixels PX2 between adjacent and open pixels PX1 may be one. Therefore, with a single point light source, a point The divergence angle θ of the light generated by the light source may be less than 11 degrees, but is not limited thereto. The divergence angle θ of the light, the width of the open pixel PX1 and the width of the closed pixel PX2 can be adjusted by changing the number of pixels PX1 between adjacent and closed pixels PX2 and the number of pixels PX2 between adjacent and open pixels PX1. . In some embodiments, the display device 2 may optionally further include a touch element and a cover plate disposed on the liquid crystal display panel 204.

Please refer to FIG. 8, which illustrates a schematic diagram of a fingerprint recognition method of a display device according to a modified embodiment of the second embodiment of the present invention. As shown in FIG. 8, this modified embodiment is different from the foregoing embodiment in that the display device 2 provided in this modified embodiment only enables non-adjacent sub-pixels SPX2 in the fingerprint recognition area FR when performing fingerprint recognition. And turn off the other sub-pixels SPX1 and SPX3 to form the grating 110G. Since only the width W of the single sub-pixel SPX2 allows light to pass through in this variation, the width of the opening 110a of the grating 110G can be reduced to reduce the divergence angle of the light passing through the liquid crystal display panel 204. For example, a single point light source In other words, the divergence angle θ of the light generated by the point light source can be reduced to less than 4 degrees. This can effectively improve the collimation of the detection light. In this modified embodiment, the turned-on sub-pixels SPX2 may all be sub-pixels that generate the same color, such as green sub-pixels. In addition, there may be at least two closed sub-pixels between adjacent and turned-on green sub-pixels SPX2, such as the sub-pixels SPX1 and SPX3. In this modified embodiment, when fingerprint identification is performed, the green sub-pixel SPX2 that is turned on is not the adjacent green sub-pixel SPX2, but a green sub-pixel SPX2 that is turned off is set in between, and other red sub-pixels SPX1 or The blue sub-pixel SPX3 can be turned off, but not limited to this. In some embodiments, as the distance between two adjacent sub-pixels SPX2 being turned on is larger (or the number of sub-pixels is larger), the mutual interference of the detection lights emitted from the two adjacent sub-pixels SPX2 may be reduced. To improve the quality of the detected image. For example, there may be at least four sub-pixels between two adjacent sub-pixels SPX2 that are turned on.

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. As shown in FIG. 9, the display device 31 provided in this embodiment is different from the display device 11 shown in FIG. 3 in that the liquid crystal panel 304 of the display device 31 is used for collimating detection light, and another A liquid crystal display panel 340 is included between the light source 102 and the liquid crystal panel 304 for displaying images. Specifically, the liquid crystal panel 304 of this embodiment may include only the second substrate 126, the first electrode layer 308, the liquid crystal layer 110, the second electrode layer 312, and the first substrate 118, but does not include a thin film transistor layer, a third An electrode layer, a color filter layer, and a black matrix layer. The first electrode layer 308 may include at least one first electrode 308E1, and the first electrode 308E1 of this embodiment may have a similar or same pattern as the first electrode of the first embodiment, and thus may have a plurality of openings OP. The first electrode 308E1 may overlap the second electrode layer 312 in a plan view direction TD, and the light state and the dark state of the liquid crystal panel 304 may be adjusted by a voltage difference between the first electrode 308E1 and the second electrode layer 312. Since the first electrode 308E1 has an opening OP, when the display device 31 performs fingerprint recognition, the portion of the liquid crystal panel 304 corresponding to the first electrode 308E1 may be dark, and the portion corresponding to the opening OP may be bright, so that the detection light (Eg, light L2) can be collimated. In this embodiment, the liquid crystal panel 304 may further include an upper polarizer 330U and a lower polarizer 330L, which are adhered to the upper surface of the second substrate 126 and the lower surface of the first substrate 118 through the adhesive layers AL1 and AL2, respectively. In addition, the liquid crystal panel 304 can be adhered to the light emitting surface 340S of the liquid crystal display panel 340 through the adhesive layer AL3. In some embodiments, the first electrode 308E1 may be distributed throughout the display area, so that the first electrode 308E1 may form a touch element for detecting a finger position, but is not limited thereto. In some embodiments, the first electrode layer 308 may optionally further include a plurality of third electrodes (not shown), and the first electrode 308E1 and the third electrode may form a touch element for detecting a finger position. In some embodiments, the display device 31 may further include a touch panel disposed on the liquid crystal panel 304.

The liquid crystal display panel 340 of this embodiment may be any type of liquid crystal display panel. The edge electric field switching type is taken as an example in the following, but it is not limited thereto. The difference between the liquid crystal display panel 340 in this embodiment and the liquid crystal panel 104 shown in FIG. 3 is that the liquid crystal display panel 340 does not include a first electrode layer, and therefore does not have a touch sensing function and a fingerprint recognition function. For example, the liquid crystal display panel 340 may include a third substrate 342, a fourth substrate 344, another liquid crystal layer 346, a thin film transistor layer 348, a third electrode layer 350, an insulating layer 352, a fourth electrode layer 354, and a color filter. The light layer 122 and the black matrix layer 124. The third substrate 342, the fourth substrate 344, the other liquid crystal layer 346, the thin film transistor layer 348, the third electrode layer 350, the insulating layer 352, the fourth electrode layer 354, the color filter layer 122, and the black matrix in this embodiment. The layer 124 may be similar to or the same as the first substrate, the second substrate, the liquid crystal layer, the thin film transistor layer, the third electrode layer, the insulating layer, the second electrode layer, the color filter layer, and the black matrix layer of the first embodiment. , So I wo n’t go into details here. Although not shown in FIG. 9, the liquid crystal display panel 340 may further include a lower polarizer disposed between the third substrate 342 and the light source 102. The liquid crystal display panel 340 of this embodiment can share the lower polarizer 330L with the liquid crystal panel 304 without the need to additionally provide another upper polarizer, but it is not limited thereto.

In addition, in this embodiment, each of the openings OP of the first electrode 308E1 may correspond to one of the first color filter 122a, the second color filter 122b, or the third color filter 122c in the plan direction TD, respectively. For example, each of the openings OP may expose a corresponding second color filter 122b in the top view TD, so that the light L2 emitted from the liquid crystal display panel 340 may pass through the portion of the liquid crystal panel 304 corresponding to the opening OP as detection light. . The light sensor 306 in this embodiment may be disposed in the liquid crystal display panel 340, for example, in the opening 124a of the black matrix layer 124 corresponding to the opening OP of the first electrode 308E1, but is not limited thereto. In some embodiments, the light sensor 306 may also be disposed in the thin film transistor layer 348 corresponding to the opening OP of the first electrode 308E. In some embodiments, the light sensor 306 may also be disposed in the liquid crystal panel 304.

Please refer to FIG. 10, which is a schematic cross-sectional view of a display device according to a modified embodiment of the third embodiment of the present invention. As shown in FIG. 10, the display device 32 provided in this embodiment is different from the display device 31 shown in FIG. 9 in that the display device 32 uses a self-luminous display panel 356 instead of a liquid crystal display panel and a backlight module. Specifically, the light source 102 includes a self-luminous display panel 356, such as an organic light-emitting diode display panel, disposed below the liquid crystal panel 304, that is, the liquid crystal panel 304 is disposed between the self-luminous display panel 356 and the cover plate 134. In this embodiment, the self-luminous display panel 356 may include a plurality of first light-emitting elements 358a, a plurality of second light-emitting elements 358b, and a plurality of third light-emitting elements 358c. The first light-emitting element 358a, the second light-emitting element 358b, and the third light-emitting element 358c can respectively generate different colors of light to mix white light. For example, the first light-emitting element 358a can generate blue light and the second light-emitting element 358b can generate The green light and the third light emitting element 358c may generate red light, but it is not limited thereto. The first light emitting element 358a, the second light emitting element 358b, and the third light emitting element 358c may include an organic light emitting diode or an inorganic light emitting diode. In this embodiment, each of the openings OP of the first electrode 308E1 corresponds to or overlaps one of the first light-emitting element 358a, the second light-emitting element 358b, or the third light-emitting element 358c in the plan direction TD, for example, it may correspond or overlap One of the second light emitting elements 358b for generating green light.

In addition, the self-luminous display panel 356 may include a plurality of thin-film transistor TFTs, which are electrically connected to the first light-emitting element 358a, the second light-emitting element 358b, and the third light-emitting element 358c, respectively, and the light sensor 306 may be disposed on the self-light-emitting element. Display panel 356. The light sensor 306 and the light emitting element may be formed on the same third substrate 342. For the sake of clarity, the thin-film transistor TFT, light-emitting element, and light sensor 306 in FIG. 10 are represented by a single square, and the thin-film transistor layer is omitted, but this creation is not limited to this. The thin-film transistor, light-emitting element, and light The sensors can also be formed in the same thin-film transistor layer. In some embodiments, the light sensor 306 may also be disposed on the lower surface of the third substrate 342. In addition, the self-luminous display panel 356 may further include a packaging cover 360 covering the thin film transistor TFT, the light sensor 306 and the light emitting element. In some embodiments, the package cover 360 may be replaced by a package layer.

Please refer to FIG. 11, which is a schematic cross-sectional view of a display device according to a fourth embodiment of the present invention. As shown in FIG. 11, the difference between the display device 4 provided in this embodiment and the third embodiment is that the liquid crystal panel 404 can be disposed between the liquid crystal display panel 440 and the light source 402. Since the liquid crystal panel 404 in this embodiment can be the same as the liquid crystal panel 304 in the third embodiment, it will not be repeated here. In this embodiment, the liquid crystal display panel 440 may have a display area DR, and the light sensor 406 may be disposed in the display area DR of the liquid crystal display panel 440, and is disposed corresponding to the opening OP of the first electrode 308E1, for example, in a top view TD In the above, each light sensor 406 may be adjacent to the corresponding opening OP, so that each light sensor 406 only detects the detection light passing through the corresponding opening OP, but is not limited thereto. For clear illustration, the liquid crystal display panel 440 in FIG. 11 only illustrates the third substrate 342, the fourth substrate 344, the liquid crystal layer 346, and the light sensor 406, and omits other elements or film layers, but the creation is not limited thereto. In some embodiments, each opening OP of the first electrode 308E1 may still correspond to one of the first color filter, the second color filter, or the third color filter in the top view direction TD, respectively. In some embodiments, the display device 4 may further include a touch panel disposed on the liquid crystal display panel 440.

In this embodiment, the light source 402 may be, for example, an edge-type backlight module, which may include a light emitting element 462, a light guide plate 464, a reflection sheet 466, a brightness enhancement film 468, 470, and a diffusion sheet 472. The light emitting element 462 may be disposed on the side of the light guide plate 464, the reflection sheet 466 is disposed below the light guide plate 464, the brightness enhancement films 468, 470 are sequentially stacked on the light exit surface 464S of the light guide plate 464, and the diffusion sheet 472 is disposed on the Bright film 470. The brightness enhancement films 468 and 470 of this embodiment may have a plurality of ridges extending along different directions, for example, but it is not limited thereto. In some embodiments, the light source 402 may also be a direct type backlight module. In some embodiments, the light source 402 may include a plurality of light emitting diodes, and the light sources 402 are dispersedly disposed directly below the liquid crystal display panel 440.

Please refer to FIG. 12 and FIG. 13. FIG. 12 is a schematic plan view of a display device according to a fifth embodiment of the present invention. FIG. 13 is a schematic cross-sectional view of FIG. 12 along a section line B-B '. As shown in FIG. 12 and FIG. 13, the display device 51 provided in this embodiment is different from the fourth embodiment described above in that the light source 502 can omit the diffusion sheet, and the liquid crystal panel can be replaced by a partial adjustment structure 574. Specifically, since the light source 502 omits a diffusion sheet, when the display device 51 displays an image, the local adjustment structure 574 provided between the light source 502 and the liquid crystal display panel 440 needs to have a certain haze in order to remove the light source 502 from The generated light L1 is evenly diffused, so that the local adjustment structure 574 needs to have a function of diffusing light when displaying an image. In addition, when the display device 51 performs fingerprint recognition, the haze of the portion P1 of the local adjustment structure 574 located in the fingerprint recognition area FR may be smaller than the haze of the portion P2 of the local adjustment structure 574 outside the fingerprint recognition area FR, that is, local The penetration rate of the portion P1 of the adjustment structure 574 located in the fingerprint recognition area FR is greater than the penetration rate of the portion P2 of the local adjustment structure 574 located outside the fingerprint recognition area FR. For example, a portion P1 of the local adjustment structure 574 located in the fingerprint recognition area FR may be transparent. Therefore, the light L1 generated by the light source 502 can penetrate the transparent portion P1 of the local adjustment structure 574 without being diffused by the diffusion sheet, so that the detection light emitted from the fingerprint recognition area FR of the liquid crystal display panel 440 can be nearly collimated. Therefore, the fingerprint image detected by the light sensor 406 can be improved.

In this embodiment, the partial adjustment structure 574 may include a first substrate 518, a second substrate 526, a first electrode layer 576, a liquid crystal layer 578, and a second electrode layer 580. The first substrate 518 is disposed on Between the second substrate 526 and the light source 502, a liquid crystal layer 578 is disposed between the first substrate 518 and the second substrate 526, a first electrode layer 576 is disposed between the liquid crystal layer 578 and the first substrate 518, and a second electrode layer 580 is disposed between the liquid crystal layer 578 and the second substrate 526. The first electrode layer 576 may include a plurality of adjustment electrodes 576E, which are insulated from each other and disposed in the display region DR. For example, the adjustment electrodes 576E are arranged in an array, and the second electrode layer 580 can cover the entire display area DR, but it is not limited thereto. At least one of the adjustment electrodes 576E may be disposed in the fingerprint recognition area FR. For example, one of the adjustment electrodes 576E may cover the fingerprint recognition area FR, but is not limited thereto. The liquid crystal molecules of the liquid crystal layer 578 in this embodiment may include polymer disperse liquid crystal (PDLC), polymer network liquid crystal (PNLC), cholesterol liquid crystal (cholesteric liquid crystal), or other suitable liquid crystal. In addition, the partial adjustment structure 574 may further include a plurality of wires 582 to electrically connect the adjustment electrodes 576E to the control element 584 separately. In some embodiments, the positions of the first electrode layer 576 and the second electrode layer 580 are interchangeable.

The driving method when the display device 51 of this embodiment performs fingerprint recognition will be further described below, and the liquid crystal layer 578 uses polymer dispersed liquid crystal as an example, but is not limited thereto. Please refer to FIG. 14 and refer to FIG. 12 and FIG. 13 together. FIG. 14 shows a timing chart of driving signals provided to the adjustment electrodes located in and outside the fingerprint recognition area. As shown in FIGS. 12 to 14, when the display device 51 performs fingerprint recognition, the display device 51 provides a driving signal S4 to the adjustment electrode 576E located in the fingerprint recognition area FR, and a driving signal S5 to the fingerprint recognition area. Adjustment electrode 576E outside FR. Since the driving signal provided by the display device 51 to the second electrode layer 580 during fingerprint recognition is the same as or has a close voltage value to the driving signal S5 provided to the adjustment electrode 576E located outside the fingerprint recognition area FR, it is not illustrated in the 14th In the figure. In this embodiment, the driving signal S5 may be a DC signal, and for a certain voltage V1, the driving signal S4 may be provided by an alternating current. The driving signal S4 may be, for example, a square wave signal, that is, the peak V2 of the driving signal S4 may be greater than the driving signal. The voltage V1 of the signal S5, and the bottom value V3 may be smaller than the voltage V1 of the driving signal S5. For example, the voltage V1 may be an average value of the peak V2 and the valley value V3, so that the difference between the voltage V1 and the peak value V2 may be the same as the difference between the voltage V1 and the valley value V3, so that the liquid crystal layer 578 in the fingerprint recognition area FR Transparency continues to be consistent.

Please refer to FIGS. 13 and 14 at the same time. When the display device 51 performs fingerprint recognition, a voltage difference is provided between the adjustment electrode 576E and the second electrode layer 580 in the fingerprint recognition area FR, so that it is located in the fingerprint recognition area FR The liquid crystal layer 578 is transparent, so that the light L1 generated by the light source 502 can penetrate the transparent portion P1 of the local adjustment structure 574 and the liquid crystal display panel 440 without being scattered, thereby collimating the emitted detection light; There is no voltage difference between the adjustment electrode 576E located outside the fingerprint recognition area FR and the second electrode layer 580, so that the liquid crystal layer 578 located outside the fingerprint recognition area FR appears opaque or translucent fog, so the light source 502 generates The light can be scattered by the liquid crystal layer 578, and the light emitting surface 574S of the local adjustment structure 574 outside the fingerprint recognition area FR emits uniform light for displaying images.

Please refer to FIG. 15, which illustrates a schematic top view of a display device according to a modified embodiment of the fifth embodiment of the present invention. The difference between the display device 52 of this modified embodiment and the display device 51 of FIG. 12 is that the first electrode layer 576 of this modified embodiment may include a plurality of first electrode strips 576SE, and the second electrode layer 580 includes a plurality of first electrode strips 576SE. The two electrode bars 580SE, and the first electrode bar 576SE and the second electrode bar 580SE are staggered in the plan direction TD. In this modified embodiment, the first electrode strip 576SE may form a plurality of overlapping regions OR with the second electrode strip 580SE in a plan view TD, and at least one overlapping region OR may be located in the fingerprint recognition region FR to pass through the first electrode. The voltage difference between the strip 576SE and the second electrode strip 580SE to control the overlapping area OR located in the fingerprint recognition area FR is transparent, and the overlapping area OR outside the fingerprint recognition area FR is foggy.

Please refer to FIG. 16, which is a schematic cross-sectional view of a display device according to another variation of the fifth embodiment of the present invention. The difference between the display device 53 of this modified embodiment and the display device 51 shown in FIG. 12 is that the display device 53 of this modified embodiment may include an image sensor 592 disposed under the backlight module 594, and the image sense The detector 592 can replace the light sensor 406 in the display device 51 to detect a fingerprint image of a finger. In this modified embodiment, the display device 53 may further include another light source 596 for generating light for detecting a fingerprint image, but is not limited thereto. In other embodiments, the display device 53 may not include the light source 596. The light source 596 may be disposed under the backlight module 594, for example. In this modified embodiment, the design of the backlight module 594 allows the light from the light source 596 to pass through, and allows the image sensor 592 to detect the reflected light reflected from the finger. For example, the image sensor 592 may include a complementary metal-oxide-semiconductor (CMOS) image-sensing chip, but is not limited thereto. The light source 596 may include, for example, a visible light-emitting diode or an invisible light-emitting diode. The visible light emitting diode may be, for example, an infrared light emitting diode, but is not limited thereto. In some embodiments, the image sensor 592 may also be disposed in the backlight module 594, for example, disposed between the light guide plate and the reflective sheet, but is not limited thereto. The local adjustment structure 574, the liquid crystal display panel 440, and the cover plate 134 of this modified embodiment can be applied to the local adjustment structure, the liquid crystal display panel, and the cover plate of the above embodiment, and therefore are not described in detail here.

Please refer to FIG. 17, which illustrates a block diagram of a control element of a display device according to a sixth embodiment of the present invention. In this embodiment, the display device 61 can be applied to the display device of any of the above-mentioned embodiments. The display device 61 is the display device 51 of FIG. 13 as an example for further details. As shown in FIGS. 13 and 17, the display device 61 may include a backlight control element 686, an integrated control element 688, and a main element 690, which are electrically connected to each other. The integrated control element 688 may include a touch display control element 688T and a fingerprint. Identification control element 688F. The backlight control element 686 can be used to control the brightness of the light source 502 and the local adjustment structure 574, so that the local adjustment structure 574 is partially transparent or fogged over the entire surface. The integrated control element 688 can be used to control the light source 502, the local adjustment structure 574, and the light sensor 406. The touch display control element 688T can be used to control the touch element to detect the position of the finger close or touch, and in the fingerprint recognition mode, when the finger is close to or touches the display area DR, the finger is close to or touches the display area DR. The area is determined as the fingerprint recognition area FR. The fingerprint recognition control element 688F can be used to control the light source 502, the partial adjustment structure 574, and the light sensor 406. In the fingerprint recognition mode, a fingerprint recognition step is performed to obtain a fingerprint image of a finger. Therefore, when the touch display control element 688T in the integrated control element 688 detects the proximity of the finger or touches the display device 61, it can directly transmit this information to the fingerprint identification control element 688F and directly to the backlight control element 686, or It is transmitted to the backlight control element 686 through the main element 690 for fingerprint identification. When the fingerprint recognition control element 688F detects a fingerprint image, it may notify the backlight control element 686 to stop fingerprint recognition directly or through the main element 690. In this embodiment, the integrated control element 688 may be a single chip with a micro processor (MCU). In some embodiments, when the display device 61 is applicable to the display devices of the first to fourth embodiments, the integrated control element 688 can be used to control the light source, the liquid crystal panel, and the light sensor.

Please refer to FIG. 18, which illustrates a block diagram of a control element of a display device according to a modified embodiment of the sixth embodiment of the present invention. As shown in FIG. 18, the difference between the display device 62 of the present embodiment and the display device 61 of the above-mentioned embodiment is that the touch display control element 688T and the fingerprint recognition control element 688F of the display device 62 of the present modified embodiment are separated from each other. Therefore, the touch display control element 688T and the fingerprint identification control element 688F can be electrically connected to the main element 690 respectively. In this modified embodiment, the touch display control element 688T can be electrically connected to the fingerprint identification control element 688F. Therefore, the touch display control element 688T can directly or through the main element 690 send a message to the fingerprint recognition control element 688F to further directly notify or via the main element 690 to notify the backlight control element 686 to adjust the local adjustment structure 574 to present a partial transparency or the entire surface. Misty. Similarly, in this modified embodiment, the touch display control element 688T and the fingerprint recognition control element 688F may be single chips with a micro processor (MCU).

The operation method of the above display device will be further described below. Please refer to FIG. 19, which is a schematic flowchart of an operation method of a display device according to a seventh embodiment of the present invention. The display device of this embodiment can also be applied to the display device of any of the above embodiments. As shown in FIG. 19, the method for operating the display device provided in this embodiment includes steps S12 to S30. For the convenience of description, the display device 11 in FIG. 3 as an example and the flow in FIG. 19 are further described in detail below, but are not limited thereto. First, step S12 is performed to put the display device 11 into a fingerprint recognition mode. For example, the user may perform step S12 by pressing a function key of the display device 11 or detecting whether a finger touches the display device 11 through the display device 11, but is not limited thereto. Then, step S16 is performed, that is, a touch detection step is performed to detect whether a finger is close to or touches the display device 11. When a finger approaches or touches the display area DR of the display device 11, the area of the display area DR that the finger approaches or touches is determined as the fingerprint recognition area FR. When the display device 11 determines that there is no finger proximity or touch, step S16 is performed again until a finger proximity or touch is detected. In some embodiments, the operation method may further include performing step S14 between step S12 and step S16, so as to use the display device 11 to display the position that can be used as the fingerprint recognition area FR, so that the user can know that the fingerprint recognition is available. position.

When the display device 11 determines that a finger is near or touched, a fingerprint recognition step is performed. The fingerprint identification step may include steps S18 and S20. In step S18, the alignment direction of the liquid crystal molecules 110L of the liquid crystal panel 104 located in the fingerprint recognition area FR is adjusted, so that at least a part of the liquid crystal panel 104 located in the fingerprint recognition area FR is in a transparent state, and the light L1 generated by the light source 102 is allowed. The finger F is radiated through at least a part L2 of the liquid crystal panel 104, and the finger F reflects the light L2 as a reflected light L3. For example, in step S18, a voltage difference may be provided between the first electrode 108E1 and the second electrode 112E and / or the first electrode 108E1 and the third electrode layer 114, so that the voltage difference between the first electrode 108E1 and the third electrode layer 114 and the first electrode 108E1 in the plan view TD is provided. The overlapping liquid crystal molecules 110l may be vertically aligned, so the portion of the liquid crystal panel 104 corresponding to the first electrode 108E1 may be opaque, and the liquid crystal molecules 110L that do not overlap the first electrode 108E1 in the top view TD may be horizontally aligned. Therefore, a portion of the liquid crystal panel 104 corresponding to the opening OP of the first electrode 108E1 may be in a light transmitting state. This can help collimate the light L2 emitted from the light emitting surface 104S of the liquid crystal panel 104. In some embodiments, the display device 11 may not perform step S16, and directly perform step S18 after step S12 or step S14.

In this embodiment, step S18 may optionally further include increasing the brightness of light corresponding to a portion of the liquid crystal panel 104. Specifically, in order to increase the brightness of the reflected light L3 detected by the light sensor 106, the brightness of the light L2 emitted from the part of the liquid crystal panel 104 located in the fingerprint recognition area FR may be further increased in step S18. . For example, without affecting the image displayed by the display device 11 in the display area outside the fingerprint recognition area FR, local dimming technology can be used to increase the light generated by the light source 102 located in the fingerprint recognition area. The brightness of the light L1 is not limited thereto.

Then, step S20 is performed, and the light sensor 106 is used to detect the reflected light L3 reflected from the finger F to obtain a fingerprint image of the finger F. Then, step S22 is performed to compare the detected fingerprint image with a fingerprint information to determine whether the fingerprint image matches the fingerprint information. In this embodiment, the fingerprint information may be stored in the display device 11 in advance, but it is not limited thereto. In some embodiments, the fingerprint information may include at least one fingerprint image.

When the fingerprint image matches the fingerprint information, step S24 is performed to perform a specific function. For example, certain functions may be, but are not limited to, allowing users to use mobile phones, allowing financial transactions, or allowing access to private data. When the fingerprint image does not match the fingerprint information, step S26 may be optionally performed to calculate the number of times of non-compliance.

Next, step S28 is performed to determine whether the number of non-conformities is greater than N, where N may be a positive integer, for example, may be 3 or 5. When the number of non-compliances is greater than N, step S30 may be selectively performed to enter another verification mode, so that the user can still perform a specific function. For example, another authentication mode may be an input password mode, a graphic unlock mode, or other suitable authentication modes. When the number of non-conformities is less than or equal to N, step S16 may be performed again.

In summary, the display device provided by this creation can not only use a liquid crystal display panel as a device for displaying an image, but also can collimate the detection light penetrating through the liquid crystal display panel through the opening of the first electrode or the partial adjustment structure to make the display The light sensor of the device can detect a clear fingerprint image, so the display device can have a fingerprint recognition function in the display area. This can effectively reduce the overall cost of the display device.

The above description is only a preferred embodiment of this creation. Any equal changes and modifications made in accordance with the scope of the patent application for this creation shall fall within the scope of this creation.

11, 12, 2, 31, 32, 4, 51, 52, 53, 61, 62‧‧‧ display devices
1a‧‧‧display surface
102, 402, 502, 596‧‧‧‧
104, 304, 404‧‧‧ LCD panel
104S, 204S1, 340S, 574S
106, 306, 406‧‧‧ light sensors
108, 308, 576‧‧‧ first electrode layer
108E1, 308E1‧‧‧First electrode
108E2‧‧‧Third electrode
110, 346, 578‧‧‧ liquid crystal layer
110L‧‧‧LCD molecules
110G‧‧‧Grating
112, 312, 580‧‧‧Second electrode layer
112E‧‧‧Second electrode
114, 350‧‧‧ Third electrode layer
116, 352‧‧‧ Insulation
118, 518‧‧‧ first substrate
120, 348‧‧‧ thin film transistor layer
122‧‧‧Color Filter
122a‧‧‧The first color filter
122b‧‧‧Second color filter
122c‧‧‧Third color filter
124‧‧‧ Black Matrix Layer
126, 526‧‧‧Second substrate
128, 132, AL1, AL2, AL3‧‧‧adhesive layer
130, 230, 330U‧‧‧ upper polarizer
134‧‧‧ Cover
204, 340, 440‧‧‧ LCD display panel
204S2‧‧‧ incident surface
2041‧‧‧Color filter substrate
2042‧‧‧Thin film transistor substrate
216, 330L‧‧‧Polarizer
342‧‧‧Third substrate
344‧‧‧Fourth substrate
354‧‧‧Fourth electrode layer
356‧‧‧ self-luminous display panel
358a‧‧‧First light emitting element
358b‧‧‧Second light emitting element
358c‧‧‧third light emitting element
360‧‧‧Packing cover
462‧‧‧Light-emitting element
464‧‧‧light guide
466‧‧‧Reflector
468, 470‧‧‧brightening film
472‧‧‧ diffuser
574‧‧‧Local adjustment structure
576E‧‧‧adjust electrode
576SE‧‧‧First electrode strip
580SE‧‧‧Second electrode strip
582‧‧‧wire
584‧‧‧Control element
592‧‧‧Image sensor
594‧‧‧ backlight module
686‧‧‧ backlight control element
688‧‧‧Integrated control element
688T‧‧‧Touch display control element
688F‧‧‧Fingerprint identification control element
690‧‧‧Main components
A-A ', B-B'‧‧‧ hatching
DR‧‧‧Display Area
FR‧‧‧Fingerprint recognition area
F‧‧‧finger
NDR‧‧‧ Non-display area
OR‧‧‧ overlapping area
P1, P2‧‧‧‧parts
SPX1, SPX2, SPX3 ‧‧‧ sub pixels
PX1, PX2‧‧‧pixel θ‧‧‧ divergence angle
W‧‧‧Width
L1, L2‧‧‧‧light
L3‧‧‧Reflected light
OP, 110a, 124a‧‧‧ opening
SL‧‧‧Slit
TFT‧‧‧ thin film transistor
SP‧‧‧ Spacer
S1‧‧‧Sync signal
S2, S3, S4, S5‧‧‧ drive signals
Sx‧‧‧ display signal
T1, T2‧‧‧‧frame
DT1, DT2, DT3 ‧‧‧ Display drive period
BT1, BT2 ‧‧‧ Interval
TD‧‧‧view direction
V1‧‧‧Voltage
V2‧‧‧peak
V3‧‧‧ Valley
S12, S14, S16, S18, S20, S22, S24, S26, S28, S30 ‧‧‧ steps

FIG. 1 is a schematic top view of a display device according to a first embodiment of the present invention.
FIG. 2 is a schematic top view of a display device corresponding to a single first electrode located in a fingerprint recognition area and a third electrode outside the fingerprint recognition area according to the first embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view taken along a section line AA ′ in FIG. 2.
FIG. 4 is a timing chart of the synchronization signal, the driving signal of the third electrode, and the driving signal of the first electrode of the liquid crystal panel according to the first embodiment of the present invention.
FIG. 5 is a schematic diagram of displaying images by the display device according to the first embodiment of the present invention.
FIG. 6 is a schematic top view of a display device according to a modified embodiment of the first embodiment of the present invention.
FIG. 7 is a schematic diagram of a fingerprint identification method of a display device according to a second embodiment of the present invention.
FIG. 8 is a schematic diagram of a fingerprint identification method of a display device according to a modified embodiment of the 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 modified embodiment of the third embodiment of the present invention.
FIG. 11 is a schematic cross-sectional view of a display device according to a fourth embodiment of the present invention.
FIG. 12 is a schematic top view of a display device according to a fifth embodiment of the present invention.
FIG. 13 is a schematic sectional view of FIG. 12 along the section line BB ′.
FIG. 14 is a timing diagram of driving signals provided to the adjustment electrodes located in and outside the fingerprint recognition area.
FIG. 15 is a schematic top view of a display device according to a modified embodiment of the fifth embodiment of the present invention.
FIG. 16 is a schematic cross-sectional view of a display device according to another variation of the fifth embodiment of the present invention. FIG. 17 is a block diagram of a control element of the display device of the sixth embodiment of the present invention.
FIG. 18 is a block diagram of a control element of a display device according to a modified embodiment of the sixth embodiment of the present invention.
FIG. 19 is a schematic flowchart of an operation method of a display device according to a seventh embodiment of the present invention.

Claims (17)

A display device is used to detect the fingerprint of a finger. The display device has a display area. The display device includes:
A light source
A liquid crystal panel is disposed on the light source. The liquid crystal panel includes a first electrode layer, a liquid crystal layer, and a second electrode layer. The liquid crystal layer is disposed between the first electrode layer and the second electrode layer. The first electrode layer includes at least one first electrode disposed in the display area, the at least one first electrode has a plurality of openings, and a plurality of light sensors corresponding to one of the plurality of openings, respectively. The display device according to claim 1, wherein the plurality of light sensors are disposed in the liquid crystal panel, the second electrode layer is disposed between the light source and the liquid crystal layer, and the liquid crystal panel further includes a third electrode Layer, and the second electrode layer is disposed between the liquid crystal layer and the third electrode layer, wherein the second electrode layer includes a plurality of second electrodes, and each of the second electrodes has at least one slit. The third electrode layer is exposed in a plan view of the device. The display device according to claim 2, wherein the at least one first electrode overlaps a plurality of the plurality of second electrodes in the plan view direction of the display device. The display device according to claim 2, wherein the liquid crystal panel further includes a plurality of first color filters, a plurality of second color filters, and a plurality of third color filters, which are disposed on the first electrode layer. And each of the openings corresponds to one of the plurality of first color filters, the plurality of second color filters, or the plurality of third color filters in the plan view direction of the display device. The display device according to claim 4, wherein the plurality of light sensors are disposed between the plurality of second color filters and the at least one first electrode. The display device according to claim 1, wherein the first electrode layer further includes a plurality of third electrodes disposed in the display area, and each of the third electrodes does not have an opening, and the third electrode corresponds to the third electrode. The display area does not have a fingerprint recognition function. The display device according to claim 1, wherein the liquid crystal panel further includes a thin film transistor layer, and the plurality of light sensors are disposed between a black matrix layer and a second substrate, or the thin film transistor layer in. The display device according to claim 1, further comprising a liquid crystal display panel disposed between the light source and the liquid crystal panel, and the plurality of light sensors are disposed in the liquid crystal display panel. The display device according to claim 8, wherein the liquid crystal display panel includes a plurality of first color filters, a plurality of second color filters, and a plurality of third color filters, and each of the openings is on the display. The top view of the device corresponds to one of the plurality of first color filters, the plurality of second color filters, or the plurality of third color filters, respectively. The display device according to claim 1, wherein the light source includes a self-luminous display panel, and the plurality of light sensors are disposed in the self-luminous display panel. The display device according to claim 10, wherein the self-luminous display panel includes a plurality of first light-emitting elements, a plurality of second light-emitting elements, and a plurality of third light-emitting elements, and each of the openings is in the plan view direction of the display device. Each of the plurality of first light-emitting elements, the plurality of second light-emitting elements, or the plurality of third light-emitting elements is corresponding to one of them. The display device according to claim 1, further comprising a liquid crystal display panel, the liquid crystal panel is disposed between the light source and the liquid crystal display panel, and the plurality of light sensors are disposed in the liquid crystal display panel. A display device is used to detect the fingerprint of a finger. The display device has a display area. The display device includes:
A liquid crystal display panel;
A light source disposed under the liquid crystal display panel;
A local adjustment structure is disposed between the light source and the liquid crystal display panel. The local adjustment structure includes a first electrode layer, a liquid crystal layer, and a second electrode layer. When the display device performs fingerprint recognition, the finger The display area that is near or touched is a fingerprint recognition area, and the haze of a part of the local adjustment structure located in the fingerprint recognition area is smaller than the haze of another part of the local adjustment structure located outside the fingerprint recognition area; And a plurality of light sensors are disposed in the display area of the liquid crystal display panel. The display device according to claim 13, wherein the first electrode layer includes a plurality of adjustment electrodes, and at least one of the plurality of adjustment electrodes is disposed in the display area. The display device according to claim 13, wherein the first electrode layer includes a plurality of first electrode strips, the second electrode layer includes a plurality of second electrode strips, and the plurality of first electrode strips and the plurality of first electrode strips The two electrode strips are staggered in a plan view direction of the display device. The display device according to claim 13, wherein the liquid crystal layer includes a polymer dispersed liquid crystal, a polymer network liquid crystal, or a cholesterol-type liquid crystal. An integrated control chip is integrated in a display device. The display device includes a light source, a liquid crystal panel disposed on the light source, and a plurality of light sensors. The integrated control chip is used to control the light source, the liquid crystal panel, and the light source. A plurality of light sensors, the liquid crystal panel has a display area, and the plurality of light sensors are disposed in the display area, the integrated control chip includes:
A touch display control element for determining, when a finger approaches or touches the display area in a fingerprint recognition mode, the display area approached or touched by the finger as a fingerprint recognition area; and a fingerprint recognition control element For performing a fingerprint identification step in the fingerprint identification mode, wherein the fingerprint identification step includes:
The liquid crystal molecules of the liquid crystal panel located in the fingerprint recognition area are adjusted so that at least a part of the liquid crystal panel located in the fingerprint recognition area is in a light-transmitting state, and the light generated by the light source is allowed to pass through the at least part of the liquid crystal panel and radiate. To the finger, wherein the finger reflects the light into a reflected light; and using the plurality of light sensors to detect the reflected light reflected from the finger to obtain a fingerprint image of the finger.