CN213424993U

CN213424993U - Dual-mode display device with light sensing function

Info

Publication number: CN213424993U
Application number: CN202023071478.3U
Authority: CN
Inventors: 周正三; 范成至
Original assignee: Egis Technology Inc
Current assignee: Egis Technology Inc
Priority date: 2020-08-03
Filing date: 2020-12-18
Publication date: 2021-06-11
Anticipated expiration: 2030-12-18
Also published as: TW202207015A; WO2022027901A1; TWM610904U; CN112510075A

Abstract

The application provides a dual-mode display device with a light sensing function, which at least comprises: a substrate; a control unit; and a plurality of photoelectric conversion units disposed on the substrate and electrically coupled to the control unit. In a display mode, the control unit controls the plurality of photoelectric conversion units to enter a light emitting mode; and under a sensing mode, the control unit controls at least one of the plurality of photoelectric conversion units to enter a light sensing mode. The photoelectric conversion unit in the light-emitting mode can provide light for display and light for sensing. Because the display does not need to be redesigned and manufactured, and only the circuit driving mode needs to be changed, a large amount of cost is not needed to be consumed, and the due functions of the optical sensor in the screen can be achieved.

Description

Dual-mode display device with light sensing function

Technical Field

The present application provides a dual-mode display device with light sensing function, and more particularly, to a dual-mode display device with both display and light sensing functions by using dual-mode photoelectric conversion units.

Background

The most important information and man-machine interface of present mobile electronic devices (such as mobile phones, tablet computers, notebook computers, etc.) is the display device, so the development of many sensors must meet the development of the display device to develop new technologies, for example, the development of the full screen of the mobile phone limits or changes the space of many sensors, including under-screen fingerprints or under-screen cameras, etc., the miniaturized optical imaging device is disposed under the screen (which may be called under-screen), and the image of the object above the screen, such as a fingerprint image or a photo, can be captured through the partial Light transmission of the screen (especially the Organic Light Emitting Diode (OLED) screen).

However, the off-screen image sensing technology has a certain difficulty, because the light representing the image needs to penetrate the display panel, causing difficulty in signal processing (because the image signal is combined with the panel light-transmitting pattern), and needs to be solved by a complicated image processing method, and meanwhile, different display panel light-transmitting ratios and light-transmitting patterns are different, and solutions for the above are often required. Therefore, in order to solve the above problems, the present disclosure provides a design of an on-screen optical sensing device, which is the problem to be solved by the present disclosure.

SUMMERY OF THE UTILITY MODEL

Therefore, an object of the present application is to provide a dual-mode display device using a dual-mode photoelectric conversion unit to achieve display, photo sensing and anti-counterfeiting functions, which can be applied to OLED displays, micro-led displays, inorganic led displays or other displays having independent light emitting units.

To achieve the above object, the present application provides a dual mode display device, comprising at least: a substrate; a control unit; and a plurality of photoelectric conversion units; the plurality of photoelectric conversion units are disposed on the substrate and electrically coupled to the control unit. In a display mode, the control unit controls the plurality of photoelectric conversion units to enter a light emitting mode; and under a sensing mode, the control unit controls at least one of the plurality of photoelectric conversion units to enter a light sensing mode.

The present application also provides a dual mode display device, at least comprising: a substrate; a control unit; and a plurality of photoelectric conversion units; the plurality of photoelectric conversion units are arranged on the substrate and electrically coupled to the control unit; wherein the control unit controls and adjusts the light emission ratios of the three primary colors of the three primary color photodiodes of the photoelectric conversion units, and further controls the three primary color photodiodes having different three primary color energy levels to receive light of different spectra at the time of sensing to perform the function of spectral separation.

The present application also provides a dual mode display device, at least comprising: a substrate; a control unit; and a plurality of photoelectric conversion units; the plurality of photoelectric conversion units are arranged on the substrate and electrically coupled to the control unit; the control unit controls the photoelectric conversion units with the first energy level to receive the corresponding first spectrum and generate a first electric signal, and controls the photoelectric conversion units with the second energy level to receive the corresponding second spectrum and generate a second electric signal, so that the operation of the first electric signal and the second electric signal is executed to achieve the function of spectrum separation.

Through the above embodiments, the display and the light sensing can be performed by using the photoelectric conversion units in the light emitting mode and the light sensing mode, wherein the photoelectric conversion units in the light emitting mode can provide light for display and light for sensing. Because the display does not need to be redesigned and manufactured, and only the circuit driving mode needs to be changed, a large amount of cost is not needed to be consumed, and the due functions of the optical sensor in the screen can be achieved. Moreover, by utilizing the characteristics of the RGB diodes, the spectrum separation can be executed, the sensing data for anti-counterfeiting can be provided, and a color filter element is not required to be additionally arranged, so that the cost can be effectively saved.

In order to make the aforementioned and other objects of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a partial cross-sectional view of a dual-mode display device performing a display function according to a preferred embodiment of the present application.

FIG. 2 is a schematic partial cross-sectional view of a dual-mode display device performing a light sensing function.

FIG. 3 is a functional block diagram of a dual mode display device.

Fig. 4A to 4B show two states of the pixel.

Fig. 5A to 5C are three examples of pixels.

FIG. 6 is a schematic partial cross-sectional view of a dual mode display device performing a spectral splitting function.

Fig. 7A to 7B are schematic partial cross-sectional views of a variation of the dual mode display device of fig. 1 performing a display function and a light sensing function.

FIG. 8 is a diagram illustrating different sensing regions of an electronic device equipped with a dual-mode display device.

Reference numerals:

b, blue light; EM is a light emitting unit; f, an object; g, green light; l1, display light; l2, light for sensing; l3, light; r is red light; RC is a light receiving unit; s1, sensing the signal; s2, touch signal; SA1, SA2, SA3: sensing region; 10: a substrate; 12: a transistor layer; 20 photoelectric conversion unit; a red photodiode; 22, green photodiode; 23, blue light photodiode; 24: a pixel; 25: a transistor layer; 25A,25B,25C transistors; 30, a control unit; 40, display panel protective layer; 50, touch sensing layer; 100: a dual mode display device; 200, an electronic device.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

For simplicity of the following description, the conventional OLED is mainly used to operate in two modes, when the OLED operates in a forward bias light emitting mode (referred to as a light emitting mode or an electro-optical conversion mode), the OLED may be used as a display, when the OLED operates in a reverse bias light sensing mode (referred to as a light sensing mode, a light receiving mode or an electro-optical conversion mode), part or all of the OLED may be used as a photodiode to serve as a light sensor, which may be designed as a single-point, multi-point, one-dimensional and two-dimensional, two-dimensional (2D) light sensor capable of sensing an object, and since the OLED operates in two modes, it is referred to as a dual-mode display device, although it is an embodiment that a control unit sets a ratio of light emission to sensing in a sensing region according to an application scene (for example, the ratio of light emission to sensing in a dim scene is 5: 3; the ratio of light emission to sensing in an indoor light source scene is 5: 4; or the ratio of light emission to sensing in a solar light source scene is 1: 4; of course, the ratio is not limited), the application scene can be determined by the control unit according to related information obtained by an ambient light sensor. Furthermore, the control unit can be used to control the three primary color photodiodes of the photoelectric conversion units according to the applied scene, so as to adjust the light emitting ratio of the three primary colors (RGB), and in addition, during sensing, the light with different spectrums can be received by means of the difference of the Energy levels (Energy Gap) of the three primary colors, so as to perform the function of spectrum separation, thereby facilitating the processing of spectrum information, such as the determination of a fake finger. It is noted that the term "at least one" as used herein may include one or more, or some or all of the cases.

The embodiments of the present application will be described with reference to fingerprint sensing, but the present application is not limited thereto, and any light sensing function derived by the present application, whether it is a single-point or one-dimensional (1D) or two-dimensional (2D) image, is within the scope of the present application. Fig. 1 and fig. 2 are partial cross-sectional views of a dual-mode display device performing a display function and a light sensing function according to a preferred embodiment of the present application. FIG. 3 is a functional block diagram of a dual mode display device. As shown in fig. 1 to fig. 3, the dual-mode display device 100 at least includes a substrate 10 (e.g., a glass or polymer flexible substrate), a plurality of photoelectric conversion units 20, and a control unit 30. It should be noted that although the dual-mode display device 100 is illustrated by using an OLED display provided with a sensor as an example, the application is not limited thereto. In another example, the dual-mode display device 100 can also be used as a point, line, or plane sensing device for sensing a biological feature such as a blood vessel image or a blood oxygen concentration image of a finger. In another example, the dual-mode display device 100 is a micro-led display with optical sensors or other displays using similar leds as the display light source.

In one example, the substrate 10 may be a dielectric substrate. A transistor layer 25 (the transistor layer 25 is used as a part of the photoelectric conversion unit 20, that is, the photoelectric conversion unit 20 at least includes the transistor layer 25) may be formed on the substrate 10, such as a thin film transistor layer. Transistor layer 25 has at least one or

more transistors

25A,25B, and 25C that function as switches, and of course also includes conductor connection lines (not shown). In one example, a plurality of photoelectric conversion units 20, which may be organic light emitting diodes or micro light emitting diodes, etc., are disposed on the substrate 10 and arranged in a two-dimensional array. The photoelectric conversion unit 20 includes a plurality of pixels 24, each pixel 24 includes at least one photodiode for three primary colors (a red photodiode 21, a green photodiode 22, and a blue photodiode 23) and at least one

transistor

25A,25B, and 25C for controlling the above photodiodes, and the control unit 30 is electrically coupled to the red photodiode 21, the green photodiode 22, and the blue photodiode 23 through the at least one

transistor

25A,25B, and 25C as a switch. It should be noted that a single photodiode may be connected to a single transistor, a single transistor may be connected to a plurality of photodiodes, or a plurality of transistors may be connected to a single photodiode, which is not particularly limited. Therefore, the control unit 30 is electrically coupled to these photoelectric conversion units 20. For example, the control unit 30 outputs control signals to the

transistors

25A,25B and 25C to control the operation of the three primary color photodiodes. The position where the control unit 30 is disposed is not particularly limited. Of course, the arrangement and number of the transistors and the pixels are described herein as a basic operation, and not as a limitation, and those skilled in the art will appreciate that the number of the control transistors of each pixel may be increased by applying various modifications, such as increasing the design of the reverse bias.

In the display mode, the control unit 30 controls the photoelectric conversion units 20 to enter the light emitting mode to perform the conversion from the electrical signal to the optical signal to provide, for example, the display light L1. In this case, a function of display may be provided.

In the sensing mode, the control unit 30 controls at least one (including one or more) of the photoelectric conversion units 20 to enter the light sensing mode, which receives the light L3 from an object F and performs optical signal to electrical signal conversion to obtain a sensing signal S1. Accordingly, the one or more photoelectric conversion units 20 may be selectively operated between the light emitting mode and the light sensing mode, or selectively operated in the light emitting mode or the light sensing mode, under the control of the control unit 30. In another example, when one or more of the photoelectric conversion units 20 is controlled by the control unit 30 to operate in the light sensing mode, the remaining photoelectric conversion units 20 may be controlled by the control unit 30 to selectively operate in the light emitting mode or the non-light emitting mode. When the OLED display is a small-area display, all the photoelectric conversion units 20 may be controlled to enter the light sensing mode. When the OLED display is a large-area display (for example, having the size of a mobile phone screen), a part of the photoelectric conversion units 20 may be controlled to enter a light sensing mode, but all the photoelectric conversion units 20 may also be controlled to enter the light sensing mode to perform a multi-position light sensing function, such as sensing fingerprints of two, three, four, or five objects (fingers) at the same time. Therefore, the control unit 30 may control the photoelectric conversion unit 20 to operate in the light-emitting mode and/or the light-sensing mode, and such control actions may include: (a) a pure display occasion; (b) a full screen sensing scenario; (c) no display plus partial sensing (e.g., normal black screen condition to unlock); and (d) partial display plus partial sensing (e.g., when operating an application program and requiring fingerprint authentication). In addition, the control unit 30 can control the three primary color photodiodes of the photoelectric conversion units 20 to perform a spectrum separation function to facilitate the anti-counterfeit process, which will be described in detail later.

By controlling the light emitting mode and the light sensing mode, the photoelectric conversion units 20 can perform electro-optical (light emitting) and photoelectric (sensing) conversion at different time points to obtain the functions of display, illumination and light sensing, or the photoelectric conversion units 20 at different positions (by means of geometric planning, the photoelectric conversion units 20 can perform partial light emitting and partial light sensing) perform the electro-optical (light emitting) and photoelectric (sensing) conversion to obtain the functions of display, illumination and light sensing. Therefore, it is not necessary to sacrifice the resolution of the display, to reconfigure the light emitting units of the display, or to insert the light sensing units between the light emitting units of the display, so that the display can have both the display and light sensing functions, and the three primary color photodiodes of the photoelectric conversion units can be controlled to perform the spectrum separation function, which is the most important spirit of the present application.

In addition, the dual-mode display device 100 may further include a display panel protection layer 40 disposed above the photoelectric conversion units 20 and displaying information according to the display light L1. In one example, the display panel protection layer 40 includes a glass substrate or other transparent material, such as a protection tape.

Moreover, the dual-mode display device 100 may further include a touch sensing layer 50 electrically coupled to the control unit 30 and disposed on the display panel protection layer 40 (certainly, with the development of the technology, the touch sensing layer 50 and the display panel protection layer 40 shown herein are not limited to the manufacturing timing or the front-back relationship thereof, for example, some in-cell touch (in-cell touch) technologies integrate the touch technology, and the display panel protection layer is disposed at the outermost portion, in which case, the touch sensing layer 50 is disposed above the photoelectric conversion units 20), and the touch sensing layer 50 senses the touch information of the object F to generate a touch signal S2. Therefore, the control unit 30 may select a Region Of Interest (ROI) according to the touch position corresponding to the touch signal S2, and control at least one Of the photoelectric conversion units 20 located in the ROI to enter the light sensing mode to obtain the sensing signal S1.

Fig. 4A and 4B show two states of the pixel. As shown in fig. 4A and 3, the control unit 30 further controls a first group of the photoelectric conversion units 20 (e.g., the group of the pixels 24 serving as the light emitting unit EM in fig. 4A) to enter a light emitting mode to provide sensing light L2, and controls a second group of the photoelectric conversion units 20 (e.g., the group of the pixels 24 serving as the light receiving unit RC in fig. 4A) to enter a light sensing mode to obtain the sensing signal S1 by using the sensing light L2. Therefore, one part of the photoelectric conversion unit 20 provides the sensing light L2, and the other part is used for light sensing, in which case, the two groups of pixels 24 can be controlled to emit and receive light simultaneously, the first group and the second group of the photoelectric conversion unit 20 can be arranged in a staggered manner, although the staggered arrangement is merely an example for illustrating the application, and any geometric arrangement of the light emitting pixels and the sensing pixels can be controlled by the control unit, and all of them fall within the scope covered by the present application. Note that the sensing light may be provided by another light source, for example, a sensing light source is separately provided, or ambient light is used, and the sensing light is not limited to be provided by the photoelectric conversion unit 20.

Alternatively, as shown in fig. 3 and 4A, the control unit 30 may control the first group and the second group of the photoelectric conversion units 20 to enter a light emitting mode and a light sensing mode, respectively, so as to perform functions of lighting by using the first group and performing light sensing by using the second group. In addition, as shown in fig. 3 and 4B, the control unit 30 can control the first group and the second group of the photoelectric conversion units 20 to enter a light sensing mode and a light emitting mode, respectively, so as to perform functions of lighting by using the second group and performing light sensing by using the first group. Therefore, the data sensed by the first group and the second group can be combined to obtain complete data.

Of course, as shown in fig. 1 to fig. 3, at least one of the photoelectric conversion units 20 may perform a light receiving function (e.g., proximity sensor) after providing the sensing light L2. In this case, the control unit 30 further controls the photoelectric conversion units 20 to enter a light emitting mode to provide a sensing light L2, and the control unit 30 sequentially controls at least one of the photoelectric conversion units 20 to enter the light emitting mode and a light sensing mode according to the touch signal S2 to obtain the sensing signal S1 by using the sensing light L2.

Fig. 5A to 5C are three examples of pixels. As shown in fig. 5A, the photoelectric conversion units 20 at least include a plurality of pixels 24, each pixel 24 includes at least one red photodiode 21, at least one green photodiode 22, and at least one blue photodiode 23, which may be referred to as RGB photodiodes, corresponding to a display pixel (or referred to as a portion of a display pixel). As shown in fig. 5B, a single pixel 24 may include at least one red photodiode 21, at least one green photodiode 22, and two blue photodiodes 23. As shown in fig. 5C, a single pixel 24 may include two red photodiodes 21, two green photodiodes 22, and a blue photodiode 23. As the configuration of the photodiodes is various, which is only illustrated herein, and the present application is not limited thereto, and as the pixel 24 for light emission or light sensing in fig. 4A and 4B, at least one of the photodiodes (R, G, or B) in fig. 5A to 5C may be optionally implemented, that is, in a local activation mode, the control unit 30 only activates R, G one or two of the photodiodes (but not all R, G, B photodiodes) to enter a light sensing mode or a light emitting mode (for example, only emits green light and sensing), which may be used in combination with independently controlling the sub-pixels (the R/G/B photodiodes 21 to 23 may be referred to as sub-pixels).

FIG. 6 is a schematic partial cross-sectional view of a dual mode display device performing a spectral splitting function. As shown in fig. 6, since there are RGB diodes, a function of spectral separation can be performed. Therefore, in each pixel 24, the red photodiode 21, the green photodiode 22 and the blue photodiode 23 arranged adjacently enter a light sensing mode to provide different energy level structures for performing spectrum division sensing. In this case, the red photodiode, the green photodiode, and the blue photodiode that enter the light sensing mode have different energy level structures to perform spectrum separation sensing. For example, the energy level of the red photodiode 21 is relatively narrow in the light sensing mode, the energy level of the green photodiode 22 is next to that of the blue photodiode 23 is relatively wide. Because the energy of the red light R is low, the energy of the green light G is second, and the energy of the blue light B is higher, the blue light B can excite the red photodiode 21, the green photodiode 22, and the blue photodiode 23 to perform photoelectric conversion; the green light G can excite only the red photodiode 21 and the green photodiode 22 for photoelectric conversion, but cannot excite the blue photodiode 23 for photoelectric conversion; the red light R can excite only the red photodiode 21 for photoelectric conversion, but cannot excite the green photodiode 22 and the blue photodiode 23 for photoelectric conversion. Therefore, the red photodiode 21 senses red light, green light, blue light and a mixture thereof to enter the light sensing mode, the green photodiode 22 can only sense green light, blue light and a mixture thereof to enter the light sensing mode, and the blue photodiode 23 can only sense blue light to enter the light sensing mode, although the above photodiodes with different energy levels are determined by material characteristics, and even the energy levels of light emission and light sensing are different, the above description is only used to illustrate an advantage of the present embodiment for spectrum separation, and does not limit a specific spectrum range that each sub-pixel (photodiodes 21 to 23) can sense.

Therefore, in the above example, the plurality of photoelectric conversion units 20 at least have a first energy level structure corresponding to a first energy level (for example, but not limited to, the energy level corresponding to red light), and a second energy level structure corresponding to a second energy level (for example, but not limited to, the energy level corresponding to green light), the second energy level being higher than the first energy level, the control unit 30 controls the photoelectric conversion units 20 having the first energy level structure to receive the corresponding first spectrum to generate the first electric signal, and the control unit 30 controls the photoelectric conversion units 20 having the second energy level structure to receive the corresponding second spectrum to generate the second electric signal, so that the spectrum separation function can be achieved by performing the operation of the first and second electric signals. The distribution ranges of the first spectrum and the second spectrum may be partially overlapping or completely non-overlapping. In addition, the photoelectric conversion units 20 may further have a third energy level structure corresponding to a third energy level (for example, but not limited to, an energy level corresponding to blue light), where the third energy level is higher than the second energy level. The control unit 30 controls the photoelectric conversion units 20 with the third energy level structure to receive the corresponding third spectrum and generate a third electrical signal, and the spectrum separation function can be achieved by performing the operation of the first, second and/or third electrical signals. The first energy level structure, the second energy level structure and the third energy level structure are arranged adjacently. It is noted that the above operations can be performed by the control unit 30, an external computer, or a cloud server, and the distribution ranges of the first, second, and third spectra may be partially overlapped or completely non-overlapped.

Since the spectrum separation can be performed by using the characteristics of the photodiode, the dual mode display device 100 can provide the sensed spectrum information according to the separated spectrum, for example, data required for fingerprint anti-counterfeiting can be applied, for example, the time domain or space domain variation of the sensed data of different spectrums, or the mathematical operation relationship of the sensed data of different spectrums, etc., without providing any color filter, which has the advantages of reducing the cost and simplifying the structure.

Fig. 7A and 7B are schematic partial cross-sectional views of a variation of the dual mode display device of fig. 1 performing a display function and a light sensing function. Referring to fig. 7A and 7B, an example of partial sensing similar to that of fig. 1 is provided. As shown in fig. 7A, in the display mode, the photoelectric conversion unit 20 supplies light L1 for display. As shown in fig. 7B, in the sensing mode, the control unit 30 can simultaneously control a portion of the photoelectric conversion units 20 (e.g., only the left and right photodiodes shown in the schematic illustration) to enter the light emitting mode to provide the sensing light L2 and a portion of the photoelectric conversion units 20 (e.g., only the middle three

photodiodes

21, 22 and 23 shown in the schematic illustration) to enter the light sensing mode, so as to obtain the sensing signal S1 by using the sensing light L2; alternatively, the control unit 30 may sequentially (or non-simultaneously) control the photoelectric conversion units 20 to enter the light emitting mode and control the photoelectric conversion units 20 to enter the light sensing mode according to the touch signal S2, so as to obtain the sensing signal S1 by using the sensing light L2. Therefore, under the sensing mode, the effects of local light emitting and local light sensing can be achieved.

As shown in fig. 8, it should be noted that when the entire dual-mode display device 100 is covered by the plurality of photoelectric conversion units 20 capable of entering the light-emitting mode and the light-sensing mode, a full-screen display application and a full-screen sensing application can be provided, and the sensing area SA3 can selectively provide the sensing function and the display function. When the plurality of photoelectric conversion units 20 capable of entering the light-emitting mode and the light-sensing mode only fill a portion of the dual-mode display device 100 (e.g., within the sensing regions SA1 or SA 2), a local screen sensing application may be provided, and when another portion of the dual-mode display device 100 (e.g., outside the sensing regions SA1 or SA 2), only the photoelectric conversion units having the light-emitting mode may be provided. Accordingly, the claimed scope of the present application encompasses both of these applications. In actual manufacturing, the entire dual-mode display device 100 may be covered with a plurality of photoelectric conversion units 20, and the electronic device 200 mounted with the dual-mode display device 100 may be sold as two or more grades. By using different firmware of the control unit 30, for example, 20%, 50% and 100% of the photoelectric conversion units 20 can be driven to enter the light sensing mode, so that three electronic devices with sensing regions of different sizes SA1, SA2 and SA3 can be created. Of course, a user who originally bought 20% of sensing area SA1 can update the firmware or control characters by paying a fee for account upgrade to 40% of sensing area SA2 or 100% of sensing area SA3 for different experiences. Of course, a user who originally purchased 100% of sensing region SA3 may set the sensing region he or she uses to narrow to any specific sensing region at any ratio and/or specific location to meet the user's needs. In this case, the sensing mode includes a plurality of sub-sensing modes, and the control unit 30 can control the photoelectric conversion units 20 with different ratios to enter the light sensing mode according to the sub-sensing modes. Therefore, the present embodiment has a region of interest configurable (ROI configurable) architecture, allowing the user to configure the region of interest to enter the light sensing mode.

With the above embodiments, the display and the light sensing can be performed by using the photoelectric conversion units in the light emitting mode and the sensing mode, wherein the photoelectric conversion units in the light emitting mode can provide light for display and light for sensing. Because the display does not need to be redesigned and manufactured, and only the circuit driving mode needs to be changed, a large amount of cost is not needed to be consumed, and the due functions of the optical sensor in the screen can be achieved. Moreover, by utilizing the characteristics of the RGB diodes, the spectrum separation can be executed, and sensing data for fingerprint application anti-counterfeiting can be provided without additionally arranging a color filter element, so that the cost can be effectively saved.

The specific embodiments set forth in the detailed description of the preferred embodiments are merely intended to facilitate the description of the technical disclosure of the present application, and do not limit the present application narrowly to the embodiments described above, and variations that do not depart from the spirit of the present application and the scope of the claims are intended to be included herein.

Claims

1. A dual mode display device comprising at least:

a substrate;

a control unit; and

a plurality of photoelectric conversion units disposed on the substrate and electrically coupled to the control unit, wherein:

in a display mode, the control unit controls the plurality of photoelectric conversion units to enter a light emitting mode; and

in a sensing mode, the control unit controls at least one of the plurality of photoelectric conversion units to enter a light sensing mode.

2. The dual-mode display device according to claim 1, wherein the plurality of photoelectric conversion units includes at least a plurality of pixels, each of the pixels including:

at least one red photodiode, at least one green photodiode and at least one blue photodiode constitute a three primary color photodiode.

3. The dual-mode display device of claim 2, wherein each of the pixels further comprises:

at least one transistor, wherein the control unit is electrically coupled to the red photodiode, the green photodiode, and the blue photodiode through the at least one transistor acting as a switch.

4. The dual mode display device of claim 3, wherein in each of the pixels, the red photodiode, the green photodiode, and the blue photodiode entering the light sensing mode have different energy level structures to perform spectrum split sensing, the red photodiode, the green photodiode, and the blue photodiode being arranged adjacently.

5. The dual-mode display device of claim 1, wherein the plurality of photoelectric conversion units comprises at least a transistor layer formed on the substrate, wherein the transistor layer comprises at least a transistor.

6. The dual mode display device of claim 1, further comprising:

the touch sensing layer is electrically coupled to the control unit and senses touch information of an object to generate a touch signal.

7. The dual-mode display device of claim 6, wherein a first group of the plurality of photoelectric conversion units enters the light-emitting mode to provide light for sensing, and a second group of the plurality of photoelectric conversion units is controlled to enter the light-sensing mode to obtain a sensing signal by using the light for sensing, wherein the first group and the second group of the plurality of photoelectric conversion units are arranged in a staggered manner.

8. The dual mode display device of claim 1, wherein the substrate is a glass substrate or a polymeric flexible substrate.

9. The dual-mode display device of claim 1, wherein the dual-mode display device is a micro light-emitting diode display or a display using light-emitting diodes as a display light source.

10. The dual-mode display device of claim 1, wherein the plurality of photoelectric conversion units are arranged in a two-dimensional array, the dual-mode display device having a configurable area of interest configuration, allowing a user to configure an area of interest to enter the light sensing mode.

11. The dual-mode display device of claim 1, wherein the plurality of photoelectric conversion units have at least a first energy level structure corresponding to a first energy level and a second energy level structure corresponding to a second energy level, the second energy level being higher than the first energy level, wherein the control unit controls the plurality of photoelectric conversion units having the first energy level structure to receive corresponding first spectra and generate a first electrical signal, and the control unit controls the plurality of photoelectric conversion units having the second energy level structure to receive corresponding second spectra and generate a second electrical signal, the first energy level structure being arranged adjacent to the second energy level structure.

12. The dual mode display device of claim 11, wherein the plurality of photoelectric conversion units further have a third energy level structure corresponding to a third energy level, wherein the third energy level is higher than the second energy level, wherein the control unit controls the plurality of photoelectric conversion units having the third energy level structure to receive a corresponding third spectrum to generate a third electrical signal, and the first energy level structure and the second energy level structure are arranged adjacent to the third energy level structure.