CN112133723A

CN112133723A - Photosensitive module, display device and electronic equipment

Info

Publication number: CN112133723A
Application number: CN201910558306.1A
Authority: CN
Inventors: 刘永明; 丁新敏; 胡俊
Original assignee: Nanchang OFilm Biometric Identification Technology Co Ltd
Current assignee: Nanchang OFilm Biometric Identification Technology Co Ltd
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2020-12-25
Also published as: WO2020258533A1

Abstract

The application relates to a sensitization module, set up in one side that the light-permeable display panel kept away from the plain noodles. The light emitting surface of the display panel comprises a first polaroid, and the photosensitive module comprises a first optical sensor, a second optical sensor and a second polaroid. The optical axes of the first polarizer and the second polarizer are mutually vertical, and the second polarizer is arranged between the second optical sensor and the display panel. Thus, the first light sensor can receive ambient light as well as light generated by the display panel, while the second light sensor can only receive light generated by the display panel. The current ambient light size can be obtained by calculating the light ray difference value received by the first light sensor and the second light sensor. This application still relates to the display device and the electronic equipment who equip above-mentioned sensitization module, because do not need trompil on display panel to monitor ambient light, be favorable to realizing the full screen, promote the user and use experience.

Description

Photosensitive module, display device and electronic equipment

Technical Field

The application relates to the field of electronic equipment, especially, relate to a avoid sensitization module of display surface trompil to and adopt display device and electronic equipment of this sensitization module.

Background

Current electronic devices are typically provided with an ambient light sensor that is mostly used to monitor the intensity of ambient light in order to automatically adjust the display brightness of the screen, and a proximity sensor that is mostly used to automatically turn off the screen when the user answers the phone. Many of these sensors are disposed below the screen, and usually require a hole on the screen to receive external light. In the process of developing electronic equipment towards a full screen, the traditional sensor using mode does not meet the requirements of users. How to accurately detect the ambient light on the premise of avoiding the hole opening is a technical problem to be solved at present.

Disclosure of Invention

The application provides an utilize two optical sensor to replace and establish the sensitization module of trompil in order to receive the ambient light on the screen, specifically include following technical scheme:

the utility model provides a sensitization module sets up in one side that the play plain noodles was kept away from to light-permeable display panel, display panel's play plain noodles is including first polaroid, sensitization module includes:

a first light sensor for receiving the ambient light passing through the first polarizer and the light generated by the display panel;

the second optical sensor is adjacent to the first optical sensor, the second polarizer is located between the second optical sensor and the display panel, the optical axis of the first polarizer is perpendicular to the optical axis of the second polarizer, and the second optical sensor is used for receiving light generated by the display panel, so that the current ambient light can be obtained by calculating the light ray difference value received by the first optical sensor and the second optical sensor.

This application sensitization module utilizes first light sensor with the device difference on the respective light path of second light sensor has realized first light sensor receives the light that external environment light sum display panel produced simultaneously, and the effect of the light that display panel produced is only received to the second light sensor. The optical axes of the first polaroid and the second polaroid are mutually perpendicular and matched, so that the transmission of ambient light to the second optical sensor can be effectively avoided. Through calculating the difference that first light sensor with light is sensed separately to the second light sensor, can calculate the luminous intensity of environment light, and then reach the effect that still can accurate perception external environment light under the condition that does not set up the trompil on display panel. This application mobile terminal utilizes also first light sensor with the cooperation work of second light sensor has replaced original structure of trompil on display panel to guarantee the uniformity of display panel outward appearance, promoted user experience.

Wherein the display panel is an oled panel. The display panel needs to be transparent to external light, so the oled panel in the current mainstream display type better meets the use requirement of the scheme of the application.

The light source module further comprises a support, a first accommodating space and a second accommodating space are formed in the support, the first optical sensor is fixed in the first accommodating space, the second optical sensor is fixed in the second accommodating space, and a separation structure is arranged between the first accommodating space and the second accommodating space and used for separating light rays. The bracket is used for supporting the first optical sensor and the second optical sensor, and the separating structure is used for separating the light rays in the first accommodating space and the second accommodating space, so that the first optical sensor and the second optical sensor can not be interfered by light leakage.

The bracket faces one side of the display panel and is further provided with a light-transmitting cover plate, and the light-transmitting cover plate is used for supporting and fixing the second polaroid, so that the structural stability of the second polaroid is improved.

The first optical sensor and the second optical sensor are both inclined to the display panel, and photosensitive surfaces of the first optical sensor and the second optical sensor are both inclined towards the display panel along directions close to each other, so that the first optical sensor and the second optical sensor both face the same display area of the display panel to receive light generated by the display panel. The first light sensor and the second light sensor both receive light generated by the display panel towards the same display area, and the difference of the light incident quantity caused by different display pictures can be eliminated.

The first optical sensor is over against a first area of the display panel to collect light generated by the first area, the second optical sensor is over against a second area of the display panel to collect light generated by the second area, and the photosensitive module is further used for calculating the difference value of the image brightness of the first area and the second area in real time and correcting the current ambient light according to the difference value. The size of the ambient light obtained by calculation is corrected by calculating the difference value of the image brightness of the first area and the second area, and the ambient light detection precision of the photosensitive module can also be improved.

The first optical sensor is over against a first area of the display panel to collect light generated by the first area, a light splitter is further arranged between the first optical sensor and the display panel and used for projecting part of the light generated by the first area to the first optical sensor, and meanwhile, the light splitter is used for projecting the other part of the light generated by the first area to the second optical sensor through the second polarizer. The light generated by the first area is uniformly distributed to the first light sensor and the second light sensor by using the light splitter, which is also a way to eliminate the brightness difference of the display picture.

Wherein the first light sensor is disposed toward the display panel, the second light sensor is perpendicular to the first light sensor and the second light sensor is toward the beam splitter. The second optical sensor is perpendicular to the first optical sensor and is matched with the light path of the optical splitter to receive part of light rays of the first area.

The first optical sensor and the second optical sensor face the display panel, the photosensitive module further comprises a reflector, and the reflector is used for refracting partial light projected to the second optical sensor by the light splitter so that the second optical sensor receives the partial light. Utilize the reflector panel makes first light sensor with the second light sensor all faces display panel sets up, is favorable to controlling this application sensitization module's thickness.

The application also relates to a display device and electronic equipment, wherein the display device comprises a light-transmitting display panel and the photosensitive module, and the electronic equipment also comprises the photosensitive module. It can be understood that, the display device and the electronic equipment adopting the photosensitive module avoid the opening on the display panel, ensure the appearance consistency of the electronic equipment and improve the user experience.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments of the present application will be briefly described below.

FIG. 1 is a schematic diagram of a photosensitive module according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of a photosensitive module according to another embodiment of the present disclosure;

FIG. 3 is a schematic view of a photosensitive module according to another embodiment of the present disclosure;

FIG. 4 is a schematic view of a photosensitive module according to another embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely 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.

Please refer to fig. 1, which illustrates an electronic device 100 of the present application, disposed on a side of the light-transmissive display panel 30 away from the light-emitting surface 31. The display panel 30 generally includes a first polarizer 41, and the first polarizer 41 may be used to eliminate light reflection of ambient light in the display panel 30 and to perform polarization filtering on incident ambient light. The display panel 30 includes a light emitting surface 31 and a back surface 32 opposite to the light emitting surface 31. The first polarizer 41 is disposed on one side of the light emitting surface 31. The electronic apparatus 100 further includes a photosensitive module 200, wherein the photosensitive module 200 includes a first photo sensor 10, a second photo sensor 20 and a second polarizer 42. The first optical sensor 10 is disposed on a side of the display panel 30 away from the light exit surface 31, that is, the first optical sensor 10 is disposed on a side of the back surface 32 of the display panel 30. After the ambient light enters the display panel 30 through the first polarizer 41 from the outside, part of the ambient light is reflected by the display panel 30. The reflected light cannot be emitted from the display panel 30 due to the first polarizer 41, so that the first polarizer 41 eliminates the reflection of the light. While another portion of the light passes through the display panel 30 and exits the rear face 32. The first light sensor 10 is used to receive the portion of light, which is the light path of the ambient light propagating toward the first light sensor 10 in the photosensitive module 200 of the present application. Further, the first light sensor 10 is also used for receiving light generated by the display panel 30 itself. It is understood that the electronic device 100 will display images to the user through the display panel 30. The display panel 30 itself emits light. The light emitted from the display panel 30 is also emitted from the back surface 32 to reach the position of the first light sensor 10. Therefore, in the photosensitive module 200 of the present application, the first light sensor 10 detects the ambient light and the light emitted from the display panel 30 simultaneously.

The second photosensor 20 is disposed at one side of the first photosensor 10, and is disposed adjacent to the first photosensor. A second polarizer 42 is also provided between the second light sensor 20 and the display panel 30. That is, the light emitted from the back surface 32 needs to pass through the second polarizer 42 before reaching the second light sensor 20. Unlike the first light sensor 10, after passing through the first polarizer 41, the ambient light is filtered according to the polarization direction of the light, that is, only the light polarized toward the first direction is allowed to pass through. When passing through the second polarizer 42, the light transmitted by the first polarizer 41 is filtered again according to the polarization direction of the light, and only the light polarized toward the second direction is allowed to pass through. That is, most of the ambient light can be blocked by the first and second polarizers 41 and 42 by matching the first and second directions. Generally, the optical axis of the first polarizer 41 and the optical axis of the second polarizer 42 form an included angle to block the ambient light from continuously passing through the first polarizer 41 and the second polarizer 42. Theoretically, the angle is set to 90 degrees, which is the best effect, when the optical axis of the first polarizer 41 is perpendicular to the optical axis of the second polarizer 42, no external environment light passes through the second polarizer 42 to reach the second light sensor 20. And the light generated by the display panel 30 itself may pass through the second polarizer 42 directly to the second light sensor 20. That is, the second light sensor 20 may receive only light generated by the display panel 30 by the cooperation of the second polarizing plate 42 and the first polarizing plate 41.

Since the first light sensor 10 and the second light sensor 20 are adjacently arranged, when the first light sensor 10 and the second light sensor 20 are in close proximity, the light generated by the display panel 30 received by the first light sensor 10 and the second light sensor 20 is approximately uniform. Therefore, the first light sensor 10 may receive the ambient light, which causes a difference between the intensity of the light sensed by the first light sensor 10 and the intensity of the light sensed by the second light sensor 20. Therefore, by calculating the light ray difference value received by the first optical sensor 10 and the second optical sensor 20 at the same time, the current ambient light level can be calculated, so as to identify the current environment and scene where the electronic device 100 is located. Further, the electronic device 100 may automatically adjust the display brightness of the display panel 30 according to the current ambient light intensity, so as to improve the user experience. The photosensitive module 200 can also perform ranging based on the intensity of ambient light, so as to automatically turn off the screen when the user uses the electronic device 100 to answer a call. This application sensitization module 200 is because first light sensor 10 and second light sensor 20's setting and cooperation for display panel 30 also can sense ambient light under the condition of not trompil, has replaced the structure of current trompil on display panel 30, thereby has guaranteed electronic equipment 100's outward appearance uniformity, has increaseed electronic equipment 100 and has realized the possibility of full screen, has promoted user experience.

It should be noted that the wavelength band of the ambient light is not strictly limited in the present application. That is, in the present embodiment, the first light sensor 10 and the second light sensor 20 may simultaneously sense visible light, or the first light sensor 10 and the second light sensor 20 may simultaneously sense infrared light. It can be understood that, as long as the light wavelength bands sensed by the first light sensor 10 and the second light sensor 20 are the same, the light intensity difference can be obtained by matching and comparing the two, and the intensity of the external environment light can be identified based on the difference. And products such as current polaroid, light sensor all can reach the function that covers 300 ~ 1100nm wavelength light simultaneously, consequently this application sensitization module 200 can only be used for monitoring visible light or infrared light, also can monitor visible light and infrared light simultaneously, as long as first light sensor 10 and second light sensor 20 are unanimous at the light wavelength of same monitoring moment, all can reach the function of response ambient light intensity.

On the other hand, the display panel 30 needs to be of a type that can transmit ambient light to perform the function of emitting the ambient light into the first light sensor 10. In the current mainstream display technology, the oled panel can achieve corresponding effects. Of course, the electronic module 100 of the present application is not limited to the display panel using oled technology, and as long as the Qled panel and the panel using other display technologies that may appear in the future can achieve the ambient light penetrating function, the electronic module can be used as the display panel of the electronic device 100 of the present application, and achieve the effect similar to oled panel. Further, since the display panel 30 can penetrate the ambient light at any position of the light emitting surface 31, in the electronic device 100 of the present application, the first light sensor 10 and the second light sensor 20 can be disposed at any position relative to the light emitting surface 31. Since there is no need to punch holes in the display panel 30, the first and second

light sensors

10 and 20 are disposed at any positions without affecting the display effect of the display panel 30.

With continued reference to fig. 1, in order to position the first optical sensor 10 and the second optical sensor 20 in the electronic device 100, the photosensitive module 200 is further provided with a bracket 50. The holder 50 has a first receiving space 51 and a second receiving space 52 formed therein. The first receiving space 51 and the second receiving space 52 are both open to the display panel 30 for light to enter. A partition structure 53 is further provided between the first and

second housing spaces

51 and 52. The first optical sensor 10 is fixedly disposed in the first housing space 51, and the second optical sensor 52 is fixedly disposed in the second housing space 52. The ambient light and the light generated by the display panel 30 enter the first and second receiving

spaces

51 and 52, respectively, to be received by the first and second

light sensors

10 and 20, respectively. The separating structure 53 is further configured to separate light rays in the first receiving space 51 and the second receiving space 52, so as to prevent light leakage between the first receiving space 51 and the second receiving space 52 and influence the light sensing accuracy of the first light sensor 10 and the second light sensor 20.

In one embodiment, since the second polarizer 42 is a film or sheet structure with low structural strength, a transparent cover 60 is further disposed on the side of the frame 50 facing the display panel 30. The second polarizer 42 is attached and fixed on the transparent cover 60, so that the second polarizer 42 can be stably supported in the photosensitive module 200 and filter the ambient light for the second light sensor 20. It should be noted that the light-transmitting cover 60 needs to have a high light transmittance, so as to prevent the ambient light and the light generated by the display panel 30 from being lost during the process of passing through the light-transmitting cover 60 to affect the light-sensing accuracy of the first light sensor 10 and the second light sensor 20. On the other hand, the transparent cover 60 may cover only the second receiving space 52, or may cover both the first receiving space 51 and the second receiving space 52. The transparent cover plate 60 always causes a certain light intensity loss, and when the transparent cover plate 60 covers the first receiving space 51 and the second receiving space 52 at the same time, the influence of the transparent cover plate 60 on the light intensity is transmitted to the first light sensor 10 and the second light sensor 20 at the same time, so that the light intensity difference between the first light sensor 10 and the second light sensor 20 caused by the transparent cover plate 60 is eliminated.

Referring to fig. 2, in one embodiment, the first optical sensor 10 and the second optical sensor 20 are arranged along a first direction 001, the first optical sensor 10 and the second optical sensor 20 are both inclined to the display panel 30, and the light sensing surfaces of the first optical sensor 10 and the second optical sensor 20 are both inclined toward the display panel 30 along a direction approaching each other, that is, the first optical sensor 10 is inclined toward the second optical sensor 20 along the first direction 001, and the second optical sensor 20 is also inclined toward the first optical sensor 10 along the first direction 001. The angle of the two inclined towards each other is related to the viewing angle of the two and the distance from the display panel 30, so that the first light sensor 10 and the second light sensor 20 both receive the light generated by the display panel 30 towards the same display area of the display panel 30. As mentioned above, since the first light sensor 10 and the second light sensor 20 are adjacently arranged, when the first light sensor 10 and the second light sensor 20 are close to each other, the light generated by the display panel 30 received by the first light sensor 10 and the second light sensor 20 is approximately uniform. However, as the resolution of the display panel is higher and higher, even the adjacent display regions may have different light intensities emitted from the display panel 30 due to different frames. The first optical sensor 10 and the second optical sensor 20 are tilted toward each other to receive light generated by the display panel 30 toward the same display area, so that the difference of the light incident amount caused by different display frames can be eliminated, and the accuracy of ambient light sensing is improved.

In another embodiment, the first light sensor 10 and the second light sensor 20 are arranged in parallel along the first direction 001, the first light sensor 10 faces the first region 301 of the display panel 30 to collect light generated from the first region 301, and the second light sensor 20 faces the second region 302 of the display panel 30 to collect light generated from the second region 302. The photosensitive module 200 is further configured to calculate a difference value between the image brightness of the first region 301 and the image brightness of the second region 302 in real time, and substitute the difference value into a contrast value of the ambient light detection as a correction to the ambient light intensity. The size of the ambient light obtained by calculation is corrected by calculating the difference value of the image brightness between the first area and the second area, and the ambient light detection precision of the photosensitive module 200 can also be improved.

Referring to the embodiment of fig. 3, the first light sensor 10 faces the first area 301 of the display panel 30 to collect light generated by the first area 301. A beam splitter 70 is also provided between the first light sensor 10 and the display panel 30. The spectroscope 70 includes a spectroscopic surface 701. After reaching the splitting plane 701, the light is divided into two groups of polarized lights with mutually perpendicular polarization directions, and the light intensities of the two groups of polarized lights are equally divided. One set of polarized light is transmitted from the beam splitter 70 directly to the first light sensor 10, and the other set of polarized light is projected to the second light sensor 20 after passing through the second polarizer 41 in the first direction 001. The optical splitter 70 is a commonly used optical element in optical design, and its uniform light splitting characteristic is suitable for the ambient light sensing scheme of the photosensitive module 200 of the present application. Because both the first light sensor 10 and the second light sensor 20 receive the ambient light incident from the first area 301 and the light generated by the first area 301. After the light is equally divided by the beam splitter 70, the intensity of the light transmitted toward the first light sensor 10 is the same as the intensity of the light projected toward the second light sensor 20. And after the light projected toward the second light sensor 20 passes through the second polarizer 42, the ambient light thereof is blocked by the second polarizer 42. Thus, the first light sensor 10 receives light with intensity that is generated by the ambient light and the first area 301, and the second light sensor 20 receives light with intensity that is generated by the first area 301. By comparing the two, the intensity of the ambient light can still be calculated. Meanwhile, the light generated from the first region 301 is uniformly distributed to the first photosensor 10 and the second photosensor 20 by the beam splitter 70, which is also a way to eliminate the brightness difference of the display screen.

In the embodiment of fig. 3, the first light sensor 10 is disposed toward the display panel 30, and the second light sensor 20 is disposed perpendicular to the first light sensor 10, such that the second light sensor 20 faces the beam splitter 70 and receives the second set of polarized light reflected by the beam splitter 70. The second polarizer 42 is disposed between the second light sensor 20 and the beam splitter 70. The second light sensor 20 is disposed perpendicular to the first light sensor 10, and can be matched with the optical path of the beam splitter 70, and is opposite to the beam splitter 70 to receive the polarized light of the first area 301.

In the embodiment of fig. 4, the photosensitive module 200 is further provided with a reflective plate 80. The reflection plate 80 is used to reflect the set of polarized light projected by the beam splitter 70 toward the second light sensor 20 so that the set of polarized light is projected perpendicularly onto the second light sensor 20. Therefore, the first light sensor 10 and the second light sensor 20 are both disposed toward the display panel 30, and the increase of the thickness of the electronic device 100 when the second light sensor 20 is disposed perpendicular to the first light sensor 10 is avoided. The light path of the light projected to the second light sensor 20 is changed by the reflector 80, so that the first light sensor 10 and the second light sensor 20 are both disposed toward the display panel 30, which is beneficial to controlling the thickness of the electronic device 100 and realizing the light and thin design of the electronic device 100.

The application also relates to a display device (not shown). The display device includes the transparent display panel 30 and the photosensitive module 200. It can be understood that, similar to the electronic device 100 related to this application, the display device also avoids the condition that the opening hole is used for light sensing on the display panel 30 after including the display panel 30 and the photosensitive module 200, ensures the appearance consistency of the display device, can be applied to various electronic products as a full-screen display device with photosensitive function, and improves the user experience.

The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.

Claims

1. The utility model provides a sensitization module sets up in one side that the play plain noodles was kept away from to light-permeable display panel, display panel's play plain noodles is including first polaroid, its characterized in that, sensitization module includes:

2. The photosensitive module of claim 1, further comprising a bracket, wherein the bracket defines a first receiving space and a second receiving space, the first optical sensor is fixed in the first receiving space, the second optical sensor is fixed in the second receiving space, and a separation structure is disposed between the first receiving space and the second receiving space for separating light.

3. The photosensitive module of claim 2, wherein a transparent cover is further disposed on a side of the bracket facing the display panel, and the transparent cover is used for supporting and fixing the second polarizer.

4. The photosensitive module according to any one of claims 1 to 3, wherein the first and second photosensors are tilted with respect to the display panel, and photosensitive surfaces of the first and second photosensors are tilted toward the display panel along a direction of approaching each other, so that the first and second photosensors receive light generated by the display panel toward a same display region of the display panel.

5. The photosensitive module according to any one of claims 1 to 3, wherein the first photo sensor faces a first area of the display panel to collect light generated by the first area, the second photo sensor faces a second area of the display panel to collect light generated by the second area, and the photosensitive module is further configured to calculate a difference value between the brightness of the first area and the brightness of the second area in real time, and correct the current ambient light according to the difference value.

6. The photosensitive module according to any one of claims 1 to 3, wherein the first photo sensor faces the first region of the display panel to collect light generated by the first region, and a beam splitter is further disposed between the first photo sensor and the display panel, and the beam splitter is configured to project a portion of light generated by the first region to the first photo sensor, and simultaneously project another portion of light generated by the first region to the second photo sensor through the second polarizer.

7. The photosensitive module of claim 6, wherein the first photo sensor is disposed toward the display panel, the second photo sensor is perpendicular to the first photo sensor, and the second photo sensor is disposed toward the beam splitter.

8. The photosensitive module of claim 6, wherein the first photo sensor and the second photo sensor are both disposed toward the display panel, and the photosensitive module further comprises a reflective plate for refracting a portion of light projected by the beam splitter to the second photo sensor so that the second photo sensor receives the light.

9. A display device comprising a light-transmissive display panel and the photosensitive module of any one of claims 1 to 8.

10. An electronic device, characterized in that the electronic device comprises the photosensitive module according to any one of claims 1 to 8.