TWM577976U - Detection device and display device for sensing distance - Google Patents

Abstract

The present invention relates to an inductive device and a display device for sensing a distance, the sensing device for sensing a distance comprising a light emitting portion capable of emitting illumination light for sensing a distance, and a light receiving portion capable of receiving a basis a reflected light reflected from the target object by the illuminating light; and a first band pass filter disposed on the light emitting path of the light emitting portion, in order to make the illuminating light or the interference light reflected from the target object and the display The portion of the transistor does not interfere, but only the wavelength of the non-interference band passes.

Description

Induction device and display device for sensing distance

FIELD OF THE INVENTION The present invention relates to an inductive device and a display device for sensing a distance, and more particularly to an inductive device and a display device for sensing a distance that can reduce interference with a display.

New Background In smart devices such as smart phones and smart tablets, in order to measure the distance of a target object at a certain distance from a face, a hand, or a hair, various sensing devices for sensing the distance can be disposed under the display.

1 is a cross-sectional view showing such an existing sensing device for sensing a distance disposed below the display 3.

As shown in FIG. 1, the existing sensing device for sensing the distance is disposed under the display 3 such as an LCD or an OLED, and the device includes a light emitting portion 1 that emits the illumination light L1 for sensing the distance; the light receiving portion 2 And receiving the reflected light L2 reflected from the target object M based on the irradiation light L1; and the distance measuring unit 4 by using the intensity difference or time difference of the irradiation light L1 and the reflected light L2, the time of flight (TOF) , time of flight, etc., measuring the distance from the object M.

For example, when the object object M has a simple form such as a plane, a face, or the like, the distance of the object object M is measured such that when the illumination light L1 emits light of a certain intensity, the amount of the reflected light L2 is the object object M As a function of the distance from the light-emitting portion 1, generally, the shorter the distance between the target object M and the light-emitting portion 1, the more the reflected light L2 exhibits a stronger characteristic, thereby estimating the distance of the target object M. For the distance measurement of the object M having a more complicated form, it may include measuring the change in accordance with the time of the reflected light L1 reflected from the target object by irradiating the light-emitting portion 1 at a specific time, and measuring the light-emitting portion 1 and the target object M. The ToF (Time of Flight) method of the distance between the light receiving units 3.

Here, the light-emitting portion 1 may employ, for example, an LED or the like that can generate the illumination light L1 of 850 nm or 940 nm, and the light-receiving portion 2 can adopt a reflection light L2 capable of receiving reflection from the target object M. Photodiode and so on.

Here, the display 3, which typically employs a thin film transistor (TFT), or the like, may include a transistor T portion including at least one source S (source) for driving the active region A. , drain D (drain) and gate G (gate).

However, the illumination light L1 emitted from the LED or the interference light L3 reflected from the target object M is absorbed by the gate G and the active region A of the active region A, based on the photoelectric effect, that is, photoelectric The photo conductive effect phenomenon or stimulates the active area A, so that there is an on or off based on the illumination light L1 in an on or off state of the display 3 ( Off), a flashing flicker phenomenon occurs on the screen.

Therefore, the existing sensing device for sensing the distance operates in a state in which the LCD or OLED is completely turned off or on a frame portion (bezel) to which a portion of the sensing device for sensing the distance is attached and which does not overlap the LCD or the OLED. As a result, there is a problem that the space utilization rate due to the unnecessary frame area is lowered.

Further, as another example of the conventional sensing device for sensing the distance, the distance image sensor is composed of one light-emitting unit 1, the light-receiving unit 2 having a plurality of pixels, and the distance measuring unit 4, even if it is provided Under the LCD or OLED, flicker is also caused, so that the problem cannot be solved.

SUMMARY OF THE INVENTION The present invention provides an inductive device and a display device for sensing a distance. Since the sensing device does not require a bezel area, space utilization is high, and even if it is disposed below the screen, flickering of the screen can be prevented. However, this technical problem is for illustrative purposes and is not intended to limit the scope of the present invention. [Means for solving technical problems]

In order to solve the technical problem, the sensing device for sensing distance based on the technical idea of the present invention may include: a light emitting portion capable of emitting illumination light for sensing a distance; and a light receiving portion capable of receiving based on the illumination light a reflected light reflected from the object object; and a first band pass filter disposed on the light emitting path of the light emitting portion and for causing the irradiation light or the interference light reflected from the object object and the transistor portion of the display No interference occurs, but only the wavelength of the non-interference band passes.

Further, according to the present invention, the wavelength of the non-interference band may be from 1.2 micrometers to 1.55 micrometers.

In addition, according to the present invention, the first band pass filter may be a silicon filter, a glass passband on glass, a silicon on glass, and combinations thereof. At least one of the components.

In addition, the sensing device for sensing distance according to the present invention may further include a second band pass filter disposed on the path of the received light of the light receiving portion, in order to receive only the wavelength of the non-interference band, Only the wavelength of the non-interference band is passed.

In addition, in order to solve the technical problem, a display device based on the idea of the present invention includes a display formed with at least one transistor portion; and sensing means for sensing a distance disposed under the display; the sensing distance The sensing device includes: a light emitting portion capable of emitting illumination light for sensing a distance; a light receiving portion capable of receiving reflected light reflected from the target object based on the illumination light; and a distance measuring portion that utilizes the illumination light and Determining an intensity ratio of the reflected light or a distance between the illumination light and the reflected light (TOF, time of flight) and the target object; and a first band pass filter disposed in the In the light-emitting path of the light-emitting portion, only the wavelength of the non-interference band is passed in order to prevent the irradiation light or the interference light reflected from the target object from interfering with the transistor portion of the display.

Further, according to the present invention, the display may be an LCD display or an OLED display, and the transistor includes at least one source, drain for driving an active area of the display And the gate (gate). [effect of utility model]

According to an embodiment of the present invention constructed as described above, by using the first band pass filter or the second band pass filter, it is possible to construct a sensing for sensing distance that can prevent display malfunction due to interference light such as a flicker phenomenon or the like. Device and display device. Of course, the scope of the present invention is not limited to the above effects.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms different from each other. The following examples are provided to more fully disclose the disclosure of the present invention and to provide a more complete disclosure of the scope of the present invention to those skilled in the art. Moreover, the size of the constituent elements in the drawings may be exaggerated or reduced for convenience of explanation.

2 is a cross-sectional view showing the sensing device 100 and the display device 1000 for sensing distance according to some embodiments of the present invention.

As shown in FIG. 2, the sensing device 100 for sensing distance according to some embodiments of the present invention may mainly include a light emitting unit 10, a light receiving unit 20, a first band pass filter F1, and a second band pass filter F2.

For example, as shown in FIG. 2, the light-emitting portion 10 is a device capable of generating the illumination light L1 for sensing the distance, and an LED capable of generating general light can be employed. However, the light-emitting portion 10 is not necessarily limited to this, and various types of light-emitting elements capable of generating light of various wavelength bands may be employed.

Further, for example, as shown in FIG. 2, the light-receiving portion 20 is a device that can receive the reflected light L2 reflected by the target object M based on the irradiation light L1, and various forms of photodiodes, thermophilic can be employed. , thermoelectric elements, photoconductors, etc.

Further, for example, as shown in FIG. 2, the first band pass filter may be a filter disposed on a light emitting path of the light emitting portion 10 and in order to make the illumination light L1 or from the target object The interference light L3 reflected by M does not interfere with the portion of the transistor T of the display 30, but passes only the wavelength of the non-interference band.

For example, the wavelength of the non-interference band of the first band pass filter F1 as the wavelength of the near-infrared band may be the gate G of the active area A of the activatable display 30 and the interference with the active area A, which may be excluded. The wavelength of the non-interference band outside the wavelength of the short band.

More preferably, for example, the non-interference band may have a wavelength of from 1.1 micrometers to 1.55 micrometers. A TFT used for adjusting the light emission of an image in an LCD or an OLED can form an active area (A) by using poly-silicon. Further, the polycrystalline germanium can react with light having a wavelength of 1.1 μm or less, and does not react with light having a wavelength of 1.1 μm or more.

Therefore, in such near-infrared rays, since the wavelength of the non-interference band (1.2 um to 1.55 um) is not absorbed in the gate G and the active region A of the transistor T portion of the display 30, Passing directly, so that the active area (A) based on the activation of the gate G is not affected, so that in all cases of on/off of the screen, the screen can be prevented from flashing in advance when the sensor is working. A misoperation of flashing phenomenon such as flashing.

The first band pass filter F1 may be a silicon filter, a glass passband filter on glass, or a silicon on glass filter.

The first band pass filter F1 can adjust the wavelength band of the passing wavelength according to the characteristics of the material or the laminated characteristics or the manufacturing method, etc. This filter manufacturing method has been disclosed and widely used. Therefore, the detailed description thereof is omitted here.

Further, for example, as shown in FIG. 2, the second band pass filter F2 may be a filter disposed on a path of the received light of the light receiving portion 20 and in order to receive only the non-interference band The wavelength passes only the wavelength of the non-interference band.

Here, the second band pass filter F2 may be a filter that causes only the non-interference band in the reflected light L2 reflected from the target object M in order to receive only the wavelength of the non-interference band The wavelength of the passage.

For example, the wavelength of the non-interference band of the second band pass filter F2 as the wavelength of the non-interference band may be the illumination light L1 passing through the first band pass filter F1 or reflected from the target object M In the reflected light L2, the wavelength of the non-interference band other than the wavelength of the short wavelength band of the active region A of the subsequent activated display 30 is excluded.

In addition, if the subject of the sensor is an object such as skin or hair, a higher surface reflectance is required, and since the skin reflectance is drastically reduced at 1.5 μm or more, light having a wavelength below the band is preferred. Used in proximity sensors.

More specifically, for example, the wavelength of the non-interference band may be 1.2 micrometers to 1.55 micrometers.

Therefore, since the light-receiving portion 20 receives only light having a wavelength of the specific wavelength band, the distance can be more accurately measured by excluding light of other wavelength bands.

The second band pass filter F2 may be a silicon filter or a glass pass band on glass, a silicon on glass filter.

The second band pass filter F2 can adjust the wavelength band of the passing wavelength according to the characteristics of the material or the laminated characteristics or the manufacturing method, etc. This filter manufacturing method has been disclosed and widely used. Therefore, the detailed description thereof is omitted here.

Further, the second band pass filter F2 may be substantially the same as the first band pass filter F1. However, it is not necessarily limited thereto. For example, in order to reduce flicker, the first band pass filter F1 may form a narrower band and the second band pass filter F2 may form a wider band. The sensing area is widened, or the second band pass filter F2 may be omitted.

Thereby, by using the first band pass filter F1 or the second band pass filter F2, erroneous operation of the display 30 caused by interference light such as a flicker phenomenon can be prevented by using the second band pass The filter F2 can take out the reflected light other than the interference light so that the distance can be measured more accurately.

In addition, as shown in FIG. 2, the display device 1000 according to some embodiments of the present invention may include a display 30 and a sensing device 100 for sensing a distance disposed under the display 30. The display device 1000 is formed with at least one electric device. Part T of the crystal.

Here, as shown in FIG. 2, the display 30 may be an LCD display or an OLED display, and the transistor T may include at least one source S, bungee that can drive the active area A of the display 30. D (drain) and gate G (gate).

Further, the sensing device 100 for sensing the distance may include: a light emitting portion 10 capable of emitting the illumination light L1 for sensing the distance; and a light receiving portion 20 capable of receiving the reflection from the object object M based on the illumination light L1 The reflected light L2; the distance measuring unit 40 measures the intensity of the illumination light L1 and the reflected light L2 or the time of flight (TOF, time of flight) of the illumination light L1 and the reflected light L2 a distance between the target objects M; a first band pass filter F1 disposed on the light-emitting path of the light-emitting portion 10 and for causing the illumination light L1 or the interference light L3 reflected by the target object M The transistor T portion of the display 30 does not interfere, but passes only the wavelength of the non-interference band; and the second band pass filter F2 is disposed on the path of the received light of the light receiving portion 20 and In order to receive only the wavelength of the non-interference band, only the wavelength of the non-interference band is passed.

Here, the configuration and function of the sensing device 100 for sensing the distance may be the same as the sensing device for sensing distance according to the above-described partial embodiment of the present invention. Therefore, the description thereof is omitted here.

Further, the distance measuring unit 40 measures the distance by using the characteristic that the intensity ratio of the irradiation light L1 and the reflected light L2 is a function of the distance from the target object M, or measures the light output of the irradiation light L1 based on the consideration of the speed of light. The TOF is calculated from the difference between the time point and the light-receiving time point of the reflected light L2, and the distance from the target object M can be calculated by converting the TOF into a distance. This way of measuring distance has been disclosed and widely used. Therefore, the detailed description thereof is omitted here.

Therefore, by utilizing such a near-infrared long-wavelength and non-interference-wavelength wavelength, since the interference light L3 is not absorbed by the active area A of the transistor T portion of the display 30 but passes directly, The influence is based on the active area A in which the gate G is activated, so that an erroneous operation such as a flickering phenomenon in which the screen flickers based on the operation of the sensor at the time of switching the screen can be prevented in advance.

At the same time, by using the second band pass filter F2, it is possible to use reflected light other than the interference light, so that the distance can be measured more accurately.

In addition, the inductor 100 for measuring distance of the present invention is not limited to the drawings, and various sensors such as a distance image sensor may be employed.

The present invention has been described with reference to an embodiment illustrated in the accompanying drawings, which is only for exemplification, and those skilled in the art should understand that various modifications and modifications can be made based on the above embodiments. The fact that there are other embodiments equivalent thereto. Therefore, the true technical protection scope of the present invention should be determined based on the technical idea attached to the scope of the patent application.

1,10‧‧‧Lighting Department

2,20‧‧‧Lighting Department

3,30‧‧‧ display

4,40‧‧‧Distance Measurement Department

100‧‧‧Induction device for sensing distance

1000‧‧‧ display device

A‧‧‧active area

D‧‧‧汲

F1‧‧‧first bandpass filter

F2‧‧‧Second bandpass filter

G‧‧‧ gate

L1‧‧‧ Illumination

L2‧‧‧ reflected light

L3‧‧‧Interference light

M‧‧‧ object

S‧‧‧ source

T‧‧‧O crystal

1 is a cross-sectional view illustrating a conventional sensing device for sensing a distance. 2 is a cross-sectional view showing a sensing device and a display device for sensing a distance according to some embodiments of the present invention.

Claims (6)

An inductive device for sensing a distance, characterized in that the device comprises: a light emitting portion capable of emitting illumination light for sensing a distance; a light receiving portion capable of receiving reflected light reflected from the object object based on the illumination light And a first band pass filter disposed on the light emitting path of the light emitting portion and only for causing the irradiation light or the interference light reflected from the target object to interfere with the transistor portion of the display, and only The wavelength of the non-interference band passes. The sensing device for sensing a distance according to claim 1, wherein the non-interference band has a wavelength of 1.2 μm to 1.55 μm. The sensing device for sensing a distance according to claim 1, wherein the first band pass filter comprises a silicon filter, a glass passband on glass, At least one of Silicon On Glass and a combination thereof is constructed. The sensing device for sensing a distance according to claim 1, further comprising a second band pass filter disposed on a path of the received light of the light receiving portion and in order to receive only the non- The wavelength of the interference band is crossed, and only the wavelength of the non-interference band is passed. A display device comprising: a display formed with at least one transistor portion; and sensing means for sensing a distance disposed under the display; the sensing device for sensing a distance comprising: a light emitting portion capable of transmitting An illumination light for sensing a distance; a light receiving unit capable of receiving reflected light reflected from the target object based on the illumination light; and a distance measuring unit that utilizes an intensity ratio of the illumination light and the reflected light or the illumination light Measuring a distance from the target object by a time of flight (TOF) of the reflected light; and a first band pass filter disposed on the light emitting path of the light emitting portion and for the illumination The light or the interference light reflected from the object object does not interfere with the transistor portion of the display, but only passes the wavelength of the non-interference band. The display device of claim 5, wherein the display is an LCD display or an OLED display, the transistor comprising at least one source for driving an active area of the display , drain and gate.