WO2021217308A1

WO2021217308A1 - Color and illuminance sensor under display

Info

Publication number: WO2021217308A1
Application number: PCT/CN2020/087075
Authority: WO
Inventors: 闵丙日
Original assignee: 杭州芯格微电子有限公司
Priority date: 2020-04-26
Filing date: 2020-04-26
Publication date: 2021-11-04
Also published as: CN112088292A

Abstract

A color and illuminance sensor (100, 400, 401, 402, 403, 404, 600) under a display (10) comprises: a light selection layer (200, 201, 202) having a first light path and a second light path in which circularly polarized display light (22) generated by external light entered from the outside of the display (10) advances and non-polarized light (30) generated by pixels (P) advance; a color light filtering layer (320, 430, 432, 630) disposed under the light selection layer (200, 201, 202) such that light which has passed through the first light path and the second light path passes through at different wavebands; and a light sensor (300, 440, 442, 640) disposed under the color light filtering layer (320, 430, 432, 630) and having a first light receiving unit (311) and a second light receiving unit (312). The first light receiving unit (311) detects light that has passed through the first light path, and the second light receiving unit (312) detects light that has passed through the second light path. The first light path allows both the circularly polarized display light (22) and the non-polarized light (30) to pass through, and the second light path blocks the circularly polarized display light (22) and allows the non-polarized light (30) to pass through.

Description

Color illuminance sensor at the bottom of the display

Technical field

The present invention relates to a color illuminance sensor.

Background technique

Illuminance sensors are not only used in portable electronic devices such as mobile phones and tablet computers, but also in video electronic devices such as TVs or monitors. The illuminance sensor is a sensor that senses the brightness around the electronic device. Recently, designs in which displays occupy almost the entire front of electronic devices have gradually increased. Although the size of the display has become larger according to the demand for large screens, in order to install the camera, especially to install the illuminance sensor, it is still necessary to ensure at least a part of the front area. Although proximity sensors using ultrasonic waves can also be applied to a structure whose front is covered by a display, it is difficult to integrate an illuminance sensing function. In addition, although the illuminance sensor can also be arranged in other areas than the front, it may not be able to sense the surrounding light because of the housing, which is used to protect electronic devices. Therefore, although the most ideal position for installing the illuminance sensor is the front of the electronic device, it is difficult to ensure a position where the illuminance sensor is commonly used in a design where the display occupies the entire front.

Summary of the invention

The object of the present invention is to provide a color illuminance sensor that can be applied to an electronic device designed so that the display occupies the entire front surface.

A color illuminance sensor at the lower part of a display is provided. The color illuminance sensor at the lower part of the display is arranged in the lower part of the display and measures the brightness of the surroundings of the display. The upper display retardation layer and the display polarization layer. The color illuminance sensor at the lower part of the display may include: a light selection layer having a first light path and a second light path, the first light path and the second light path being a display circle generated by external light incident from the outside of the display The polarized light and the non-polarized light generated by the pixel travel on the optical path; the color filter layer is arranged at the lower part of the light selection layer, so that the light after passing through the first optical path and the second optical path are in different wavelength bands Through; and a photosensor, disposed under the color filter layer, has a first light receiving portion and a second light receiving portion, the first light receiving portion detects light passing through the first optical path, the first The second light receiving unit detects the light passing through the second optical path. The first optical path allows the circularly polarized light of the display and the non-polarized light to pass through, and the second optical path blocks the circularly polarized light of the display , And allow the non-polarized light to pass through.

As an embodiment, the light selection layer may include: a sensor retardation layer for the circularly polarized light to enter the display and having orthogonal slow and fast axes; a first sensor polarization layer located on the sensor retardation layer The lower part of the sensor has a polarization axis inclined at a first angle with respect to the slow axis; and a second sensor polarization layer is located at the lower part of the sensor retardation layer and has a polarization axis inclined at a second angle with respect to the slow axis. Polarization axis. Wherein, the sensor retardation layer and the first sensor polarization layer form the first optical path, and the sensor retardation layer and the second sensor polarization layer can form the second optical path.

As an example, the plurality of first sensor polarization layers and the plurality of second sensor polarization layers may be alternately arranged on the same plane.

As an embodiment, the light selection layer may include: a first sensor retardation layer for the circularly polarized light of the display to enter, and having a first slow axis and a first fast axis that are orthogonal; a second sensor retardation layer for The display is circularly polarized light incident, and has a second slow axis and a second fast axis that are orthogonal; and a sensor polarization layer, located at the lower part of the first sensor retardation layer and the second sensor retardation layer, and has A polarization axis inclined at a first angle with respect to the first slow axis. Wherein, the first slow axis and the second slow axis may be orthogonal, the first sensor retardation layer and the sensor polarizing layer may form the first optical path, and the second sensor retardation layer and the sensor The sensor polarization layer may form the second optical path.

As an embodiment, the plurality of first sensor delay layers and the plurality of second sensor delay layers may be alternately arranged on the same plane.

As an embodiment, the light selection layer may include: a first sensor retardation layer for the circularly polarized light of the display to enter, and having a first slow axis and a first fast axis that are orthogonal; a second sensor retardation layer for The display is circularly polarized light incident, and has a second slow axis and a second fast axis orthogonal; the first sensor polarization layer is located at the lower part of the first sensor retardation layer and the second sensor retardation layer, and Has a polarization axis inclined at a second angle with respect to the first slow axis; and a second sensor polarization layer, located at the lower part of the first sensor retardation layer and the second sensor retardation layer, and has a The first slow axis is an axis of polarization that is inclined at a first angle. Wherein, the first slow axis and the second slow axis may be orthogonal.

As an embodiment, a plurality of the first sensor retardation layers and a plurality of the second sensor retardation layers may be alternately arranged on a first plane, and a plurality of the first sensor polarization layers and a plurality of the second sensor The sensor polarization layers can be alternately arranged on the second plane.

As an embodiment, the first light receiving unit may detect the linearly polarized light of the first sensor generated from the circularly polarized light of the display and the linearly polarized light of the second sensor generated from the non-polarized light. The light receiving unit may detect the linearly polarized light of the third sensor generated from the non-polarized light.

As an embodiment, the light selection layer may include: a sensor retardation layer for the circularly polarized light to enter the display, and has an orthogonal slow axis and fast axis; a sensor polarization layer, located at the lower part of the sensor retardation layer , And has a polarization axis inclined at a second angle with respect to the slow axis. Wherein, the sensor retardation layer and the sensor polarization layer may be provided only on the upper part of the second light receiving part.

As an embodiment, the color filter layer may be composed of a plurality of repeated filter units, and the filter unit consists of 2n×N (where N and n are natural numbers greater than or equal to 1, and N is a color filter. The type) is composed of color filters, and the filter unit includes 2n color filters of the same kind.

As an example, in the filter unit, the first light-receiving part may be arranged at the lower part of the n same-color filters of the 2n same-color filters, and the second light-receiving parts may be respectively It is arranged at the lower part of the remaining n filters of the same kind.

As an embodiment, in the filter unit, two color filters of the same kind may be arranged in contact with each other.

As an embodiment, in the filter unit, two color filters of the same type may be arranged apart.

As an embodiment, the light sensor can measure the brightness of light of N different wavelength bands through N color filters.

As an embodiment, the plurality of first light receiving parts and the plurality of second light receiving parts respectively measure the brightness of light emitted from the sensor detection area defined by the lower surface of the display, and the plurality of measured values can be It is used to calculate the average brightness of the light emitted from the detection area of the sensor.

The color illuminance sensor according to the embodiment of the present invention can be applied to an electronic device designed such that the display occupies the entire front surface.

Description of the drawings

Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings. For ease of understanding, in all the drawings, the same constituent elements are denoted by the same reference numerals. The structure shown in the drawings is only an embodiment schematically shown for explaining the present invention, and does not limit the scope of the present invention. In particular, in order to facilitate the understanding of the invention, some constituent elements are shown somewhat exaggerated in the drawings. Since the drawings are for understanding the means of the invention, it should be understood that the width, thickness, etc. of the constituent elements shown in the drawings may change in actual implementation.

FIG. 1 is a diagram for exemplarily explaining the operating principle of the color illuminance sensor at the lower part of the display.

FIG. 2 is a diagram for exemplarily explaining an embodiment of the light selection layer shown in FIG. 1.

FIG. 3 is a diagram for exemplarily explaining another embodiment of the light selection layer shown in FIG. 1.

Fig. 4 is an exploded perspective view for exemplarily illustrating an embodiment of the color illuminance sensor at the lower part of the display.

FIG. 5 is an exploded perspective view for exemplarily explaining another embodiment of the color illuminance sensor at the lower part of the display.

FIG. 6 is an exploded perspective view for exemplarily explaining still another embodiment of the color illuminance sensor at the lower part of the display.

FIG. 7 is an exploded perspective view for exemplarily illustrating still another embodiment of the color illuminance sensor at the lower part of the display.

8 and 9 are diagrams exemplarily showing filter units constituting the color filter layer.

10 and 11 are diagrams exemplarily showing detection areas according to the arrangement of a plurality of the same color filters constituting a color filter pair.

FIG. 12 is a diagram for exemplarily explaining still another embodiment of the color illuminance sensor in the lower part of the display.

FIG. 13 is an exploded perspective view for exemplarily explaining the color illuminance sensor at the lower part of the display shown in FIG. 12.

Detailed ways

The present invention can incorporate various modifications and can have various embodiments. Specific embodiments are shown in the drawings and described in detail. It should be understood that this does not limit the present invention to specific embodiments, but includes all modifications, equivalents, and alternatives that fall within the concept and technical scope of the present invention. In particular, the functions, features, and embodiments described below with reference to the drawings can be implemented alone or in combination with another embodiment. Therefore, it should be noted that the scope of the present invention is not limited to the manner shown in the drawings.

On the other hand, with regard to the terms used in this specification, expressions such as "substantially", "almost", "about", etc. are expressions taking into consideration allowable margins or possible errors when substantially realized. For example, "substantially 90 degrees" should be interpreted as including angles that can obtain the same effects as those at 90 degrees. For another example, "almost none" should be interpreted as including to the extent that even if there is a little, it can be ignored.

On the other hand, unless specifically mentioned, “side” or “horizontal” refers to the left-right direction of the drawing, and “vertical” refers to the up-down direction of the drawing. In addition, unless otherwise defined, the angle, incident angle, etc. are based on a virtual straight line perpendicular to the horizontal plane shown in the drawings.

In all the drawings, the same or similar elements use the same reference signs.

The sensor 100 at the lower part of the display is arranged at the lower part of the display 10. The display 10 includes: a pixel layer 13 formed with a plurality of pixels P that generate light; a display polarizing layer 11 and a display retardation layer 12 laminated on top of the pixel layer 13. In order to protect the display polarizing layer 11, the display retardation layer 12, and the pixel layer 13, a protective layer may be provided on the bottom surface of the display 10. The protective layer is made of opaque material, such as metal or synthetic resin. As an embodiment, the sensor 100 at the lower part of the display composed of the light selection layer 200 and the light sensor 300 may be disposed in an area where a part of the protective layer is removed (hereinafter referred to as the completed structure). As another embodiment, the light selection layer 200 of the sensor 100 at the lower part of the display can be manufactured in the form of a film and laminated on the bottom surface of the display 10. The light sensor 300 is attached to the bottom surface of the light selection layer 200, so that a color illuminance sensor at the lower part of the display (hereinafter referred to as an assembly structure) can also be realized. In the following, in order to avoid repetition, the description is centered on the completed structure.

The display polarizing layer 11 and the display retardation layer 12 improve the visibility of the display 10. The external light 20 incident through the upper surface of the display 10 is unpolarized light. If the external light 20 is incident on the upper surface of the display polarizing layer 11, only the linearly polarized light 21 of the display substantially consistent with the polarization axis of the display polarizing layer 11 passes through the display polarizing layer 11. If the display linearly polarized light 21 passes through the display retardation layer 12, a display circularly polarized light (or elliptically polarized light) 22 that rotates in a clockwise or counterclockwise direction is formed. If the display circularly polarized light 22 is reflected by the pixel layer 13 and re-incident to the display retardation layer 12, a second linearly polarized light is formed. Here, if the polarization axis of the display retardation layer 12 is inclined by about 45 degrees with respect to the slow axis, the polarization axis of the display linearly polarized light 21 and the polarization axis of the second linearly polarized light are orthogonal to each other. Therefore, the second linearly polarized light, that is, the external light reflected by the pixel layer 13 is blocked by the display polarizing layer 11, and thus cannot be emitted to the outside of the display. Therefore, the visibility of the display 10 can be improved.

The unpolarized light 30 generated by the pixel P travels not only to the upper surface of the display 10 but also to the bottom surface. In addition, a part of the unpolarized light 30 that travels toward the upper surface is reflected inside the display 10 and travels toward the bottom surface again. Unlike the display circularly polarized light 22, the non-polarized light 30 directly passes through the display retardation layer 12, and forms linearly polarized light through the display polarized light layer 11 and is emitted to the outside.

The sensor 100 at the lower part of the display includes: a light selection layer 200 having two light paths; and a light sensor 300 that detects light passing through each light path. The light incident on the sensor 100 at the lower part of the display is the circularly polarized light 22 of the display generated by external light and the unpolarized light 30 generated inside the display. The first optical path and the second optical path in the light selection layer 200 have different effects on the circularly polarized light 22 and the non-polarized light 30 of the display. The first optical path allows both the circularly polarized light 22 and the unpolarized light 30 of the display to pass through. Conversely, the second optical path allows unpolarized light 30 to pass and substantially blocks the circularly polarized light 22 of the display. The display circularly polarized light 22 after passing through the first optical path becomes the first sensor linearly polarized light 23, and the unpolarized light 30 after passing through the first optical path and the second optical path becomes the second sensor linearly polarized light 31 and the third sensor linearly polarized light 32 .

The optical sensor 300 includes a first light receiving part 311 corresponding to the first optical path and a second light receiving part 312 corresponding to the second optical path. For example, the first light receiving section 311 generates a first pixel current that is substantially proportional to the amount of circularly polarized light 22 and unpolarized light 30 of the display, and the second light receiving section 312 generates a first pixel current that is substantially proportional to the amount of light of unpolarized light 30. The second pixel current. The

light receiving portion

311 or 312 may be composed of, for example, one photodiode or a plurality of photodiodes (hereinafter referred to as PD array). As an embodiment, one or two photodiodes may correspond to one pixel P. As another embodiment, the PD array may correspond to one pixel P. As yet another embodiment, one or two photodiodes may correspond to multiple pixels P. As yet another embodiment, the PD array may correspond to a plurality of pixels P. Here, the first light receiving unit 311 and the second light receiving unit 312 can jointly detect any one of light belonging to different wavelength bands such as red, green, blue, and white.

The color illuminance sensor is a device that measures the brightness of light in at least two or more wavelength bands in order to measure the brightness of external light. When the color illuminance sensor is arranged in the lower part of the display, not only the external light passing through the display, but also the light generated inside the display will also be incident on the color illuminance sensor. Therefore, in order to accurately measure the brightness of light belonging to at least two or more wavelength bands at the same time, it is necessary to measure the brightness of the light generated inside the display. If only the brightness of the light generated inside the display can be measured, it can be used to correct the measured brightness of the light of different wavelength bands.

As described above, the second sensor linearly polarized light 31 and the third sensor linearly polarized light 32 generated by the unpolarized light 30 can be detected by the first light receiving unit 311 and the second light receiving unit 312, respectively. In particular, since the linearly polarized light inside the sensor generated by the circularly polarized light 22 of the display through the light selection layer 200 cannot substantially enter the second light receiving section 312, the second light receiving section 312 can only measure the second light receiving section 312 generated by the non-polarized light 30. The brightness of the linearly polarized light 32 of the three sensors. In addition, the brightness of the second sensor linearly polarized light 31 and the third sensor linearly polarized light 32 may be substantially the same, but on the contrary, they may also be different, which will be described in detail below. However, since the linearly polarized light 31 of the second sensor and the linearly polarized light 32 of the third sensor are generated from the unpolarized light 30 generated by one or more pixels, there is a linear proportional relationship or a nonlinear ratio between the brightness of the two. relation. The non-linear proportional relationship may be caused by various reasons such as the structural feature of the display 10, the difference of the pixel regions corresponding to each light receiving unit, and the wavelength band of the unpolarized light 30. The proportional relationship between the linearly polarized light 31 of the second sensor and the linearly polarized light 32 of the third sensor can be measured in an environment that is not affected by external light. According to the proportional relationship, the degree to which the second sensor linearly polarized light 31 contributes to the brightness measured by the first light receiving unit 311 can be calculated based on the brightness of the third sensor linearly polarized light 32 measured by the second light receiving unit 312. As a result, it is possible to accurately measure the brightness of light in different wavelength bands individually and at the same time.

In all the drawings below, the hatching line shown in the retardation layer represents the direction of the slow axis, and the hatching line shown in the polarizing layer exemplarily represents the polarization axis with respect to the slow axis extending in the horizontal direction. direction. In addition, the figure shows that the slow axis of the display retardation layer and the slow axis of the sensor retardation layer both extend in the horizontal direction, or the slow axis of the display retardation layer and the slow axis of the sensor retardation layer both extend in the vertical direction. It should be understood that this is only a simple expression for ease of understanding, and it is not necessary to align the slow axis of the sensor retardation layer with the slow axis of the display retardation layer. In addition, in order to simplify the drawing, with respect to the unpolarized light emitted from the pixel P, only the light emitted through the light selection layer is shown.

The light selection layer 200 includes a sensor retardation layer 120, a first sensor polarization layer 110 and a second sensor polarization layer 115. The sensor retardation layer 120 is arranged on the upper part of the first sensor polarization layer 110 and the second sensor polarization layer 115, and the optical sensor 300 is arranged on the lower part of the first sensor polarization layer 110 and the second sensor polarization layer 115. A color filter layer 320 is arranged between the first sensor polarization layer 110 and the second sensor polarization layer 115 and the photosensor 300, and the color filter layer 320 limits the wavelength band of the light incident to the light receiving portion 310. The light receiving unit 310 of the photosensor 300 is composed of a first light receiving unit 311 and a second light receiving unit 312. The first light receiving part 311 is arranged at the lower part of the first sensor polarizing layer 110, and the second light receiving part 312 is arranged at the lower part of the second sensor polarizing layer 115. As an embodiment, the light selection layer 200 may be manufactured by laminating (laminating) the sensor retardation layer 120 on the upper surfaces of the first sensor polarizing layer 110 and the second sensor polarizing layer 115. The light selection layer 200 may be attached to the bottom surface of the display 10. The light sensor 300 may be attached to the bottom surface of the light selection layer 200. As another embodiment, the light sensor 300 may be implemented by a thin film transistor. Therefore, the color illuminance sensor 100 at the lower part of the display can be manufactured by laminating the film-shaped sensor retardation layer 120, the first and second sensor polarization layers 110, 115, and the photosensor 300.

The polarization axis of the first sensor polarization layer 110 and the polarization axis of the second sensor polarization layer 115 are inclined at different angles with respect to the slow axis of the sensor retardation layer 120. The polarization axis of the first sensor polarization layer 110 is inclined at a first angle, for example +45 degrees, with respect to the slow axis of the sensor retardation layer 120, and the polarization axis of the second sensor polarization layer 115 is relative to that of the sensor retardation layer 120. The slow axis is inclined at a second angle, for example -45 degrees.

The first light receiving unit 311 of the photosensor 300 detects the first sensor linearly polarized light 23 and the second sensor linearly polarized light 31 emitted from the first sensor polarization layer 110, and the second light receiving unit 312 detects the polarized light from the second sensor. The third sensor linearly polarized light 32 emitted from the layer 115 detects it. The light receiving unit 310 can generate a pixel current having a magnitude corresponding to the amount of light in each wavelength band. The light receiving unit 310 may be, for example, a photodiode, but it is not limited to this.

The color filter layer 320 is located between the light sensor 300 and the light selection layer 200. Specifically, the color filter layer 320 can be composed of, for example, red (R), green (G), blue (B), and white (W) filters. Each color filter may be substantially located vertically above the first light receiving portion 311 or the second light receiving portion 312. The color filter allows light belonging to a specific wavelength band to pass and blocks light that does not belong to a specific wavelength band. The color filter layer 320 will be described in detail with reference to FIGS. 4 to 11.

Next, the operation of the color illuminance sensor 100 at the lower part of the display having the light selection layer 200 having the above-mentioned structure will be described.

The display circularly polarized light 22 and unpolarized light (30 in FIG. 1, not shown in FIGS. 4 to 11) are incident on the upper surface of the light selection layer 200, that is, the upper surface of the sensor retardation layer 120. The display circularly polarized light 22 is light after the external light 20 has passed through the display polarizing layer 11 and the display retardation layer 12, and the non-polarized light 30 is light traveling downward from the pixel P toward the light selection layer 200.

The display polarizing layer 11 may have a polarizing axis inclined at a second angle, for example -45 degrees, with respect to the slow axis of the display retardation layer 12. Therefore, the linearly polarized light 21 of the display after passing through the display polarizing layer 11 may be incident at a second angle with respect to the slow axis of the display retardation layer 12. If the first polarized light portion of the display linearly polarized light 21 transmitted along the fast axis and the second polarized light portion of the display linearly polarized light 21 transmitted along the slow axis pass through the display retardation layer 12, there will be λ between each other. /4 phase difference. Therefore, the linearly polarized light 21 of the display after passing through the display retardation layer 12 can become the circularly polarized light 22 of the display rotating in the counterclockwise direction.

The display circularly polarized light 22 having a phase difference of λ/4 between the fast axis and the slow axis passes through the sensor retardation layer 120 to become the sensor internal linearly polarized light 22a. The polarization axis of the linearly polarized light 22a inside the sensor and the polarization axis of the display linearly polarized light 21 are orthogonal to each other. On the other hand, the unpolarized light 30 directly passes through the sensor retardation layer 120.

The polarization axis of the first sensor polarization layer 110 and the polarization axis of the sensor internal linear polarization 22a are substantially parallel, so the sensor internal linear polarization 22a emitted from the sensor retardation layer 120 can pass through the first sensor polarization layer 110. Conversely, the polarization axis of the second sensor polarization layer 115 is substantially perpendicular to the polarization axis of the linearly polarized light 22a inside the sensor, so the linearly polarized light 22a inside the sensor can be blocked by the second sensor polarization layer 115. In addition, the unpolarized light 30 emitted from the sensor retardation layer 120 passes through the first sensor polarization layer 110 and the second sensor polarization layer 115 to become the second sensor linearly polarized light 31 and the third sensor linearly polarized light 32. The linearly polarized light 23 of the first sensor, the linearly polarized light 31 of the second sensor, and the linearly polarized light 32 of the third sensor pass through the same type of color filter (hereinafter referred to as the same type of color filter), and then enter the light sensor 300. In other words, the first light receiving unit 311 can detect the linearly polarized light 23 of the first sensor and the linearly polarized light 31 of the second sensor through the first optical path composed of the sensor retardation layer 120 and the first sensor polarized light layer 110. The second light path formed by the sensor retardation layer 120 and the second sensor polarization layer 115, and the second light receiving portion 312 can detect the linearly polarized light 32 of the third sensor.

The light selection layer 201 includes a first sensor retardation layer 120, a second sensor retardation layer 125, and a sensor polarization layer 110. The first sensor retardation layer 120 and the second sensor retardation layer 125 are arranged on the upper part of the sensor polarization layer 110, and the photosensor 300 is arranged on the lower part of the sensor polarization layer 110. A color filter layer 320 is arranged between the sensor polarization layer 110 and the photosensor 300, and the color filter layer 320 limits the wavelength band of the light incident on the light receiving unit 310. The first light receiving portion 311 of the photosensor 300 is arranged at a position where the light emitted from the first sensor retardation layer 120 passes through the sensor polarizing layer 110, and the second light receiving portion 312 is arranged on the light emitted from the second sensor retardation layer 125 The position reached after passing through the sensor polarized light layer 110. As an embodiment, the light selection layer 201 may be manufactured by laminating the first sensor retardation layer 120 and the second sensor retardation layer 125 on the upper surface of the sensor polarization layer 110. The light selection layer 201 may be attached to the bottom surface of the display 10. The light sensor 300 may be attached to the bottom surface of the light selection layer 201. As another embodiment, the light sensor 300 may be implemented by a thin film transistor. Therefore, the color illuminance sensor 100 at the lower part of the display can be manufactured by laminating the film-shaped first and second sensor retardation layers 120 and 125, the sensor polarizing layer 110, and the photosensor 300.

The slow axis of the first sensor delay layer 120 and the slow axis of the second sensor delay layer 125 are substantially orthogonal. The polarization axis of the sensor polarization layer 110 may be inclined at a first angle, for example +45 degrees, with respect to the slow axis of the first sensor retardation layer 120, or at a second angle, for example, with respect to the slow axis of the second sensor retardation layer 125. -45 degree tilt.

The first light receiving portion 311 of the photosensor 300 is located vertically below the first sensor delay layer 120, so as to detect the first sensor linearly polarized light 23 and the second sensor linearly polarized light 31, the first sensor linearly polarized light 23 and the second sensor linearly polarized light 31 The linearly polarized light 31 of the second sensor is the light emitted by the circularly polarized light 22 of the display through the first sensor retardation layer 120 and the sensor polarization layer 110. The second light receiving portion 312 of the photosensor 300 is located vertically below the second sensor delay layer 125, so as to detect the linearly polarized light 32 of the third sensor. The

light receiving parts

311 and 312 can generate a pixel current having a magnitude corresponding to the amount of light detected. The light receiving unit 310 can generate a pixel current having a magnitude corresponding to the amount of light of different wavelength bands. The light receiving unit 310 may be, for example, a photodiode, but it is not limited to this.

Next, the operation of the color illuminance sensor 100 at the lower part of the display having the light selection layer 201 having the above-mentioned structure will be described. The description of the circularly polarized light 22 and the non-polarized light 30 of the display is the same as that of FIG. 2, so the description is omitted.

The display circularly polarized light 22 and unpolarized light (30 in FIG. 1, not shown in FIGS. 4 to 11) are directed toward the upper surface of the light selection layer 201, that is, the first sensor retardation layer 120 and the second sensor retardation layer 125 Incident on the upper surface. The display circularly polarized light 22 having a phase difference of λ/4 between the fast axis and the slow axis passes through the first sensor retardation layer 120 to become the first sensor internal linearly polarized light 22b, and passes through the second sensor retardation layer 125 to become the second sensor. 2. Linearly polarized light 22c inside the sensor. The slow axis of the first sensor retardation layer 120 and the slow axis of the second sensor retardation layer 125 are orthogonal, so the polarization axis of the linearly polarized light 22b inside the first sensor and the polarization axis of the linearly polarized light 22c inside the second sensor can also be Orthogonal. Specifically, the display circularly polarized light 22 having a phase difference of λ/4 between the first polarized light part and the second polarized light part passes through the first sensor retardation layer 120 to cancel the phase difference, and can become the inside of the first sensor. Linearly polarized light 22b. The internal linearly polarized light 22b of the first sensor has a polarization axis substantially parallel to the polarization axis of the linearly polarized light 21 of the display. On the contrary, the circularly polarized light 22 of the display increases the phase difference of λ/4 through the second sensor retardation layer 125, so that it can become the internal linear polarized light 22c of the second sensor. The polarization axis is perpendicular to the polarization axis. On the other hand, the unpolarized light 30 directly passes through the first and second sensor retardation layers 120, 125.

Although the first sensor internal linearly polarized light 22b emitted from the first sensor retardation layer 120 passes through the sensor polarization layer 110, the second sensor internal linearly polarized light 22c emitted from the second sensor retardation layer 125 cannot pass through the sensor polarization layer. 110. The sensor polarization layer 110 may have a polarization axis tilted at a first angle, for example -45 degrees, with respect to the slow axis of the first sensor retardation layer 120, or at a second angle, with respect to the slow axis of the second sensor retardation layer 125, For example, +45 degrees tilted polarization axis. Thus, the polarization axis of the linearly polarized light 22b inside the first sensor is substantially parallel to the polarization axis of the sensor polarization layer 110, so the linearly polarized light 22b inside the first sensor can pass through the sensor polarization layer 110 almost without loss. Conversely, the polarization axis of the linearly polarized light 22c inside the second sensor is substantially perpendicular to the polarization axis of the sensor polarizing layer 110, so the linearly polarized light 22c inside the second sensor can be blocked by the sensor polarizing layer 110. In addition, the unpolarized light 30 that has passed through the first and second sensor retardation layers 120 and 125 passes through the sensor polarization layer 110 to become the second sensor linearly polarized light 31 and the third sensor linearly polarized light 32. The linearly polarized light 23 of the first sensor, the linearly polarized light 31 of the second sensor, and the linearly polarized light 32 of the third sensor are incident on the light sensor 300 after passing through the same color filter. In other words, the first light receiving unit 311 can detect the first sensor linearly polarized light 23 and the second sensor linearly polarized light 31 through the first optical path formed by the first sensor retardation layer 120 and the sensor polarization layer 110. On the other hand, the second light receiving unit 312 can detect the linearly polarized light 32 of the third sensor through the second optical path composed of the second sensor retardation layer 125 and the sensor polarization layer 110.

FIG. 4 is an exploded perspective view for exemplarily illustrating an embodiment of the color illuminance sensor at the lower part of the display, and relates to a structure in which the light selection layer shown in FIG. 2 is applied.

As described above, the color illuminance sensor 400 at the lower part of the display can be manufactured by stacking the sensor retardation layer 410, the sensor polarization layer 420, the color filter layer 430, and the light sensor 440. Here, at least the sensor retardation layer 410 and the sensor polarizing layer 420 may be film-shaped.

The sensor delay layer 410 may be the first sensor delay layer 120 formed with a slow axis in a substantially horizontal manner as a whole.

The sensor polarization layer 420 is disposed under the sensor delay layer 410. The sensor polarization layer 420 may be formed by alternately arranging the first sensor polarization layer 110 and the second sensor polarization layer 115 having different polarization axes along the first direction. The first sensor polarizing layer 110 and the second sensor polarizing layer 115 may have a rectangular shape extending along the second direction. Here, the polarization axis of the first sensor polarization layer 110 may be inclined at a first angle with respect to the slow axis of the sensor retardation layer 410, and the polarization axis of the second sensor polarization layer 115 may be relative to that of the sensor retardation layer 410. The slow axis is inclined at a second angle.

The color filter layer 430 is disposed under the polarizing layer 420 of the sensor. The color filter layer 430 can pass light belonging to a specific wavelength band and block light belonging to the remaining wavelength bands. The color filter layer 430 may include, for example, a red filter CF _R _{that only allows light in the red wavelength band to pass, a green filter CF G} that only allows light in the green wavelength band to pass, and a blue filter that only allows light in the blue wavelength band to pass. The filter CF _B _{and the white filter CF W} that only pass light in the white wavelength band. The color filter included in the color filter layer 430 can be arranged vertically above the light receiving part in a manner corresponding to each light receiving part of the light sensor 440. In the drawings, the color filter layer 430 is shown as an independent film like the sensor retardation layer 410 and the sensor polarization layer 420, but this is only an example. In other words, the color filter may be formed on the light sensor 440 in advance.

The color filter layer 430 is composed of a plurality of repeated filter units (Unit Pattern). In the filter unit, the number of the same color filters is a multiple of 2, that is, 2n (where n≥1), and there are N different color filters in the filter unit. 2n color filters of the same kind are configured to be in contact with each other, that is, they are configured so that there are no other types of color filters (hereinafter referred to as heterogeneous color filters) between two color filters of the same kind, or they are It is configured to be separated by a certain distance (that is, there are a certain number of different color filters between two same color filters).

Due to the sensor retardation layer 410 and the sensor polarizing layer 420, light with a relatively large amount of light and light with a relatively small amount of light pass through the color filter layer 430. Here, the light with a relatively large amount of light may be the linearly polarized light 23 of the first sensor and the linearly polarized light 31 of the second sensor, and the light with a relatively small amount of light may be the linearly polarized light 32 of the third sensor. Comparison between the people. Among the 2n color filters of the same kind included in the filter unit, n color filters only allow light of a specific wavelength band contained in light with a relatively large amount of light to pass, and the remaining n color filters only make light amount Relatively small light contains specific wavelengths of light passing through. For example, among the first and second red filters included in the filter unit, the first red filter only allows light in the red wavelength band included in light with a relatively large amount of light to pass, and the second color filter only Allows light in the red wavelength band included in light with a relatively small amount of light to pass.

The light sensor 440 is disposed under the color filter layer 430. The light sensor 440 includes at least a pair of light receiving

units

311 and 312 that detect light belonging to the same wavelength band. The at least one pair of light receiving

parts

311 and 312 respectively correspond to at least one pair of color filters of the same kind included in the color filter layer 430. The plurality of light receiving

parts

311 and 312 output pixel currents having a magnitude corresponding to the amount of light incident through the color filter. The wavelength band of the light detected by the first light receiving portion 311 and the second light receiving portion 312 is determined according to the type of the color filter that is substantially located vertically above. The pair of light-receiving

parts

311 and 312 are substantially the same light-receiving parts, and the first light-receiving part 311 at the position where the relatively large amount of light belonging to the same wavelength band is incident is marked with the subscript "B", and the light-receiving parts belonging to the same wavelength band are marked as "B". The second light receiving portion 312 at a position where light with a relatively small amount of light is incident is denoted by the subscript "D".

The first sensor polarized light layer 110 of the sensor polarized light layer 420 allows the first sensor linearly polarized light 23 and the second sensor linearly polarized light 31 to pass (ie, the first optical path), so along the length of the first sensor polarized light layer 110 The light receiving part arranged in the lower part of the first sensor polarizing layer 110 in the second direction is the first light receiving part 311. On the contrary, the second sensor layer 115 only allows the linearly polarized light 32 of the third sensor to pass (ie, the second optical path), so it is arranged in the second sensor polarized light along the length direction of the second sensor polarized layer 115, that is, the second direction. The light-receiving part at the lower part of the layer 115 is the second light-receiving part 312.

FIG. 5 is an exploded perspective view for exemplarily illustrating another embodiment of the color illuminance sensor at the lower part of the display, involving the application of the structure of the light selection layer shown in FIG. 3. The description of the same parts as in FIG. 4 is omitted, and only the differences are described.

The color illuminance sensor 401 at the lower part of the display may include a sensor retardation layer 411, a sensor polarization layer 421, a color filter layer 430, and a light sensor 440.

The sensor delay layer 411 may be formed by alternately arranging a first sensor delay layer 120 having a first slow axis and a second sensor delay layer 125 having a second slow axis in the first direction. Here, the first slow axis and the second slow axis may be substantially orthogonal. The first sensor delay layer 120 and the second sensor delay layer 125 may have a rectangular shape extending in the second direction. Here, the first slow axis may be inclined at a first angle with respect to the polarization axis of the sensor polarization layer 421, and the second slow axis may be inclined at a second angle with respect to the polarization axis of the sensor polarization layer 421.

The sensor polarization layer 421 is disposed under the sensor delay layer 411. The sensor polarizing layer 421 may be the first sensor polarizing layer 110 formed with a polarization axis in the same manner as a whole.

The color filter layer 430 is disposed under the polarizing layer 421 of the sensor, and the color filter layer 430 is composed of a plurality of repeated filter units. The light sensor 440 is disposed under the color filter layer 430. The light sensor 440 includes at least a pair of light receiving

units

311 and 312 that detect light belonging to the same wavelength band.

The sensor polarized light layer 421 allows the linearly polarized light 22b inside the first sensor and the linearly polarized light 31 of the second sensor after passing through the first sensor retardation layer 120, so it is along the length direction of the first sensor retardation layer 120, that is, the second direction The light receiving part arranged at the lower part of the sensor polarization layer 111 is the first light receiving part 311. On the contrary, the second sensor polarization layer 115 only allows the third sensor linearly polarized light 32 after passing through the second sensor retardation layer 125 to pass, so it is arranged in the sensor polarization along the length direction of the second sensor retardation layer 125, that is, the second direction. The light receiving part at the lower part of the light layer 111 is the second light receiving part 312.

FIG. 6 is an exploded perspective view for exemplarily explaining still another embodiment of the color illuminance sensor at the lower part of the display. The description of the same parts as those in FIGS. 4 and 5 will be omitted, and only the differences will be described.

The color illuminance sensor 402 at the lower part of the display may include a sensor retardation layer 410, a sensor polarization layer 422, a color filter layer 432, and a light sensor 442.

The sensor polarization layer 422 may be formed by alternately arranging the first sensor polarization layer 110 and the second sensor polarization layer 115 having different polarization axes. The first sensor polarization layer 110 and the second sensor polarization layer 115 may have a rectangular shape. Therefore, the sensor polarization layer 420 may have a structure in which each side of the first sensor polarization layer 110 is in contact with four second sensor polarization layers 115, or may have a structure in which each side of the second sensor polarization layer 115 is in contact with four The first sensor polarized light layer 110 is in contact. Here, the polarization axis of the first sensor polarization layer 110 may be inclined at a first angle relative to the slow axis of the sensor retardation layer 410, and the polarization axis of the second sensor polarization layer 115 may be relative to the slow axis of the sensor retardation layer 410. The shaft is inclined at a second angle.

The color filter layer 432 is disposed under the sensor polarizing layer 422, and the color filter layer 432 is composed of a plurality of repeated filter units. The light sensor 442 is disposed under the color filter layer 432. The light sensor 442 includes at least a pair of light receiving

units

311 and 312 that detect light belonging to the same wavelength band.

The first sensor polarized light layer 110 of the sensor polarized light layer 422 allows the first sensor linearly polarized light 23 and the second sensor linearly polarized light 31 to pass, so the light receiving part arranged at the lower part of the first sensor polarized light layer 110 is the first light receiving part部311. Conversely, the second sensor polarization layer 115 allows only the linearly polarized light 32 of the third sensor to pass through, and therefore the light receiving part arranged at the lower part of the second sensor polarization layer 115 is the second light receiving part 312. Thus, the planar arrangement structure of the first light receiving portion 311 and the second light receiving portion 312 can be substantially the same as the sensor polarizing layer 420.

FIG. 7 is an exploded perspective view for exemplarily illustrating still another embodiment of the color illuminance sensor at the lower part of the display. The description of the same parts as those in FIGS. 4 to 6 is omitted, and only the differences are described.

The color illuminance sensor 403 at the lower part of the display may include a sensor retardation layer 411, a sensor polarization layer 423, a color filter layer 432, and a light sensor 442.

The sensor delay layer 411 may be formed by alternately arranging a first sensor delay layer 120 having a first slow axis and a second sensor delay layer 125 having a second slow axis in the first direction. The first sensor delay layer 120 and the second sensor delay layer 125 may have a rectangular shape extending in the second direction. Here, the first slow axis and the second slow axis may be substantially orthogonal.

The sensor polarization layer 423 may be formed by alternately arranging the first sensor polarization layer 110 having the first polarization axis and the second sensor polarization layer 115 having the second polarization axis in the second direction. The first sensor polarizing layer 110 and the second sensor polarizing layer 115 may have a rectangular shape extending in the first direction. Here, the polarization axis of the first sensor polarization layer 110 may be inclined at a first angle with respect to the slow axis of the first sensor retardation layer 120, and the polarization axis of the second sensor polarization layer 115 may be retarded with respect to the first sensor. The slow axis of the layer 120 is inclined at a second angle.

The color filter layer 432 is disposed under the sensor polarizing layer 423, and the color filter layer 432 is composed of a plurality of repeated filter units. The light sensor 442 is disposed under the color filter layer 432. The light sensor 442 includes at least a pair of light receiving

units

311 and 312 that detect light belonging to the same wavelength band.

The first sensor retardation layer 120-the second sensor polarization layer 115 and the second sensor retardation layer 125-the first sensor polarization layer 110 are the first sensors that allow the first sensor linearly polarized light 23 and the second sensor linearly polarized light 31 to pass through. Light path. The first sensor retardation layer 120-the first sensor polarization layer 110 and the second sensor retardation layer 125-the second sensor polarization layer 115 are the second optical paths that only allow the third sensor linearly polarized light 32 to pass. Thus, the planar arrangement structure of the first light receiving portion 311 and the second light receiving portion 312 may have a structure in which each side of the first light receiving portion 311 is in contact with the four second light receiving portions 312, or each having the second light receiving portion 312 A structure in which the side is in contact with the four first light-receiving parts 311.

There are N types of color filter layers (where N≧1), and the total number of color filters included in the filter unit is 2n×N, which is the minimum value. As mentioned above, in the filter unit, the number of the same color filters is 2n (where n≥1). The filter unit can be repeated according to the first direction, the second line of defense, and their combined directions. As an example, Fig. 8 shows a filter unit with four color filters arranged in 4×4, and Fig. 9 shows four color filters with two arranged in 2×4 In order to facilitate understanding, the color filter at the position where light belonging to the same wavelength band with a relatively large amount of light is incident is marked with “B The color filter at the position where light belonging to the same wavelength band with a relatively small amount of light is incident is marked with the subscript "D".

FIG. 8(a) shows a filter unit in which the first color filter pair and the second color filter pair are arranged separately. The color filter pair is composed of two (or more) color filters of the same kind. The light with a relatively large amount of light passes through any one of the color filters (the color filter marked with "B" in the subscript) that constitutes the color filter pair to reach the first light receiving part, and the light with a relatively small amount of light passes through the remaining colors The filter (the color filter marked with "D" in the subscript) reaches the second light-receiving part. In each color filter pair, two color filters are arranged in contact with each other, and a color filter pair composed of different color filters is arranged around the color filter pair composed of one color filter. .

On the other hand, in the filter unit, the first color filter pair 500 and the second color filter pair 510 are not located in the same row. Taking the red filter as an example, the first red filter pair 500 is composed of two red filters in row r1, columns c1 and c2, and the second red filter pair 510 is composed of row r3 in column c3 and C4 consists of two red filters.

FIG. 8(b) shows a filter unit in which a first color filter pair and a second color filter pair composed of two color filters of the same kind are arranged separately. In each color filter pair, two color filters are arranged separately. In other words, more than one different color filter can be arranged between two same color filters. Therefore, different color filters are arranged around one color filter.

On the other hand, in the filter unit, the first color filter pair 520 and the second color filter pair 530 are not located in the same row. Taking the red filter as an example, the first red filter pair 520 is composed of two red filters in row r1, columns c1 and c3, and the second red filter pair 530 is composed of row r3 in column c2 and C4 consists of two red filters.

FIG. 9(a) shows a filter unit configured with four color filter pairs. Each color filter pair is composed of two color filters of the same kind. In each color filter pair, two color filters are arranged in contact. The light with a relatively large amount of light passes through one of the two color filters arranged in contact (the color filter marked with "B" in the subscript), and the light with a relatively small amount of light passes through the remaining color filters (the subscript Color filter marked "D"). The color filter pair composed of one type of color filter is surrounded by a color filter pair composed of different color filters. In the filter unit shown in FIG. 9(a), the red filter pair is arranged in the columns c1 and c2 of the row r1, the green filter pair is arranged in the columns c3 and c4 of the row r1, and the blue filter pair It is arranged in the columns c1 and c2 of the row r2, and the white filter pair is arranged in the columns c3 and c4 of the row r2.

Fig. 9(b) shows a filter unit in which four color filter pairs are arranged. Each color filter pair is composed of two color filters of the same kind. In each color filter pair, two color filters are arranged separately. In other words, more than one different color filter can be arranged between two same color filters. Therefore, different color filters are arranged around one color filter. In the filter unit shown in FIG. 9(b), the red filter pair is arranged in the columns c1 and c3 of the row r1, the green filter pair is arranged in the columns c2 and c4 of the row r1, and the blue filter is For the columns c1 and c3 arranged in the row r2, the white filter pair is arranged in the columns c2 and c4 of the row r2.

10 and 11 are diagrams exemplarily showing the detection area according to the arrangement of a plurality of the same color filters constituting the color filter pair, and FIG. 10 shows the application of the filter shown in (a) of FIG. 8 In the case of the color filter layer of the unit, FIG. 11 shows a case where the color filter layer having the filter unit shown in (b) of FIG. 8 is applied. Reference numeral 300R _B light is emphasized relatively large amount of light belonging to a red wavelength band light sensor receiving a first portion of the detected R _B, reference numerals 300R _D emphasis light belonging to a relatively large amount of light in the red band were a light sensor light receiving portion R _B of the second detection.

Reference numerals

10a, 10b, and 10c are sensor detection areas defined in the lower part of the display 10, in other words, are areas where the light sensor can sense light emitted from the display 10. On the sensor detection area 10a marked with a plurality of sub-regions of the first light-receiving portion R _B is capable of detecting light 10rb, and marked by a plurality of sub regions R _D 10rd light unit can be detected by the second light detection area on the sensor 10b. The sensor detection area 10c is marked with a plurality of sub-areas 10rb and a plurality of sub-areas 10rd.

Compared with the measurement method that does not distinguish the wavelength bands of light, the measurement method that distinguishes the wavelength bands of light can measure the surrounding brightness, that is, the illuminance relatively more accurately. In particular, if the light belonging to the same wavelength band passes through the light selection layer and is separated into light with a relatively large amount of light and light with a relatively small amount of light, the surrounding brightness of the electronic device can be accurately measured even in the lower part of the display. In addition, the color temperature can be calculated based on the brightness of light in different wavelength bands. The calculated color temperature is provided to the display or camera of the electronic device, so that it can be used to correct the image displayed on the display or the image captured by the camera.

Referring to FIG. 10, the color filter pair is composed of two color filters of the same type, and the two color filters of the same type are arranged in contact with each other. If the two kinds of color filters with the filter unit arranged in contact with the optical sensor is applied, the light receiving portion and the second light-R _B R _D each detected portion of the first by at least a portion of light emitted from the sub-region can overlap. Between two kinds of color filters with the closer, it is issued by a first overlapping area Overlap area on the lower surface of the light display portion R _B light and the second light-receiving portion R _D of the more common detection increases. Further, if the first light-receiving portion R _B and a second light-receiving portion R _D viewing angle is increased, or the first light receiving unit and the second light R _B R _D portion increases the distance between the lower surface of the display area of the region is overlapped Overlap Will increase. The first light portion and a second relatively large R _B light and the light amount of light portion R _D is relatively small amount of light-receiving optical detection, luminance measurement can be performed in a plurality of positions around the sensor detection area 10c, the relative amount of light Larger light and relatively small light are generated by the light emitted from the overlap area.

On the other hand, referring to FIG. 11, the color filter pair is composed of two color filters of the same type, and the two color filters of the same type are arranged separately. If the same filter unit two kinds of color filters arranged separately applied to the optical sensor, the first receiving area of the light emitting portion of the overlap region R _B and the first light receiving portion R _D compared to common detection shown in FIG. 10 Can be relatively reduced. Conversely, the first light receiving portion and the R _B may be relatively increased compared to the first light receiving portion shown in FIG R _D light can be detected by an area sensor for detecting region 10c of FIG. 10. As shown, a plurality of light sensor 300 included in the first light receiving portion and a light R _B R _D the first light receiving portion can be emitted from the sensing region 10c of the sensor for detecting substantially the entire area of 11. In other words, the plurality of first light receiving unit and the second light R _B R _D portion can be relatively large amount of light is relatively small amount of light light light is detected, a relatively large amount of light is relatively small amount of light light The light is generated by light emitted from substantially the entire area of the sensor detection area 10c. As a result, the surrounding brightness can be measured over the entire sensor detection area 10c. For example, the amount of light of the first plurality of light-receiving portion R _B generates a relatively large measurement of the amount of the entire light emitted from the optical computing a relatively large area sensor detects the average luminance of the light, Similarly, the plurality of second light receiving unit R _D generation amount of light is relatively small and the measurement values for calculating the entire amount of light emitted from the detection region of the sensor is relatively small average luminance of the light. In addition, the calculation of the average value for the sensor detection area can of course also be used in the case shown in FIG. 10.

Using the average brightness of the area can reduce the pixel impact of the display to a considerable extent. For example, the pixels of the display are turned on or off according to the displayed image, and the intensity of the emitted light is also different. Therefore, when the light receiving unit of the photosensor detects light emitted from a specific pixel or several or even dozens of pixels, the surrounding brightness calculated from the measured value may be severely distorted (deviation from the actual value). Even if the average brightness of the entire sensor detection area is used, the light generated by a specific pixel affects some of the light-receiving parts, which may cause partial distortion of the measured value. However, even if some of the measured values are distorted, the effect on the average brightness is minimal.

FIG. 12 is a diagram for exemplarily explaining still another embodiment of the color illuminance sensor in the lower part of the display. The description overlapping with FIG. 1 will be omitted, and the difference will be mainly described.

The color illuminance sensor 404 at the lower part of the display is arranged at the lower part of the display 10. The color illumination sensor 404 at the lower part of the display includes: a light selection layer 202 with two light paths; a color filter layer 330, which is arranged under the light selection layer 202; and a light sensor 300, which is arranged under the color filter layer 330, and Detect the light after passing through each optical path. The light incident on the color illuminance sensor 404 at the lower part of the display is the display circularly polarized light 22 generated from the external light 20 and the non-polarized light 30 generated inside the display.

The first optical path and the second optical path in the light selection layer 202 have different effects on the circularly polarized light 22 and the non-polarized light 30 of the display. The first optical path allows the circularly polarized light 22 and the unpolarized light 30 of the display to pass directly. The circularly polarized light 22 and the unpolarized light 30 of the display after passing through the first optical path reach the first light receiving portion 311. On the contrary, the second optical path allows the non-polarized light 30 to pass and substantially blocks the circularly polarized light 22 of the display. The unpolarized light 30 that has passed through the second optical path becomes the third sensor linearly polarized light 32 and reaches the second light receiving unit 312.

The circularly polarized light 22 and the unpolarized light 30 of the display can be detected by the first light receiving unit 311, and the linearly polarized light 32 of the third sensor can be detected by the second light receiving unit 312. The linearly polarized light generated from the circularly polarized light 22 of the display through the light selection layer 202 cannot be incident on the second light receiving section 312, so the second light receiving section 312 can only measure the third sensor linearly polarized light 32 generated from the non-polarized light 30. brightness. A first proportional relationship is established between the brightness of the circularly polarized light 22 of the display and the brightness of the external light 22, and a second proportional relationship is established between the unpolarized light 30 and the linearly polarized light 32 of the third sensor. Among them, the first proportional relationship and the second proportional relationship can be linear or non-linear. The first proportional relationship can be determined based on the measurement results when all pixels of the display 10 are turned off, and the second proportional relationship can be determined based on The result of the measurement in a state where the pixels of the display 10 are turned off in a state where there is no external light 22 is confirmed. After correcting the brightness detected by the first light receiving unit 311 through the second proportional relationship, if the first proportional relationship is applied to the corrected brightness, the brightness of the external light 20 can be determined.

As described above, the color illuminance sensor 600 at the lower part of the display can be manufactured by laminating the sensor retardation layer 610, the sensor polarization layer 620, the color filter layer 630, and the light sensor 640. Here, at least the sensor retardation layer 610 and the sensor polarizing layer 620 may be film-shaped.

The sensor retardation layer 610 may be formed by alternately arranging the first sensor retardation layer 120 having the first slow axis and the first light transmission layer 127 that transmits incident light in the first direction. The first sensor retardation layer 120 and the first light transmission layer 127 may have a rectangular shape extending along the second direction. Here, the first slow axis may be inclined at a second angle with respect to the second polarization axis of the sensor polarization layer 620.

The sensor polarization layer 620 is disposed at the lower part of the sensor delay layer 610. The sensor polarization layer 620 may be formed by alternately arranging the second sensor polarization layer 115 having the second polarization axis and the second light transmission layer 117 that transmits incident light in the first direction. The second sensor polarization layer 115 and the second light transmission layer 117 may have a rectangular shape extending along the second direction. The first light transmission layer 127 and the second light transmission layer 117 may be formed of substances having the same or similar light transmittance.

The color filter layer 630 is disposed under the sensor polarizing layer 620, and the color filter layer 630 is composed of a plurality of repeated filter units. The light sensor 640 is disposed under the color filter layer 430. The light sensor 440 includes at least a pair of light receiving

units

311 and 312 that detect light belonging to the same wavelength band.

It should be understood that, in order to exemplify the above description of the present invention, those skilled in the art can easily change to other specific modes without changing the technical idea and essential features of the present invention. Therefore, it should be understood that the above-described embodiments are exemplary in all aspects and are not intended to be limiting. In particular, the features of the present invention described with reference to the drawings are not limited to the structures shown in the specific drawings, and can be implemented alone or in combination with other features.

It should be understood that the scope of the present invention is presented by the appended claims rather than the above description. It should be understood that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts The manners are all included in the scope of the present invention.

Claims

A color illuminance sensor at the lower part of a display is arranged at the lower part of the display and measures the brightness around the display. The display includes a pixel that generates light, a display retardation layer arranged on the upper part of the pixel, and a display polarized light Layer, where,

The color illuminance sensor at the lower part of the display includes:

The light selection layer has a first optical path and a second optical path, and the first optical path and the second optical path are display circularly polarized light generated by external light incident from the outside of the display and generated by the pixel The optical path that unpolarized light travels;

The color filter layer is arranged at the lower part of the light selection layer, so that the light passing through the first light path and the second light path can pass through different wavelength bands; and

The photosensor is disposed under the color filter layer and has a first light receiving portion and a second light receiving portion. The first light receiving portion detects light passing through the first optical path, and the second light receiving portion Detecting the light passing through the second optical path,

The first optical path allows the circularly polarized light and the non-polarized light of the display to pass through,

The second optical path blocks the circularly polarized light of the display and allows the non-polarized light to pass through,

The first light receiving unit and the second light receiving unit detect light in the same wavelength band.
The color illuminance sensor in the lower part of the display according to claim 1, wherein:

The light selection layer includes:

A sensor retardation layer for the circularly polarized light to enter the display, and has an orthogonal slow axis and a fast axis;

The first sensor polarized light layer is located at the lower part of the sensor retardation layer and has a polarized light axis inclined at a first angle with respect to the slow axis; and

The second sensor polarization layer is located at the lower part of the sensor delay layer and has a polarization axis inclined at a second angle with respect to the slow axis,

The sensor retardation layer and the first sensor polarization layer form the first optical path,

The sensor retardation layer and the second sensor polarization layer form the second optical path.
The color illuminance sensor in the lower part of the display according to claim 2, wherein:

The plurality of first sensor polarization layers and the plurality of second sensor polarization layers are alternately arranged on the same plane.
The color illuminance sensor in the lower part of the display according to claim 1, wherein:

The light selection layer includes:

The first sensor retardation layer, for the circularly polarized light to enter the display, and has a first slow axis and a first fast axis that are orthogonal;

A second sensor retardation layer for the circularly polarized light to enter the display and has a second slow axis and a second fast axis that are orthogonal; and

The sensor polarization layer is located under the first sensor retardation layer and the second sensor retardation layer, and has a polarization axis inclined at a first angle with respect to the first slow axis,

The first slow axis and the second slow axis are orthogonal,

The first sensor retardation layer and the sensor polarization layer form the first optical path,

The second sensor retardation layer and the sensor polarization layer form the second optical path.
The color illuminance sensor in the lower part of the display according to claim 4, wherein:

The plurality of first sensor delay layers and the plurality of second sensor delay layers are alternately arranged on the same plane.
The color illuminance sensor in the lower part of the display according to claim 1, wherein:

The light selection layer includes:

The first sensor retardation layer, for the circularly polarized light to enter the display, and has a first slow axis and a first fast axis that are orthogonal;

The second sensor retardation layer, for the circularly polarized light to enter the display, and has a second slow axis and a second fast axis that are orthogonal;

The first sensor polarization layer is located under the first sensor retardation layer and the second sensor retardation layer, and has a polarization axis inclined at a second angle with respect to the first slow axis; and

The second sensor polarization layer is located below the first sensor retardation layer and the second sensor retardation layer, and has a polarization axis inclined at a first angle with respect to the first slow axis,

The first slow axis and the second slow axis are orthogonal.
The color illuminance sensor in the lower part of the display according to claim 6, wherein:

A plurality of the first sensor delay layers and a plurality of the second sensor delay layers are alternately arranged on a first plane,

The plurality of first sensor polarization layers and the plurality of second sensor polarization layers are alternately arranged on the second plane.
The color illuminance sensor in the lower part of the display according to claim 2, 4 or 6, wherein:

The first light receiving unit detects the linearly polarized light of the first sensor generated from the circularly polarized light of the display and the linearly polarized light of the second sensor generated from the non-polarized light, and

The second light receiving unit detects linearly polarized light of the third sensor generated from the unpolarized light.
The color illuminance sensor in the lower part of the display according to claim 1, wherein:

The light selection layer includes:

A sensor retardation layer for the circularly polarized light to enter the display, and has an orthogonal slow axis and a fast axis;

The sensor polarization layer is located at the lower part of the sensor delay layer and has a polarization axis inclined at a second angle with respect to the slow axis,

The sensor retardation layer and the sensor polarization layer are provided only on the upper part of the second light receiving part.
The color illuminance sensor in the lower part of the display according to claim 1, wherein:

The color filter layer is composed of a plurality of repeated filter units, the filter unit is composed of 2n×N color filters, and the filter unit includes 2n color filters of the same kind, wherein N And n is a natural number greater than or equal to 1, and N is the type of color filter.
The color illuminance sensor in the lower part of the display according to claim 10, wherein:

In the filter unit, the first light-receiving part is arranged at the lower part of n of the 2n same-color filters, and the second light-receiving part is respectively arranged on the remaining n The lower part of the same kind of filter.
The color illuminance sensor in the lower part of the display according to claim 11, wherein:

In the filter unit, two color filters of the same kind are arranged in contact with each other.
The color illuminance sensor in the lower part of the display according to claim 11, wherein:

In the filter unit, two color filters of the same kind are arranged apart from each other.
The color illuminance sensor in the lower part of the display according to any one of claims 10 to 13, wherein:

The light sensor measures the brightness of light of N different wavelength bands through N color filters.
The color illuminance sensor in the lower part of the display according to claim 14, wherein:

The plurality of first light receiving parts and the plurality of second light receiving parts respectively measure the brightness of light emitted from a sensor detection area defined by the lower surface of the display, and

The multiple measured values are used to calculate the average brightness of the light emitted from the sensor detection area.