CN216978134U - Ambient light sensor and electronic device - Google Patents

Abstract

The application provides an ambient light sensor and electronic equipment can improve the detection precision and the detection performance of ambient light sensor under the display screen, and then promote the user and experience the use of ambient light sensor place electronic equipment. An ambient light sensor configurable to be disposed below a display screen of an electronic device includes: the filter unit array comprises a plurality of filter units, the plurality of filter units comprise blue filter units and transparent filter units, the ratio of the number of the blue filter units to the number of the plurality of filter units is greater than or equal to 24%, and the ratio of the number of the transparent filter units to the number of the plurality of filter units is less than or equal to 9%; and the pixel unit array is positioned below the filtering unit array and comprises a plurality of pixel units, and the plurality of pixel units are used for receiving optical signals of ambient light passing through the display screen and the plurality of filtering units so as to detect the ambient light.

Description

Ambient light sensor and electronic device

Technical Field

The present application relates to the field of sensors, and more particularly, to an ambient light sensor and an electronic device.

Background

With the development of electronic devices (e.g., intelligent terminal devices: mobile phones, tablet computers, etc.), an ambient light sensor gradually becomes a standard sensor, and the ambient light sensor is used to detect the intensity of ambient light in the environment where the intelligent terminal device is located, and the detected intensity of the ambient light can have multiple purposes, for example, the screen brightness of the terminal device can be automatically adjusted along with the intensity of the ambient light, so that the use experience of a user on the terminal device is improved.

In order to reduce the space occupied by the ambient light sensor in the electronic device, the ambient light sensor can be arranged below the display screen of the electronic device, but in the arrangement mode, the display screen can have certain influence on the detection precision of the ambient light sensor, and the detection precision and the performance of the ambient light sensor are influenced.

In view of this, how to improve the detection accuracy and the detection performance of the ambient light sensor under the display screen to improve the user experience of the electronic device where the ambient light sensor is located is a technical problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The application provides an ambient light sensor and electronic equipment can improve the detection precision and the detection performance of ambient light sensor under the display screen, and then promote the user and experience the use of ambient light sensor place electronic equipment.

In a first aspect, an ambient light sensor is provided, which can be configured to be disposed below a display screen of an electronic device, and which comprises: the filter unit array comprises a plurality of filter units, the plurality of filter units comprise blue filter units and transparent filter units, the ratio of the number of the blue filter units to the number of the plurality of filter units is greater than or equal to 24%, and the ratio of the number of the transparent filter units to the number of the plurality of filter units is less than or equal to 9%; and the pixel unit array is positioned below the filtering unit array and comprises a plurality of pixel units, and the plurality of pixel units are used for receiving optical signals of the ambient light after passing through the display screen and the plurality of filtering units so as to detect the ambient light.

Through the technical scheme of this application embodiment, set up blue filter unit and transparent filter unit simultaneously in the filter unit array, can guarantee that ambient light sensor can gather the colorama signal and also can gather the white light signal, meanwhile, blue filter unit accounts for than being greater than transparent filter unit accounts for than in ambient light sensor, can guarantee that the quantity of blue filter unit is more in the ambient light sensor, thereby reduce the influence that the display screen detected blue light signal in to ambient light, promote ambient light sensor's detection precision and detection performance.

In some possible embodiments, the plurality of filter units further includes a red filter unit, the number of red filter units is less than or equal to the number of blue filter units, and a ratio of the number of red filter units to the number of the plurality of filter units is greater than or equal to 15%.

In some possible embodiments, the ratio of the pixel values of the pixel units corresponding to the blue filter unit and the red filter unit is used for detecting the color temperature of the ambient light.

In some possible embodiments, the plurality of filtering units further includes a green filtering unit, and a ratio of the number of green filtering units to the number of the plurality of filtering units is greater than or equal to 24%.

In some possible embodiments, the pixel value of the pixel unit corresponding to the green filter unit is used to detect the illuminance of the ambient light.

In some possible embodiments, the plurality of filtering units further include a white filtering unit, the white filtering unit is configured to pass a visible light signal and block an infrared light signal, the transparent filtering unit is configured to pass the visible light signal and the infrared light signal, and a pixel unit corresponding to the white filtering unit and a pixel unit corresponding to the transparent filtering unit are configured to jointly detect a signal amount of the infrared light signal in the ambient light.

In some possible embodiments, a ratio of the number of white filter elements to the number of the plurality of filter elements is less than or equal to 20%.

In some possible embodiments, a ratio of the number of white filter cells to the number of the plurality of filter cells is greater than or equal to 5%, and/or a ratio of the number of transparent filter cells to the number of the plurality of filter cells is greater than or equal to 4%.

In some possible embodiments, the white filter unit and/or the transparent filter unit are located at edge regions of the plurality of filter units.

In some possible embodiments, the plurality of filtering units are arranged in N rows, a row arrangement direction of the N rows of filtering units is parallel to a row scanning direction of the display screen, and each row of filtering units of the N rows of filtering units includes: the color filter comprises a red filter unit, a green filter unit and a blue filter unit, wherein N is a positive integer.

In some possible embodiments, each row of the N rows of filter cells further includes a white filter cell.

In some possible embodiments, the array of filter units further includes: a light blocking unit for blocking and absorbing a light signal; the pixel units in the pixel unit array corresponding to the light blocking units are used for detecting the background noise of the ambient light sensor.

In some possible embodiments, the plurality of filtering units are arranged in N rows, a row arrangement direction of the N rows of filtering units is parallel to a row scanning direction of the display screen, and one light blocking unit is disposed at an end of each row of the N rows of filtering units, where N is a positive integer.

In some possible embodiments, a gap is formed between two adjacent filter units in the filter unit array, and the width of the gap is greater than 20 μm.

In some possible embodiments, each filter unit in the filter unit array corresponds to P × P pixel units in the pixel unit array, where P is a positive integer greater than or equal to 5.

In a second aspect, an electronic device is provided, comprising: a display screen and an ambient light sensor as in the first aspect or any possible implementation manner of the first aspect, wherein the ambient light sensor is disposed below the display screen, and sensing data detected by the ambient light sensor is used to adjust an optical parameter of the display screen.

Through the technical scheme of this application embodiment, set up the ambient light sensor in electronic equipment, because this ambient light sensor has higher detection precision and detection performance, adjust the optical parameter of display screen according to this ambient light sensor's sensing data, can be so that the regulation of display screen more accurate in order to adapt to current ambient light to can promote the user and experience to electronic equipment's use.

Drawings

Fig. 1 is a schematic diagram of an electronic device to which the present application may be applied.

Fig. 2 is a graph illustrating transmittance of a display panel according to an embodiment of the present disclosure for light signals in different wavelength bands of ambient light.

Fig. 3 is a schematic top view of an ambient light sensor according to an embodiment of the present application.

Fig. 4 is a schematic cross-sectional view of the ambient light sensor shown in fig. 3 taken along the direction a-a'.

Fig. 5 is a schematic diagram of a filter unit array according to an embodiment of the present application.

FIG. 6 is a spectrum diagram of a plurality of light sources with different color temperatures according to an embodiment of the present application.

Fig. 7 is a schematic diagram of a filter unit array according to an embodiment of the present application.

Fig. 8 is a schematic diagram of another filter cell array according to an embodiment of the present disclosure.

Fig. 9 is a schematic diagram of another filter cell array according to an embodiment of the present disclosure.

Fig. 10 is a schematic diagram of another filter cell array according to an embodiment of the disclosure.

Fig. 11 is a schematic diagram of another filter cell array according to an embodiment of the disclosure.

Fig. 12 is a schematic diagram of another filter cell array according to an embodiment of the present disclosure.

Detailed Description

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

The technical solution related to the Ambient Light Sensor (ALS) provided in the embodiment of the present application may be applied to various electronic devices, and is particularly suitable for 3C electronic products related to three types, i.e., a Computer (Computer) and its peripheral devices, communication (Communications) and Consumer Electronics (Consumer Electronics), such as a smart phone, a notebook Computer, a tablet Computer, an intelligent wearable device, a home appliance device, a game device, and the like. In addition, the technical solutions related to the embodiments of the present application also relate to other types of electronic devices such as automotive electronics, and the embodiments of the present application are not particularly limited to this.

As an application scenario, the ambient light sensor provided by the embodiment of the application can be applied to smart phones, tablet computers and other mobile terminals or other terminal devices with display screens. For example, in some embodiments, the ambient light sensor may be disposed between the middle frame and the display screen of the electronic device and below a Cover Glass (CG) of the electronic device, so as to achieve ambient light detection of an environment in which the electronic device is located. Alternatively, in other embodiments, the ambient light sensor may be disposed in a local area below a display screen of the electronic device, thereby forming an Under-screen (Under-display) ambient light detection device.

Fig. 1 shows a schematic view of an electronic device 10 to which the present application may be applied.

As shown in fig. 1, in the electronic device 10, the ambient light sensor 100 is disposed below the display area of the display screen 110, and is configured to detect the ambient light L0 after passing through the display screen 110. The Display screen 110 may be a self-luminous Display screen, such as an Organic Light Emitting Diode (OLED) Display screen, or a passive light emitting Display screen, such as a Liquid Crystal Display (LCD), and the like, which is not limited in this application.

Optionally, a cover plate 140 is disposed on the upper surface of the display screen 110, and the cover plate 140 may be made of a transparent hard material such as glass or resin, and is used for protecting the display screen 110.

The lower surface of the display screen 110 is provided with a protective layer 111, the protective layer 111 is generally a rear panel of the display screen, and may be a black sheet layer or a printed layer for shielding light, including at least a portion of a metal material for dissipating heat, and may further include a foam layer for buffering and protecting.

As shown in fig. 1, a window is formed in the protection layer 111, the ambient light sensor 100 is disposed below the window, and the ambient light L0 is transmitted to the ambient light sensor 100 through the cover 140, the display screen 110 and the window in the protection layer 111, so that the ambient light sensor 100 performs ambient light detection based on the received ambient light L0.

Specifically, the display panel 110 includes various stacked layers such as a semiconductor circuit, an organic material, a polarizing plate, a Polyimide (PI) film, and an Optically Clear Adhesive (OCA) layer in addition to the protective layer 111, and thus transmittance of light signals of different wavelength bands in ambient light passing through the display panel 110 is different.

Fig. 2 shows a schematic graph of the transmittance of the display screen 110 for different wavelength bands of light signals in the ambient light.

As shown in FIG. 2, the display panel 110 has a low transmittance for blue light signals between 450nm and 500nm and a high transmittance for red light signals.

In some related embodiments, a plurality of Color Filters (CF) 101 of different colors are disposed in the ambient light sensor 100. The ratio of the color filter 101 of each color in the ambient light sensor 100 is the same, and when the ambient light passes through the display screen 110, the signal amount of the blue light signal is low, so the ambient light sensor 100 has a poor detection effect on the blue light signal, thereby affecting the detection accuracy and the detection performance of the ambient light sensor 100 on the ambient light.

In view of this, the present application provides an ambient light sensor, which improves the ratio of the blue filter therein, so as to improve the detection effect of the ambient light sensor on the blue light signal, and improve the detection accuracy and the detection performance of the ambient light sensor.

Fig. 3 shows a schematic top view of an ambient light sensor 200 provided in an embodiment of the present application, and fig. 4 is a schematic cross-sectional view of the ambient light sensor 200 along a direction a-a'. In the embodiment of the present application, the ambient light sensor 200 can be configured to be disposed below the display screen 110 of the electronic device 10. Alternatively, the ambient light sensor 200 can be configured to be disposed below the display area of the display screen 110 of the electronic device 10.

As shown in fig. 3 and 4, in the embodiment of the present application, the ambient light sensor 200 includes:

a filter array 210 including a plurality of filter units including a blue filter unit 2013 and a transparent filter unit 203, a ratio of the number of the blue filter unit 2013 to the number of the plurality of filter units being greater than or equal to 24%, and a ratio of the number of the transparent filter unit 203 to the number of the plurality of filter units being less than or equal to 9%;

and a pixel unit array 220 located below the filter unit array 210, wherein the pixel unit array 220 includes a plurality of pixel units for receiving optical signals of the ambient light passing through the display screen and the plurality of filter units to perform ambient light detection.

Specifically, in the embodiment of the present application, the ambient light sensor 200 includes: a pixel cell array 220 for sensing a light signal, the pixel cell array 220 including a plurality of pixel cells for sensing a light signal therein. The pixel unit includes, but is not limited to, a Photo Diode (PD), a photo transistor, and other photo sensing devices.

Corresponding to the pixel unit array 220, a filter unit array 210 is disposed above it. Alternatively, in some embodiments, the filter unit array 210 may be prepared on the upper surface of the pixel unit array 220 through a semiconductor manufacturing process, so that the filter unit array 210 is disposed above the pixel unit array 220.

For the filter unit array 210, it includes a plurality of filter units, each of which can be used to pass the optical signal of the target wavelength band to achieve the filtering function. Specifically, the filtering unit may be an optical filter or a filter layer in the embodiment of the present application, and the preparation method thereof may be referred to in the related description in the related art, and the structure and the preparation manner of the filtering unit are not specifically limited in the embodiment of the present application.

In the embodiment of the present application, the plurality of filter units in the filter unit array 210 includes: a blue filter 2013 and a transparent filter 203. Specifically, the blue filter unit 2013 is used for passing blue light signals in a blue wavelength band in visible light, and the transparent filter unit is used for passing white light signals in all visible wavelength bands. As an alternative embodiment, an air layer may be above the transparent filtering unit 203, or a transparent medium layer may also be above the transparent filtering unit, which is intended to pass white light signals of all visible light bands.

Specifically, among the plurality of filter units in the filter unit array 210, the ratio of the number of blue filter units 2013 to the number of the plurality of filter units is greater than or equal to 24%, and the ratio of the number of transparent filter units 203 to the number of the plurality of filter units is less than or equal to 9%. That is, in the present embodiment, the blue filter unit 2013 and the transparent filter unit 203 have different ratios among the plurality of filter units. The number of blue filter units 2013 is larger and the number of transparent filter units 203 is smaller.

Through the technical scheme of the embodiment of the application, the blue filtering unit 2013 and the transparent filtering unit 203 are simultaneously arranged in the filtering unit array 210, it can be ensured that the ambient light sensor 200 can collect both colored light signals and white light signals, meanwhile, the proportion of the blue filtering unit 2013 in the ambient light sensor 200 is greater than that of the transparent filtering unit 203 in the ambient light sensor 200, it can be ensured that the number of the blue filtering units 2013 in the ambient light sensor 200 is greater, thereby reducing the influence of the display screen 110 on the detection of the blue light signals in the ambient light, and improving the detection accuracy and the detection performance of the ambient light sensor 200.

Fig. 5 shows a schematic diagram of a filter unit array 210 according to an embodiment of the present disclosure.

As shown in fig. 5, in the embodiment of the present application, the plurality of filter units of the filter unit array 210 further includes: the red filter unit 2011 is configured to pass red signals in a red wavelength band of visible light.

Referring back to fig. 2, as shown in fig. 2, the transmittance of the display screen 110 for red light signals is relatively high, and therefore, in the embodiment of the present application, the number of the red filter units 2011 may be less than or equal to the number of the blue filter units 2013, so as to preferentially ensure the occupation ratio of the blue filter units 2013 in multiple filter units. In addition, by way of example and not limitation, the ratio of the number of the red filter units 2011 to the number of the plurality of filter units is greater than or equal to 15% to ensure the detection effect of the ambient light sensor 200 on the red light signal in the ambient light.

According to the technical solution of the embodiment of the application, the filter unit array 210 may further include a red filter unit 2011 in addition to the blue filter unit 2013, and on the basis of ensuring the detection effect of the ambient light sensor 200 on the blue light signal and the red light signal, the pixel values of the pixel units corresponding to the blue filter unit 2013 and the red filter unit 2011 may be used to detect the color temperature of the ambient light.

FIG. 6 shows a spectrum diagram of a plurality of light sources with different color temperatures provided by an embodiment of the present application.

As shown in fig. 6, for light sources with different color temperatures, the color temperature thereof has a positive correlation with the ratio of the signal amount of the blue light signal to the signal amount of the red light signal in the light signal, i.e., the larger the ratio of the signal amount of the blue light signal to the signal amount of the red light signal in the light source light signal, the higher the color temperature of the light source light signal.

Therefore, the pixel unit corresponding to the blue filter unit 2013 can be used to detect the signal amount of the blue light signal in the ambient light, the pixel unit corresponding to the red filter unit 2011 can be used to detect the signal amount of the red light signal in the ambient light, and the color temperature of the current ambient light can be detected according to the ratio of the pixel values of the pixel units corresponding to the blue filter unit and the red filter unit.

In the embodiment of the present application, the pixel unit corresponding to the filtering unit refers to a pixel unit capable of receiving the optical signal that has passed through the filtering unit. For convenience of description, in the present application, the pixel units that receive the optical signals that have passed through the same filter unit are simply referred to as the pixel units corresponding to the filter unit.

Fig. 7 shows a schematic diagram of a filter unit array 210 according to an embodiment of the present disclosure.

As shown in fig. 7, in the embodiment of the present application, the plurality of filter units of the filter unit array 210 further includes: the green filter unit 2012 passes a green signal in a green wavelength band of visible light.

By way of example and not limitation, the ratio of the number of the green filter units 2012 to the number of the plurality of filter units is greater than or equal to 24% to ensure the detection effect of the ambient light sensor 200 on the green light signal in the ambient light.

In addition, the pixel value of the pixel unit corresponding to the green filter unit 2012 can be used to detect the illuminance of the ambient light.

Specifically, three light sensing cells of human eyes are stimulated by light signals of three primary colors (Red Green Blue, RGB) in the ambient light, and three stimulus values of XYZ can be obtained, wherein the stimulus value Y can be used to represent the illuminance of the ambient light. By way of example and not limitation, the transformation relationship between RGB semaphore and XYZ stimulus value is shown as follows:

as can be seen from the above formula, the ambient light illuminance (stimulus value Y) mainly depends on the signal amount of the green light signal in the ambient light, and therefore, the pixel unit corresponding to the green light filtering unit 2012 in the ambient light sensor 200 can be used to detect the signal amount of the green light signal in the ambient light to detect the illuminance of the ambient light.

Fig. 8 shows a schematic diagram of a filter unit array 210 according to an embodiment of the present disclosure.

As shown in fig. 8, in the embodiment of the present application, the plurality of filter units of the filter unit array 210 further includes: a white filter unit 202. Specifically, the white filter unit 202 may be another filter unit different from the transparent filter unit 203 described above. The white filter unit 202 can pass light signals of all visible light bands, that is, the white filter unit 202 can pass white light signals. Meanwhile, the white filter unit 202 can absorb and/or reflect the optical signal in the infrared band to block the optical signal in the infrared band from passing through the white filter unit 202. Optionally, in some embodiments, an infrared cut filter (IRCF) layer is disposed in the white filter unit 202 to block the infrared light signal. Unlike the white filter unit 202, the transparent filter unit 203 can pass not only white light signals of the entire visible light band but also infrared light signals of the infrared band.

Therefore, after the ambient light passes through the filter array 210, the pixel cell corresponding to the white filter 202 is used to detect the visible light signal in the ambient light, and the pixel cell corresponding to the transparent filter 203 is used to detect the visible light signal and the infrared light signal in the ambient light, and the signal amount of the infrared light signal in the ambient light can be determined according to the pixel values of the pixel cells corresponding to the white filter 202 and the transparent filter 203.

According to the technical scheme of the embodiment of the application, the white filtering unit 202 and the transparent filtering unit 203 are simultaneously arranged in the ambient light sensor 200, the signal quantity of the infrared light signal in the ambient light can be detected according to the pixel units corresponding to the white filtering unit 202 and the transparent filtering unit 203, the detection result of the ambient light sensor 200 can be corrected or optimized according to the signal quantity of the infrared light signal, and the detection accuracy and the detection performance of the ambient light sensor 200 are improved.

In order not to affect the ratio of the color filter such as the blue filter 2013 in the filter array 210, the ratio of the number of the white filter 202 to the number of the plurality of filters in the filter array 210 is less than or equal to 20%.

Optionally, the ratio of the number of the white filter units 202 to the number of the plurality of filter units may be greater than or equal to 5%, and/or the ratio of the number of the transparent filter units 203 to the number of the plurality of filter units is greater than or equal to 4%, so that the number of the white filter units 202 and the transparent filter units 203 in the filter unit array 210 is at a suitable level, which can ensure the collection effect of the white light signals and the infrared light signals, and does not affect the ratio of the color filter units in the filter unit array 210.

In addition to designing the number of the white filter units 202 and the transparent filter units 203 to be smaller to ensure the detection performance of the ambient light sensor 200 for the color light signals, optionally, in a plurality of filter units of the filter unit array 210, the white filter units 202 and/or the transparent filter units 203 may be further disposed in an edge region of the filter unit array 210, so as to ensure the collection effect of the pixel units corresponding to the color filter units 201 on the color light signals, and further improve the detection accuracy and the detection performance of the ambient light sensor 200.

Fig. 9 to fig. 11 are schematic diagrams illustrating another filter unit array 210 provided in an embodiment of the present application.

Specifically, the plurality of filter unit arrays in the filter unit array 210 are arranged in N rows and M columns, where N and M are positive integers. As an example, in the embodiment shown in fig. 9 to 11, N-M-5.

As shown in fig. 9, in the filter array 210, the number of red filter units 2011 is 5, the number of green filter units 2012 is 5, and the number of blue filter units 2013 is 8. The ratio of the number of the blue filter 2013 to the total number of the filter units is 32%. In this embodiment, the ratio of the blue filter elements 2013 is the largest, so the ambient light sensor 200 with the filter element array 210 is better suited for use under a display screen. And in this embodiment, the accuracy of the color temperature detection of the ambient light by the ambient light sensor 200 is high.

As shown in fig. 10, in the filter array 210, the number of red filter units 2011 is 5, the number of green filter units 2012 is 8, and the number of blue filter units 2013 is 5. The ratio of the number of the green filter units 2012 to the total number of the filter units is 32%. In this embodiment, the duty ratio of the green filter unit 2012 is the largest, and the illuminance detection accuracy of the ambient light by the ambient light sensor 200 is higher.

As shown in fig. 11, in the filter array 210, the number of the red filter units 2011, the number of the green filter units 2012, and the number of the blue filter units 2013 are all 6. The ratio of the number of the red filter 2011 to the number of the total filter, the ratio of the number of the green filter 2012 to the number of the total filter, and the ratio of the number of the blue filter 2013 to the number of the total filter are all 24%. In this embodiment, the ambient light sensor 200 has high accuracy in detecting both the color temperature and illuminance of ambient light.

Optionally, in the embodiments shown in fig. 9 to 11, the number of the white filter units 202 is 5, which are respectively distributed at the edge and the center of the filter unit array 210. The number of the transparent filter units 203 is 2, which are respectively distributed at two corners of the filter unit array 210.

Alternatively, in the embodiments shown in fig. 9 to 11, among the plurality of filter units in the filter unit array 210, the number of the transparent filter units 203 is the smallest, the number of the white filter units 202 is less than or equal to the number of the color filter units of any one color, and among the color filter units, the number of the green filter units 2012 or the blue filter units 2013 may be greater than or equal to the number of the red filter units 2011.

It is understood that fig. 9 to 11 are only examples, and illustrate schematic diagrams of several filter unit arrays 210 provided in the embodiments of the present application. The present application may also provide more types of filter unit arrays 210 when one or more predetermined ratios are satisfied, and will not be specifically illustrated and discussed herein. Specifically, the filter unit array 210 satisfies one or more of the following preset ratio conditions:

(1) the ratio of the number of the white filter units 202 to the number of the plurality of filter units is less than or equal to 20% and greater than or equal to 5%;

(2) the ratio of the number of the transparent filter units 203 to the number of the plurality of filter units is less than or equal to 9% and greater than or equal to 4%;

(3) the ratio of the number of the red filter units 2011 to the number of the plurality of filter units is greater than or equal to 15%;

(4) the ratio of the number of the green filter units 2012 to the number of the plurality of filter units is greater than or equal to 24%;

(5) the ratio of the number of the blue filter units 2013 to the number of the plurality of filter units is greater than or equal to 24%.

On the basis of satisfying one or more of the above proportional conditions, optionally, in N rows of filter units of the filter unit array 201, each row of filter units includes: a red filter 2011, a green filter 2012, and a blue filter 2013. Thus, in this embodiment, the ambient light sensor 200 can uniformly sample the light signals of the plurality of colors, and the detection effect of the ambient light sensor 200 on the light signals of the plurality of colors can be further improved to improve the detection accuracy and detection performance of the ambient light sensor 200.

Optionally, on the basis that each row of filter units of filter unit array 210 includes red filter unit 2011, green filter unit 2012, and blue filter unit 2013, one or more rows of filter units in filter unit array 210 further include white filter unit 202.

Optionally, in the filter unit array 210, each row of filter units may further include: a white filter unit 202 to achieve uniform sampling of the white light signal by the ambient light sensor 200.

Optionally, each row of the filter units of the filter unit array 210 includes only one white filter unit 202, and by this embodiment, while the ambient light sensor 200 is ensured to uniformly sample the white light signal, it is also possible to avoid that a large number of white filter units 202 affects the detection effect of the ambient light sensor 200 on the color light signal.

Alternatively, in the embodiment of the present application, the row arrangement direction of the N rows of filter units in the filter unit array 210 may be parallel to the row scanning direction of the display screen 110.

In this embodiment, since the light emitting pixels of the display panel 110 are refreshed downward row by row for image display, in order to reduce the influence of light leakage of the display panel 110 on the ambient light sensor 200, each row of the N rows of the filter units of the filter unit array 210 includes a red filter unit 2011, a green filter unit 2012 and a blue filter unit 2013. When the display screen 110 refreshes each row of light-emitting pixels, the red filter unit 2011, the green filter unit 2012 and the blue filter unit 2013 in each row of filter units can simultaneously collect light signals, so that light leakage of the display screen 110 can be accurately detected, and the detection precision of the ambient light sensor 200 on ambient light can be improved.

On the basis of the embodiments of the above application, optionally, in M columns of filter units of the filter unit array 201, each column of filter units includes: a red filter 2011, a green filter 2012, and a blue filter 2013. In other words, in the embodiment of the present application, each row and each column of the filter unit array 210 includes: a red filter 2011, a green filter 2012, and a blue filter 2013.

Optionally, each column of filter units may further include: a white filter unit 202. In other words, each row and each column of the filter unit array 210 includes: a red filter 2011, a green filter 2012, a blue filter 2013, and a white filter 202.

Through the technical solution of this embodiment, the ambient light sensor 200 can more uniformly and comprehensively sample the light signals of multiple colors and the white light signals, so as to further improve the detection effect of the ambient light sensor 200 on the light signals of multiple colors and the white light signals, and improve the detection accuracy and the detection performance of the ambient light sensor 200.

Fig. 12 is a schematic diagram of another filter cell array 210 according to an embodiment of the present disclosure.

As shown in fig. 12, in the embodiment of the present application, the filter unit array 210 further includes: the light blocking unit 204 blocks and absorbs light signals. In addition, in the pixel unit array 220, a pixel unit corresponding to the light blocking unit is provided, and the pixel unit is used to detect the noise floor of the ambient light sensor 200.

Specifically, in the embodiment of the present application, in the ambient light sensor 200, the pixel unit array 220 includes a plurality of pixel units for sensing light signals, and also includes other necessary related devices and metal wires to form a detection circuit. When the pixel unit does not receive the light signal, a current signal (also called dark current) is also formed inside the detection circuit due to the influence of various factors such as the ambient temperature and the operation time. When the pixel cell receives the light signal, the current signal may form a noise floor of the ambient light sensor 200, interfere with and affect the final detection result of the ambient light sensor 200.

In view of this, in the filter unit array 210 of the environmental sensor 200, a light blocking unit 204 is provided in addition to the filter unit, and the light blocking unit 204 may also be regarded as a black filter unit for absorbing and blocking all visible light signals and infrared light signals and the like in the environmental light. When a pixel cell corresponding to the filter cell in the pixel cell array 220 receives a light signal for ambient light detection, a pixel cell corresponding to the light blocking unit 204 in the pixel cell array 220 does not receive the light signal for detecting the background noise of the ambient light sensor 200. With this embodiment, the pixel unit corresponding to the light blocking unit 204 is used to detect the background noise of the ambient light sensor 200, the detection of the background noise has high accuracy, and the background noise can be used to correct the pixel value of the pixel unit corresponding to the filtering unit in the pixel unit array 220, so as to further improve the detection accuracy and detection performance of the ambient light sensor 200.

Alternatively, as shown in fig. 11, the size of the light blocking unit 204 is the same as that of the filtering unit. With this embodiment, it is possible to facilitate the manufacturing of the light blocking unit 204 together with the filtering unit, and also facilitate the correction of the pixel value of the pixel unit corresponding to the filtering unit using the pixel value of the pixel unit corresponding to the light blocking unit 204.

Alternatively, as shown in fig. 11, in the filter unit array 210, one light blocking unit 204 is provided at an end of each of N rows of filter units. By this embodiment, the light blocking units 204 can be uniformly disposed at the edge of the filter unit array 210, which does not affect the detection of the optical signal by the pixel units corresponding to the filter units, and provide the noise floor information for the pixel units corresponding to each row of filter units, so as to accurately correct the pixel values of the pixel units corresponding to each row of filter units, and improve the signal-to-noise ratio of the ambient light sensor 200.

Optionally, in this embodiment of the present application, the row arrangement direction of the N rows of filter units in the filter unit array 210 is parallel to the row scanning direction of the display screen 110.

As described above, the light emitting pixels of the display screen 110 are refreshed downward row by row to perform image display, and in order to reduce the influence of light leakage of the display screen 110 on the ambient light sensor 200, in the N rows of filtering units of the filtering unit array 210, one light blocking unit 204 is disposed at an end of each row of filtering units to detect the noise information of the pixel units corresponding to each row of filtering units, so as to ensure that the signal to noise ratio of the ambient light sensor 200 is not reduced by interference of the display screen 110 in various scenes, and further improve the detection accuracy of the ambient light sensor 200 on the ambient light.

Alternatively, referring to the filter unit array 210 shown in fig. 3 to 5 and fig. 7 to 12, a gap may be formed between two adjacent filter units, and the width of the gap may be greater than or equal to 20 μm. Specifically, the two adjacent filter units are two adjacent filter units in a row direction or two adjacent filter units in a column direction. Alternatively, in some embodiments, the gap may correspond to 3 or more than 3 pixel cells.

Through the embodiment, a gap is designed between two adjacent filtering units, so that under the condition that the preparation process of the filtering units is fluctuated, the two adjacent filtering units can be prevented from overlapping, and the quality of the optical signal collected by the ambient light sensor 200 is ensured so as to ensure the detection effect of the ambient light sensor 200. In addition, an optical signal crosstalk phenomenon may occur between two adjacent filter units, and the closer the distance between two adjacent filter units, the greater the crosstalk degree. Therefore, a gap with a certain width is designed between two adjacent filtering units, so that the crosstalk phenomenon between the two adjacent filtering units can be reduced, and the quality of the optical signal collected by the ambient light sensor 200 can be further ensured to ensure the detection effect of the ambient light sensor 200.

Alternatively, in some embodiments, the area of each filtering unit may be greater than 36 μm × 36 μm, so as to ensure the filtering performance of each filtering unit and reduce the crosstalk phenomenon between two adjacent filtering units. Alternatively, each filter unit may correspond to a plurality of pixel units in the pixel unit array 220. For example, each filter unit corresponds to P × P pixel units in the pixel unit array 220, where P is a positive integer greater than or equal to 5.

The embodiment of the present application further provides an electronic device, which may include the ambient light sensor 200 and the display screen 110 of any of the above application embodiments, where the ambient light sensor 200 is disposed below the display screen 110.

Optionally, the ambient light sensor 200 is disposed below the display area in the display screen 110.

Specifically, an ambient light sensor 200 is disposed in the electronic device, and sensing data detected by the ambient light sensor 200 can be used to adjust an optical parameter of the display screen 110. For example, the color temperature of the ambient light detected by the ambient light sensor 200 can be used to adjust the color temperature of the display screen 110, and the illuminance of the ambient light detected by the ambient light sensor 200 can be used to adjust the brightness of the display screen 110. Through the technical scheme of the embodiment of the application, the display screen 110 can be adjusted more comprehensively aiming at the ambient light, so that the use experience of a user on the electronic equipment is improved.

In addition, because the ambient light sensor 200 provided in the embodiment of the present application has higher detection accuracy and detection performance, and the ambient light sensor 200 is provided in the electronic device, the adjustment of the display screen 110 can be more accurate to adapt to the current ambient light, so that the user experience of the electronic device is further improved.

It should be understood that the specific examples are provided solely to assist those skilled in the art in better understanding the embodiments of the present application and are not intended to limit the scope of the embodiments of the present application.

It should also be understood that the various embodiments described in this application can be implemented individually or in combination, and the examples in this application are not limited thereto.

For convenience of description, like reference numerals denote like parts in the embodiments of the present application, and a detailed description of the like parts is omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only exemplary and should not constitute any limitation to the present application.

Unless otherwise defined, all technical and scientific terms used in the examples of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present application. The terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The term "and/or" in this application is only one kind of association relationship describing the association object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: there are three cases of A, A and B, and B. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (16)

1. An ambient light sensor configurable to be disposed below a display screen of an electronic device, the ambient light sensor comprising:

the array of the light filtering units comprises a plurality of light filtering units, the plurality of light filtering units comprise blue light filtering units and transparent light filtering units, the ratio of the number of the blue light filtering units to the number of the plurality of light filtering units is greater than or equal to 24%, and the ratio of the number of the transparent light filtering units to the number of the plurality of light filtering units is less than or equal to 9%;

the pixel unit array is located filter unit array below, the pixel unit array includes a plurality of pixel units, a plurality of pixel units are used for receiving the ambient light and pass through the display screen and the light signal behind a plurality of filter units is in order to carry out the ambient light and detect.

2. The ambient light sensor of claim 1, wherein the plurality of filter units further comprises a red filter unit, the number of red filter units is less than or equal to the number of blue filter units, and a ratio of the number of red filter units to the number of the plurality of filter units is greater than or equal to 15%.

3. The ambient light sensor of claim 2, wherein a ratio of pixel values of pixel units corresponding to the blue filter unit and the red filter unit is used for detecting a color temperature of ambient light.

4. The ambient light sensor according to any of claims 1 to 3, wherein the plurality of filter units further comprises a green filter unit, and a ratio of the number of green filter units to the number of the plurality of filter units is greater than or equal to 24%.

5. The ambient light sensor of claim 4, wherein the pixel value of the pixel unit corresponding to the green filter unit is used to detect an illuminance of ambient light.

6. The ambient light sensor according to any one of claims 1 to 3, wherein the plurality of filter units further include a white filter unit, the white filter unit is configured to pass visible light signals and block infrared light signals, the transparent filter unit is configured to pass visible light signals and infrared light signals, and the pixel unit corresponding to the white filter unit and the pixel unit corresponding to the transparent filter unit are configured to jointly detect a signal amount of the infrared light signals in ambient light.

7. The ambient light sensor of claim 6, wherein a ratio of the number of white filter cells to the number of the plurality of filter cells is less than or equal to 20%.

8. The ambient light sensor according to claim 6, wherein a ratio of the number of the white filter units to the number of the plurality of filter units is greater than or equal to 5%, and/or a ratio of the number of the transparent filter units to the number of the plurality of filter units is greater than or equal to 4%.

9. The ambient light sensor according to claim 6, wherein the white filter unit and/or the transparent filter unit are located at edge regions of the plurality of filter units.

10. The ambient light sensor according to any one of claims 1 to 3, wherein the plurality of filter units are arranged in N rows, a row arrangement direction of the N rows of filter units is parallel to a row scanning direction of the display screen, and each row of filter units of the N rows of filter units comprises: the color filter comprises a red filter unit, a green filter unit and the blue filter unit, wherein N is a positive integer.

11. The ambient light sensor of claim 10, wherein each row of the N rows of filter cells further comprises a white filter cell.

12. The ambient light sensor of any of claims 1 to 3, wherein the array of filter cells further comprises: a light blocking unit for blocking and absorbing a light signal;

the pixel unit corresponding to the light blocking unit in the pixel unit array is used for detecting the background noise of the ambient light sensor.

13. The ambient light sensor according to claim 12, wherein the plurality of filter units are arranged in N rows, a row arrangement direction of the N rows of filter units is parallel to a row scanning direction of the display screen, and one of the light blocking units is provided at an end of each row of the N rows of filter units, where N is a positive integer.

14. The ambient light sensor according to any of claims 1 to 3, wherein a gap is formed between two adjacent filter units in the array of filter units, and the width of the gap is greater than 20 μm.

15. The ambient light sensor according to any one of claims 1 to 3, wherein each filter cell in the array of filter cells corresponds to P x P pixel cells in the array of pixel cells, where P is a positive integer greater than or equal to 5.

16. An electronic device, comprising: display screen and

the ambient light sensor of any of claims 1-15, wherein the ambient light sensor is disposed below the display screen, and wherein sensed data detected by the ambient light sensor is used to adjust an optical parameter of the display screen.

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