CN109036163B - Display device and ambient light detection method thereof - Google Patents
Display device and ambient light detection method thereof Download PDFInfo
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- CN109036163B CN109036163B CN201811012396.6A CN201811012396A CN109036163B CN 109036163 B CN109036163 B CN 109036163B CN 201811012396 A CN201811012396 A CN 201811012396A CN 109036163 B CN109036163 B CN 109036163B
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- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 238000002834 transmittance Methods 0.000 claims abstract description 37
- 229920001621 AMOLED Polymers 0.000 claims abstract description 4
- 230000010287 polarization Effects 0.000 claims description 61
- 238000005259 measurement Methods 0.000 abstract description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 16
- 210000002858 crystal cell Anatomy 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4204—Photometry, e.g. photographic exposure meter using electric radiation detectors with determination of ambient light
Abstract
The invention provides a display device and an ambient light detection method thereof, belongs to the technical field of display, and can solve the problem that an existing ambient light sensor is influenced by light emitted by an AMOLED panel to cause inaccurate measurement results. In the display device, the light emitted to the polarized light adjusting component after the ambient light is polarized by the polarizer contains polarized light, the light emitted to the polarized light adjusting component by the display panel is unpolarized light, and meanwhile, in the first state and the second state, the transmittance of the polarized light adjusting component to the polarized ambient light emitted after passing through the polarizer and the display panel is different, and the unpolarized light emitted by the display panel is unchanged, so the transmitted light intensity in different transmittance states is detected, the light intensity of the ambient light originally emitted to the display panel can be calculated, the influence of the display panel on the ambient light measurement is eliminated in the display device, and the detection result is more accurate.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a display device and an ambient light detection method thereof.
Background
Currently, the mainstream Display device is generally a Liquid Crystal Display (LCD) panel or an Active-Matrix Organic Light Emitting Display (AMOLED) panel. Compared with a liquid crystal display panel, the AMOLED has the advantages of high reaction speed, high contrast ratio, wide viewing angle, low power consumption, small module thickness and the like. Also, AMOLEDs are used in wearable products, which can be made thinner and lighter in shape specification, and thus, AMOLEDs are used as display panels in more and more wearable products at present.
The inventor finds that at least the following problems exist in the prior art: when the AMOLED is worn, an ambient light sensor for measuring the light intensity of ambient light is often arranged below an AMOLED panel so as to improve the screen occupation ratio of a product. Since a small part of light emitted by the AMOLED display panel leaks to the lower side of the AMOLED display panel, the ambient light measured by the ambient light sensor is affected by the light emitted by the AMOLED display panel, and the measurement result is inaccurate.
Disclosure of Invention
The invention provides a display device and an ambient light detection method thereof, aiming at the problem that the existing ambient light sensor is influenced by light emitted by an AMOLED panel to cause inaccurate measurement results.
The technical scheme adopted for solving the technical problem of the invention is as follows:
a display device, comprising:
a display panel;
the polarizer is arranged outside the light emergent surface of the display panel and is used for changing the polarization of the ambient light which is transmitted into the display panel through the polarizer;
the display device comprises a polarization adjustment component and a display panel, wherein the polarization adjustment component comprises a first state and a second state, and the transmittance of the polarization adjustment component to polarized ambient light entering the display panel after passing through a polarizer is different in the first state and the second state;
and the light detector is used for respectively detecting the transmitted light intensity after passing through the first state and the second state and calculating the light intensity of the ambient light according to the transmittance.
Optionally, the polarizer comprises a first polarizer.
Optionally, the polarization adjustment component includes a second polarizer, the second polarizer is disposed between the display panel and the photodetector, and the second polarizer includes a polarization region and an opening region; the polarization adjustment member of the polarization area has a first state, and the polarization adjustment member of the opening area has a second state.
Optionally, the light detector includes a first sensor for detecting the transmitted light intensity of the light deflection region and a second sensor for detecting the transmitted light intensity of the opening region.
Optionally, the transmittance of the polarized light region to ambient light is nPOL2AThe transmittance of the light polarized area to the light emitted by the display panel is nPOL2PThe transmittance of the first polarizer is nPOL1The transmittance of the display panel is nPNLThe transmitted light intensity detection values of the first sensor and the second sensor are respectively as follows: LVALS1、LVALS2What is, what isThe light intensity of the ambient light is LVAWherein, in the step (A),
optionally, the polarization adjustment member includes a liquid crystal cell and a third polarizer disposed closer to the photodetector than the liquid crystal cell, wherein a first voltage is applied to the liquid crystal cell to cause the polarization adjustment member to have the first state, and a second voltage is applied to the liquid crystal cell to cause the polarization adjustment member to have the second state.
Optionally, the display panel is an OLED panel.
Optionally, a supporting layer is disposed between the display panel and the polarization adjustment component, the supporting layer is provided with an opening, and the polarization adjustment component is disposed at a position corresponding to the opening.
Optionally, the display device is a wearable AMOLED.
The invention also provides an ambient light detection method of the display device, which comprises the following detection steps:
the polarizer changes the polarization of the ambient light entering the panel;
respectively acquiring the transmittance of polarized ambient light which is incident after passing through a polarizer and a display panel in a first state and a second state of the polarization adjustment component;
the light detector detects the transmitted light intensity after passing through the first state and the second state respectively, and calculates the light intensity of the ambient light according to the transmittance.
Drawings
Fig. 1 is a schematic structural diagram of a display device according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a display device according to embodiment 2 of the present invention;
fig. 3 is another schematic structural diagram of a display device according to embodiment 2 of the present invention;
fig. 4 is a schematic view of the display device and the propagation of ambient light according to embodiment 2 of the present invention;
fig. 5 is a schematic structural diagram of a display device according to embodiment 2 of the present invention;
wherein the reference numerals are: 1. a display panel; 2. a polarizer; 21. a first polarizer; 3. a polarization adjustment member; 32. a second polarizer; 33. an open area; 34. a light deflection area; 35. a third polarizer; 36. a liquid crystal cell; 4. a photodetector; 41. a first sensor; 42. a second sensor; 5. and (4) a support layer.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1:
the present embodiment provides a display device, as shown in fig. 1, including a display panel 1, a polarizer 2, a polarization adjustment member 3, and a photodetector 4: the polarizer 2 is arranged outside the light emergent surface of the display panel 1 and is used for changing the polarization of the ambient light which is emitted into the display panel 1 through the polarizer; the polarization adjustment member 3 includes a first state and a second state, and the transmittance of the polarization adjustment member 3 to polarized ambient light incident after passing through the polarizer 2 and the display panel 1 is different in the first state and the second state; the light detector 4 is used for detecting the transmitted light intensity after passing through the first state and the second state respectively, and calculating the light intensity of the ambient light according to the transmittance.
In the display device of this embodiment, the light emitted from the ambient light to the polarization adjustment member 3 after being polarized by the polarizer 2 contains polarized light, while the light of the display panel 1 directed to the polarization adjustment member 3 is unpolarized light, since in the first state and the second state, the polarization adjustment member 3 has different transmittances with respect to polarized ambient light incident after passing through the polarizer 2 and the display panel 1, the intensity of the unpolarized light emitted from the display panel 1 is constant in a short time, and the transmittance of the polarization adjusting member 3 for the unpolarized light emitted from the display panel 1 is the same in the first state and the second state, so that the transmitted light intensity in different transmittance states is detected, the intensity of the ambient light originally emitted to the display panel 1 can be calculated, and the display device of the embodiment eliminates the influence of the display panel 1 on the ambient light measurement, so the detection result is more accurate.
Example 2:
the present embodiment provides a display device, as shown in fig. 2 to 5, including a display panel 1, a polarizer, a polarization adjustment member, and a photodetector 4: the polarizer comprises a first polarizer 21, which is arranged outside the light emergent surface of the display panel 1 and used for changing the polarization of the ambient light entering the display panel 1 through the polarizer; the polarization adjustment member includes a first state and a second state, and the transmittance of the polarization adjustment member to polarized ambient light incident after passing through the polarizer and the display panel 1 is different in the first state and the second state; the light detector 4 is used for detecting the transmitted light intensity after passing through the first state and the second state respectively, and calculating the light intensity of the ambient light according to the transmittance.
The first polarizer 21 in this embodiment functions to suppress reflection of ambient light by the display panel 1; the second is that light emitted from the ambient light to the display panel 1 can be converted into polarized light. The polarizer may be various polarizing members, such as a polarizing plate or a nicol prism, other films that can generate polarized light, or a polarizer that converts the ambient light emitted to the display panel 1 into circularly polarized light. The polarizer can only allow light parallel to a certain direction to pass through, namely, the polarizer has a certain transmission direction, so that the detection of the photodetector 4 is facilitated, and the polarizer is selected here.
In one embodiment, the polarization adjustment means includes a second polarizing plate 32, the second polarizing plate 32 is disposed between the display panel 1 and the photodetector 4, and the second polarizing plate 32 includes a polarizing region 34 and an opening region 33; the polarization adjustment member of the polarization area 34 has a first state, and the polarization adjustment member of the opening area 33 has a second state.
In the first state, the polarized light R1 polarized by the polarizer of the ambient light and a small amount of light emitted from the display panel 1 are directed to the polarized light region 34, and in the second state, the polarized light R1 polarized by the polarizer 2 of the ambient light and a small amount of light emitted from the display panel 1 are directed to the opening region 33, and the light intensity of the ambient light originally directed to the display panel 1 can be calculated according to the light intensities transmitted by the polarized light region 34 and the opening region 33 detected by the photodetector 4 because the transmittance of the polarized light region 34 and the opening region 33 to R1 is different.
The photodetector 4 is not particularly limited in this embodiment, and may be a member for detecting light intensity or light brightness, for example. Specifically, it may be a photo sensor which can measure the transmitted light intensity of the opening area 33 in two times, one time, and the other time, the transmitted light intensity of the polarized light area 34.
As an alternative in the present embodiment, the photodetector 4 includes a first sensor 41 for detecting the transmitted light intensity of the polarized light region 34 and a second sensor 42 for detecting the transmitted light intensity of the open region 33.
As shown in fig. 3, the first sensor 41 and the second sensor 42 can detect the transmitted light intensity in the first state and the second state at the same time, so that the detection efficiency is higher.
Optionally, the ambient light has a light intensity of LVAThe light intensity after passing through the polarizing parts of the first polarizer, the display panel 1 and the second polarizer is LVA’、LVA”、LVA”’，LVPThe intensity of light transmitted downwards, LV, for the display panel 1P' is the intensity of light after passing through the second polarizer. The transmitted light intensity detection values of the first sensor 41 and the second sensor 42 are respectively: LVALS1、LVALS2The transmittance of the first polarizer 21 is nPOL1The transmittance of the display panel 1 is nPNLThe transmittance of the light deflection area 34 to the ambient light is nPOL2AThe transmittance of the light emitted from the display panel 1 by the light deflecting region 34 is nPOLPDue to LVAAfter passing through the first polarizer, the light becomes polarized light or partially polarized light, the light emitted from the display panel 1 is unpolarized light, and the polarized light regions 34 of the second polarizer 32 have different transmittances for the two lights, n isPOL2AAnd nPOL2PThus:
wherein n isPOL1，nPNL，nPOL2A，nPOL2PFor a known parameter, LVALS1、LVALS2For the measured values, it can be calculated that:
in another embodiment, as shown in fig. 5, the polarization adjustment member 3 includes a liquid crystal cell 36 and a third polarizer 35, and the third polarizer 35 is disposed closer to the photodetector 4 than the liquid crystal cell 36, wherein a first voltage is applied to the liquid crystal cell 36 to cause the polarization adjustment member 3 to have the first state, and a second voltage is applied to the liquid crystal cell 36 to cause the polarization adjustment member 3 to have the second state.
That is, in this embodiment, the light detector 4 applies different voltages to the liquid crystal cell 36 twice respectively, so that the deflection angles of the liquid crystal in the two times are different, the transmission filters of the liquid crystal are different, and the transmission light intensities after passing through the polarization adjustment component are measured twice, that is, the transmission rates after passing through the liquid crystal cell 36 and the third polarizer 35 twice are different, so that two different transmission light intensities are measured, and then the light intensity of the ambient light originally emitted to the display panel 1 is calculated by using the above formula.
In one embodiment, a support layer 5 is disposed between the display panel 1 and a polarization adjustment component, the support layer 5 is provided with an opening, and the polarization adjustment component is disposed at a position corresponding to the opening.
Among them, the supporting layer 5 mainly functions to enhance the mechanical strength of the display panel 1, dissipate heat, buffer external mechanical impact, and the like. When the support layer 5 is made of a light-impermeable material, the polarization adjustment member may be provided at a position corresponding to the opening in order to realize light recognition in the transmitted light intensity detection therebelow.
In one embodiment, the display panel 1 is an OLED panel.
It should be noted that a touch substrate, a glass cover plate, etc. may also be disposed on one side of the light-emitting surface of the OLED panel.
In one embodiment, the display device is a wearable AMOLED. In the AMOLED wearable type display, the polarization adjustment component 3 and the light detector 4 are arranged below the AMOLED panel so as to improve the product screen occupation ratio.
Example 3:
the present embodiment provides an ambient light detection method for a display device in the foregoing embodiment, including the following steps:
s01, changing the polarization of the ambient light entering the panel by the polarizer; that is, the light emitted from the ambient light to the polarization adjustment member after being polarized by the polarizer contains polarized light, and the light emitted from the display panel to the polarization adjustment member is unpolarized light. When the polarizer is a polarizer, the polarizer can not only convert the light emitted by the ambient light to the display panel into polarized light, but also inhibit the reflection of the display panel to the ambient light.
S02, respectively acquiring the transmittance of polarized ambient light incident after passing through the polarizer and the display panel in the first state and the second state of the polarization adjustment component; taking the polarization adjustment member as the second polarizer including the polarization region and the opening region as an example, in the first state, the polarized light R1 polarized by the polarizer of the ambient light and a small amount of light emitted from the display panel are directed to the polarization region, and in the second state, the polarized light R1 polarized by the polarizer of the ambient light and a small amount of light emitted from the display panel are directed to the opening region. The first polarizer has a transmittance of nPOL1The transmittance of the display panel is nPNLThe transmittance of the light deflection area to the ambient light is nPOL2AThe transmittance of the light polarized area to the light emitted by the display panel is nPOL2P，nPOL1，nPNL，nPOL2A，nPOL2PAre known parameters.
And S03, detecting the transmitted light intensity after passing through the first state and the second state by the light detector respectively, and calculating the light intensity of the ambient light according to the transmittance. Specifically, if the first sensor and the second sensor of the photodetector are used for detecting the transmitted light of the polarized light region and the opening region, respectivelyStrong, and the detection values are respectively: LVALS1、LVALS2Then LVALS1、LVALS2For the measured values, it can be calculated that:
example 4:
the present embodiment provides a display device, which may be: the display device comprises any product or component with a display function, such as a liquid crystal display panel, electronic paper, a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (7)
1. A display device, comprising:
a display panel;
the polarizer is arranged outside the light emergent surface of the display panel and is used for changing the polarization of the ambient light which is transmitted into the display panel through the polarizer;
the display device comprises a polarization adjustment component and a display panel, wherein the polarization adjustment component comprises a first state and a second state, and the transmittance of the polarization adjustment component to polarized ambient light entering the display panel after passing through a polarizer is different in the first state and the second state;
the light detector is used for respectively detecting the transmitted light intensity after passing through the first state and the second state and calculating the light intensity of the ambient light according to the transmittance;
the polarizer comprises a first polarizer;
the polarization adjusting component comprises a second polarizer, the second polarizer is arranged between the display panel and the light detector, and the second polarizer comprises a polarization area and an opening area; the polarization adjustment member of the polarization area has a first state, and the polarization adjustment member of the opening area has a second state.
2. The display device according to claim 1, wherein the light detector includes a first sensor for detecting a transmitted light intensity of the polarized light region and a second sensor for detecting a transmitted light intensity of the opening region.
3. The display device according to claim 2, wherein the polarizing region has a transmittance of n to ambient lightPOL2AThe transmittance of the light polarized area to the light emitted by the display panel is nPOL2PThe transmittance of the first polarizer is nPOL1The transmittance of the display panel is nPNLThe transmitted light intensity detection values of the first sensor and the second sensor are respectively as follows: LVALS1、LVALS2The intensity of the ambient light is LVAWherein, in the step (A),
4. the display device according to claim 1, wherein the display panel is an OLED panel.
5. The display device according to claim 1, wherein a support layer is provided between the display panel and the polarization adjustment member, the support layer is provided with an opening, and the polarization adjustment member is provided at a position corresponding to the opening.
6. The display device of claim 1, wherein the display device is a wearable AMOLED.
7. An ambient light detection method for a display device according to any one of claims 1 to 6, comprising the steps of:
the polarizer changes the polarization of the ambient light entering the panel;
respectively acquiring the transmittance of polarized ambient light which is incident after passing through a polarizer and a display panel in a first state and a second state of the polarization adjustment component;
the light detector detects the transmitted light intensity after passing through the first state and the second state respectively, and calculates the light intensity of the ambient light according to the transmittance.
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| CN101836263A (en) * | 2007-09-27 | 2010-09-15 | Asml荷兰有限公司 | Spectral filter, lithographic apparatus including such a spectral filter, device manufacturing method, and device manufactured thereby |
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| CN109036163A (en) | 2018-12-18 |
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