CN107577077B - Ambient light and temperature detection circuit, display panel and display device - Google Patents
Ambient light and temperature detection circuit, display panel and display device Download PDFInfo
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- CN107577077B CN107577077B CN201710822450.2A CN201710822450A CN107577077B CN 107577077 B CN107577077 B CN 107577077B CN 201710822450 A CN201710822450 A CN 201710822450A CN 107577077 B CN107577077 B CN 107577077B
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Abstract
The disclosure provides an ambient light and temperature detection circuit, a display panel and a display device. The ambient light and temperature detection circuit includes: a ring oscillator including an odd number of inverters, the inverters being shaded and connected end to end in series to form a loop; an ambient light detector comprising a plurality of phototransistors, an output terminal of each of the phototransistors being coupled to an output terminal of the inverter, respectively; and the control unit is coupled to the control end of the photosensitive transistor and used for outputting a control signal to control the on and off of the ambient light detector. According to the display panel, on one hand, the detection of the ambient light intensity and the ambient temperature on the display panel is realized through the opening and closing of the ambient light detector; on the other hand, by integrating the ambient light detection circuit and the temperature detection circuit into one circuit, the circuit area and power consumption are reduced.
Description
Technical Field
The disclosure relates to the field of display, in particular to an ambient light and temperature detection circuit, a display panel comprising the ambient light and temperature detection circuit and a display device.
Background
With the progress of science and technology, more and more electronic devices enter the life of people, such as terminal devices of smart phones, tablet computers, liquid crystal televisions and the like, and enrich and facilitate the daily life of people. Since the liquid crystal display panel is prominent in brightness, contrast, color, viewing angle, and the like, the display panel in the market at present is mainly a liquid crystal display panel.
The display panel is one of important components for acquiring information in the electronic device, and the display effect and the energy consumption are important indexes for evaluating the display panel. In the liquid crystal display panel, liquid crystal drifts with the change of temperature, and the electrical characteristics of other elements in the display panel also change with the change of temperature, so that the display effect changes along with the change of the temperature of the display panel. Meanwhile, the display panel keeps high brightness for a long time to increase energy consumption, and low brightness influences the display effect, so that the temperature and the ambient light of the display panel need to be detected, the display effect of the display panel is adjusted according to the detected temperature and the detected ambient light intensity, and the user experience is improved.
The circuits for detecting temperature and ambient light and the detection mechanism are different, and if the two circuits are simply integrated in the display panel, the circuit area and power consumption can be increased, which is not beneficial to realizing the lightness and thinness of the product. Therefore, how to simply and efficiently detect the temperature and the ambient light of the display panel becomes a technical problem which needs to be solved urgently in the field.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
An object of the present disclosure is to provide an ambient light and temperature detection circuit, a display panel, and a display device, thereby overcoming, at least to some extent, one or more problems due to limitations and disadvantages of the related art.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.
According to a first aspect of the present disclosure, there is provided an ambient light and temperature detection circuit comprising:
a ring oscillator including an odd number of inverters, the inverters being shaded and connected end to end in series to form a loop;
an ambient light detector comprising a plurality of phototransistors, an output terminal of each of the phototransistors being coupled to an output terminal of the inverter, respectively;
and the control unit is coupled to the control end of the photosensitive transistor and used for outputting a control signal to control the on and off of the ambient light detector.
In an exemplary embodiment of the present disclosure, the ambient light and temperature detection circuit further includes:
the temperature acquisition unit is used for acquiring a temperature parameter according to the frequency of a first voltage pulse signal output by the ring oscillator when the ambient light detector is turned off;
and the light intensity acquisition unit is used for acquiring the light intensity parameter of the ambient light according to the frequency of the second voltage pulse signal output by the ring oscillator when the ambient light detector is started.
In an exemplary embodiment of the present disclosure, the number of inverters is 2n +1, where n is a positive integer.
In an exemplary embodiment of the present disclosure, an output terminal of each of the inverters is coupled to an output terminal of one or more of the photo transistors.
In an exemplary embodiment of the present disclosure, the inverter includes one or more of an inverter composed of NMOS transistors, an inverter composed of PMOS transistors.
In an exemplary embodiment of the present disclosure, the phototransistor includes one or more of a phototransistor or a phototransistor.
In one exemplary embodiment of the present disclosure, the photosensitive thin film transistor includes one or more of a P-type photosensitive thin film transistor, an N-type photosensitive thin film transistor.
According to a second aspect of the present disclosure, there is provided a method of detecting ambient light and temperature, applied to any one of the above-mentioned ambient light and temperature detection circuits; the method comprises the following steps:
controlling the ambient light detector to be closed through the control signal, and obtaining a temperature parameter according to the frequency of a first voltage pulse signal output by the ring oscillator;
and controlling the ambient light detector to be started through the control signal, and obtaining the intensity parameter of the ambient light according to the frequency of the second voltage pulse signal output by the ring oscillator.
According to a third aspect of the present disclosure, there is provided a display panel comprising the ambient light and temperature detection circuit of any one of the above.
In an exemplary embodiment of the present disclosure, the ambient light and temperature detection circuit is disposed in a non-display area around the display panel or a display area of the display panel.
According to a fourth aspect of the present disclosure, there is provided a display device including the display panel of any one of the above.
According to the technical scheme, the ambient light and temperature detection circuit in the exemplary embodiment of the disclosure has at least the following advantages and positive effects:
in the technical scheme provided by the disclosure, a ring oscillator composed of odd number of inverters and an ambient light detector composed of a plurality of phototransistors are integrated into a circuit, the control unit controls the on and off of the ambient light detector to enable the ring oscillator to output corresponding voltage pulse signals, and a temperature parameter and an intensity parameter of ambient light are obtained according to the corresponding relation between the frequency of the output voltage pulse signals and the temperature and the ambient light intensity; on the other hand, different voltage pulse signals are output by controlling the on and off of the ambient light detector in the circuit, and the temperature parameter and the ambient light intensity parameter are obtained according to the frequency of the voltage pulse signals, so that the detection efficiency is improved; on the other hand, the detection circuit in the disclosure is only composed of the phase inverter, the phototransistor and the control unit, the circuit structure is simple, and the manufacturing cost is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
FIG. 1 shows a schematic diagram of an ambient light and temperature sensing circuit in an exemplary embodiment of the present disclosure;
FIG. 2 is a diagram illustrating the correspondence between the frequency of the control signal and the frequency of the output voltage pulse signal in an exemplary embodiment of the disclosure;
FIG. 3 shows a schematic diagram of an ambient light and temperature sensing circuit in an exemplary embodiment of the present disclosure;
FIG. 4 shows a schematic diagram of an ambient light and temperature sensing circuit in an exemplary embodiment of the present disclosure;
FIG. 5 shows a schematic diagram of an inverter structure in an exemplary embodiment of the present disclosure;
FIG. 6 shows a method flow diagram for ambient light and temperature detection in an exemplary embodiment of the present disclosure;
FIG. 7 shows a schematic diagram of a display panel structure in an exemplary embodiment of the present disclosure;
fig. 8 shows a schematic diagram of a display panel structure in an exemplary embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and the like. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure.
The terms "a," "an," "the," and "said" are used in this specification to denote the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first" and "second", etc. are used merely as labels, and are not limiting on the number of their objects.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities.
The present exemplary embodiment provides an ambient light and temperature detection circuit first, and the structure and operation of the ambient light and temperature detection circuit of the present disclosure will now be exemplarily described with reference to fig. 1.
As shown in FIG. 1, the ambient light and temperature detection circuit comprises an inverter 102, an inverter 103, an inverter 104, and a phototransistor MLIT1And a phototransistor MLIT2Wherein the output terminal of the inverter 102 is coupled to the input terminal of the inverter 103, the output terminal of the inverter 103 is coupled to the input terminal of the inverter 104, the output terminal of the inverter 104 is coupled to the input terminal of the inverter 102, and the inverter 102, the inverter 103 and the inverter 104 are connected end to end in series to form a ring oscillator. Phototransistor MLIT1And a phototransistor MLIT2The control ends of the two control units are connected with a control unit, and the control unit outputs a control signal VGTo control the phototransistor MLIT1And a phototransistor MLIT2On and off, the phototransistor MLIT1As an output terminal, coupled to the output terminal of the inverter 102, and a second terminal is grounded; phototransistor MLIT2Is coupled as an output terminal to the output terminal of the inverter 103, and has a second terminal connected to ground. The photosensitive transistor MLIT1And a phototransistor MLIT2Together forming an ambient light detector.
Changing the control signal V by the control unitGMay control the on and off of the ambient light detector. Taking the N-type phototransistor in FIG. 1 as an example, the control signal V shown in FIG. 2GA graph of the frequency of the output voltage pulse signal,when V isGAt low level, the phototransistor MLIT1And a phototransistor MLIT2Turning off, i.e. turning off the ambient light detector, when the ring oscillator outputs an oscillating voltage VOSCAccording to said oscillating voltage VOSCThe relationship of the frequency and the temperature can obtain a temperature parameter; when V isGAt a high level, the phototransistor MLIT1And a phototransistor MLIT2On, i.e. when the ambient light detector is on, the ring oscillator outputs another oscillating voltage VOSC' (not shown) according to the oscillating voltage VOSCThe relationship of the frequency of' to the intensity of the ambient light enables the intensity of the ambient light to be obtained. Under different ambient light and different temperatures, the frequency of the output voltage pulse signal is different, but the detection mechanism of the ambient light and the temperature is unchanged.
Since the present disclosure employs a circuit integrating an ambient light detection circuit and a temperature detection circuit, it is necessary to simultaneously realize detection of ambient light and temperature; in order to ensure the stability and correctness of the detection result, the inverter 102, the inverter 103, and the inverter 104 in the present disclosure may be shielded by a light shielding material, forming the light shielding region 101. The light-shielding material may be a light-shielding material commonly used in the art as long as the light-shielding effect can be achieved, such as a black PET film, a black matte paper, a light-shielding tape, a light-shielding fabric, and the like, and the details are not repeated herein.
According to the ambient light and temperature detection circuit, the temperature and the intensity of the ambient light can be conveniently and efficiently obtained by controlling the on and off of the ambient light detector; in the prior art, the wiring and detection mechanisms of the temperature detection circuit and the ambient light detection circuit are different, and the integrated ambient light and temperature detection circuit reduces the circuit area and power consumption caused by simple integration of the temperature detection circuit and the ambient light detection circuit; and the detection circuit in the disclosure adopts fewer components, the circuit structure is simple, and the manufacturing cost is reduced.
Although the above exemplary embodiment is described by taking an N-type photo transistor as an example, the photo transistor in the present disclosure may be any other transistor sensitive to light. For example, the phototransistor may be a phototransistor or a phototransistor, and when the phototransistor is a phototransistor, the phototransistor may be one or more of an N-type phototransistor and a P-type phototransistor.
For example, referring to fig. 3, an ambient light and temperature detection circuit composed of P-type photosensitive thin film transistors is shown, the structure of which differs from that of the ambient light and temperature detection circuit shown in fig. 1 only in that: the photosensitive thin film transistor is a P-type photosensitive thin film transistor; p-type photosensitive thin film transistor MLIT1Is coupled to the output terminal of the phase inverter 302 as an output terminal, and the other terminal is connected to a power supply VDD(ii) a P-type photosensitive thin film transistor MLIT2Is coupled to the output terminal of the inverter 303 as an output terminal, and a second terminal is connected to a power supply VDD. The working mechanism of the temperature detection circuit is similar to that of an ambient light and temperature detection circuit formed by an N-type photosensitive thin film transistor, and the difference is that: control signal V output by control unitGWhen the level is low, the ambient light detector is turned on; control signal VGAt high level, the ambient light detector is turned off.
For another example, referring to FIG. 4, an ambient light and temperature sensing circuit formed of N/P hybrid photosensitive thin film transistors is shown, the ambient light and temperature sensing circuit including four photosensitive thin film transistors, respectively N-type photosensitive thin film transistors MLIT1And MLIT2P-type photosensitive thin film transistor MLIT3And MLIT4Wherein the N-type photosensitive thin film transistor MLIT1And a P-type photosensitive thin film transistor MLIT3Is coupled as an output terminal to the output terminal of the inverter 402, and an N-type photo-sensitive thin film transistor MLIT1Is grounded, P-type photosensitive thin film transistor MLIT3The second terminal of the first transistor is coupled to a power supply VDD(ii) a N-type photosensitive thin film transistor MLIT2And a P-type photosensitive thin film transistor MLIT4Is coupled as an output terminal to the output terminal of the inverter 403, and the N-type photo-sensitive thin film transistor MLIT2Is grounded, P-type photosensitive thin film transistor MLIT4The second terminal of the first transistor is coupled to a power supply VDD(ii) a N-type photosensitive thin film transistor MLIT1And MLIT2Is coupled with a control unit, which outputs a control signal VGNCapable of controlling N-type photosensitive thin film transistor MLIT1And MLIT2On and off; p-type photosensitive thin film transistor MLIT3And MLIT4Is coupled with another control unit, which outputs a control signal VGPCapable of controlling P-type photosensitive thin film transistor MLIT3And MLIT4On and off.
It should be understood by those skilled in the art that the circuit configurations shown in fig. 1-4 are intended to illustrate the principles of operation of the temperature sensing circuit of the present disclosure, and not to limit the disclosure to include three inverters and two or four phototransistors, as other numbers of inverters and phototransistors may be included. According to some embodiments of the present disclosure, the number of inverters in the ambient light and temperature detection circuit described in the present disclosure may be 2n +1, where n is a positive integer. In addition, the output terminal of the phototransistor can be arbitrarily coupled to the output terminal of the inverter.
Further, the ambient light and temperature detection circuit in the present exemplary embodiment may further include a temperature acquisition unit for acquiring an oscillation voltage V output from the ring oscillator when the ambient light detector is turned off, and a light intensity acquisition unit for acquiring a light intensity of the ambient light and the light intensity of the light emitted from the ring oscillator when the ambient light detector is turned offOSCObtaining a temperature parameter; the light intensity obtaining unit is used for obtaining the oscillating voltage V output by the ring oscillator when the environment light detector is startedOSC' obtains an intensity parameter of the ambient light.
According to this disclosed ambient light and temperature detection circuitry, ambient light and temperature detection circuitry obtain the intensity of temperature and ambient light through the frequency of obtaining the voltage pulse signal corresponding with the temperature and the luminous intensity of current environment, because the measuring quantity is the frequency, therefore has strong, the high advantage of detection precision of interference killing feature.
Also provided in the present exemplary embodiment is a structure of an inverter, such as a CMOS inverter, which may includeA PMOS transistor and an NMOS transistor, and a supply voltage V associated with the CMOS inverterDDAnd a ground terminal. In addition, the inverter according to the exemplary embodiment of the present disclosure may further include an inverter formed of an NMOS transistor and/or an inverter formed of a PMOS transistor, and the present disclosure does not particularly limit a specific form of the inverter.
Further, the present exemplary embodiment also provides a method for detecting ambient light and temperature, which is applied to the above-mentioned ambient light and temperature detection circuit. The flow of the detection method is shown in fig. 6, and may include: by means of a control signal VGControlling the ambient light detector to be closed, and obtaining a temperature parameter according to the frequency of a first voltage pulse signal output by the ring oscillator; by said control signal VGAnd controlling the ambient light detector to be started, and obtaining the intensity parameter of the ambient light according to the frequency of the second voltage pulse signal output by the ring oscillator.
Further, the present exemplary embodiment also provides a display panel including the above-described ambient light and temperature detection circuit. Fig. 7 is a schematic diagram illustrating an exemplary embodiment of a display panel, and referring to fig. 7, the ambient light and temperature detection circuit is disposed in a non-display area of the display panel (i.e., an edge area of the display panel), nine inverters V1-V9 are disposed in the non-display area of the display panel, the inverters V1-V9 are sequentially connected end to form a ring oscillator, an output terminal of the inverter V3 is coupled to an output terminal of a phototransistor T1, an output terminal of the inverter V4 is coupled to an output terminal of the phototransistor T2, the phototransistors T1 and T2 form an ambient light detector, and control terminals of the phototransistors T1 and T2 are coupled to a control unit. The input terminal of the inverter V1 is coupled to the output terminal of the inverter V9, and the output terminal V of the inverter V1OSCAs the output of the ambient light and temperature sensing circuit.
Outputting a control signal V by a control unitGControlling the on and off of the phototransistors T1 and T2, i.e. controlling the on and off of the ambient light detector, according to the obtained voltage pulse signal when the ambient light detector is on and the electricity when the ambient light detector is offAnd pressing the pulse signal to obtain the frequency of the voltage pulse signal, and obtaining the intensity parameter and the temperature parameter of the ambient light by searching a corresponding relation table according to the frequency. Since the ambient light and temperature detection circuit shown in fig. 6 only includes one output terminal VOSCTherefore, detection errors caused by mutual influence among a plurality of output ends are avoided.
Further, the number of the inverters is not limited to nine, and the number of the phototransistors is not limited to two, and those skilled in the art can set any odd number (at least three) of the inverters and the phototransistors according to actual needs, and the phototransistors can be set on any one side, two sides, three sides of the display panel or around the display panel.
An exemplary embodiment of the present disclosure shows another structure of the display panel, as shown in fig. 8, the ambient light and temperature detection circuit is disposed in the display area AA of the display panel, and the detection method thereof is the same as the ambient light and temperature detection method of the display panel shown in fig. 7, and therefore, the description thereof is omitted.
Those skilled in the art will readily understand that the present disclosure may also include a scheme in which the ambient light and temperature detection circuit is disposed in the entire area of the display panel, and in addition, the present disclosure may also include a scheme in which the ambient light and temperature detection circuit is disposed in any one of the designated areas on the display panel.
Further, a display device is also provided in the present exemplary embodiment, and the display device may include the above display panel. The display device can be specifically a product or a component with any display function, such as a liquid crystal display, a liquid crystal television, an OLED display, an OLED television, electronic paper or a digital photo frame.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the terms of the appended claims.
Claims (10)
1. An ambient light and temperature detection circuit comprises a ring oscillator, wherein the ring oscillator comprises an odd number of inverters which are connected end to end in series to form a loop; it is characterized by also comprising:
the inverter is shielded from light;
an ambient light detector comprising a plurality of phototransistors, an output terminal of each of the phototransistors being coupled to an output terminal of the inverter, respectively;
and the control unit is coupled to the control end of the photosensitive transistor and used for outputting a control signal to control the on and off of the ambient light detector.
2. The ambient light and temperature detection circuit of claim 1, further comprising:
the temperature acquisition unit is used for acquiring a temperature parameter according to the frequency of a first voltage pulse signal output by the ring oscillator when the ambient light detector is turned off;
and the light intensity acquisition unit is used for acquiring the light intensity parameter of the ambient light according to the frequency of the second voltage pulse signal output by the ring oscillator when the ambient light detector is started.
3. The ambient light and temperature detection circuit of claim 1, wherein: the number of the inverters is 2n +1, wherein n is a positive integer.
4. The ambient light and temperature detection circuit of any of claim 3, wherein: the output end of the inverter is coupled with the output end of one or more photosensitive transistors.
5. The ambient light and temperature detection circuit of any of claims 1-4, wherein the inverter comprises one or more of an inverter comprising NMOS transistors, an inverter comprising PMOS transistors.
6. The ambient light and temperature detection circuit of any of claims 1-4, wherein the phototransistor comprises one or more of a phototransistor or a phototransistor.
7. The ambient light and temperature detection circuit of claim 6, wherein the photosensitive thin film transistor comprises one or more of a P-type photosensitive thin film transistor, an N-type photosensitive thin film transistor.
8. A method of detecting ambient light and temperature applied to an ambient light and temperature detection circuit according to any one of claims 1 to 7; the method is characterized in that:
controlling the ambient light detector to be closed through the control signal, and obtaining a temperature parameter according to the frequency of a first voltage pulse signal output by the ring oscillator;
and controlling the ambient light detector to be started through the control signal, and obtaining the intensity parameter of the ambient light according to the frequency of the second voltage pulse signal output by the ring oscillator.
9. A display panel, characterized in that: comprising an ambient light and temperature detection circuit as claimed in any one of claims 1-7.
10. A display device, characterized in that: comprising a display panel as claimed in claim 9.
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| US11698308B2 (en) * | 2020-10-05 | 2023-07-11 | Openlight Photonics, Inc. | Optical temperature measurements in photonic circuits |
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