CN111833781A - Light emitting diode circuit and touch detection method - Google Patents
Light emitting diode circuit and touch detection method Download PDFInfo
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- CN111833781A CN111833781A CN201910247545.5A CN201910247545A CN111833781A CN 111833781 A CN111833781 A CN 111833781A CN 201910247545 A CN201910247545 A CN 201910247545A CN 111833781 A CN111833781 A CN 111833781A
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- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The invention provides a light emitting diode circuit and a touch detection method. Firstly, a driving signal is provided, and the driving signal is used for setting at least one light emitting diode to be in a driving state or a detection state. When the light emitting diode is in a detection state, the light emitting diode receives ambient light. Then, whether the intensity of the ambient light is smaller than a first threshold is judged. When the intensity of the ambient light is smaller than the first threshold value, the position corresponding to the light emitting diode is marked as a touch position.
Description
Technical Field
The present invention relates to a touch detection circuit and method, and more particularly, to a light emitting diode circuit and a touch detection method using a light emitting diode for touch detection.
Background
With the development of semiconductor technology, the size of Light Emitting Diodes (LEDs) has reached the micron level, which can be used to display finer pictures. Therefore, many manufacturers are starting to manufacture LED displays of various sizes and use the LED displays in different electronic products. For example, the screen of a wearable device or mobile phone may use a small-sized LED display. In order to facilitate the user to use the gesture operation, manufacturers often need to additionally design a touch detection module on the screen, for example, the screen may integrate the conventional touch detection modules of capacitance type, resistance type, ultrasonic wave or infrared ray, etc. However, the above-mentioned various touch detection methods all use an additional sensing device to detect an object or a finger.
However, the additional sensing component may negatively affect the LED display, for example, affect the light extraction rate or increase the overall thickness. In addition, most of the time, the number of detection points for touch detection is limited due to cost considerations, which is not favorable for improving the touch accuracy. Therefore, a new led circuit and a touch detection method are needed to solve the above problems.
Disclosure of Invention
In view of the above, the present invention provides a light emitting diode circuit, which can perform touch detection by using the device characteristics of the light emitting diode itself. Therefore, other sensing assemblies are not needed, the manufacturing cost can be reduced, and the whole volume of the display can be reduced.
The invention provides a light emitting diode circuit which is provided with a plurality of groups of light emitting diodes, a driving module, a detecting module and a processing module. The light emitting diode groups are provided with a plurality of light emitting diodes. The driving module is coupled to the plurality of groups of light emitting diodes and is controlled by a first control signal to provide a first current path, and at least one of the plurality of light emitting diodes is in a driving state in the first current path. The detection module is coupled to the plurality of groups of light emitting diodes and is controlled by a second control signal to provide a second current path, and at least one of the plurality of light emitting diodes is in a detection state in the second current path. The processing module is coupled to the driving module and the detecting module respectively for selectively providing a first control signal or a second control signal. When at least one of the plurality of light emitting diodes is in a detection state, the detection module judges whether the intensity of the ambient light is smaller than a first threshold value, and when the intensity of the ambient light is smaller than the first threshold value, the position corresponding to the at least one of the plurality of light emitting diodes is marked as a touch position.
In some embodiments, the first control signal may correspond to a first level of the driving signal, and the second control signal may correspond to a second level of the driving signal. In addition, at least one of the plurality of light emitting diodes may be forward biased in the driving state and reverse biased in the detecting state. In addition, the detection module can further obtain a light-induced current generated by at least one of the plurality of light-emitting diodes according to the ambient light, and determine whether the light-induced current is smaller than a second threshold value. When the light-induced current is smaller than the second threshold, the detection module judges that the intensity of the ambient light is smaller than the first threshold.
The invention provides a touch detection method, which can carry out touch detection by utilizing the component characteristics of a light-emitting diode. Therefore, other sensing assemblies are not needed, the manufacturing cost can be reduced, and the whole volume of the display can be reduced.
The invention provides a touch detection method, which is used for multiple groups of light-emitting diodes, wherein the multiple groups of light-emitting diodes are provided with a plurality of light-emitting diodes. Firstly, a driving signal is provided, and the driving signal is used for setting at least one light emitting diode to be in a driving state or a detection state. When the light emitting diode is in a detection state, the light emitting diode receives ambient light. Then, whether the intensity of the ambient light is smaller than a first threshold is judged. When the intensity of the ambient light is smaller than the first threshold value, the position corresponding to the light emitting diode is marked as a touch position.
In some embodiments, the step of determining whether the intensity of the ambient light is less than the first threshold further includes the following steps. Firstly, a light-induced current is obtained, and the light-induced current is generated by the light-emitting diode according to ambient light. And then, judging whether the light-induced current is smaller than a second threshold value. When the light-induced current is smaller than the second threshold, the intensity of the ambient light is smaller than the first threshold. In addition, when the light emitting diode is in a driving state, the light emitting diode can generate emitted light, wherein the frequency spectrum of the ambient light and the frequency spectrum of the emitted light can be different.
In summary, the present invention provides a light emitting diode circuit and a touch detection method, which can be applied to multiple sets of light emitting diodes. Here, the ambient light is detected by the plurality of light emitting diodes in the plurality of groups of light emitting diodes, and when the ambient light changes, it can be determined that the touch is being performed. Therefore, other sensing assemblies are not needed, the manufacturing cost can be reduced, and the whole volume of the display can be reduced.
Other effects and embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a functional block diagram of an LED circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of an LED circuit according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a touch detection method according to an embodiment of the invention.
Description of the symbols
1 led circuit 10 led groups
100 led 12 driver module
120 drive unit 14 detection module
140 amplifier 142 detection unit
16 processing module R resistor
S1 first control Signal S2 second control Signal
M1, M2 and M3 switch VDD1 system high voltage
VDD2 system high voltage VSS system low voltage
S30-S36 Process flow
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of a preferred embodiment, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.
Referring to fig. 1, fig. 1 is a functional block diagram of a light emitting diode circuit according to an embodiment of the invention. As shown in fig. 1, the led circuit 1 includes a plurality of led groups 10, a driving module 12, a detecting module 14, and a processing module 16. The led groups 10 are respectively coupled to the driving module 12 and the detecting module 14, and the processing module 16 is also respectively coupled to the driving module 12 and the detecting module 14. In practice, the led circuit 1 may be integrated into an electronic product, for example, the led groups 10 may be used as a display screen of the electronic product, for example, a wearable device or a mobile phone.
The led multi-group 10 is a multi-group consisting of a plurality of leds 100, and the present embodiment does not limit the size of the led multi-group 10, as long as the size of the screen of the electronic product can be met, that is, the present embodiment belongs to the category of the led multi-group 10. Here, in the led groups 10, the leds 100 in the same row may be coupled to each other, and the leds 100 in the same column may also be coupled to each other, which is not limited in this embodiment. In addition, the material used for the plurality of light emitting diodes 100 is not limited in this embodiment, for example, different materials may be used for adjacent light emitting diodes 100 to emit light of different colors. In other words, the plurality of light emitting diodes 100 may include an unlimited number of red light emitting diodes, green light emitting diodes, blue light emitting diodes, white light emitting diodes, or the like. For example, gallium arsenide phosphide (GaAsP), indium gallium nitride (InGaN), gallium nitride (GaN), gallium phosphide (GaP), indium gallium aluminum phosphide (AlGaInP), or aluminum gallium phosphide (AlGaP) may be used, and in some cases, the light emitting diode 100 may also be an Organic Light Emitting Diode (OLED).
The driving module 12 is controlled by a first control signal (not shown in fig. 1) to provide a first current path, and at least one of the light emitting diodes 100 is driven by the first current path. In practice, the driving module 12 can be turned on or activated according to the first control signal, so as to provide the first current path for the light emitting diode 100. In the first current path, the voltage at the positive terminal of the led 100 is higher than the voltage at the negative terminal, and is forward biased, which defines the led 100 as being driven. In an example, the light emitting diode 100 can emit light (emit light) in the driving state, and the driving module 12 can also adjust the intensity of the light emitted by the light emitting diode 100. Of course, it should be understood by those skilled in the art that the intensity of the light emitted by each led 100 can be related to the picture to be displayed, and the embodiment is not limited herein.
The detecting module 14 is controlled by a second control signal (not shown in fig. 1) to provide a second current path, and at least one of the plurality of light emitting diodes 100 is in a detecting state in the second current path. In practice, the detecting module 14 can be turned on or activated according to the second control signal, so as to provide the second current path for the light emitting diode 100. In the second current path, the voltage at the positive terminal of the led 100 is less than or equal to the voltage at the negative terminal, and is under reverse bias, which defines the led 100 as a detection state. In one example, the led 100 can receive the ambient light in the detection state, so that the detection module 14 can determine whether the touch is touched according to the intensity of the ambient light. Here, the ambient light is to be distinguished from the light emitted by the light emitting diode 100, and the ambient light is the light entering from the outside of the light emitting diode circuit 1, such as the light of a lamp, the sunlight or the light generated by other electronic devices. In one example, it may be defined that the spectrum of ambient light is different from the spectrum of light emitted by the light emitting diode 100.
The processing module 16 is configured to provide a first control signal or a second control signal. In practice, the processing module 16 does not provide the first control signal and the second control signal at the same time. In one example, the first control signal corresponds to a first level (e.g., a high level) of the driving signal, and the second control signal corresponds to a second level (e.g., a low level) of the driving signal. Since the first control signal enables the light emitting diode 100 to operate in the driving state, the driving state of the light emitting diode 100 corresponds to the first level of the driving signal. Similarly, the second control signal enables the led 100 to operate in the detection state, i.e. the detection state of the led 100 corresponds to the second level of the driving signal. In an actual operation example, when the driving signal is at the high level, it can be regarded that the led groups 10 are in the driving state to display the frame, and when the driving signal is at the low level, it can be regarded that the led groups 10 are in the detecting state and do not display the frame.
It should be noted that, the present embodiment does not limit the first control signal and the second control signal to correspond to the high and low levels of the driving signal, and the first control signal and the second control signal may also be two independent signals, as long as the first control signal and the second control signal are not generated by the processing module 16 at the same time, which belongs to the scope of the present embodiment. For example, the second control signal may be a common interval signal (blank signal) of the display, so that during a detection period, some of the leds 100 in the led groups 10 may be set to the detection state at the same time. In addition, the embodiment does not limit the time that the light emitting diode 100 operates in the driving state and the detecting state, in one example, the time that the light emitting diode 100 operates in the detecting state may be related to a duty cycle (duty cycle) of the driving signal, and the larger the duty cycle of the driving signal, the shorter the time that the light emitting diode 100 operates in the detecting state. In addition, in a detection period, the LEDs in the multiple groups of LEDs are set to the detection state at the same time
In order to make the present invention more easily understood by those skilled in the art, please refer to fig. 1 and fig. 2, wherein fig. 2 is a circuit diagram of an led circuit according to an embodiment of the present invention. As shown, the present embodiment is exemplified by controlling one of the light emitting diodes 100 in the plurality of light emitting diode groups 10, but it can be understood by those skilled in the art that one or more light emitting diodes 100 can be actually controlled.
In the example of fig. 2, the driving module 12 may include a switch M1 and a driving unit 120. One end of the switch M1 is coupled to the system high voltage VDD1, the other end of the switch M1 is coupled to the positive terminal of the led 100, and the driving unit 120 is coupled to the negative terminal of the led 100. The switch M1 may have a control terminal that may be coupled to the processing module 16 and controlled by a first control signal S1. In practical terms, since the processing module 16 does not provide the first control signal S1 and the second control signal S2 at the same time, when the switch M1 is controlled by the first control signal S1 to be turned on, the positive terminal of the light emitting diode 100 is electrically connected to the system high voltage VDD1, and the negative terminal of the light emitting diode 100 is electrically connected to the driving unit 120. Here, the driving unit 120 may be a controllable current source, which can adjust the current flowing through the light emitting diode 100 according to different display frames, so as to achieve the purpose of adjusting the brightness of the light emitting diode 100. In one example, the first current path may be a current path from the system high voltage VDD1, through the switch M1, the light emitting diode 100, and to the driving unit 120. Since the positive terminal voltage of the led 100 is greater than the negative terminal voltage of the led 100, the led 100 is forward biased and operated in a driving state.
On the other hand, the detecting module 14 may include a switch M2, a switch M3, a resistor R, an amplifier 140 and a detecting unit 142. One end of the switch M2 is coupled to the system high voltage VDD2, and the other end of the switch M2 is coupled to the negative terminal of the led 100. One end of the switch M3 is coupled to the positive terminal of the led 100, and the other end of the switch M3 is connected in series with the resistor R and electrically connected to the system low voltage VSS. The switch M2 and the switch M3 may each have a control terminal coupled to the processing module 16 and controlled by the second control signal S2. The amplifier 140 is used for capturing a voltage difference between two ends of the resistor R and transmitting the voltage difference to the detecting unit 142. In practical terms, when the switches M2 and M3 are controlled by the second control signal S2 to be turned on, the negative terminal of the led 100 is electrically connected to the system high voltage VDD2, and the positive terminal of the led 100 is electrically connected to the system low voltage VSS. In one example, the second current path may be a current path from the system high voltage VDD2, through the switch M2, the light emitting diode 100, the switch M3, and the resistor R, to the system low voltage VSS. Since the positive terminal voltage of the led 100 is less than or equal to the negative terminal voltage of the led 100, the led 100 is reversely biased and operates in the detection state.
In practice, the light emitting diode 100 does not emit light in the detection state, but can generate a weak photo-induced current based on a photovoltaic (photovoltaic) effect under the stimulation of ambient light, i.e., the photo-induced current exists in the second current path and flows from the system high voltage VDD2 to the system low voltage VSS. In one example, the voltage difference captured at the two ends of the resistor R is the product of the photo-induced current and the resistor R, so that the magnitude of the photo-induced current can be determined by the voltage difference at the two ends of the resistor R. Since the magnitude of the photo-induced current is small, the voltage difference across the resistor R will of course also be small. Here, the amplifier 140 amplifies the voltage difference, and feeds the amplified voltage difference into the detection unit 142, so that the detection unit 142 can perform subsequent interpretation. The present embodiment does not limit the use of the amplifier 140, and if the detecting unit 142 is sensitive enough, the detecting unit 142 can directly sense the voltage difference between the two ends of the resistor R without first amplifying the voltage difference.
For the following example, the led circuit 1 is installed in a mobile phone, and the led groups 10 can be used as a screen of the mobile phone. When a user slides or presses with a finger or a stylus on the screen (the led groups 10) of the mobile phone, some of the leds 100 in the led groups 10 may not be located at the touch position of the finger or the stylus. Since the light emitting diodes 100 not located at the touch position are not shielded, the ambient light can be received without being affected. On the contrary, another part of the light emitting diodes 100 may be located right around the touch position of the finger or the touch pen, and since the finger or the touch pen covers or shields the light emitting diodes 100 around the touch position, the light emitting diodes 100 are not easy to receive the ambient light, so that the ambient light received by the light emitting diodes 100 is significantly reduced. At this time, since the leds 100 around the touch position of the finger or the stylus are not stimulated by enough ambient light, the generated photo-induced current is also significantly reduced.
Since the resistance of the resistor R is known, the detecting unit 142 can calculate the photo-induced current value corresponding to the light emitting diode 100 by detecting the voltage difference between the two ends of the resistor R. Therefore, the detecting unit 142 can determine whether the photo-induced current is smaller than the second threshold. When the detecting unit 142 determines that the photo-induced current is smaller than the second threshold, it can be known that the light emitting diode 100 at the corresponding position is shielded by a finger or a touch pen, and the position corresponding to the light emitting diode 100 can be marked as the touch position of the finger or the touch pen. On the contrary, when the detecting unit 142 determines that the photo-induced current is not less than the second threshold, it can be known that the light emitting diode 100 at the corresponding position is not shielded, and the position corresponding to the light emitting diode 100 is not the touch position of the finger or the stylus. On the other hand, since the light-induced current and the intensity of the ambient light have a corresponding relationship, when the detecting unit 142 determines that the light-induced current is smaller than the second threshold, the intensity of the ambient light can also be converted to be smaller than a brightness threshold (the first threshold).
In practice, the detecting unit 142 may also determine whether the photo-induced current is smaller than the second threshold, for example, the detecting unit 142 may determine whether the photo-induced current is smaller than a third threshold, and the third threshold is larger than the second threshold. Therefore, the detecting unit 142 can obtain more information about the touch. For example, a light emitting diode 100 directly covered by a finger or a touch panel hardly generates a photo-induced current, and the detecting unit 142 can almost determine the position of the light emitting diode 100 as a touch position. However, if a finger or a stylus is only suspended above or around one of the light emitting diodes 100, such that the light emitting diode 100 is in the shadow of the finger or the stylus, the detecting unit 142 does not necessarily consider the position of the light emitting diode 100 as the touch position. The reason is that the light emitting diode 100, which is located in the shadow of a finger or stylus, receives ambient light, thereby generating a photo-induced current. Except that the led 100 receives less ambient light and may generate less light-induced current than if the other leds 100 were not shielded at all.
In other words, by setting the second threshold and the third threshold properly, it can be distinguished which light emitting diode 100 is directly covered by a finger or a touch pad, and which light emitting diode 100 is located in the shadow of the finger or the touch pad. Therefore, the condition of misjudging the touch points can be reduced. In addition, the number of the detecting modules 14 connected to the light emitting diodes 100 is not necessarily equal to the number of all the light emitting diodes 100 in the plurality of sets 10 of light emitting diodes. As electronic products require higher and higher screen resolution, the spacing between the leds is often much smaller than the contact area of a finger or stylus. Therefore, in one example, the led groups 10 can also be divided into a plurality of touch detection areas, and a small number of leds 100 are selected to connect to the detection module 14 in each touch detection area. Of course, the detecting module 14 can also be connected to all the leds 100 in the led groups 10, which is not excluded in the present embodiment.
For describing the touch detection method of the present invention, please refer to fig. 1, fig. 2 and fig. 3, wherein fig. 3 is a flowchart illustrating steps of the touch detection method according to an embodiment of the present invention. As shown in step S30, the processing module 16 can provide driving signals corresponding to the first control signal S1 and the second control signal S2 respectively for setting the at least one led 100 to be in a driving state or a detecting state. In step S32, when the led 100 is in the detection state, the led 100 receives ambient light. In step S34, the detecting module 14 can determine whether the intensity of the ambient light received by the light emitting diode 100 is less than a first threshold. In step S36, when the detecting module 14 determines that the intensity of the ambient light is smaller than the first threshold, the position corresponding to the light emitting diode 100 is designated as a touch position. The present embodiment is convenient for the reader to correspond to and read, and the details have been described in the previous embodiment and are not repeated herein.
In summary, the present invention provides a light emitting diode circuit and a touch detection method, which can be applied to multiple sets of light emitting diodes. The plurality of light emitting diodes in the plurality of groups of light emitting diodes receive the ambient light, so that the detection module can judge whether the light emitting diodes at the specific positions are touched or not through the change of the ambient light. Therefore, other sensing assemblies are not needed, the manufacturing cost can be reduced, and the whole volume of the display can be reduced.
The above-described embodiments and/or implementations are only for illustrating the preferred embodiments and/or implementations of the present technology, and are not intended to limit the implementations of the present technology in any way, and those skilled in the art can make many modifications or changes without departing from the scope of the technology disclosed in the present disclosure, but should be construed as technology or implementations that are substantially the same as the present technology.
Claims (11)
1. A touch detection method is used for a plurality of groups of light emitting diodes, and the plurality of groups of light emitting diodes are provided with a plurality of light emitting diodes, and the touch detection method is characterized by comprising the following steps:
providing a driving signal, wherein the driving signal is used for setting at least one light-emitting diode to be in a driving state or a detecting state;
when at least one light emitting diode is in the detection state, at least one light emitting diode receives ambient light;
judging whether the intensity of the ambient light is less than a first threshold value; and
when the intensity of the ambient light is smaller than the first threshold, the position corresponding to at least one light emitting diode is marked as a touch position.
2. The touch detection method of claim 1, wherein the driving state corresponds to a first level of the driving signal, and the detection state corresponds to a second level of the driving signal.
3. The method of claim 1, wherein the step of determining whether the intensity of the ambient light is less than the first threshold further comprises:
obtaining a light-induced current, wherein the light-induced current is generated by at least one light-emitting diode according to the ambient light; and
judging whether the light-induced current is smaller than a second threshold value;
when the light-induced current is smaller than the second threshold, the intensity of the ambient light is smaller than the first threshold.
4. The touch detection method of claim 1, further comprising:
when at least one light emitting diode is in the driving state, at least one light emitting diode generates an emitting light.
5. The touch detection method of claim 4, wherein the frequency spectrum of the ambient light is different from the frequency spectrum of the emitted light.
6. The touch detection method of claim 4, further comprising:
in a detection period, the LEDs in the plurality of groups of LEDs are set to be in the detection state at the same time.
7. A light emitting diode circuit, comprising:
a plurality of groups of light emitting diodes, which are provided with a plurality of light emitting diodes;
a driving module, coupled to the plurality of groups of light emitting diodes, controlled by a first control signal to provide a first current path, wherein at least one of the light emitting diodes is in a driving state in the first current path;
a detection module, coupled to the plurality of sets of light emitting diodes, controlled by a second control signal to provide a second current path, wherein at least one of the light emitting diodes is in a detection state in the second current path; and
a processing module, coupled to the driving module and the detecting module, for selectively providing the first control signal or the second control signal;
when at least one of the light emitting diodes is in the detection state, the detection module judges whether the intensity of ambient light is smaller than a first threshold value, and when the intensity of the ambient light is smaller than the first threshold value, the position corresponding to the at least one of the light emitting diodes is marked as a touch position.
8. The light emitting diode circuit of claim 7, wherein the first control signal corresponds to a first level of a driving signal, and the second control signal corresponds to a second level of the driving signal.
9. The LED circuit of claim 7, wherein at least one of the LEDs is forward biased in the driving state and reverse biased in the detecting state.
10. The led circuit of claim 7, wherein the detecting module further obtains a light-induced current generated by at least one of the leds according to the ambient light, and determines whether the light-induced current is less than a second threshold.
11. The led circuit of claim 10, wherein the detecting module determines that the intensity of the ambient light is less than the first threshold when the photo-induced current is less than the second threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910247545.5A CN111833781A (en) | 2019-03-29 | 2019-03-29 | Light emitting diode circuit and touch detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910247545.5A CN111833781A (en) | 2019-03-29 | 2019-03-29 | Light emitting diode circuit and touch detection method |
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Application publication date: 20201027 |