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Proximity sensor with a sliced integration time sensing mechanism and sensing method thereof

Active Publication Date: 2021-06-17
ANPEC ELECTRONICS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent provides a proximity sensor with a mechanism that divides the integration time (the time it takes for the sensor to collect light signals) into multiple phases. During each phase, the sensor only receives light signals from the reflected sensing light and ambient light. By canceling out the brightness of the ambient light during multiple phases, the sensor can accurately measure the brightness of the reflected light. This technology allows for more precise and accurate sensing.

Problems solved by technology

When a user makes a call, a face of the user may easily touch the touch screen of the cell phone to inadvertently trigger the cell phone to perform an operation.

Method used

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  • Proximity sensor with a sliced integration time sensing mechanism and sensing method thereof
  • Proximity sensor with a sliced integration time sensing mechanism and sensing method thereof
  • Proximity sensor with a sliced integration time sensing mechanism and sensing method thereof

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Experimental program
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first embodiment

[0042]Reference is made to FIGS. 1 to 3, wherein FIG. 3 is a waveform diagram of an integration time signal and a light emitting signal of the proximity sensor with the sliced integration time sensing mechanism according to the present disclosure.

[0043]A brightness of the sensing light emitted by the light transmitter TX and a brightness of an ambient light may change over an integration time during working periods of waveforms of an integration time signal PSIT. In the embodiment, the integration time is divided into a plurality of phase times. For example, as shown in FIG. 3, the integration time is divided into two phase times. That is, the plurality of phase times divided from the integration time may include a first phase time Φ1 and a second phase time Φ2, but the present disclosure is not limited thereto.

[0044]As shown in FIG. 3, a light emitting signal VCSEL is at a high level during the first phase time Φ1, which indicates that the light transmitter TX emits the sensing lig...

fifth embodiment

[0070]Reference is made to FIGS. 7A and 7B, wherein FIG. 7A is a schematic diagram of waveforms of an integration time signal and a light emitting signal of a proximity sensor with a sliced integration time sensing mechanism and a curve of a light signal versus time according to the present disclosure, and FIG. 7B is a schematic diagram of a second integrated brightness area subtracted from a first integrated brightness area of FIG. 7A.

fourth embodiment

[0071]In comparison with a two-phase cancellation manner applied in the fourth embodiment shown in FIGS. 6A and 6B, a three-phase cancellation manner is applied in the embodiment shown in FIGS. 7A and 7B to more effectively eliminate the brightness of the ambient light, which is described specifically as follows.

[0072]As shown in FIG. 7A, the integration time signal PSIT is divided into the first phase time Φ1, the second phase time Φ2 and a third phase time Φ3. In the embodiment, a sum of the time length of the first phase time Φ1 and a time length of the third phase time Φ3 is equal to the time length IT of the second phase time Φ2. That is, the time length of the first phase time Φ1 is half the time length IT of the second phase time Φ2, and the time length of the third phase time Φ3 is half the time length IT of the second phase time Φ2.

[0073]As shown in FIG. 7A, the brightness of the light signal received by the light receiver increases over time to form the curve in a curve di...

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Abstract

A proximity sensor with a sliced integration time sensing mechanism and a sensing method thereof are provided. A light transmitter emits a sensing light toward a detected object during a first phase time. A light receiver receives a first light signal formed by the sensing light reflected by the detected object and an ambient light during the first phase time, and receives a second light signal of the ambient light during a second phase time. A first brightness of the first light signal is integrated over the first phase time to form a first integrated brightness value. A second brightness of the second light signal is integrated over the second phase time to form a second integrated brightness value. The light receiver subtracts the second integrated brightness value from the first integrated brightness value to obtain a first integrated brightness correction value by phase cancellation.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATION[0001]This application claims the benefit of priority to Taiwan Patent Application No. 108145210, filed on Dec. 11, 2019 in People's Republic of China. The entire content of the above identified application is incorporated herein by reference.[0002]Some references, which may include patents, patent applications and various publications, may be cited and discussed in the description of this disclosure. The citation and / or discussion of such references is provided merely to clarify the description of the present disclosure and is not an admission that any such reference is “prior art” to the disclosure described herein. All references cited and discussed in this specification are incorporated herein by reference in their entireties and to the same extent as if each reference was individually incorporated by reference.FIELD OF THE DISCLOSURE[0003]The present disclosure relates to a proximity sensor, and more particularly to a proximity senso...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H05B47/11H05B47/195
CPCH05B47/11H01S5/183H05B47/195G06F3/011Y02B20/40G01S7/4876G01S17/04
Inventor HUANG, YI-JUNGCHEN, JING-MINCHEN, CHIH-NING
Owner ANPEC ELECTRONICS CORPORATION