Light sensing method having sensing order adjusting mechanism

Patent metadata

Field	Value
Publication number	US-12253409-B2
Application number	US-202217950217-A
Country	US
Kind code	B2
Filing date	Sep 22, 2022
Priority date	Jul 27, 2022
Publication date	Mar 18, 2025
Grant date	Mar 18, 2025

Abstract

A light sensing method having a sensing order adjusting mechanism is provided. The method includes steps of: in a previous sensing cycle, sensing a first light signal that is emitted by both of an ambient light source and a light-emitting component and then is reflected by a tested object; in the previous sensing cycle, sensing a second light signal that is emitted by both of the ambient light source and the light-emitting component and then is reflected by the tested object; in the previous sensing cycle, sensing an ambient light signal emitted by only the ambient light source; and in a next sensing cycle, sensing the first light signal, the second light signal and the ambient light signal in an order different from that in the previous sensing cycle.

First claim

What is claimed is:

1. A light sensing method having a sensing order adjusting mechanism, comprising the following processes:
performing a first light sensing operation to sense a first reflected light signal within a first phase time included in each of a plurality of sensing cycles, wherein [the] a first light signal is reflected by a tested object to form the first reflected light signal;
counting a first coarse count value according to the first reflected light signal within the first phase time of each of the plurality of sensing cycles;
performing a fine counting operation on the first coarse count value to output a first fine count value within the first phase time of each of the plurality of sensing cycles;
performing a second light sensing operation to sense a second reflected light signal within a second phase time included in each of the plurality of sensing cycles, wherein a second light signal is reflected by the tested object to form the second reflected light signal;
counting a second coarse count value according to the second reflected light signal within the second phase time of each of the plurality of sensing cycles;
performing the fine counting operation on the second coarse count value to output a second fine count value within the second phase time of each of the plurality of sensing cycles;
turning off the light-emitting component during a third phase time included in each of the plurality of sensing cycles;
performing an ambient light sensing operation to sense a first ambient light signal within the third phase time of each of the plurality of sensing cycles;
counting a third coarse count value according to the first ambient light signal within the third phase time of each of the plurality of sensing cycles;
performing the fine counting operation on the third coarse count value to output a third fine count value within the third phase time of each of the plurality of sensing cycles; and
sequentially performing the plurality of sensing cycles, wherein an order of performing the first light sensing operation, the second light sensing operation and the ambient light sensing operation in a next one of the plurality of sensing cycles is different from that in a previous one of the plurality of sensing cycles.

2. The light sensing method according to claim 1 , further comprising the following process:
sensing the first reflected light signal and the second reflected light signal respectively at different positions.

3. The light sensing method according to claim 1 , further comprising the following process:
in any one of the plurality of sensing cycles, sequentially performing the first light sensing operation, the second light sensing operation and the ambient light sensing operation.

4. The light sensing method according to claim 3 , further comprising the following process:
in the previous one or the next one of the plurality of sensing cycles, sequentially performing the first light sensing operation, the ambient light sensing operation and the second light sensing operation.

5. The light sensing method according to claim 3 , further comprising the following process:
in the previous one or the next one of the plurality of sensing cycles, sequentially performing the second light sensing operation, the first light sensing operation and the ambient light sensing operation.

6. The light sensing method according to claim 3 , further comprising the following process:
in the previous one or the next one of the plurality of sensing cycles, sequentially performing the second light sensing operation, the ambient light sensing operation and the first light sensing operation.

7. The light sensing method according to claim 3 , further comprising the following process:
in the previous one or the next one of the plurality of sensing cycles, sequentially performing the ambient light sensing operation, the first light sensing operation and the second light sensing operation.

8. The light sensing method according to claim 3 , further comprising the following process:
in the previous one or the next one of the plurality of sensing cycles, sequentially performing the ambient light sensing operation, the second light sensing operation and the first light sensing operation.

9. The light sensing method according to claim 1 , further comprising the following processes:
performing a first ambient light sensing operation to sense the first ambient light signal within a first sub-phase time included in the third phase time of each of the plurality of sensing cycles;
performing a second ambient light sensing operation to sense a second ambient light signal within a second sub-phase time included in the third phase time; and
counting a fourth coarse count value according to the second ambient light signal within the second sub-phase time of the third phase time of each of the plurality of sensing cycles; and
performing the fine counting operation on the fourth coarse count value to output a fourth fine count value within the second sub-phase time of the third phase time of each of the plurality of sensing cycles.

10. The light sensing method according to claim 9 , further comprising the following process:
in each of the plurality of sensing cycles, performing the first light sensing operation, the second light sensing operation, the first ambient light sensing operation and the second ambient light sensing operation once;
wherein an order of performing the first light sensing operation, the second light sensing operation, the first ambient light sensing operation and the second ambient light sensing operation in the next one of the plurality of sensing cycles is different from that in the previous one of the plurality of sensing cycles.

Assignees

• Anpec Electronics Corp

Inventors

• Chen Yu-Yu
• Hong Jia-Hua
• Chen Chih-Yuan

Classifications

• G01J2001/1668

  the measuring signal itself varying in time, e.g. periodic, for example blood pulsation · CPC title

• G01J1/08

  Arrangements of light sources specially adapted for photometry {standard sources, also using luminescent or radioactive material} · CPC title

• G01J2001/083

  Testing response of detector · CPC title

• G01J1/4204

  with determination of ambient light (solar light G01J2001/4266) · CPC title

• G01S7/4863

  Detector arrays, e.g. charge-transfer gates · CPC title