Light detection device and operation method thereof
阅读说明:本技术 光检测装置以及其操作方法 (Light detection device and operation method thereof ) 是由 吴智濠 于 2018-08-21 设计创作,主要内容包括:本发明提供一种光检测装置与光检测装置的操作方法。光检测装置包括第一闸极线、第二闸极线、第一开关元件、第二开关元件以及读取电路。第二闸极线与第一闸极线相邻设置。第一开关元件包括第一闸极与第一闸极线连接、第一源极以及第一汲极与一感光元件电性连接。第二开关元件包括第二闸极与第二闸极线连接、第二源极以及第二汲极与一感光元件电性连接。读取电路与第一源极以及第二源极电性连接。光检测装置的操作方法包括进行自动侦测模式。自动侦测模式包括以读取电路自第一开关元件以及第二开关元件分别接收第一读取信号以及第二读取信号,以及计算第一读取信号与第二读取信号之间的差值以判断光检测装置是否被检测光线照射。(The invention provides a light detection device and an operation method thereof. The photo detection device includes a first gate line, a second gate line, a first switching element, a second switching element, and a read circuit. The second gate line is disposed adjacent to the first gate line. The first switch device includes a first gate connected to the first gate line, a first source and a first drain electrically connected to a photosensitive device. The second switch device includes a second gate connected to the second gate line, a second source and a second drain electrically connected to a photosensitive device. The reading circuit is electrically connected with the first source electrode and the second source electrode. The operation method of the light detection device comprises an automatic detection mode. The automatic detection mode includes that the reading circuit receives a first reading signal and a second reading signal from the first switch element and the second switch element respectively, and calculates a difference value between the first reading signal and the second reading signal to judge whether the light detection device is irradiated by the detected light.)
1. A light detection device, comprising:
a first gate line;
a first switching element comprising:
a first gate connected to the first gate line; and
a first drain electrode;
a second gate line disposed adjacent to the first gate line;
a second switching element comprising:
a second gate electrode connected to the second gate line; and
a second drain electrode;
a first photosensitive element electrically connected to the first drain and the second drain; and
a gate driving circuit electrically connected to the first gate line and the second gate line.
2. A light detecting device as in claim 1, wherein the first switching element, the second switching element and the first light sensing element are disposed in a same pixel region.
3. A light detecting device as defined in claim 1, further comprising:
and the second switch element and the second photosensitive element are arranged in a second pixel area adjacent to the first pixel area, and the second switch element is electrically separated from the second photosensitive element.
4. A light detection device, comprising:
a first photosensitive element arranged in a first pixel region;
a first switching element comprising:
a first source electrode; and
a first drain electrically connected to the first photosensitive element;
a second photosensitive element arranged in a second pixel region;
a second switching element comprising:
a second source electrode; and
a second drain electrically connected to the second photosensitive element; and
and the reading circuit is electrically connected with the first source electrode and the second source electrode and is used for receiving a first reading signal generated by the first photosensitive element and a second reading signal generated by the second photosensitive element and comparing the difference between the first reading signal and the second reading signal to judge whether the light detection device is irradiated by the detected light.
5. A light detecting device as defined in claim 4, further comprising:
a light-shielding pattern covering the second photosensitive element.
6. A light detecting device as defined in claim 4, further comprising:
a first bias line partially disposed in the first pixel region, wherein the first photosensitive element is electrically connected to the first bias line; and
and a second bias line partially disposed in the second pixel region, wherein the second photosensitive element is electrically separated from the second bias line.
7. A method of operating a light detection device, comprising:
providing a light detection device comprising:
a first gate line;
a first switching element comprising:
a first gate connected to the first gate line;
a first source electrode; and
a first drain electrically connected to a photosensitive element;
a second gate line disposed adjacent to the first gate line;
a second switching element comprising:
a second gate electrode connected to the second gate line;
a second source electrode; and
a second drain electrically connected to a photosensitive element; and
a reading circuit electrically connected to the first source and the second source; and
performing an auto-detect mode, comprising:
receiving a first reading signal and a second reading signal from the first switch element and the second switch element respectively by the reading circuit; and
and calculating the difference value between the first reading signal and the second reading signal to judge whether the light detection device is irradiated by the detection light.
8. The method of operating a light detection arrangement of claim 7, further comprising:
if the automatic detection mode determines that the light detection device is irradiated by the detection light, the automatic detection mode is stopped and an image capturing mode is performed.
9. The method as claimed in claim 7, wherein the light detecting device is determined to be illuminated by the detecting light if the difference between the first reading signal and the second reading signal is greater than a predetermined threshold.
10. The method as claimed in claim 7, wherein the auto-detection mode further comprises:
transmitting a first gate signal to the first switching element through the first gate line for turning on the first switching element and receiving the first read signal; and
transmitting a second gate signal to the second switching element through the second gate line for turning on the second switching element and receiving the second read signal, wherein the timing of the first gate signal is different from the timing of the second gate signal.
Technical Field
The present invention relates to an optical detection device and an operating method thereof, and more particularly, to an optical detection device capable of performing an automatic detection mode and an operating method thereof.
Background
The light sensing technology has been applied to many electronic products and detection equipment as the technology advances, and the light sensing technology capable of detecting X-rays is one of the most interesting applications. Because of the advantages of low radiation dose, fast imaging of electronic images, easy inspection, reproduction, capture, transmission and analysis of images, digital detection devices have gradually replaced the traditional way of detecting X-rays by negative films and become the current trend of digital medical image development. The digital light detecting device usually uses a photodiode as its light sensing element to detect the energy of X-rays. Generally, the digital light detection device still needs to be in signal connection with the X-ray generation device for synchronization, so as to perform image capturing by the digital light detection device when the X-ray is irradiated. However, whether the digital light detecting device and the X-ray generating device are connected by wire or wirelessly, the use of the digital light detecting device is limited and the synchronization signal may be interfered.
Disclosure of Invention
An objective of the present invention is to provide a photo detection device and an operating method thereof, wherein the photo detection device performs an automatic detection mode to calculate a difference between reading signals obtained through different switch elements, so as to determine whether the photo detection device is irradiated by a detection light and determine whether an image capturing mode is required.
An embodiment of the invention provides a photo detection device, which includes a first gate line, a second gate line, a first switch element, a second switch element, a first photosensitive element, and a gate driving circuit. The second gate line is disposed adjacent to the first gate line. The first switch device includes a first gate and a first drain. The first gate is connected to the first gate line. The second switch device includes a second gate and a second drain. The second gate is connected to the second gate line. The first photosensitive element is electrically connected to the first drain and the second drain. The gate driving circuit is electrically connected to the first gate line and the second gate line.
Another embodiment of the present invention provides a photo detection device, which includes a first photosensitive element, a second photosensitive element, a first switch element, a second switch element, and a reading circuit. The first photosensitive element is arranged in the first pixel area, and the second photosensitive element is arranged in the second pixel area. The first switch device includes a first source and a first drain, and the second switch device includes a second source and a second drain. The first drain is electrically connected to the first photosensitive element, and the second drain is electrically connected to the second photosensitive element. The reading circuit is electrically connected with the first source electrode and the second source electrode and used for receiving a first reading signal generated by the first photosensitive element and a second reading signal generated by the second photosensitive element and comparing the difference between the first reading signal and the second reading signal to judge whether the light detection device is irradiated by the detected light.
Another embodiment of the present invention provides a method for operating a light detection device, which includes the following steps. First, a photo-detecting device is provided. The photo detection device includes a first gate line, a second gate line, a first switching element, a second switching element, and a read circuit. The second gate line is disposed adjacent to the first gate line. The first switch device includes a first gate, a first source and a first drain. The first gate is connected to the first gate line, and the first drain is electrically connected to a photosensitive device. The second switch device includes a second gate, a second source and a second drain. The second gate is connected to the second gate line, and the second drain is electrically connected to a photosensitive device. The reading circuit is electrically connected with the first source electrode and the second source electrode. Then, an auto-detection mode is performed. The automatic detection mode includes that the reading circuit receives a first reading signal and a second reading signal from the first switch element and the second switch element respectively, and calculates a difference value between the first reading signal and the second reading signal to judge whether the light detection device is irradiated by the detected light.
Drawings
FIG. 1 is a flow chart of a method for operating a photodetection device according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of a photodetection device according to a first embodiment of the present invention.
FIG. 3 is a timing diagram illustrating an operation method of the light detecting device according to the first embodiment of the present invention.
FIG. 4 is a schematic diagram of a photodetection device according to a second embodiment of the present invention.
FIG. 5 is a timing diagram illustrating an operation method of a photodetection device according to a second embodiment of the present invention.
FIG. 6 is a schematic diagram of a photodetection device according to a third embodiment of the present invention.
FIG. 7 is a cross-sectional view of a first pixel region of a photodetection device according to a third embodiment of the present invention.
FIG. 8 is a schematic top view of a first pixel region of a light detecting device according to a third embodiment of the present invention.
FIG. 9 is a schematic cross-sectional view of a second pixel region of a photodetection device according to a third embodiment of the invention.
FIG. 10 is a schematic top view of a second pixel region of a light detecting device according to a third embodiment of the present invention.
FIG. 11 is a schematic view of a photodetection device according to a fourth embodiment of the present invention.
Description of reference numerals: 10-a substrate; 21-a gate dielectric layer; 22-a semiconductor channel layer; 31-a first dielectric layer; 32-a second dielectric layer; 33-a third dielectric layer; 40-a lower electrode; a 51-N type semiconductor layer; 52-intrinsic semiconductor layer; a 53-P type semiconductor layer; 60-an upper electrode; 91-a gate driving circuit; 92-a read circuit; 101-104-a light detection device; BL-bias line; BL1 — first bias line; BL2 — second bias line; DE 1-first drain; DE 2-second drain; DE 3-third drain; a DL-data line; GE 1-the first gate; GE 2-second gate; GE 3-third gate; GL 1-a first gate line; GL 2-second gate line; GL 3-third gate line; gn-gate signal; gn + 1-gate signal; gn + 2-gate signal; gn + 3-gate signal; gn + 4-gate signal; gn + 5-gate signal; g' n-gate signal; g' n + 1-gate signal; o1-open pore; o2-open pore; a PD-photosensitive element; PD1 — first photosensitive element; PD2 — second photosensitive element; a PX-pixel region; PX 1-first pixel area; PX 2-second pixel area; rn-read signal; rn + 1-read signal; rn + 2-read signal; rn + 3-read signal; rn + 4-read signal; rn + 5-read signal; r' n-read signal; r' n + 1-read signal; ROIC-read integrated circuit; s10-step; s20-step; s21-step; s22-step; s30-step; s40-step; SE1 — first source; SE2 — second source; SE 3-third source; SP-light blocking pattern; t1 — first switching element; t2 — second switching element; t3 — third switching element; XR-detected light; z-thickness direction.
Detailed Description
In order to make those skilled in the art to which the invention pertains understand the present invention, the following embodiments of the present invention are specifically illustrated in the accompanying drawings, and the detailed description of the constituents and intended effects of the invention will be given. These examples are not intended to limit the invention. Furthermore, it will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, regions, steps, operations, and/or elements, but do not preclude the presence or addition of one or more other features, regions, steps, operations, elements, and/or groups thereof. It will be understood that when an element such as a layer or region is referred to as being "on" or extending "onto" another element (or variations thereof), it can be directly on or extend directly onto the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or extending "directly onto" another element (or variations thereof), there are no intervening elements present. It will also be understood that when an element is referred to as being "connected" to another element (or variations thereof), it can be directly connected to the other element or be indirectly connected (e.g., electrically connected) to the other element through one or more other elements. It is also to be understood that features inventive in various embodiments of the present invention can be rearranged with respect to each other to form yet another embodiment.
Please refer to fig. 1, fig. 2 and fig. 3. Fig. 1 is a flowchart illustrating an operation method of a photodetection device according to a first embodiment of the present invention, fig. 2 is a schematic diagram illustrating the photodetection device according to the present embodiment, and fig. 3 is a timing diagram illustrating the operation method of the photodetection device according to the present embodiment. As shown in fig. 1 and fig. 2, the present embodiment provides a method for operating a light detection device, which includes the following steps. First, step S10 is performed to provide the photodetection device 101, and turn on the photodetection device 101. The photo detection device 101 may include a first gate line GL1, a second gate line GL2, a first switching element T1 and a second switching element T2. The first switch element T1 may include a first gate GE1, a first drain DE1 and a first source SE1, and the second switch element T2 may include a second gate GE2, a second drain DE2 and a
In some embodiments, the second gate line GL2 may be disposed adjacent to the first gate line GL1, the first gate electrode GE1 of the first switching element T1 may be connected to the first gate line GL1, and the second gate electrode GE2 of the second switching element T2 may be connected to the second
As shown in fig. 2, the photo detection device 101 may further include a plurality of third gate lines GL3 and third switching elements T3 connected to the third
As shown in fig. 1, 2 and 3, the auto-detect mode (i.e., step S20 shown in fig. 1) is performed after step S10. In some embodiments, step S20 is performed automatically after step S10. In some embodiments, the standby mode is entered after step S10, and the user determines when to perform step S20, or sets a predetermined time before performing step S20. The auto-detect mode may include steps S21 and S22 shown in fig. 1. In step S21, the
In other words, a first gate signal (e.g., the gate signal G 'n) may be transmitted to the first switch element T1 through the first gate line GL1 for turning on the first switch element T1 and receiving a first read signal (e.g., the read signal R' n), and a second gate signal (e.g., the gate signal G 'n +1) may be transmitted to the second switch element T2 through the second gate line GL2 for turning on the second switch element T2 and receiving a second read signal (e.g., the read signal R' n + 1). In addition, the timing of the first gate signal (e.g., the gate signal G 'n) may be different from the timing of the second gate signal (e.g., the gate signal G' n + 1). Since the first gate line GL1 and the second gate line GL2 are respectively connected to the first gate GE1 and the second gate GE2, and the first drain DE1 and the second drain DE2 are electrically connected to the first photo sensor PD1 at the same time, when the light detection device 101 is irradiated by the detection light XR, the gate signal G 'n can turn on the first switch element T1 to enable the photo-electric conversion change generated by the first photo sensor PD1 under the irradiation of the detection light XR to pass through the first switch element T1 and the data line DL to be read by the read integrated circuit ROIC to become a first read signal (e.g., a read signal R' n). Then, after the read signal R ' n is read, the second switch device T2 can be turned on by the gate signal G ' n +1 and a second read signal (e.g., the read signal R ' n +1) can be read by the read integrated circuit ROIC.
The photosensitive element PD photoelectrically converts the received detection light XR, but the photosensitive element PD needs a certain illumination time in order to make the intensity of the read signal meet the detection requirement. The read signal R ' n +1 can be closer to a simple background signal (background signal) by giving the gate signal G ' n +1 to the second switch device T2 later than the gate signal G ' n to the first switch device T1, and controlling the timing difference between the gate signal G ' n and the gate signal G ' n +1 to be shorter than the illumination time required by the photo sensor PD to meet the detection requirement. In some embodiments, the background signal may be from an unexpected shock or background radiation present in the space, but not limited thereto. Therefore, when the difference between the first readout signal (e.g., the readout signal R 'n) and the second readout signal (e.g., the readout signal R' n +1) is greater than a predetermined threshold, it can be determined that the light detection device 101 is irradiated by the detection light XR. Conversely, if the difference between the first reading signal and the second reading signal is not greater than the predetermined threshold, it is determined that the light detecting device 101 is not irradiated by the detecting light XR. In the above-mentioned operation method, since the timing difference between the gate signal G ' n and the gate signal G ' n +1 needs to be controlled so that the read signal R ' n +1 can be closer to the background signal, the first gate line GL1 and the second gate line GL2 are preferably electrically connected to the same
The following description will mainly describe different parts of each embodiment, and in order to simplify the description, the description will not repeat the description of the same parts. In addition, the same elements in the embodiments of the present invention are denoted by the same reference numerals to facilitate comparison between the embodiments.
Please refer to fig. 4 and fig. 5. FIG. 4 is a schematic diagram of a
Please refer to fig. 6, fig. 7, fig. 8, fig. 9 and fig. 10. Fig. 6 is a schematic diagram of a
In some embodiments, as shown in fig. 6, 7, 8, 9 and 10, the
Please refer to fig. 11. Fig. 11 is a schematic diagram of a photodetection device 104 according to a fourth embodiment of the present invention. As shown in fig. 11, the difference from the third embodiment described above is that the second photosensitive element PD2 of the present embodiment is electrically separable from the second
In summary, in the optical detection device and the operating method thereof of the present invention, the optical detection device can be used to perform an automatic detection mode to calculate the difference between the reading signals obtained through different switch elements, so as to determine whether the optical detection device is irradiated by the detected light and determine whether an image capturing mode is required. Therefore, the light detection device and the detection light generating device (such as an X-ray generating device) of the invention do not need to be synchronized in an online manner, so that the effect of simplifying the detection device and the detection operation can be achieved.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.