CN112698755B - Light sensing signal reading method and light sensing device - Google Patents
Light sensing signal reading method and light sensing device Download PDFInfo
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- CN112698755B CN112698755B CN202110049441.0A CN202110049441A CN112698755B CN 112698755 B CN112698755 B CN 112698755B CN 202110049441 A CN202110049441 A CN 202110049441A CN 112698755 B CN112698755 B CN 112698755B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04164—Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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Abstract
The embodiment of the application discloses a method and a device for reading light sensing signals, wherein the device comprises a plurality of rows of light sensing units, a driving unit and a reading unit, and the plurality of rows of light sensing units are electrically connected with the driving unit and the reading unit; each adjacent M rows of light sensing units in the plurality of rows of light sensing units are combined into a light sensing unit group, and M is an integer greater than or equal to 2; the reading method comprises the following steps: the driving unit is used for controlling the multi-row light sensing units to output light sensing signals row by row; sequentially reading the light sensing signals output by each light sensing unit group through a reading unit; the time for reading the light sensing signals output by the M rows of light sensing units in one light sensing unit group is taken as a row reading period, and the light sensing signals output by the M rows of light sensing units are sequentially read by the reading unit in the row reading period. The method and the device can prolong the row reading period of the reading unit, thereby reducing the reading speed of the reading unit and reducing the cost of the reading unit.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a method for reading a light sensing signal and a light sensing device.
Background
Integrating light sensing performance in a display panel can bring about a more varied and more convenient user experience. FIG. 1 is a schematic diagram of an exemplary 2T1C photo-sensing circuit. Taking a 2T1C photo-sensing circuit as an example, the process of generating and reading photo-sensing signals of the photo-sensing units integrated in the display panel is described. As shown in fig. 1, the photo sensing circuit includes a photo sensing thin film transistor M1, a storage capacitor Cst, a switching thin film transistor M2, and a read integrated circuit (ROIC). The gate and the drain of the light-sensitive thin film transistor M1 are respectively connected to the dc voltages SVGG and SVDD, so that the thin film transistor M1 is in a continuous light-sensitive state. The higher the light intensity is, the larger the leakage current is, and the more photo-induced charges (photo-induced signals) are accumulated in the storage capacitor Cst, so that the conversion from the optical signals to the electrical signals is realized. The switch thin film transistor M2 is periodically turned on, that is, the photo-induced charges in the storage capacitor Cst are periodically released, enter a corresponding channel of the ROIC through the read signal line to be collected and processed, and then the photo-induced signals are presented on the display screen through a series of subsequent processes. For example, when a laser spot is projected onto the display panel, the light sensing unit covered by the laser spot generates more light sensing charges, and the display screen can display clicking, drawing and other actions at the position of the light sensing unit through subsequent processes such as signal transmission, processing, rendering and the like.
However, integrating the photo sensor unit into the display panel has many technical challenges, such as matching the readout of the photo sensor signal with the display timing, which is one of the challenges. When the photo-sensing function is to be matched with a display panel with high resolution and high refresh rate, the read rate of the photo-sensing signal needs to be fast enough, but at the same time, the cost of the ROIC is greatly increased.
Disclosure of Invention
The application provides a light sensing signal reading method and a light sensing device, which can prolong the row reading period of a reading unit, thereby reducing the reading rate of the reading unit and reducing the cost of the reading unit.
The application provides a method for reading a light sensing signal, which is applied to a light sensing device, wherein the light sensing device comprises a plurality of rows of light sensing units, a driving unit and a reading unit, and the plurality of rows of light sensing units are electrically connected with the driving unit and the reading unit; each adjacent M rows of light sensing units in the plurality of rows of light sensing units are combined into a light sensing unit group, and M is an integer greater than or equal to 2;
the reading method comprises the following steps:
controlling the multi-row light sensing units to output light sensing signals row by row through the driving unit; and
sequentially reading the light sensing signals output by each light sensing unit group through the reading unit; the time for reading the light sensing signals output by the M rows of light sensing units in one light sensing unit group is taken as a row reading period, and the reading units sequentially read the light sensing signals output by the M rows of light sensing units in the row reading period.
Optionally, the light sensing unit group includes a plurality of light sensing units, and the light sensing device further includes a plurality of read signal lines electrically connected to the plurality of light sensing units in a one-to-one correspondence; the plurality of light sensing units are electrically connected with the reading unit through the plurality of reading signal lines.
Optionally, any two of the light sensing unit groups share at least one of the read signal lines.
Optionally, the plurality of rows of light sensing units include a plurality of light sensing units, and the plurality of light sensing units are also distributed in a plurality of columns; the light sensing device further comprises a plurality of reading signal lines which are arranged in one-to-one correspondence with the light sensing units in a plurality of columns;
the light sensing units on the same column are electrically connected with the reading unit through the same reading signal line.
Optionally, the light sensing device further includes a plurality of scan lines and a plurality of rows of display units electrically connected to the plurality of scan lines in a one-to-one correspondence; the driving unit is electrically connected with the plurality of scanning lines;
each row of light sensing units is arranged in the same row as one row of display units in the plurality of rows of display units, and the light sensing units and the display units arranged in the same row are electrically connected with the same scanning line;
the driving unit controls the multi-row light sensing units to output light sensing signals row by row, and the method comprises the following steps:
the driving unit outputs scanning signals to the multi-row light sensing units row by row through the plurality of scanning lines; and
the multi-row light sensing unit outputs light sensing signals row by row according to the scanning signals.
Optionally, the light sensing device further includes a first substrate and a second substrate opposite to each other; the multiple rows of light sensing units are positioned on the first substrate; the second substrate includes a plurality of rows of display units;
the driving unit comprises a first sub-driving unit and a second sub-driving unit; the first sub-driving unit is electrically connected with the multi-row light sensing units; the second sub driving unit is electrically connected with the multi-row display unit;
the driving unit controls the multi-row light sensing units to output light sensing signals row by row, and the method comprises the following steps:
the first sub-driving unit outputs scanning signals to the multi-row light sensing units row by row;
the multi-row light sensing unit outputs light sensing signals row by row according to the scanning signals.
Optionally, the first substrate includes a color film substrate or a protective cover plate; the second substrate comprises an array substrate.
Optionally, the light sensing unit includes a light sensing device and a switching unit;
the light sensing device is electrically connected with the switch unit and is used for generating the light sensing signal;
the switch unit is also respectively and electrically connected with the driving unit and the reading unit and is used for periodically outputting the light induction signals to the reading unit.
Optionally, the light sensing device includes a light sensing transistor and a storage capacitor; the switching unit includes a switching transistor;
the control end and the first electrode end of the light sensing transistor are respectively connected with a first voltage and a second voltage so as to enable the light sensing transistor to continuously sense light and generate the light sensing signal; the second electrode terminal of the light sensing transistor is electrically connected with the first electrode terminal of the switching transistor;
one end of the storage capacitor is electrically connected with the control end of the light sensing transistor, and the other end of the storage capacitor is electrically connected with the second electrode end of the light sensing transistor;
the control end of the switching transistor is electrically connected with the driving unit, and the second electrode end of the switching transistor is electrically connected with the reading unit.
The application also provides a light sensing device which comprises a plurality of rows of light sensing units, a driving unit and a reading unit, wherein the plurality of rows of light sensing units are electrically connected with the driving unit and the reading unit; each adjacent M rows of light sensing units in the plurality of rows of light sensing units are combined into a light sensing unit group, and M is an integer greater than or equal to 2;
the light sensing device further comprises a controller, wherein the controller is electrically connected with the driving unit and the reading unit and is used for executing the light sensing signal reading method.
In the method and the device for reading the light sensing signals, the light sensing signals of the adjacent M rows of light sensing units are respectively read by a reading unit (for example, ROIC) in the same row reading period, wherein M is an integer greater than or equal to 2; the period (row reading period) of the light sensing signals of the light sensing units in one row is prolonged by the reading unit, so that the reading speed of the reading unit is reduced, and the cost of the reading unit is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an exemplary 2T1C photo-sensing circuit.
Fig. 2 is a schematic distribution diagram of a light sensing unit in a light sensing device according to an embodiment of the present application.
Fig. 3 is a flowchart of a method for reading a photo-sensing signal according to an embodiment of the present application.
Fig. 4 is a schematic distribution diagram of a light sensing unit and a display unit in a light sensing device according to an embodiment of the present application.
Fig. 5 is a schematic circuit diagram of a photo-sensing unit according to an embodiment of the present application.
Fig. 6 is a timing chart of reading a photo-sensing signal according to an embodiment of the present application.
Fig. 7 is a schematic distribution diagram of light sensing units in another light sensing device according to an embodiment of the present application.
Fig. 8 is a schematic distribution diagram of a light sensing unit and a display unit in another light sensing device according to an embodiment of the present application.
Fig. 9 is a schematic structural diagram of a light sensing device according to an embodiment of the present application.
Fig. 10 is a schematic distribution diagram of light sensing units in the light sensing device shown in fig. 9.
Fig. 11 is a schematic distribution diagram of a display unit in the light sensing device shown in fig. 9.
Fig. 12 is a schematic block diagram of a light sensing device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application.
Taking a 65 inch ultra high definition 4K (resolution 3840×2160) display panel as an example, the 2T1C photo-sensing circuit (i.e., photo-sensing unit) shown in fig. 1 is integrated in the array substrate of the display panel, and the gate of the switching thin film transistor of the photo-sensing circuit is shared with the gate of the display pixel thin film transistor. Wherein, the line time t displayed by the display panel line =1/120 Hz/2160≡3.8us. In order to ensure that the display panel has enough photosensitive precision, a photo-sensing unit is arranged in each 5 rows/5 columns of display pixels in the array substrate, so that the time t for the ROIC to read the photo-sensing signals of one row of photo-sensing units sen ＝5t line =22 us. However, it is difficult to achieve such short read times for most of the ROICs available today, and only a small fraction of the high cost ROICs are possible to achieve such short read times under extreme conditions. Therefore, on the premise of ensuring the light sensing and display functions, the reading period of the light sensing signals of each row of light sensing units needs to be prolonged by some methods, namely, the row reading period of the ROIC is prolonged, so as to reduce the cost of the ROIC.
In order to solve the above technical problems, the present application provides a method for reading a photo-sensing signal and a photo-sensing device, and the following embodiments are specifically referred to.
As shown in fig. 2 to 6, an embodiment of the present application provides a method for reading a photo-sensing signal applied to a photo-sensing device 10.
The light sensing device 10 in the embodiment of the present application may be a light sensing-display integrated panel, which has both a light sensing function and a display function; of course, in other embodiments, the light sensing device 10 may have only the light sensing function. The light sensing device 10 and the method for reading the light sensing signal will be described by taking the light sensing-display integrated panel structure as an example, and the specification parameters such as the size, resolution, refresh rate, etc. of the light sensing device 10 of the light sensing-display integrated panel structure are not limited in this application.
As shown in fig. 2, the light sensing device 10 includes a plurality of rows of light sensing units (S1-Sp, where p is a positive integer), a driving unit 2, and a reading unit 3. Wherein the plurality of rows of light sensing units are electrically connected with the driving unit 2 and the reading unit 3, respectively. Each adjacent M rows of light sensing units in the plurality of rows of light sensing units are combined into a light sensing unit group 4, and M is an integer greater than or equal to 2. In fig. 2, M is shown as an example where M is equal to 2, i.e. every 2 adjacent rows of light sensing units are combined into one light sensing unit group 4. Specifically, each row of light sensing units includes at least one light sensing unit 1, and in this embodiment, a plurality of light sensing units 1 are disposed in each row for illustration.
As shown in fig. 3, the method for reading the photo-sensing signal includes step S301 and step S302.
S301: the driving unit controls the light sensing units to output light sensing signals row by row.
Specifically, as shown in fig. 4, the light sensing device 10 further includes a plurality of scan lines (SL 1-SLi, where i is a positive integer), and a plurality of rows of display units electrically connected to the plurality of scan lines in a one-to-one correspondence, each row of display units including a plurality of display units 5. The driving unit 2 is electrically connected to a plurality of scan lines for supplying scan signals to the multi-line display unit. It is understood that the driving unit 2 is a gate driver, and the corresponding scan signal is a gate signal.
Specifically, as shown in fig. 4, the photo-sensing device 10 further includes a plurality of data lines (DL 1-DLj, where j is a positive integer) disposed on the array substrate 6, and a source driver 7 electrically connected to the plurality of data lines, the plurality of data lines are disposed perpendicular to the plurality of scan lines and insulated from each other, the plurality of data lines are electrically connected to the plurality of columns of display units in a one-to-one correspondence, and the source driver 7 provides data signals to the plurality of columns of display units through the plurality of data lines.
Specifically, the plurality of rows of display units and the plurality of rows of light sensing units are disposed on the same array substrate 6, each row of light sensing units is disposed in the same row as one of the rows of display units, and the light sensing units 1 and the display units 5 disposed in the same row are electrically connected with the same scanning line. It can be understood that the photo-sensing units 1 and the display units 5 arranged in the same row receive the same scanning signal, and the scanning signal drives the photo-sensing units 1 and the display units 5 in the corresponding row to be turned on at the same time, so that the row of photo-sensing units 1 outputs the photo-sensing signal, and the row of display units 5 is lighted.
Specifically, the plurality of light sensing units 1 are distributed among the plurality of rows of display units 5, and fig. 4 shows an example in which one light sensing unit 1 is disposed in each 5 rows and 5 columns of display units 5, and it is understood that the protection scope of the present application is not limited thereto, and the placement position and the placement density of any one light sensing unit 1 are all within the protection scope of the present application.
As shown in fig. 4, in a specific embodiment, the first line light sensing unit S1 and the second line display unit are disposed in the same line, and the first line light sensing unit S1 and the second line display unit are electrically connected to the scan line SL 2; the second row of light sensing units S2 is arranged in the same row as the seventh row of display units, and both the second row of light sensing units S2 and the seventh row of display units are electrically connected with the scanning line SL 7.
As shown in fig. 5, the light sensing unit 1 includes a light sensing device 8 and a switching unit 9. Wherein the light sensing device 8 is electrically connected with the switch unit 9, and is configured to receive external light and generate a light sensing signal (such as photo-generated carriers or photo-induced charges); the switch unit 9 is also electrically connected to the driving unit 2 and the reading unit 3, respectively, for periodically outputting a photo-sensing signal to the reading unit 3.
Specifically, the photo-sensing device 8 includes a photo-sensing transistor Q1 and a storage capacitor Cst; the switching unit 9 includes a switching transistor Q2. The control end and the first electrode end of the photo-sensing transistor Q1 are respectively connected with a first voltage SVGG and a second voltage SVDD so as to enable the photo-sensing transistor Q1 to continuously sense light and generate a photo-sensing signal; the second electrode terminal of the photo-sensing transistor Q1 is electrically connected to the first electrode terminal of the switching transistor Q2. One end of the storage capacitor Cst is electrically connected to a control terminal of the photo-sensing transistor Q1, and the other end of the storage capacitor Cst is electrically connected to a second electrode terminal of the photo-sensing transistor Q1, and is used for storing a photo-sensing signal. The control terminal of the switching transistor Q2 is electrically connected to the driving unit 2, and the second electrode terminal of the switching transistor Q2 is electrically connected to the reading unit 3. The control terminal of the switching transistor Q2 is configured to receive the scanning signal output by the driving unit 2, so as to periodically turn on and off the switching transistor Q2, thereby periodically providing the light sensing signal to the reading unit 3.
The embodiments of the present application do not limit the specific types and materials of the photo-sensing transistor Q1 and the switching transistor Q2. In one embodiment, the control terminal is a gate, the first electrode terminal is a drain, and the second electrode terminal is a source; in another embodiment the first electrode terminal and the second electrode terminal may be interchanged, i.e. the first electrode terminal is the source and the second electrode terminal is the drain.
It can be understood that the gate of the switching transistor Q2 of the light sensing unit 1 is electrically connected to the driving unit 2 through a scan line, and periodically receives the scan signal output by the driving unit 2, so that the switching transistor Q2 is periodically turned on and outputs the light sensing signal to the reading unit 3.
Specifically, the specific circuit structure of the light sensing unit 1 in the embodiment of the present application is not limited to the 2T1C circuit, and other circuits with similar light sensing performance such as 3T1C and 4T1C are all within the protection scope of the present application. The circuit configuration of the light sensing unit 1 will be described only by taking a 2T1C circuit as an example.
Specifically, step S301 includes the steps of:
the driving unit outputs scanning signals line by line to the multi-line light sensing unit through a plurality of scanning lines; and
the multi-row light sensing unit outputs light sensing signals row by row according to the scanning signals.
Since the gates of the switching transistors Q2 of each row of the photo-sensing units receive the scan signal, the scan signal may also be a gate signal, and as shown in fig. 6, the plurality of rows of the photo-sensing units (S1-Sp) receive the gate signals (GS 1-GSp) row by row, thereby outputting the photo-sensing units row by row.
It will be appreciated that the readable time of the photo-sensing signal of each row of photo-sensing units (i.e. the output time of the photo-sensing signal) and the row display time t of the display unit 5 line In positive correlation, when the panel size in the light sensing device 10 is larger, the resolution is higher, and the refresh rate is higher, the row display time of the display unit 5 is shorter, and the readable time of the light sensing signal of each row of light sensing units is shorter. When the readable time of the photo-sensing signals of each row of photo-sensing units is short, the requirement for the reading speed of the reading unit 3 is high, and the cost of the reading unit 3 is increased.
In the next step, the method of reading the photo-induced signal is improved to increase the row reading period T of the reading unit 3 and to reduce the reading rate of the reading unit 3, thereby reducing the cost of the reading unit 3.
It should be noted that, the row reading period T in the present application may be understood as a period in which the reading unit 3 reads the photo sensing signals of one row of photo sensing units, and this period is different from the readable time of the photo sensing signals of each row of photo sensing units 1. Since the readable time of the photo-sensing signals of each row of photo-sensing units is equal to the output time of the photo-sensing signals, the row reading period T may be greater than or equal to the readable time of the photo-sensing signals of each row of photo-sensing units, so as to ensure that the photo-sensing signals can be sufficiently read.
S302: sequentially reading the light sensing signals output by each light sensing unit group through a reading unit; the time for reading the light sensing signals output by the M rows of light sensing units in one light sensing unit group is taken as a row reading period, and the light sensing signals output by the M rows of light sensing units are sequentially read by the reading unit in the row reading period.
In the prior art, the row of the reading unit 3 is readThe period is equal to the reading time t of the light sensing signals of one row of sensing units sen . In step S302 of the embodiment of the present application, the photo-sensing unit group 4 is used as a reading unit to periodically read the photo-sensing signals, that is, the row reading period T of the reading unit 3 is the time for reading the photo-sensing signals output by the M rows of photo-sensing units in one photo-sensing unit group 4. In a row reading period T, the photo-sensing signals output by the M rows of photo-sensing units are respectively read, so that the row reading period T is equal to the reading time T of the photo-sensing signals of the row of sensing units sen M times of (c). Compared with the prior art, the embodiment of the application expands the row reading period T of the reading unit 3 to M times of the existing row reading period, effectively prolongs the row reading period T of the reading unit 3, reduces the reading rate of the reading unit 3, and can effectively reduce the cost of the reading unit 3.
As shown in fig. 6, taking M as an example equal to 2, in one row reading period T, the light sensing signals of the adjacent 2 rows of light sensing units (e.g. S1 and S2) are respectively read by the reading unit 3, and at this time, the row reading period T of the reading unit 3 is equal to the reading time of the light sensing signals of the adjacent 2 rows of light sensing units, so that the row reading period T of the reading unit 3 is increased by two times as much as the original, thereby reducing the reading rate of the reading unit 3 by half, and being beneficial to reducing the cost of the reading unit 3.
Specifically, as shown in fig. 2, each of the light sensing unit groups 4 includes a plurality of light sensing units 1. It will be appreciated that each row of light sensing units comprises at least one light sensing unit 1, and the number of light sensing units 1 of different rows may be the same or different. The present embodiment will be described taking an example in which each row of the light sensing units includes the same number of light sensing units 1.
Specifically, as shown in fig. 2, the photo-sensing device 10 further includes a plurality of read signal lines (RL 1-RL2q, where q is a positive integer) electrically connected to the plurality of photo-sensing units 1 in each photo-sensing unit group 4 in one-to-one correspondence. At least one readout signal line RL is shared by any two light sensing unit groups 4, and when the number of light sensing units 1 in each light sensing unit group 4 is the same and the light sensing units are correspondingly arranged, the plurality of light sensing unit groups 4 share the plurality of readout signal lines. For example, as shown in fig. 2, 2q photo-sensing units 1 in the photo-sensing unit group 4 composed of two adjacent rows of photo-sensing units S1 and S2 are electrically connected to the reading unit 3 through 2q reading signal lines RL, respectively; and 2q photo-sensing units 1 in the photo-sensing unit group 4 formed by two adjacent rows of photo-sensing units S3 and S4 are electrically connected with the reading unit 3 through the same 2q reading signal lines RL.
In one embodiment, the reading unit 3 is a read integrated circuit ROIC.
Specifically, the read signal line RL may be disposed in parallel with the data line, but is not limited thereto. It will be appreciated that the read signal lines RL intersect the scan lines and are arranged in an insulating manner, and may be arranged perpendicular to the scan lines in a vertical and insulating manner.
It can be understood that in the present embodiment, the plurality of light sensing units 1 in each light sensing unit group 4 are electrically connected with the reading unit 3 through independent reading signal lines RL, so that in the same row reading period T, the light sensing signals of the plurality of different light sensing units 1 in the light sensing unit group 4 enter different reading channels in the reading unit 3 to be read, which is beneficial to ensuring that the light sensing precision of the light sensing units 1 is not lost.
In this embodiment, the photo-sensing signals of adjacent rows of photo-sensing units 1 are respectively read by the reading units (for example, ROIC) 3 in the same row reading period T, so that the period (row reading period T) of reading the photo-sensing signals of one row of photo-sensing units 1 by the reading units 3 is prolonged, thereby reducing the reading rate of the reading units 3 and being beneficial to reducing the cost of the reading units 3; meanwhile, the plurality of photo-sensing units 1 in each photo-sensing unit group 4 in the embodiment are electrically connected with the reading unit 3 through independent reading signal lines RL, so that the photo-sensing signals of the plurality of photo-sensing units 1 in the same row reading period T can be accurately read, which is beneficial to ensuring that the photo-sensing precision of the plurality of photo-sensing units 1 in the same row reading period T is not lost.
As shown in fig. 7 and 8, the present application also provides a method for reading a photo-sensing signal, which is different from the above embodiment in the manner of setting the read signal line RL. In this embodiment, the plurality of light sensing units 1 in the plurality of rows of light sensing units are also arranged in a plurality of columns (for example, q columns). A plurality of reading signal lines (RL 1-RLq) in the light sensing device 10 are arranged in one-to-one correspondence with the plurality of rows of light sensing units; and the photo-sensing units 1 on the same column are electrically connected with the reading unit 3 through the same reading signal line RL. For example, as shown in fig. 7, each column of the light sensing units is electrically connected to a corresponding one of the read signal lines.
The number of read signal lines RL in the present embodiment can be reduced by half as compared with the arrangement of the read signal lines RL shown in fig. 2. It can be understood that, in step S302, when the photo-sensing signals of the M rows of photo-sensing units in one photo-sensing unit group 4 are read in one row reading period T, the photo-sensing signals of the plurality of photo-sensing units 1 on the same column enter the same reading channel of the reading unit 3 through the same reading signal line RL, so that the M rows of photo-sensing signals are combined and accumulated. Although this arrangement reduces the accuracy of partial light sensing, a large number of read signal lines RL can be saved, which is advantageous for simplifying the circuit structure, so that the frame of the light sensing device 10 can be reduced, and the risk of line short-circuiting can be reduced.
In this embodiment, the photo-sensing signals of adjacent rows of photo-sensing units 1 are respectively read by the reading units (for example, ROIC) 3 in the same row reading period T, so that the period (row reading period T) of reading the photo-sensing signals of one row of photo-sensing units 1 by the reading units 3 is prolonged, thereby reducing the reading rate of the reading units 3 and being beneficial to reducing the cost of the reading units 3; meanwhile, a large number of read signal lines RL can be saved, which is beneficial to simplifying the circuit structure, thereby reducing the frame of the light sensing device 10 and reducing the risk of line short circuit.
As shown in fig. 9 to 11, the embodiment of the present application further provides a method for reading a photo-sensing signal, which is different from the above embodiment in that the installation positions of the photo-sensing unit 1 and the display unit 5 are different.
Specifically, as shown in fig. 9, the light sensing device 10 includes a first substrate 11 and a second substrate 12 that are opposed to each other. As shown in fig. 10, a plurality of rows of light sensing units (S1-Sp) are located on the first substrate 11; the first substrate 11 includes a plurality of first scan lines (SLS 1-SLSp) electrically connected to the plurality of rows of photo sensing units in a one-to-one correspondence. As shown in fig. 11, the second substrate 12 includes a plurality of rows of display units 5 and a plurality of second scan lines (SL 1-SLi) electrically connected to the plurality of rows of display units 5 in one-to-one correspondence. As shown in fig. 10 and 11, the driving unit 2 includes a first sub driving unit 21 and a second sub driving unit 22; the first sub-driving unit 21 is electrically connected to the plurality of rows of light sensing units 1 through a plurality of first scanning lines, and the second sub-driving unit 22 is correspondingly electrically connected to the plurality of rows of display units 5 through a plurality of second scanning lines. The first sub-driving unit 21 and the second sub-driving unit 22 provide independent scanning signals to the light sensing unit 1 and the display unit 5, respectively.
Specifically, a plurality of read signal lines RL are also provided on the first substrate 11 so that the photo-sensing unit 1 is electrically connected to the reading unit 3. And, a plurality of data lines DL are disposed on the second substrate 12 so that the display unit 5 is electrically connected to the source driver 7.
Specifically, the first substrate 11 is a color film substrate or a protective cover plate; the second substrate 12 is an array substrate 6. The light sensing device 10 may be a liquid crystal display panel or an OLED display panel, and the specific display type of the light sensing device 10 is not limited in this application.
Specifically, step S301 includes the steps of:
the first sub-driving unit outputs scanning signals to the multi-row light sensing units row by row through a plurality of first scanning lines; and
the multi-row light sensing unit outputs light sensing signals row by row according to the scanning signals.
Specifically, the first sub-driving unit 21 supplies a scan signal to the control terminal of the switching transistor Q2 in the photo-sensing unit 1.
It will be appreciated that the second sub-driving unit 22 outputs another scan signal to the multi-line display unit 5 line by a plurality of second scan signals to light up the multi-line display unit 5 line by line. The first and second sub driving units 21 and 22 may be gate drivers.
Although fig. 10 shows the case where the same column of photo sensing units is electrically connected to the same read signal line RL, the arrangement of the read signal line is not limited thereto, and the read signal line RL may be arranged as shown in fig. 2.
In this embodiment, the photo-sensing signals of adjacent rows of photo-sensing units 1 are respectively read by the reading units (for example, ROIC) 3 in the same row reading period T, so that the period (row reading period T) of reading the photo-sensing signals of one row of photo-sensing units 1 by the reading units 3 is prolonged, thereby reducing the reading rate of the reading units 3 and being beneficial to reducing the cost of the reading units 3; in addition, the light sensing units 1 and the display units 5 in the embodiment of the application are respectively arranged on different substrates, and are driven by different sub-driving units, so that the readable time of each row of light sensing units is not influenced by the row display time of the display units 5, the readable time of the light sensing signals of one row of light sensing units can be independently regulated, and the reading rate of the reading unit 3 can be regulated to control the cost of the reading unit 3.
As shown in fig. 2 to 12, the embodiment of the present application further provides a light sensing device 10, where the light sensing device 10 includes a plurality of rows of light sensing units 1, a driving unit 2, a reading unit 3, and a controller 13. The multi-row light sensing unit 1 is electrically connected with the driving unit 2 and the reading unit 3; each adjacent M rows of light sensing units in the plurality of rows of light sensing units 1 are combined into a light sensing unit group 4, and M is an integer greater than or equal to 2. The controller 13 is electrically connected to the driving unit 2 and the reading unit 3, and is configured to perform the method for reading the photo-sensing signal provided in any one of the above embodiments.
The specific structure of the light sensing device 10 can be referred to the description of the above embodiments of the light sensing signal reading method, and will not be repeated here.
In this embodiment, the photo-sensing signals of adjacent rows of photo-sensing units 1 are respectively read by the reading units (for example, ROIC) 3 in the same row reading period T, so that the period (row reading period T) of reading the photo-sensing signals of one row of photo-sensing units 1 by the reading units 3 is prolonged, thereby reducing the reading rate of the reading units 3 and being beneficial to reducing the cost of the reading units 3.
The above description is provided in detail for a method for reading a photo-sensing signal and a photo-sensing device provided in the embodiments of the present application, and specific examples are applied to illustrate the principles and embodiments of the present application, where the above description of the embodiments is only for helping to understand the method and core ideas of the present application; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.
Claims (8)
1. The method for reading the light sensing signals is applied to a light sensing device and is characterized in that the light sensing device comprises a plurality of rows of light sensing units, a driving unit and a reading unit, wherein the plurality of rows of light sensing units are electrically connected with the driving unit and the reading unit; each adjacent M rows of light sensing units in the plurality of rows of light sensing units are combined into a light sensing unit group, and M is an integer greater than or equal to 2; the light sensing device comprises a light sensing unit group, a light sensing unit group and a light sensing unit, wherein the light sensing unit group comprises a plurality of light sensing units, the light sensing device further comprises a plurality of reading signal lines which are electrically connected with the light sensing units of the light sensing unit group in a one-to-one correspondence manner, and the light sensing units of the light sensing unit group are electrically connected with the reading units through the plurality of reading signal lines which are electrically connected with the light sensing units in the one-to-one correspondence manner respectively; the reading method comprises the following steps:
controlling the multi-row light sensing units to output light sensing signals row by row through the driving unit; and
sequentially reading the light sensing signals output by each light sensing unit group through the reading unit; the time for reading the light sensing signals output by the M rows of light sensing units in one light sensing unit group is taken as a row reading period, and the reading units sequentially read the light sensing signals output by the M rows of light sensing units in the row reading period.
2. The method for reading a photo-sensing signal according to claim 1, wherein any two of the photo-sensing cell groups share at least one of the read signal lines.
3. The method according to claim 1, wherein the light sensing device further comprises a plurality of scanning lines and a plurality of rows of display units electrically connected to the plurality of scanning lines in a one-to-one correspondence; the driving unit is electrically connected with the plurality of scanning lines;
each row of light sensing units is arranged in the same row as one row of display units in the plurality of rows of display units, and the light sensing units and the display units arranged in the same row are electrically connected with the same scanning line;
the driving unit controls the multi-row light sensing units to output light sensing signals row by row, and the method comprises the following steps:
the driving unit outputs scanning signals to the multi-row light sensing units row by row through the plurality of scanning lines; and
the multi-row light sensing unit outputs light sensing signals row by row according to the scanning signals.
4. The method of claim 1, wherein the light sensing device further comprises a first substrate and a second substrate opposite to each other; the multiple rows of light sensing units are positioned on the first substrate; the second substrate includes a plurality of rows of display units;
the driving unit comprises a first sub-driving unit and a second sub-driving unit; the first sub-driving unit is electrically connected with the multi-row light sensing units; the second sub driving unit is electrically connected with the multi-row display unit;
the driving unit controls the multi-row light sensing units to output light sensing signals row by row, and the method comprises the following steps:
the first sub-driving unit outputs scanning signals to the multi-row light sensing units row by row; and
the multi-row light sensing unit outputs light sensing signals row by row according to the scanning signals.
5. The method according to claim 4, wherein the first substrate comprises a color film substrate or a protective cover plate; the second substrate comprises an array substrate.
6. The method for reading a photo-sensing signal according to claim 1, wherein the photo-sensing unit comprises a photo-sensing device and a switching unit;
the light sensing device is electrically connected with the switch unit and is used for generating the light sensing signal;
the switch unit is also respectively and electrically connected with the driving unit and the reading unit and is used for periodically outputting the light induction signals to the reading unit.
7. The method of reading a photo-sensing signal according to claim 6, wherein the photo-sensing device comprises a photo-sensing transistor and a storage capacitor; the switching unit includes a switching transistor;
the control end and the first electrode end of the light sensing transistor are respectively connected with a first voltage and a second voltage so as to enable the light sensing transistor to continuously sense light and generate the light sensing signal; the second electrode terminal of the light sensing transistor is electrically connected with the first electrode terminal of the switching transistor;
one end of the storage capacitor is electrically connected with the control end of the light sensing transistor, and the other end of the storage capacitor is electrically connected with the second electrode end of the light sensing transistor;
the control end of the switching transistor is electrically connected with the driving unit, and the second electrode end of the switching transistor is electrically connected with the reading unit.
8. The light sensing device is characterized by comprising a plurality of rows of light sensing units, a driving unit and a reading unit, wherein the plurality of rows of light sensing units are electrically connected with the driving unit and the reading unit; each adjacent M rows of light sensing units in the plurality of rows of light sensing units are combined into a light sensing unit group, and M is an integer greater than or equal to 2;
the light sensing device further comprises a controller electrically connected to the driving unit and the reading unit for performing the method of reading the light sensing signal according to any one of claims 1 to 7.
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