CN108398243B - Display panel, detection method thereof and display device - Google Patents
Display panel, detection method thereof and display device Download PDFInfo
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- CN108398243B CN108398243B CN201810168105.6A CN201810168105A CN108398243B CN 108398243 B CN108398243 B CN 108398243B CN 201810168105 A CN201810168105 A CN 201810168105A CN 108398243 B CN108398243 B CN 108398243B
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Abstract
The invention provides a display panel, a detection method thereof and a display device, and belongs to the technical field of display. The display panel comprises a plurality of switch selection lines and a plurality of reading lines which are arranged in a crossed manner; and a voltage following unit and a second switching unit; a pixel detection circuit is arranged at the crossing position of the switch selection line and the reading line; the pixel detection circuit comprises a first switch unit and a first photosensitive unit connected with the first switch unit; the first switch units in the pixel detection circuits in the same row are connected with the same switch selection line; the first switch units in the pixel detection circuits in the same column are connected with the same reading line; the second switch unit is connected between the voltage following unit and the reading line; the second switch unit is used for being opened in the integration stage of the pixel detection circuit of the second switch unit and outputting the following voltage generated by the voltage following unit to the first switch unit so as to prevent the first switch unit from generating leakage current.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a display panel, a detection method thereof and a display device.
Background
As shown in fig. 1, a display panel having a plurality of passive pixel detection circuits arranged in an array is provided in the prior art. The pixel detection circuits in the same row are connected to the same switch selection line SELSEL, and the pixel detection circuits in the same column are connected to the same readout line.
The pixel detection circuit array of fig. 1, when operating, includes one photodiode PD and one transistor T for each pixel detection circuit; when the photodiode is illuminated by the PD, photocurrent is accumulated and generated, the transistor T is controlled to be turned on by the switch line SEL during the sampling period, and the photocurrent generated by the photodiode PD is read by the read line, so that the control unit can analyze information detected by the pixel detection circuit. If the read line is coupled externally during accumulation, the voltage across the transistor T is likely to change, and V is likely to be changedDSIncreased, but larger VDSA large leakage occurs, which affects the charge accumulated by the PD, further causing the output VOUT
Different results, namely noise, are obtained.
Disclosure of Invention
The present invention is directed to at least one of the technical problems in the prior art, and provides a display panel with accurate pixel detection result, a detection method thereof, and a display device.
The technical scheme adopted for solving the technical problem is that the display panel comprises a plurality of switch selection lines and a plurality of reading lines which are arranged in a crossed manner; a pixel detection circuit is arranged at the crossing position of the switch selection line and the reading line; the pixel detection circuit comprises a first switch unit and a first photosensitive unit connected with the first switch unit; the first switch units in the pixel detection circuits in the same row are connected with the same switch selection line; the first switch units in the pixel detection circuits in the same column are connected with the same reading line; the display panel further includes: a voltage following unit and a second switching unit; wherein the content of the first and second substances,
the second switching unit is connected between the voltage following unit and the read line; the second switch unit is used for being opened in an integration stage of the pixel detection circuit, and outputting the following voltage generated by the voltage following unit to the first switch unit so as to prevent the first switch unit from generating leakage current.
Preferably, the voltage following unit includes: a third switching unit, and a second light sensing unit connected to the third switching unit; wherein the content of the first and second substances,
the third switch unit and the second photosensitive unit are both connected with the second switch unit;
and the third switching unit is turned on under the control of a reset signal when the pixel detection circuit connected with the second switching unit is in a reset stage, and resets the second photosensitive unit through a reset voltage.
Further preferably, the voltage follower unit further includes: a buffer; wherein the content of the first and second substances,
the positive phase input end of the buffer is connected with the third switch unit and the second photosensitive unit, and the negative phase input end of the buffer is connected with the output end of the buffer; and the output end of the buffer is connected with the second switch unit.
Further preferably, the first photosensitive unit includes: a first photodiode; the second photosensitive unit includes: a second photodiode; and the first photodiode are the same in size; wherein the content of the first and second substances,
the first pole of the first photodiode is connected with the first switch unit, and the second pole of the first photodiode is connected with a reverse bias voltage end;
and a first pole of the second photodiode is connected with the second switch unit and the positive phase input end of the buffer, and a second pole of the second photodiode is connected with a reverse bias voltage end.
It is further preferable that the third switching unit includes a third transistor; wherein the content of the first and second substances,
the first pole of the third transistor is connected with a reset voltage end, the second pole of the third transistor is connected with the second photosensitive unit and the non-inverting input end of the buffer, and the control pole of the third transistor is connected with a reset line.
It is further preferable that the second switching unit includes a second transistor; wherein the content of the first and second substances,
and the first pole of the second transistor is connected with the output end of the buffer, the second pole of the second transistor is connected with the reading line, and the control pole of the second transistor is connected with an auxiliary control line.
Preferably, the first switching unit includes a first transistor; wherein the content of the first and second substances,
the first electrode of the first transistor is connected with the first photosensitive unit, the second electrode of the first transistor is connected with the reading line, and the control electrode of the first transistor is connected with the selection control line.
Preferably, the display panel further includes: the system comprises an integrator, a sampling holder, an analog-to-digital converter and a data processor; wherein the content of the first and second substances,
the integrator is connected with the reading line and is used for accumulating the voltage output by the reading line to generate an accumulated voltage;
the sampling holder is used for sampling and holding the accumulated voltage so as to ensure that the accumulated voltage input into the analog-to-digital converter is stable;
the analog-to-digital converter is used for performing digital-to-analog conversion on the accumulated voltage after sampling and holding and outputting the accumulated voltage to the data processor;
and the data processor is used for determining detection information according to the digital voltage.
The technical scheme adopted for solving the technical problem of the invention is a detection method of the display panel, which comprises the following steps:
an integration stage: and controlling the second switch unit to be opened, outputting the following voltage generated by the voltage following unit to the first switch unit, and controlling the following voltage generated by the following unit to be equal to the voltage generated by the first photosensitive unit in the integration stage so as to prevent the first switch unit from generating leakage current.
The technical scheme adopted for solving the technical problem of the invention is a display device which comprises the display panel.
The invention has the following beneficial effects:
in the display panel, the voltage following unit is connected on the reading line, and when the voltage following unit is in an integration stage with the pixel detection circuit electrically connected with the voltage following unit, the same following voltage is generated according to the electric signal generated by the first photosensitive unit, so that the voltages loaded at two ends of the first switch unit are equal, and therefore the first switch unit can be in an off state, and the electric signal output by the reading line is prevented from generating leakage current and having noise.
Drawings
FIG. 1 is a schematic structural diagram of a conventional display panel;
fig. 2 is a schematic structural diagram of a display panel according to embodiment 1 of the present invention;
fig. 3 is a schematic view of a specific structure of a display panel according to embodiment 1 of the present invention;
FIG. 4 is a timing diagram illustrating a detection method of the display panel shown in FIG. 3.
Wherein the reference numerals are: 1. a pixel detection circuit; 2. a second switching unit; 3. a voltage following unit; 4. an integrator; 5. a sample holder; 6. an analog-to-digital converter; 7. a data processor; t1, a first transistor; t2, a second transistor, T3, a third transistor; PD1, a first photodiode; PD2, second photodiode; SEL, switch selection line SEL; read line, read line.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1:
as shown in fig. 2, the present embodiment provides a display panel, which includes a plurality of switch selection lines SEL and a plurality of read lines readline that are arranged in a crossing manner; a pixel detection circuit 1 is arranged at the crossing position of the switch selection line SEL and the reading line readline; the pixel detection circuit 1 comprises a first switch unit and a first photosensitive unit connected with the first switch unit; wherein, the first switch units in the pixel detection circuits 1 in the same row are connected with the same switch selection line SEL; the first switch units in the pixel detection circuits 1 in the same column are connected to the same readout line; specifically, the display panel in this embodiment further includes: a voltage following unit 3 and a second switching unit 2; the second switch unit 2 is connected between the voltage follower unit 3 and the read line readline;
and the second switch unit 2 is used for being opened in an integration stage of the pixel detection circuit 1, and outputting the following voltage generated by the voltage following unit 3 to the first switch unit so as to prevent the first switch unit from generating leakage current.
Since the voltage follower unit 3 is connected to the readout line in the display panel of this embodiment, and when the voltage follower unit 3 is in the integration phase with the pixel detection circuit 1 electrically connected to the voltage follower unit, the same follower voltage is generated according to the electrical signal generated by the first photosensitive unit, so that the voltages loaded at the two ends of the first switch unit are equal, the first switch unit can be in the off state, and the first switch unit is prevented from generating a leakage current, which causes a noise in the electrical signal output by the readout line.
The voltage following unit 3 in this embodiment includes a third switching unit and a second photosensitive unit connected to the third switching unit; the third switching unit and the second photosensitive unit are both connected to the second switching unit 2.
Specifically, the third switching unit is turned on under the control of a reset signal when the pixel detection circuit 1 connected to the second switching unit 2 connected thereto is in a reset phase, and the second photosensitive unit is reset by a reset voltage. The second switch unit 2 is in an off state in a reset stage, the first switch unit and the second switch unit 2 are controlled to be opened in the reset stage, and the second photosensitive unit is reset through a reset voltage at the moment; resetting the first photosensitive unit by a reset voltage input to a read line such that initial states of the first and second photosensitive units are the same; in the integration stage, the second switch unit 2 is controlled to be turned on, the first switch unit and the second switch unit 2 are controlled to be turned off, the first photosensitive unit and the second photosensitive unit generate corresponding electric signals according to the received optical signals in the integration stage, and the voltages loaded at two ends of the first switch unit are equal, so that the first switch unit can be in a turned-off state, the first switch unit is prevented from generating leakage current, and noise exists in the electric signals output by the read line.
Further, the voltage following unit 3 further includes: a buffer; the positive phase input end of the buffer is connected with the third switching unit and the second photosensitive unit, and the negative phase input end of the buffer is connected with the output end of the buffer; the output end of the buffer is connected with the second switch unit 2.
Since the buffer is added to the voltage follower unit 3 of this embodiment, the electric signal generated by the second photosensitive unit can output a stable follower voltage after passing through the buffer.
Wherein, the first photosensitive unit in this embodiment includes: a first photodiode PD 1; the second photosensitive unit includes: a second photodiode PD 2; and the first photodiode PD1 and the first photodiode PD1 are the same size; specifically, a first pole of the first photodiode PD1 is connected to the first switching unit, and a second pole is connected to the reverse bias voltage terminal; a first pole of the second photodiode PD2 is connected to the second switching unit 2 and the non-inverting input terminal of the buffer, and a second pole is connected to the inverting voltage terminal.
The reason why the first photodiode PD1 and the second photodiode PD2 having the same size are selected is that when receiving the same illumination, the electrical signals generated by the two photodiodes are the same, which not only satisfies the condition that the voltages applied to the two ends of the first switch unit are equal, but also makes the manufacturing process simple.
In this embodiment, the first switch unit is a first transistor T1, the second switch unit 2 is a second transistor T2, and the third switch unit is a third transistor T3; specifically, a first pole of the first transistor T1 is connected to the first light sensing unit, a second pole is connected to the readout line, and a control pole is connected to the selection control line; a first pole of the second transistor T2 is connected to the output end of the buffer, a second pole is connected to the read line, and a control pole is connected to the auxiliary control line; the third transistor T3 has a first electrode connected to the reset voltage terminal, a second electrode connected to the second light sensing unit and the non-inverting terminal of the buffer, and a control electrode connected to the reset line.
In the embodiment, the transistor is used as the switch element, so that the structure is simple, and convenience is brought to control.
Of course, the display panel of the present embodiment further includes: an integrator 4, a sample holder 5, an analog-to-digital converter, a data processor 7; the integrator 4 is connected to the read line readline, and is configured to accumulate a voltage output by the read line readline to generate an accumulated voltage; a sample holder 5 for sample-holding the accumulated voltage to ensure that the accumulated voltage input into the analog-to-digital converter 6 is stable; the analog-to-digital converter 6 is used for performing digital-to-analog conversion on the accumulated voltage after sampling and holding and outputting the accumulated voltage to the data processor 7; and a data processor 7 for determining the detection information based on the digital voltage.
In this embodiment, each readout line can be connected to the data selector, and then one voltage follower unit 3 is used to connect each readout line through the data selector, so that the voltage follower unit 3 can be controlled by the data selector according to specific requirements to generate a follower voltage to be loaded to the corresponding readout line, and the configuration can make the structure of the display panel simple, and the operating principle of the voltage follower unit 3 is completely the same as that of the voltage follower unit 3.
The following provides a specific structure of a display panel, which includes a plurality of pixel detection circuits 1 arranged in an array, and an integrator 4, a sample holder 5, an analog-to-digital converter, and a data processor 7 connected to each readout line; in this embodiment, the connection relationship of the pixel detection circuits 1 in the first row is taken as an example for description.
As shown in fig. 3, each pixel detection circuit 1 includes a first transistor T1 and a first photodiode PD 1; the voltage following unit 3 includes a third transistor T3 and a second photodiode PD2 and a buffer; a second transistor T2 is connected to the read line readline; a first pole of the first transistor T1 is connected to a first pole of the first photodiode PD1, a second pole is connected to a read line, and a control pole is connected to a switch selection line SEL; the second pole of the first photodiode PD1 is connected with a reverse bias voltage end; a first pole of the second transistor T2 is connected with the output end of the buffer, a second pole is connected with a read line, and a control pole is connected with an auxiliary control line; a first pole of the third transistor T3 is connected to the reset voltage terminal, a second pole is connected to the first pole of the second photodiode PD2 and the non-inverting input terminal of the buffer, and a control pole is connected to the reset line; the second pole of the second photodiode PD2 is connected with a reverse bias voltage end; the inverting input terminal of the buffer is connected to the output terminal thereof.
The first photodiode PD1 and the second photodiode PD2 are identical in size and performance. For the polarity of the signals input to the reset line and the auxiliary control line to be opposite, for example, when a high level signal is input to the reset line, a low level signal is input to the auxiliary control line; otherwise, the opposite is true.
It should be noted that the transistors used in this embodiment may be thin film transistors or field effect transistors or other devices with the same characteristics, and since the source and the drain of the transistors used may be interchanged under certain conditions, the source and the drain are not different from the description of the connection relationship. In the embodiment of the present invention, to distinguish the source and the drain of the transistor, one of the poles is referred to as a first pole, the other pole is referred to as a second pole, and the gate is referred to as a control pole. In addition, the transistors can be divided into N-type and P-type according to the characteristic distinction of the transistors, and the first transistor T1, the second transistor T2, and the third transistor T3 are all N-type transistors in this embodiment as an example; wherein, the working level is high level for the N-type transistor; the non-working level is a low level; of course, it is easy for those skilled in the art to realize the first transistor T1, the second transistor T2, and the third transistor T3 as P-type transistors without creative efforts, and therefore, the present invention is within the protection scope of the embodiments of the present invention.
The detection method of the display panel described above is specifically described below with reference to fig. 3 and 4.
A reset phase: inputting high-level signals to a reset line and a switch selection line SEL row by row, turning on the corresponding first transistor T1 and the third transistor T3, and writing a reset signal input through the integrator 4 on a read line to reset the first photodiode PD1 in each pixel detection circuit 1 connected to the read line; meanwhile, the third transistor T3 in the voltage follower unit 3 turns on the reset voltage written on the reset voltage terminal to reset the second photodiode PD 2.
An integration stage: the auxiliary control line is inputted with a high level signal, the second transistor T2 is turned on, at this stage, the first transistor T1 and the third transistor T3 are turned off, the first photodiode PD1 and the second photodiode PD2 generate corresponding electrical signals according to the optical signals sensed by the first photodiode PD1 and the second photodiode PD2, since the first photodiode PD1 and the second photodiode PD2 have the same size and performance, at this time, the electrical signals generated by the first photodiode PD1 and the second photodiode PD2 are the same, the electric signal generated to the second photodiode PD2 becomes stable after passing through the buffer, and then is loaded on the drain of the first transistor T1 electrically connected thereto, so that the voltages applied to the source and the drain of the first transistor T1 are the same, it is ensured that the first transistor T1 is in an off state, thereby preventing the first transistor T1 from generating a leakage current, which causes noise in the electrical signal output from the read line.
A sampling stage: high level signals are input to the reset line and the switch selection line SEL row by row, the corresponding first transistor T1 and the corresponding third transistor T3 are all opened, and a low level signal is input to the auxiliary control line to control the second transistor T2 to be turned off; outputting an electric signal accumulated by the first photodiode PD1 in an integration stage through a read line, and then accumulating a voltage output by the read line through an integrator 4 connected to the read line to generate an accumulated voltage; the sample holder 5 carries out sample holding on the accumulated voltage so as to ensure that the accumulated voltage input into the analog-to-digital converter 6 is stable; the analog-to-digital converter 6 performs digital-to-analog conversion on the sampled and held accumulated voltage and outputs the converted voltage to the data processor 7; the data processor 7 determines detection information from the digital voltage.
Example 2:
the present embodiment provides a display device including the display panel in embodiment 1. Therefore, the display device of the embodiment has better display effect.
The display device may be a liquid crystal display device or an electroluminescent display device, such as any product or component with a display function, such as a liquid crystal panel, electronic paper, an OLED panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (9)
1. A display panel comprises a plurality of switch selection lines and a plurality of reading lines which are arranged in a crossed manner; a pixel detection circuit is arranged at the crossing position of the switch selection line and the reading line; the pixel detection circuit comprises a first switch unit and a first photosensitive unit connected with the first switch unit; the first switch units in the pixel detection circuits in the same row are connected with the same switch selection line; the first switch units in the pixel detection circuits in the same column are connected with the same reading line; it is characterized by also comprising: a voltage following unit and a second switching unit; wherein the content of the first and second substances,
the second switching unit is connected between the voltage following unit and the read line; the second switch unit is used for being opened in an integration stage of the pixel detection circuit and outputting the following voltage generated by the voltage following unit to the first switch unit so as to prevent the first switch unit from generating leakage current;
the voltage following unit includes: a third switching unit, and a second light sensing unit connected to the third switching unit; wherein the content of the first and second substances,
the third switch unit and the second photosensitive unit are both connected with the second switch unit;
and the third switching unit is turned on under the control of a reset signal when the pixel detection circuit connected with the second switching unit is in a reset stage, and resets the second photosensitive unit through a reset voltage.
2. The display panel according to claim 1, wherein the voltage following unit further comprises: a buffer; wherein the content of the first and second substances,
the positive phase input end of the buffer is connected with the third switch unit and the second photosensitive unit, and the negative phase input end of the buffer is connected with the output end of the buffer; and the output end of the buffer is connected with the second switch unit.
3. The display panel according to claim 2, wherein the first photosensitive unit comprises: a first photodiode; the second photosensitive unit includes: a second photodiode; and the first photodiode are the same in size; wherein the content of the first and second substances,
the first pole of the first photodiode is connected with the first switch unit, and the second pole of the first photodiode is connected with a reverse bias voltage end;
and a first pole of the second photodiode is connected with the second switch unit and the positive phase input end of the buffer, and a second pole of the second photodiode is connected with a reverse bias voltage end.
4. The display panel according to claim 2, wherein the third switching unit includes a third transistor; wherein the content of the first and second substances,
the first pole of the third transistor is connected with a reset voltage end, the second pole of the third transistor is connected with the second photosensitive unit and the non-inverting input end of the buffer, and the control pole of the third transistor is connected with a reset line.
5. The display panel according to claim 2, wherein the second switch unit includes a second transistor; wherein the content of the first and second substances,
and the first pole of the second transistor is connected with the output end of the buffer, the second pole of the second transistor is connected with the reading line, and the control pole of the second transistor is connected with an auxiliary control line.
6. The display panel according to claim 1, wherein the first switching unit comprises a first transistor; wherein the content of the first and second substances,
the first electrode of the first transistor is connected with the first photosensitive unit, the second electrode of the first transistor is connected with the reading line, and the control electrode of the first transistor is connected with the selection control line.
7. The display panel according to claim 1, characterized in that the display panel further comprises: the system comprises an integrator, a sampling holder, an analog-to-digital converter and a data processor; wherein the content of the first and second substances,
the integrator is connected with the reading line and is used for accumulating the voltage output by the reading line to generate an accumulated voltage;
the sampling holder is used for sampling and holding the accumulated voltage so as to ensure that the accumulated voltage input into the analog-to-digital converter is stable;
the analog-to-digital converter is used for performing digital-to-analog conversion on the accumulated voltage after sampling and holding and outputting the accumulated voltage to the data processor;
and the data processor is used for determining detection information according to the digital voltage.
8. The method for inspecting a display panel according to any one of claims 1 to 7, comprising:
an integration stage: controlling the second switch unit to be opened, outputting the following voltage generated by the voltage following unit to the first switch unit, and controlling the following voltage generated by the voltage following unit to be equal to the voltage generated by the first photosensitive unit in the integration stage so as to prevent the first switch unit from generating leakage current;
a reset phase: controlling the first switch unit and the second switch unit to be opened, and resetting the second photosensitive unit through the reset voltage; the first photosensitive unit is reset by a reset voltage input to the read line.
9. A display device characterized by comprising the display panel according to any one of claims 1 to 7.
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