CN111681605B - Photosensitive photoelectric device drive control circuit and display device - Google Patents
Photosensitive photoelectric device drive control circuit and display device Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
- G01J2001/4446—Type of detector
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Abstract
The invention discloses a photosensitive photoelectric device drive control circuit and a display device, wherein the circuit comprises: the common end of the switch switching circuit is connected with the anode of the photosensitive photoelectric device; the switch switching circuit has a first working state and a second working state; the output end of the photosensitive photoelectric device driving circuit is connected with the first connecting end of the switch switching circuit; the detection end of the photosensitive detection circuit is connected with the second connection end of the switch switching circuit; in a first working state, the switch switching circuit controls the photosensitive photoelectric device driving circuit to be electrically connected with the photosensitive photoelectric device so as to drive the photosensitive photoelectric device to emit light for working; and in a second working state, the switch switching circuit controls the photosensitive detection circuit to be electrically connected with the photosensitive photoelectric device so as to receive the optical signal acquired by the photosensitive photoelectric device. The invention solves the problems of high cost and complex manufacturing process of the multifunctional display screen manufactured by SIP, heterogeneous integration or monolithic integration.
Description
Technical Field
The invention relates to the technical field of photosensitive photoelectric devices, in particular to a driving control circuit of a photosensitive photoelectric device and a display device.
Background
With the development of display technology, the requirements on the display technology are higher and higher. The novel display not only needs to have a display function, but also needs to continuously expand other functions, such as the perception capability to the environment, the communication capability between the display and the like. These requirements put new demands on the conventional display technology. At present, various functional modules are generally combined together by a System In Package (SIP), heterogeneous integration or monolithic integration to meet the requirements of display technology. Such a manufacturing process is tedious, increases manufacturing costs, reduces integration, and may not achieve the desired effect.
Disclosure of Invention
The invention mainly aims to provide a drive control circuit of a photosensitive photoelectric device and a display device, and aims to solve the problems of high cost and complex manufacturing process of a multifunctional display screen.
In order to achieve the above object, the present invention provides a driving control circuit for a photosensitive optoelectronic device, including:
the common end of the switch switching circuit is connected with the anode of the photosensitive photoelectric device; the switch switching circuit has a first working state and a second working state;
the output end of the photosensitive photoelectric device driving circuit is connected with the first connecting end of the switch switching circuit;
the detection end of the photosensitive detection circuit is connected with the second connection end of the switch switching circuit;
in the first working state, the switch switching circuit controls the photosensitive photoelectric device driving circuit to be electrically connected with the photosensitive photoelectric device so as to drive the photosensitive photoelectric device to emit light for working;
and in the second working state, the switch switching circuit controls the photosensitive detection circuit to be electrically connected with the photosensitive photoelectric device so as to receive the optical signal acquired by the photosensitive photoelectric device.
Optionally, the switch switching circuit includes a first switch and a second switch, a first conductive end of the first switch is a first connection end of the switch switching circuit, and a first conductive end of the second switch is a second connection end of the switch switching circuit; and the common end of the first switch and the second switch is the common end of the switch switching circuit.
Optionally, in the first operating state, the first switch is turned on, and the second switch is turned off;
in the second working state, the second switch is turned on, and the first switch is turned off.
Optionally, the photosensitive optoelectronic device driving circuit comprises a third switch, a fourth switch and a storage capacitor, wherein a controlled terminal of the third switch is used for accessing an addressing signal, an input terminal of the third switch is accessed with a data signal, and an output terminal of the third switch is interconnected with a first terminal of the storage capacitor and a controlled terminal of the fourth switch; an input end of the fourth switch is interconnected with the second end of the storage capacitor and the first direct current power supply; and the output end of the fourth switch is the output end of the photosensitive photoelectric device driving circuit.
Optionally, the photosensitive detection circuit includes a dual-gate thin film transistor, a back gate electrode of the dual-gate thin film transistor is a detection end of the photosensitive detection circuit, a drain of the dual-gate thin film transistor is connected to the first dc power supply, a source of the dual-gate thin film transistor is grounded, and a top gate electrode of the dual-gate thin film transistor is connected to the second dc power supply.
The invention also provides a display device, which comprises a plurality of photosensitive photoelectric devices and the photosensitive photoelectric device driving control circuit;
the number of the drive control circuits of the photosensitive photoelectric devices corresponds to that of the photosensitive photoelectric devices; the common end of a switch switching circuit in the photosensitive photoelectric device driving control circuit is connected with the anode of the photosensitive photoelectric device, and the cathode of the photosensitive photoelectric device is grounded.
Optionally, the display device further comprises:
the output end of the user input circuit is connected with a photosensitive photoelectric device driving circuit in each photosensitive photoelectric device driving control circuit; and the user input circuit is used for outputting corresponding addressing signals and data signals according to the received input digital, character or character information so as to control the corresponding photosensitive photoelectric device driving circuit in the photosensitive photoelectric device driving control circuit to work.
Optionally, the display device further comprises:
the input end of the information receiving circuit is connected with a photosensitive detection circuit in each photosensitive photoelectric device driving control circuit; the information receiving circuit is used for converting the light signals obtained by the photosensitive photoelectric devices received by the photosensitive detection circuits into corresponding digital, character or character information.
Optionally, the display device further comprises:
the input end of the brightness adjusting control circuit is connected with the photosensitive detection circuit in each photosensitive photoelectric device driving control circuit, and the output end of the brightness adjusting control circuit is connected with the photosensitive photoelectric device driving circuit in each photosensitive photoelectric device driving control circuit; the brightness adjustment control circuit is used for outputting a corresponding brightness adjustment control signal according to the optical signal obtained by the photosensitive photoelectric device received by the photosensitive detection circuit, so as to control the photosensitive photoelectric device driving circuit to adjust the driving current output to the corresponding photosensitive photoelectric device.
Optionally, the display device further comprises:
the input end of the main controller is connected with the photosensitive detection circuit in each photosensitive photoelectric device driving control circuit, and the output end of the main controller is connected with the photosensitive photoelectric device driving circuit in each photosensitive photoelectric device driving control circuit; the main controller is used for determining the type of a user operation event according to the light signals obtained by the photosensitive photoelectric devices received by the photosensitive detection circuits, and controlling the photosensitive photoelectric device driving circuits in the corresponding photosensitive photoelectric device driving control circuits to work according to the type of the user operation event.
The switch switching circuit has a first working state and a second working state, wherein in the first working state, the switch switching circuit controls the photosensitive photoelectric device driving circuit to be electrically connected with the photosensitive photoelectric device, so that the photosensitive photoelectric device driving circuit controls the photosensitive photoelectric device to be switched on and lightened according to the received addressing signal and data signal, and further drives the photosensitive photoelectric device to emit light and work in a display state, and in the second working state, the switch switching circuit switches on the photosensitive detection circuit to be electrically connected with the photosensitive photoelectric device, so that the photosensitive device is in a cut-off state and works in a light detection state, generates a certain response to ambient light around the photosensitive device, generates a photo-generated voltage with a magnitude corresponding to the ambient light to the photosensitive detection circuit, and realizes the detection of the ambient light. The drive control circuit of the photosensitive photoelectric device can enable the same photosensitive photoelectric device to work in a light detection state and a display state, and various functional modules are not required to be manufactured in a system-in-package (SIP) mode, a heterogeneous integration mode or a single-chip integration mode, so that the problems of high cost and complex manufacturing process of a multifunctional display screen manufactured in the SIP (system-in-package), heterogeneous integration mode or single-chip integration mode are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of functional modules of a driving control circuit of a photosensitive optoelectronic device according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a driving control circuit of a photosensitive optoelectronic device according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of an embodiment of a driving circuit of the photosensitive optoelectronic device shown in FIG. 1;
FIG. 4 is a schematic circuit diagram of a display device according to an embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a display device according to another embodiment of the present invention;
FIG. 6 is a schematic circuit diagram of a display device according to still another embodiment of the present invention;
FIG. 7 is a graph of the transfer characteristics of the dual-gate TFT of FIG. 2 in dark state and under light;
FIG. 8 is a graph of the ratio of drain-source current under illumination and dark state versus gate voltage for the dual-gate TFT of FIG. 2;
fig. 9 is a graph of threshold voltage versus photo-generated voltage for the dual-gate tft of fig. 2.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Photosensitive |
10 | |
| 200 | Drive control circuit of photosensitive |
20 | Driving circuit of photosensitive |
| 300 | |
30 | |
| 400 | Information receiving circuit | T1～T4 | First to |
| 500 | Brightness regulating control circuit | T5 | Double-gate |
| 600 | Main controller | C1 | Storage capacitor |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The invention provides a drive control circuit of a photosensitive photoelectric device, which is used in a display device provided with a light emitting diode.
With the development of display technology, the display screen is also developed towards Light and thin, and Organic Light Emitting Diodes (OLEDs), Micro Light Emitting diodes (μ LEDs), or Light Emitting diodes called Micro LEDs, etc., especially Active Matrix Organic Light-Emitting diodes (AM-OLEDs), have been increasingly applied to display devices due to their excellent characteristics of small structure, high brightness, etc. The basis for AMOLEDs, for example, is a light emitting diode. Thousands of light sources that emit only one of the three colors red, green, or blue are placed in a particular pattern on the substrate of the screen, and these leds emit red, green, or blue when a voltage is applied. After the ratio of the three primary colors is adjusted with a Thin Film Transistor (TFT), various colors can be emitted. In display technology, the led is generally used only for emitting light, and has no other function. In practice, a light emitting diode is a simple pn or pin junction that is capable of responding to light in the presence of light. Since the active layer of the light emitting diode is thin, for example, the active layer of the organic light emitting diode is less than 50nm, and the active layer of the quantum dot light emitting diode is less than 30nm, the optical response thereof is weak. The light emitting diode does not have the function of light detection under the traditional design scheme. However, as display technology has developed, the demand for display technology has become higher and higher. The novel display not only needs to have a display function, but also needs to continuously expand other functions, such as the perception capability to the environment, the communication capability between the display and the like. These requirements put new demands on the conventional display technology. At present, various functional modules are generally combined together by a System In Package (SIP), heterogeneous integration or monolithic integration to meet the requirements of display technology. Such a manufacturing process is tedious, increases manufacturing costs, reduces integration, and may not achieve the desired effect.
Referring to fig. 1, in an embodiment of the present invention, the driving control circuit 200 of the photosensitive type photoelectric device includes:
a switch switching circuit 10, wherein the common end of the switch switching circuit 10 is connected with the anode of the photosensitive photoelectric device 100; the switch switching circuit 10 has a first operating state and a second operating state;
a photosensitive optoelectronic device driving circuit 20, an output end of which is connected to the first connection end of the switch switching circuit 10;
a photosensitive detection circuit 30, a detection end of which is connected with the second connection end of the switch switching circuit 10;
in the first working state, the switch switching circuit 10 controls the photosensitive optoelectronic device driving circuit 20 to be electrically connected with the photosensitive optoelectronic device 100, so as to drive the photosensitive optoelectronic device 100 to emit light for working;
in the second working state, the switch switching circuit 10 controls the photosensitive detection circuit 30 to be electrically connected to the photosensitive optoelectronic device 100, so as to receive the optical signal acquired by the photosensitive optoelectronic device 100.
In this embodiment, the photosensitive optoelectronic device driving circuit 20 has an address signal input terminal and a data signal input terminal, wherein the address signal input terminal is used for receiving an address signal Vselect and controlling the on/off of the light emitting diode according to the address signal Vselect. The data signal input end is used for accessing a data signal Vdata and controlling the current flowing through the light emitting diode so as to realize different gray scale display.
The photosensitive photoelectric device can be an Organic Light Emitting Diode (OLED), a quantum dot light emitting diode, a perovskite light emitting diode and a III-V group light emitting diode, the embodiment can be realized by selectively adopting the organic light emitting diode, the photosensitive photoelectric device has a display state and a light detection state, and when the photosensitive photoelectric device driving circuit 20 drives the photosensitive photoelectric device to be conducted, the photosensitive photoelectric device works in the display state to realize the light display of corresponding colors. When the photosensitive photoelectric device driving circuit 20 drives it to be turned off, the photosensitive photoelectric device works in a light detection state, so as to realize the ambient light detection around the photosensitive photoelectric device.
The switch switching circuit 10 has two working states, and in the first working state, the photosensitive optoelectronic device driving circuit 20 is connected to the photosensitive optoelectronic device 100, and at this time, the photosensitive optoelectronic device driving circuit 20 controls the photosensitive optoelectronic device to be connected and lighted according to the received addressing signal and data signal, so as to emit one of red, green or blue light. In the second working state, the photosensitive detection circuit 30 is connected to the photosensitive optoelectronic device 100, and at this time, the photosensitive optoelectronic device driving circuit 20 is not connected to the photosensitive optoelectronic device 100, and the photosensitive optoelectronic device 100 is in the cut-off state. Under the condition of light irradiation, the photosensitive photoelectric device can generate a certain response to ambient light around the photosensitive photoelectric device, so as to generate a photo-generated voltage, and the photo-generated voltage is output to the photosensitive detection circuit 30, so that the photosensitive detection circuit 30 can amplify the photo-generated voltage, thereby generating an optical signal with a size corresponding to the photo-generated voltage, and realizing the detection of the optical signal.
The switch switching circuit 10 of the present invention has a first working state and a second working state, in the first working state, the switch switching circuit 10 controls the photosensitive optoelectronic device driving circuit 20 to be electrically connected with the photosensitive optoelectronic device 100, so that the photosensitive optoelectronic device driving circuit 20 controls the photosensitive optoelectronic device to be turned on and turned on according to the received addressing signal and data signal, and further drives the photosensitive optoelectronic device 100 to emit light and work in the display state, in the second working state, the switch switching circuit 10 turns on the photosensitive detection circuit 30 to be electrically connected with the photosensitive optoelectronic device 100, so that the photosensitive device is in the off state and works in the light detection state, and generates a certain response to the ambient light around the photosensitive device, and generates a photo-generated voltage corresponding to the ambient light to the photosensitive detection circuit 30, thereby realizing the detection of the ambient light. The photosensitive photoelectric device driving control circuit 200 of the present invention can make the same photosensitive photoelectric device 100 work in the photodetection state and the display state without making various functional modules by way of System In Package (SIP), heterogeneous integration or monolithic integration, thereby solving the problems of high cost and complex manufacturing process of the multifunctional display screen made by way of SIP (system in package), heterogeneous integration or monolithic integration.
Referring to fig. 2, in an embodiment, the switch switching circuit 10 includes a first switch T1 and a second switch T2, a first conductive terminal of the first switch T1 is a first connection terminal of the switch switching circuit 10, and a first conductive terminal of the second switch T2 is a second connection terminal of the switch switching circuit 10; the common terminal of the first switch T1 and the second switch T2 is the common terminal of the switch switching circuit 10.
Wherein, in the first operating state, the first switch T1 is turned on, and the second switch T2 is turned off;
in the second operating state, the second switch T2 is turned on, and the first switch T1 is turned off.
In this embodiment, the first switch T1 and the second switch T2 can be implemented by thin film transistors, and the first switch T1 and the second switch T2 are alternatively turned on when the photosensitive optoelectronic device 100 implements the display function or the photo-detection function. That is, when the first switch T1 is turned on, the second switch T2 is turned off, whereas when the second switch T2 is turned on, the first switch T1 is turned off. Specifically, when the first switch T1 is turned on and the second switch T2 is turned off, the first switch T1 controls the photosensitive type photoelectric device driving circuit 20 to be electrically connected to the photosensitive type photoelectric device 100, and at this time, the turning off of the second switch T2 electrically disconnects the photosensitive detection circuit 30 from the photosensitive type photoelectric device 100. In this process, the photosensitive photoelectric device driving circuit 20 drives the photosensitive photoelectric device to be turned on and lighted according to the received address signal and data signal. When the second switch T2 is turned on and the first switch T1 is turned off, the second switch T2 controls the light sensing circuit 30 to be electrically connected to the light sensitive type photoelectric device 100. At this time, the turn-off of the first switch T1 electrically disconnects the photosensitive-type photoelectric device driving circuit 20 from the photosensitive-type photoelectric device 100. In this process, the photosensitive device is in an off state and operates in a light detection state, and generates a certain response to ambient light around the photosensitive device, and a photo-generated voltage with a magnitude corresponding to the ambient light is generated to the photosensitive detection circuit 30, so as to realize detection of the ambient light.
Referring to fig. 3, in an embodiment, the light-sensitive type photoelectric device driving circuit 20 includes a third switch T3, a fourth switch T4, and a storage capacitor C1, a controlled terminal of the third switch T3 being for switching in an address signal, an input terminal of the third switch T3 being for switching in a data signal, an output terminal of the third switch T3 being interconnected with a first terminal of the storage capacitor C1 and a controlled terminal of the fourth switch T4; an input terminal of the fourth switch T4 is interconnected with a second terminal of the storage capacitor C1 and a first DC power supply Vdd; the output end of the fourth switch T4 is the output end of the photosensitive optoelectronic device driving circuit 20.
In this embodiment, the driving circuit 20 of the photosensitive optoelectronic device can be implemented by a 2T1C driving circuit, the 2T1C circuit can perform the display function of the photosensitive optoelectronic device 100 by a constant current driving method, the third switch T3 is used as a switch, the capacitor 2 has a storage function of maintaining the driving state, and the fourth switch T4 is used as a driving function. The photosensitive optoelectronic device 100 is used as a display in this circuit. Specifically, the controlled terminal of the third switch T3 receives the address signal Vselect, and the third switch T3 is turned on/off according to the control of the address signal. When the third switch T3 is turned on, the data signal Vdata applied to the gate of the fourth switch T4 controls the current flowing through the photosensitive photoelectric device 100, thereby implementing different gray scale displays.
Referring to fig. 2, in an embodiment, the photosensitive detection circuit 30 includes a dual-gate thin film transistor T5, a back gate electrode of the dual-gate thin film transistor T5 is a detection terminal of the photosensitive detection circuit 30, a drain of the dual-gate thin film transistor T5 is connected to a first dc power supply, a source of the dual-gate thin film transistor T5 is grounded, and a top gate electrode of the dual-gate thin film transistor T5 is connected to a second dc power supply.
It can be understood that, the photosensitive optoelectronic device 100, such as an organic light emitting diode OLED, has a thin active layer of the light emitting diode, and the variation range of the photo-generated current under illumination is small, in order to improve the detection accuracy of the photosensitive optoelectronic device 100, the present invention fully utilizes the photo-generated voltage of the light emitting diode, and converts the variation of the photo-generated voltage into the variation of the back gate voltage of the dual-gate thin film transistor T5 by adding a dual-gate thin film transistor outside, and then converts the variation of the back gate voltage into the variation of the source-drain current (Ids) by utilizing the back gate effect, so as to realize the variation of the illumination-photo-generated voltage-drain-source current, and as the variation of the drain-source current of the dual-gate thin film transistor T5 is large, a high-sensitivity photo detection can be obtained. Specifically, under the illumination condition, the light emitting diode responds to the light signal to generate a photo-generated voltage, the photo-generated voltage is injected into a back gate electrode of the double-gate thin film transistor T5 through the switch switching circuit 10, the threshold voltage is changed due to a back gate effect, a transfer characteristic curve of the double-gate thin film transistor T5 is shifted, the photo-generated voltage is converted into drain-source current of the double-gate thin film transistor T5 to be amplified, and therefore high-sensitivity light detection is achieved.
Referring to fig. 7, fig. 7 is a graph showing transfer characteristics of the double-gate thin film transistor in a dark state and under light. In the dark state (no illumination), the characteristic curve of the dual-gate TFT is obtained by testing, as shown in the blue line part of fig. eight, where the light-generated voltage of the light-emitting diode is 0V and the threshold voltage is about-1V. When light is irradiated, the light emitting diode 4 responds to the light to generate a photo-generated voltage, the threshold voltage (about-3V) is changed due to the back gate effect, and the whole transfer curve is shifted to the left, such as the red line part of the graph eight. From the deviation part of the characteristic curve, the ratio of the drain-source current under illumination to the drain-source current under dark state can be calculated, and when the grid voltage is-1V, the ratio is the highest and is 3.73 multiplied by 107。
Referring to fig. 8, fig. 8 shows the ratio of drain-source current in light and dark states of the dual-gate tft as a function of gate voltage. As can be seen, the ratio can be up to seven orders of magnitude (3.73X 10)7) The method shows that the conversion of photogenerated voltage into the ratio of drain-source current under illumination to drain-source current under dark state has excellent photoresponse capability and can realize sensitive light detection. The gate voltage corresponding to the highest ratio is about-1V, which is close to the threshold voltage of the TFT when the back gate effect is not generated, as shown in the eighth threshold voltage in the dark state, which indicates that the light detection capability is the best when the gate voltage of the dual-gate TFT is set to-1V.
In the embodiment, the double-gate thin film transistor is added to convert photogenerated voltage into the amplification expression of source-drain current under a certain fixed gate voltage, so that the method has high-sensitivity light detection, greatly reduces the complexity and the manufacturing cost of a circuit, and opens up a new light detection mode for the difficult condition that the light response of the light-emitting diode is weak due to the fact that the thickness of an active layer is very thin. In terms of complexity and cost of manufacturing process of multifunctional devices, the photosensitive photoelectric display technology of the invention combines two functions of display and optical detection through different external driving circuits, can greatly reduce the process size of a display panel and improve the resolution ratio, and is beneficial to realizing smaller portable touchless display screens and large-scale parallel display-display optical communication.
The invention also provides a display device.
Referring to fig. 1, the display device includes a plurality of photosensitive type photoelectric devices 100 and the above-described photosensitive type photoelectric device driving control circuit 200; the detailed structure of the driving control circuit 200 of the photosensitive optoelectronic device can refer to the above embodiments, and is not described herein again; it can be understood that, because the display device of the present invention uses the photosensitive optoelectronic device driving and controlling circuit 200, embodiments of the display device of the present invention include all technical solutions of all embodiments of the photosensitive optoelectronic device driving and controlling circuit 200, and the achieved technical effects are also completely the same, and are not described herein again.
Wherein the number of the photosensitive optoelectronic device driving control circuits 200 corresponds to the number of the photosensitive optoelectronic devices 100; the common terminal of the switch switching circuit 10 in the photosensitive optoelectronic device driving control circuit 200 is connected to the anode of the photosensitive optoelectronic device 100, and the cathode of the photosensitive optoelectronic device 100 is grounded.
It is understood that the display device includes a plurality of pixels, each pixel including at least three sub-pixels emitting three colors of red, green and blue from the photosensitive optoelectronic device 100. Each photosensitive optoelectronic device 100 is correspondingly provided with a photosensitive optoelectronic device driving circuit 20 and a photosensitive detection circuit 30. The display device can be any one of a mobile phone, a smart watch, a computer, a television, a display and the like.
Referring to fig. 4, in an embodiment, the photosensitive type photoelectric device driving circuit 20 and the photosensitive detection circuit 30 may be applied to a photosensitive type photoelectric display technology for inter-screen communication. When the communication between the screens is realized, one of the two display devices is used as a display, the other display device is used as a light detector, the roles of the two display devices and the light detector can be interchanged, and when the communication between the screens is actually applied, the display and the light detector are oppositely arranged close to each other at a certain distance, so that the information can be transmitted and received. In a display device as a display, the switch switching circuit 10 operates in a first operation state. In the display device as a photodetector, the switch switching circuit 10 operates in the second operation state. In a display device as a display, the display device further includes:
a user input circuit 300, the output end of which is connected to the photosensitive optoelectronic device driving circuit 20 in each photosensitive optoelectronic device driving control circuit 200; the user input circuit 300 is configured to output corresponding addressing signals and data signals according to the received input digital, text or character information, so as to control the operation of the photosensitive optoelectronic device driving circuit 20 in the corresponding photosensitive optoelectronic device driving control circuit 200.
In this embodiment, the user input circuit 300 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the display device. In particular, the user input circuit 300 may include a touch panel as well as other input devices. The touch panel, also called a touch screen, may collect touch operations of a user (for example, operations of the user on or near the touch panel using any suitable object or accessory such as a finger, a stylus, etc.) and drive the corresponding connection device according to a preset program. The touch panel may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch detection device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor of the display device, and can receive and execute commands sent by the processor of the display device. In addition, the touch panel may be implemented in various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to touch panels, the user input circuitry 300 may include other input devices. In particular, the other input devices may include, but are not limited to, one or more of a physical keyboard, a function key (such as a volume control key, a switch key, etc.), a trackball, a mouse, a joystick, and the like, which are not limited herein. The user input circuit 300 can output the digital, text or character information input by the user to the processor of the display device, the processor converts the input digital, text or character information into an addressing signal and a data signal, and outputs the addressing signal and the data signal to the corresponding photosensitive photoelectric device driving circuit 20, and the photosensitive photoelectric device driving circuit 20 drives the corresponding photosensitive light emitting device to light up according to the received addressing signal and data signal when the switch switching circuit 10 works in the first working state, so as to display the digital, text or character information input by the user.
The user input circuit 300 may also directly convert the digital, text or character information inputted by the user into ASCII code, and then convert the ASCII code into high and low levels of the addressing signal and the data signal by the analog-to-digital converter, and the high and low levels of the addressing signal and the data signal are amplified by the amplifier and then output to the photosensitive optoelectronic device driving circuit, so that the photosensitive optoelectronic device driving circuit 20 drives the corresponding photosensitive light emitting device to light up, thereby implementing the display of the digital, text or character information inputted by the user and the inter-screen communication.
Referring to fig. 4, in the display device as a photodetector, the display device further includes:
an information receiving circuit 400, the input end of which is connected with the photosensitive detection circuit 30 in each photosensitive type photoelectric device driving control circuit 200; the information receiving circuit 400 is configured to convert the optical signals obtained by the photosensitive photoelectric devices 100 received by each photosensitive detection circuit 30 into corresponding digital, text, or character information.
In this embodiment, the switch switching circuit 10 in the display device as the optical detector operates in the second operating state, at which the photosensitive light emitting device is in the off state, when the display device as the display approaches, the photosensitive light emitting device can sense the information of the numbers, characters or characters displayed on the display device as the display and generate the photo-generated voltage, and the photosensitive detection circuit 30 amplifies the photo-generated voltage and generates the optical signal having the magnitude corresponding to the photo-generated voltage. After receiving the optical signal at the high and low levels, the information receiving circuit 400 performs an analog-to-digital converter to convert the high and low levels into ASCII codes, and then converts the ASCII codes into digital, text, or character information, so that on-screen communication between the display device serving as the display and the display device serving as the optical detector can be realized. It can be understood that, both the display device as a display and the display device as a photo detector are integrated with the information receiving circuit 400 and the user input circuit 300, when transmitting information, the switch switching circuit 10 is only required to be controlled to switch on the electrical connection between the photosensitive optoelectronic device driving circuit 20 and the photosensitive optoelectronic device 100 or switch on the electrical connection between the photosensitive detection circuit 30 and the photosensitive optoelectronic device 100, so that the photosensitive optoelectronic device 100 in one display operates in the display state and the photosensitive optoelectronic device 100 in the other display operates in the photo detection state, thereby establishing an optical communication system.
Referring to fig. 5, in an embodiment, the display device further includes:
a brightness adjustment control circuit 500, the input end of which is connected to the photosensitive detection circuit 30 in each photosensitive optoelectronic device driving control circuit 200, and the output end of the brightness adjustment control circuit 500 is connected to the photosensitive optoelectronic device driving circuit 20 in each photosensitive optoelectronic device driving control circuit 200; the brightness adjustment control circuit 500 is configured to output a corresponding brightness adjustment control signal according to an optical signal obtained by the photosensitive optoelectronic device 100 received by the photosensitive detection circuit 30, so as to control the photosensitive optoelectronic device driving circuit 20 to adjust the driving current output to the corresponding photosensitive optoelectronic device 100.
In this embodiment, the photosensitive optoelectronic device 100 is switched between the display state and the photo-detection state by controlling the switching frequency of the switch switching circuit 10, so that the photosensitive optoelectronic device 100 is turned off to detect the ambient light, and the photosensitive detection circuit 30 feeds back the optical signal to the luminance adjustment control circuit 500, thereby controlling the photosensitive optoelectronic device driving circuit 20 to adjust the driving current output to the photosensitive optoelectronic device 100. When the switch switching circuit 10 switches the photosensitive optoelectronic device 100 to be on, the brightness of the photosensitive optoelectronic device 100 is adjusted, so as to adjust the brightness of the display device. For example, in an environment of strong light, the photosensitive optoelectronic device 100 responds to a strong light signal to generate a high photo-generated voltage, and due to a back gate effect, a drop amplitude of a threshold voltage becomes large, so that a leftward offset of a TFT characteristic curve is increased, and a drain-source current amplification factor is increased. The photo-generated voltage is amplified by the photosensitive detection circuit 30 and then output to the brightness adjustment control circuit 500, so that the brightness adjustment control circuit 500 controls the photosensitive optoelectronic device driving circuit 20 to reduce the gate voltage of the thin film transistor, thereby reducing the driving current of the light emitting diode and reducing the display brightness of the light emitting diode. Under the environment of weak light, the brightness adjustment control circuit 500 controls the photosensitive optoelectronic device driving circuit 20 to increase the gate voltage of the thin film transistor, thereby increasing the driving current of the light emitting diode, so that the display brightness of the light emitting diode is increased, and the display screen automatically increases the display brightness. According to the photosensitive photoelectric display technology, each pixel point in the display screen can sense the intensity of ambient light and automatically adjust the displayed brightness, a light sensor is not required to be additionally arranged, after a light signal sensed by the photosensitive photoelectric device 100 is output to the photosensitive detection circuit 30, the photosensitive detection circuit 30 outputs to the brightness adjustment control circuit 500, the brightness of the photosensitive photoelectric device 100 can be directly adjusted, and the brightness adjustment speed of the display screen is improved.
Referring to fig. 9, fig. 9 is a graph of threshold voltage variation with photogenerated voltage of the dual-gate thin film transistor, and different photogenerated voltages generated by the photosensitive optoelectronic device 100 are applied to the back gate electrode of the TFT under different luminances to observe the characteristic curve deviation condition and the threshold voltage variation process of the TFT. It is seen from the figure that, in the process of gradually increasing the photogenerated voltage from 0 to 1.8V, the threshold voltage of the photogenerated voltage is gradually reduced along with the enhancement of the back gate effect, and the whole TFT characteristic transfer curve gradually shifts to the left, that is, under the same gate voltage, the larger the photogenerated voltage generated by different light intensities is, the larger the ratio of the drain-source current under illumination to the drain-source current under dark state is, the higher the photoresponse sensitivity is, and the better the photodetection capability is.
Referring to fig. 6, in an embodiment, the display device further includes:
the input end of the main controller 600 is connected with the photosensitive detection circuit 30 in each photosensitive photoelectric device driving control circuit 200, and the output end of the main controller 600 is connected with the photosensitive photoelectric device driving circuit 20 in each photosensitive photoelectric device driving control circuit 200; the main controller 600 is configured to determine the type of a user operation event according to the optical signal obtained by the photosensitive optoelectronic device 100 received by each photosensitive detection circuit 30, and control the photosensitive optoelectronic device driving circuit 20 in the photosensitive optoelectronic device driving control circuit 200 to operate according to the type of the user operation event.
In this embodiment, the main controller 600 may be a control center of the display device, and various interfaces and lines are used to connect various parts of the whole display device, and the display device may further be provided with a memory, and perform various functions of the display device and process data by running or executing software programs and/or modules stored in the memory and calling data stored in the memory, thereby performing overall monitoring on the display device. The main controller 600 may include one or more processing units; preferably, the main controller 600 may integrate an application processor, which mainly handles an operating system, a user interface, application programs, etc., and a modem processor, which mainly handles wireless communication. When the display device is in operation, the photosensitive optoelectronic device driving circuit 20 drives the photosensitive optoelectronic device 100 to light up to emit light with corresponding color and brightness. When a finger is close to a display screen (no touch exists), because the finger shields the display screen and part of light is absorbed by skin, the light becomes dark and a shadow is left on a local corresponding pixel, the pixel responds to weak light, a weaker photogenerated voltage is generated, the back gate effect is weakened, the leftward offset of a TFT characteristic curve is reduced, and the drain-source current amplification factor is reduced. The photosensitive photoelectric device 100 is switched between the display state and the optical detection state by controlling the switching frequency of the switch switching circuit 10, so that the photosensitive photoelectric device 100 is cut off to realize the detection of the ambient light, the photosensitive detection circuit 30 feeds back the optical signal to the main controller 600(CPU), the main controller 600 determines the type of the user operation event according to the received optical signal, and controls the photosensitive photoelectric device driving circuit 20 in the corresponding photosensitive photoelectric device driving control circuit 200 to work according to the type of the user operation event, so as to perform signal processing and control the information update of the display screen, thereby realizing the effect of touch-free display.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A drive control circuit for a photosensitive type photoelectric device, comprising:
the common end of the switch switching circuit is connected with the anode of the photosensitive photoelectric device; the switch switching circuit has a first working state and a second working state;
the output end of the photosensitive photoelectric device driving circuit is connected with the first connecting end of the switch switching circuit;
the detection end of the photosensitive detection circuit is connected with the second connection end of the switch switching circuit;
in the first working state, the switch switching circuit controls the photosensitive photoelectric device driving circuit to be electrically connected with the photosensitive photoelectric device so as to drive the photosensitive photoelectric device to emit light for working;
in the second working state, the switch switching circuit controls the photosensitive detection circuit to be electrically connected with the photosensitive photoelectric device so as to receive an optical signal acquired by the photosensitive photoelectric device;
the photosensitive detection circuit comprises a double-gate thin film transistor, a back gate electrode of the double-gate thin film transistor is a detection end of the photosensitive detection circuit, a drain electrode of the double-gate thin film transistor is connected with a first direct-current power supply, a source electrode of the double-gate thin film transistor is grounded, and a top gate electrode of the double-gate thin film transistor is connected with a second direct-current power supply.
2. The driving control circuit for a photosensitive optoelectronic device according to claim 1, wherein the switch switching circuit comprises a first switch and a second switch, the first conductive terminal of the first switch is the first connection terminal of the switch switching circuit, and the first conductive terminal of the second switch is the second connection terminal of the switch switching circuit; and the common end of the first switch and the second switch is the common end of the switch switching circuit.
3. The drive control circuit for a photosensitive optoelectronic device according to claim 2, wherein in said first operating state, said first switch is turned on and said second switch is turned off;
in the second working state, the second switch is turned on, and the first switch is turned off.
4. The photosensitive optoelectronic device driver control circuit according to claim 1, wherein the photosensitive optoelectronic device driver circuit comprises a third switch, a fourth switch and a storage capacitor, wherein a controlled terminal of the third switch is configured to access an addressing signal, an input terminal of the third switch is configured to access a data signal, and an output terminal of the third switch is interconnected with a first terminal of the storage capacitor and a controlled terminal of the fourth switch; an input end of the fourth switch is interconnected with the second end of the storage capacitor and the first direct current power supply; and the output end of the fourth switch is the output end of the photosensitive photoelectric device driving circuit.
5. A display device comprising a plurality of photosensitive type photoelectric devices and the photosensitive type photoelectric device drive control circuit according to any one of claims 1 to 4;
the number of the drive control circuits of the photosensitive photoelectric devices corresponds to that of the photosensitive photoelectric devices; the common end of a switch switching circuit in the photosensitive photoelectric device driving control circuit is connected with the anode of the photosensitive photoelectric device, and the cathode of the photosensitive photoelectric device is grounded.
6. The display device of claim 5, further comprising:
the output end of the user input circuit is connected with a photosensitive photoelectric device driving circuit in each photosensitive photoelectric device driving control circuit; and the user input circuit is used for outputting corresponding addressing signals and data signals according to the received input digital, character or character information so as to control the corresponding photosensitive photoelectric device driving circuit in the photosensitive photoelectric device driving control circuit to work.
7. The display device of claim 5, further comprising:
the input end of the information receiving circuit is connected with a photosensitive detection circuit in each photosensitive photoelectric device driving control circuit; the information receiving circuit is used for converting the light signals obtained by the photosensitive photoelectric devices received by the photosensitive detection circuits into corresponding digital, character or character information.
8. The display device of claim 5, further comprising:
the input end of the brightness adjusting control circuit is connected with the photosensitive detection circuit in each photosensitive photoelectric device driving control circuit, and the output end of the brightness adjusting control circuit is connected with the photosensitive photoelectric device driving circuit in each photosensitive photoelectric device driving control circuit; the brightness adjustment control circuit is used for outputting a corresponding brightness adjustment control signal according to the optical signal obtained by the photosensitive photoelectric device received by the photosensitive detection circuit, so as to control the photosensitive photoelectric device driving circuit to adjust the driving current output to the corresponding photosensitive photoelectric device.
9. The display device according to any one of claims 5 to 8, wherein the display device further comprises:
the input end of the main controller is connected with the photosensitive detection circuit in each photosensitive photoelectric device driving control circuit, and the output end of the main controller is connected with the photosensitive photoelectric device driving circuit in each photosensitive photoelectric device driving control circuit; the main controller is used for determining the type of a user operation event according to the light signals obtained by the photosensitive photoelectric devices received by the photosensitive detection circuits, and controlling the photosensitive photoelectric device driving circuits in the corresponding photosensitive photoelectric device driving control circuits to work according to the type of the user operation event.
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