CN110580878A - Pixel circuit - Google Patents
Pixel circuit Download PDFInfo
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- CN110580878A CN110580878A CN201910994018.0A CN201910994018A CN110580878A CN 110580878 A CN110580878 A CN 110580878A CN 201910994018 A CN201910994018 A CN 201910994018A CN 110580878 A CN110580878 A CN 110580878A
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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]
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The application discloses a pixel circuit which is used for driving a light emitting diode. The pixel circuit comprises a voltage selector, a capacitor, a voltage reset, a driving stage circuit and a voltage transmitter. The voltage selector selects the first reference voltage or the data voltage to generate a selection voltage according to the laser control signal and the first scanning signal. The first terminal of the capacitor receives a selection voltage. The voltage resetter provides a second reference voltage to the first end and the second end of the capacitor according to a second scanning signal. The driving stage circuit drives the light emitting diode according to the voltage on the second end of the capacitor and the laser control signal. The voltage transmitter provides a voltage transmission path between the second end of the capacitor and the driving stage circuit according to the first scanning signal.
Description
Technical Field
The present invention relates to a pixel circuit, and more particularly, to a pixel circuit of a light emitting diode.
Background
With the evolution of electronic technology, consumer electronics are becoming an important tool for people to have in daily life. It is becoming an important trend to provide high performance display devices for consumer electronics.
In the present technology field, display devices constructed by using light emitting diodes are becoming more and more popular. In the pixel circuit for driving the light emitting diode, the driving transistor has a problem of variation in electrical characteristics over a long period of time or during the manufacturing process, and therefore how to provide a driving current with high uniformity in the pixel circuit is an important factor for the display quality of the image display device. In addition, how to reduce the power consumption of the display device and improve the contrast of the display screen is an important issue for those skilled in the art.
Disclosure of Invention
The present invention provides a pixel circuit, which can reduce the possible reset current and the generated driving current is operated in a gradually decreasing mode in each frame time period.
the pixel circuit of the invention is used for driving the light emitting diode. The pixel circuit comprises a voltage selector, a capacitor, a voltage reset, a driving stage circuit and a voltage transmitter. The voltage selector selects the first reference voltage or the data voltage to generate a selection voltage according to the laser control signal and the first scanning signal. The first terminal of the capacitor is coupled to the voltage selector to receive a selection voltage. The voltage resetter is coupled to the first end and the second end of the capacitor and provides a second reference voltage according to a second scanning signal. The driving stage circuit is coupled to the capacitor and the light emitting diode, and drives the light emitting diode according to the voltage at the second end of the capacitor and the laser control signal. The voltage transmitter is coupled to the second terminal of the capacitor and the driving stage circuit, and provides a voltage transmission path between the second terminal of the capacitor and the driving stage circuit according to a first scan signal.
in view of the above, the pixel circuit of the present invention is configured by disposing the voltage resetter at the two ends of the capacitor. The voltage resetter is used for resetting the voltage at two ends of the capacitor to the same voltage in an initial time interval, thereby reducing the reset current generated when the pixel circuit does not light the light-emitting diode and reducing the power consumption. In addition, in an embodiment of the invention, when the pixel circuit operates in the laser time interval, the voltage resetter and the voltage transmitter provide a leakage current in a direction opposite to the second end of the capacitor, and the residual leakage current after the elimination gradually reduces the driving voltage of the transistor providing the driving current, so that the display image can be gradually darkened in one laser time interval, thereby ensuring the low-brightness image quality and improving the image contrast of the display device.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
drawings
Fig. 1 shows a schematic diagram of a pixel circuit according to an embodiment of the invention.
Fig. 2 is a circuit diagram of a pixel circuit according to another embodiment of the present invention.
Fig. 3 is a waveform diagram showing an operation of the pixel circuit according to the embodiment of the present invention.
Fig. 4 shows a circuit diagram of a pixel circuit according to another embodiment of the invention.
Fig. 5 is a waveform diagram showing an operation of the pixel circuit according to the embodiment of the present invention.
The reference numerals are explained below:
100. 200, 400: pixel circuit
LED: light emitting diode
110. 210, 410: voltage selector
CST: capacitor with a capacitor element
120. 220, 420: voltage reset device
140. 240, 440: driving stage circuit
130. 230, 430: voltage transmitter
EM [ N ]: laser control signal
Scan [ N ], Scan [ N-1], Scan [ N +1 ]: scanning signal
VREF、VREF1: reference voltage
VDATA: data voltage
VSEL: selection voltage
OVDD: supply voltage
OVSS: reference ground voltage
T1-T8: transistor with a metal gate electrode
Clk 1-Clk 3: clock signal
TR: resetting a time interval
TDIN: data write time interval
TEM: laser time interval
Detailed Description
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a pixel circuit according to an embodiment of the invention. In the present embodiment, the pixel circuit 100 is used to drive the light emitting diode LED. The pixel circuit 100 includes a voltage selector 110 and a capacitor CSTA voltage resetter 120, a driving stage circuit 140 and a voltage transmitter 130. The voltage selector 110 is based on the laser control signal EM [ N ]]and a Scan signal Scan [ N ]]To select the reference voltage VREFOr data voltage VDATAto generate the select voltage VSEL. The voltage selector 110 is coupled to the capacitor CSTAnd a select voltage VSEL is supplied to the capacitor CSTThe first end of (a). The voltage resetter 120 is coupled to the capacitor CSTAnd a second end. The voltage resetter 120 receives the Scan signal Scan [ N-1]]To provide a reference voltage VREF1. The voltage resetter 120 is controlled by the Scan signal Scan [ N-1]]To provide a reference voltage VREF1To a capacitor CSTAnd a second end. The driving stage circuit 140 is coupled to the capacitor CSTAnd a Light Emitting Diode (LED) according to the capacitance CSTAnd a voltage on the second terminal of the laser and a laser control signal EM [ N ]]To drive the light emitting diode LED. In the present embodiment, the driving stage circuit 140 receives the power supply voltage OVDD and is based on the laser control signal EM [ N ]]Is enabled. The driving stage circuit 140 is based on the capacitor CSTto generate a driving current to drive the light emitting diode LED.
In addition, the voltage transmitter 130 is coupled to the capacitor CSTAnd the driver stage circuit 140. The voltage transmitter 130 receives the Scan signal Scan [ N ]]And according to the Scan signal Scan [ N ]]To be on the capacitor CSTA voltage transmission path is provided between the second terminal and the driving stage circuit 140. Wherein, when the voltage transmission path is formed, the driving stage circuit 140 can provide the power supply voltage OVDD to the capacitor through the voltage transmission pathCSTThe second end of (a).
In addition, the anode of the LED is coupled to the driving stage 140, and the cathode of the LED receives the ground reference voltage OVSS.
in operation details, the voltage resetter 120 enables the capacitor C to reset during a reset time interval of an initial time intervalSTThe voltage on the first end and the voltage on the second end are both equal to the reference voltage VREF1. Then, in a data writing time interval, the voltage selector 110 is based on the Scan signal Scan [ N ]]To select the data voltage VDATATo generate a selection voltage VSEL, and to supply the selection voltage VSEL to the capacitor CSTThe first end of (a). At the same time, the voltage transmitter 130 is also based on the Scan signal Scan [ N ]]To provide a voltage transmission path to make the capacitor CSTThe second terminal of the power supply is charged according to the power supply voltage OVDD. Thus, the capacitance CSTIs equal to the data voltage VDATACapacitor CSTIs equal to the supply voltage OVDD minus the turn-on voltage V of the transmission channelTH。
Incidentally, at the same time, the voltage resetter 120 stops providing the reference voltage VREF1To a capacitor CSTAt both ends of the same.
Then, in the laser time interval, the voltage selector 110 is based on the laser control signal EM [ N ]]To select the reference voltage VREFTo generate the select voltage VSEL. At this time, the capacitance CSTIs equal to the reference voltage VREFCapacitor CSTIs then equal to OVDD-VTH+VREF–VDATA. In response, the driver stage circuit 140 drives the laser control signal EM [ N ]]Is enabled according to the capacitance CSTTo generate a driving current to drive the light emitting diode LED. On the premise that the driving stage circuit 140 generates the driving current through the transistor operating in the saturation region, the magnitude of the driving current can be determined according to the data voltage VDATAAnd a reference voltage VREFIs determined by the difference of (a).
Incidentally, in the embodiment of the invention, if the pixel circuit 100 is one of the pixel circuits disposed in multiple stages of the display panel, the Scan signal Scan [ N ] is a Scan signal for scanning the pixel circuit 100, and the Scan signal Scan [ N-1] may be a Scan signal for scanning a previous stage of the pixel circuit. The Scan signal Scan [ N-1] and the Scan signal Scan [ N ] can be enabled sequentially, and the enabled times of the Scan signal Scan [ N ] and the second Scan signal are not overlapped.
For details of the implementation of the present invention, please refer to fig. 2 for a circuit diagram of a pixel circuit according to another embodiment of the present invention. The pixel circuit 200 includes a voltage selector 210 and a capacitor CSTa voltage resetter 220, a driving stage circuit 240, a voltage transmitter 230, and a transistor T8 for forming a diode. In the present embodiment, the voltage selector 210 includes transistors T1, T2. The first terminal of the transistor T1 receives a reference voltage VREFThe control terminal of the transistor T1 receives the laser control signal EM [ N ]]. A first terminal of the transistor T is coupled to a second terminal of the transistor T1 for providing a selection voltage VSEL, and a second terminal of the transistor T2 receives a data voltage VDATAThe control terminal of the transistor T2 receives the Scan signal Scan [ N ]]. Wherein one of the transistors T1 and T2 can be controlled according to the laser control signal EM [ N ]]Or the Scan signal Scan [ N ]]Is turned on and provides a receiving reference voltage VREFOr data voltage VDATAAs the select voltage VSEL.
In addition, the voltage resetter 220 includes transistors T3 and T4. A first terminal of the transistor T3 is coupled to the capacitor CSTA control terminal of the transistor T3 receives the Scan signal Scan N-1]And the second terminal of the transistor T3 receives the reference voltage. In the present embodiment, the reference voltage received by the second terminal of the transistor T3 is the power supply voltage OVDD. A first terminal of the transistor T4 is coupled to the capacitor CSTA control terminal of the transistor T4 receives the Scan signal Scan [ N-1]]The second terminal of the transistor T4 receives the supply voltage OVDD as the reference voltage.
In the present embodiment, the transistors T3 and T4 can be driven by the Scan signal Scan [ N-1]]And is simultaneously turned on. Transistors T3, T4, when turned on, supply voltage OVDD to capacitor CSTTo both endpoints of resetCapacitor CSTThe voltage at the two terminals.
In the present embodiment, the voltage transmitter 230 includes a transistor T51、T52. Transistor T52Is coupled to the capacitor CSTThe second terminal of (1), the transistor T51The control terminal receives the Scan signal Scan [ N ]]. Transistor T52Is coupled to the transistor T51The second terminal of (1), the transistor T52The control terminal receives the Scan signal Scan [ N ]]A second transistor T52And a second terminal coupled to the driver stage circuit 240. Regarding the driving stage circuit 240, the driving stage circuit 240 includes transistors T6 and T7. A first terminal of the transistor T6 receives the supply voltage OVDD, and a control terminal of the transistor T6 is coupled to the capacitor CSTAnd a second terminal of the transistor T6 is coupled to the voltage transmitter 230. The first terminal of the transistor T7 is coupled to the second terminal of the transistor T6, and the control terminal of the transistor T7 receives the laser control signal EM [ N ]]And the second terminal of the transistor T7 is coupled to the light emitting diode LED.
Transistor T5 in voltage transmitter 2301、T52can be based on the Scan signal Scan [ N ]]And is simultaneously turned on and forms a voltage transmission channel. The voltage transmission path formed by the voltage transmitter 230 through the transistor T6 enables the power supply voltage OVDD to be transmitted to the capacitor CSTAnd to the capacitor CSTThe second terminal of (a) is charged. On the other hand, when the transistor T7 is in response to the laser control signal EM [ N ]]When turned on, the transistor T6 depends on the capacitance CSTThe voltage on the second end of the driving circuit generates a driving current, and the driving current drives the light emitting diode LED to emit light.
In the present embodiment, the anode of the light emitting diode LED is coupled to the transistor T8. The transistor T8 is coupled in a diode configuration. The first terminal of the transistor T8 is coupled to the anode of the LED, and the second terminal of the transistor T8 is coupled to each other and receives the Scan signal Scan [ N +1] as a reference signal. In this embodiment, the Scan signal S1[ N +1] can be the next-level Scan signal corresponding to the Scan signal Scan [ N ].
in operation timing, please refer to fig. 2 and fig. 3 synchronously, wherein fig. 3 shows operation waveform diagrams of the pixel circuit according to the embodiment of the invention. In FIG. 3, the Scan signals Scan [ N-1], Scan [ N ] and Scan [ N +1] can be generated according to the clock signals Clk1 Clk3, wherein the clock signals Clk2 and Clk3 can be generated by sequentially delaying the clock signal Clk 1.
In operation details, in the reset time interval TR for initializing the pixel circuit 200, the transistors T3, T4 of the voltage resetter 230 are simultaneously enabled (e.g., at a low voltage level) according to the Scan signal Scan [ N-1]]And is turned on. And make the capacitor CSTthe voltages at both ends are equal to the supply voltage OVDD. At the same time, the other transistors T1 to T2, T5 in the pixel circuit 2001、T52T7-T8 are all disconnected. Then, in the data writing time interval TDIN, the transistors T3 and T4 are turned off, and the transistor T2 of the voltage selector 210 is turned on according to the Scan signal Scan [ N ] enabled (e.g., at a low voltage level)]Is turned on and selects the data voltage VDATATo select voltage VSEL, and to apply data voltage VDATAWriting into the capacitor CSTThe first end of (a). And, the transistor T5 in the voltage transmitter 2301、T52According to the Scan signal Scan [ N ]]Is turned on and provides a voltage transmission path to make the capacitor CSTThe second terminal of the capacitor is charged according to the power supply voltage OVDD and the capacitor C is chargedSTIs equal to OVDD-VTHT6 |. Wherein | VTHAnd _t6| is the absolute value of the turn-on voltage of transistor T6.
Then, in the laser time interval TEM, the transistor T8 is first driven by the Scan signal Scan [ n +1]]Is turned on and the anode of the LED is maintained at a relatively low voltage level. Then, the transistor T8 is turned off, and the transistor T1 of the voltage selector 210 is turned off according to the laser control signal EM [ N ]]Is turned on (the transistor T2 is turned off), the voltage selector 210 changes the selection reference voltage VREFTo be used as a selection voltage VSEL and to reference a voltage VREFIs provided to a capacitor CSTThe first end of (a). Based on a capacitor CSTcoupling effect of, capacitor CSTWill change to OVDD- | VTH _ T6| + V synchronouslyREF-VDATA. Therefore, the transistor T6 depends on the capacitance CSTCan generate a bias voltage equal toThe drive current of (1). Wherein VA is capacitance CSTThe voltage at the second terminal of (a).
as can be understood from the above description, in the laser time interval TEM, the driving current generated by the pixel circuit 200 is only equal to the data voltage VDATAAnd a reference voltage VREFAnd (4) correlating. In this way, the brightness of the LED does not change with the drift of the on-voltage of the transistor T6.
It is worth mentioning that in the laser time interval TEM, the transistors T3, T4, T51、T52Are both in an off state, and during this time period, the leakage current generated by the transistors T3 and T4 can be larger than that generated by the transistor T51、T52Resulting in leakage current. Therefore, also the capacitance CSTMay be boosted and the current value of the drive current that may be generated may be reduced. Therefore, when the light emitting diode LED generates a low-brightness image, preferable brightness control can be obtained and the stability of the current passing through the light emitting diode LED can be improved. In low frame frequency (frame rate) applications, there is a preferred degree of representation.
Incidentally, the power supply voltage OVDD received in the voltage resetter 220 may be replaced by a reference voltage (e.g., the reference voltage VREF1 shown in fig. 1) with other voltage values, thereby improving the control capability of the leakage current.
In the present embodiment, the transistors T1-T8 can be implemented by P-type transistors.
Referring to fig. 4, fig. 4 is a circuit diagram of a pixel circuit according to another embodiment of the invention. The pixel circuit 400 includes a voltage selector 410, a capacitor CSTThe voltage level shifter 420, the driving stage circuit 440, the voltage transmitter 430, and the transistor T8. Unlike the embodiment of fig. 2, the transistors T1-T8 in the pixel circuit 400 are all N-type transistors. The light emitting diode LED is coupled to the driving stage circuit 440 to emit lightAnd a power supply voltage OVDD.
The operation waveform of the pixel circuit 400 can be referred to the operation waveform diagram of the pixel circuit according to the embodiment of the present invention shown in fig. 5. Unlike fig. 3, in the operation waveform of the pixel circuit 400, the Scan signals Scan [ N-1], Scan [ N ], and Scan [ N +1], and the laser control signal EM [ N ] are all enabled at a high voltage level. In terms of operation details and operation timing, the present embodiment is similar to the operation details of the embodiments of fig. 2 and fig. 3, and is not repeated herein.
In the present embodiment, the voltage resetter 420 receives the reference voltage VREF2And by providing a reference voltage V during a reset time intervalREF2To the capacitance CSTThe voltage at both ends of the capacitor is reset. Reference voltage VREF2Any voltage value can be set.
In summary, the voltage resetter resets the voltages at the two ends of the capacitor to the same voltage value during the reset time interval, and compensates the turn-on voltage of the driving transistor during the data write time interval. In addition, in the laser time interval, the leakage current generated by the voltage resetter is larger than the leakage current generated by the voltage transmitter, so that the voltage at the second end of the capacitor can be increased, and the driving current generated by the driving stage circuit can be reduced. Therefore, the brightness control capability of the light emitting diode in low-brightness display can be improved, and the light emitting diode has preferable expression degree in the application of low picture frame frequency.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (18)
1. A pixel circuit for driving a light emitting diode, comprising:
A voltage selector for selecting a first reference voltage or a data voltage to generate a selection voltage according to a laser control signal and a first scanning signal;
A capacitor, a first end of the capacitor is coupled to the voltage selector, and the first end of the capacitor receives the selection voltage;
A voltage resetter coupled to the first and second ends of the capacitor for providing a second reference voltage to the first and second ends of the capacitor according to a second scan signal;
A driving stage circuit coupled to the capacitor and the light emitting diode for driving the light emitting diode according to the voltage at the second end of the capacitor and the laser control signal; and
And the voltage transmitter is coupled between the second end of the capacitor and the driving stage circuit and provides a voltage transmission path between the second end of the capacitor and the driving stage circuit according to the first scanning signal.
2. the pixel circuit of claim 1, wherein the voltage resetter causes the voltage at the first and second terminals of the capacitor to be equal to the second reference voltage during a reset time interval.
3. The pixel circuit according to claim 2, wherein the voltage selector selects the data voltage according to the first scan signal to generate the selection voltage during a data writing time interval, and the voltage transmitter provides the voltage transmission path to charge the second terminal of the capacitor according to a power voltage.
4. The pixel circuit of claim 3, wherein the voltage selector selects the first reference voltage to generate the selection voltage according to the laser control signal, and the driving stage circuit generates a driving current to drive the light emitting diode according to the laser control signal and the voltage at the second end of the capacitor during a laser time interval.
5. The pixel circuit of claim 4, wherein the voltage resetter stops the second reference voltage from being applied to the first terminal and the second terminal of the capacitor during the data writing time interval and the laser time interval.
6. The pixel circuit of claim 4, wherein the voltage transmitter cuts off the voltage transmission path during the reset time interval and the laser time interval.
7. A pixel circuit as claimed in claim 4, wherein the second reference voltage is equal to the power supply voltage.
8. The pixel circuit according to claim 4, wherein the second scan signal and the first scan signal are enabled sequentially, and enabled times of the first scan signal and the second scan signal are not overlapped.
9. The pixel circuit of claim 1, wherein the voltage selector comprises:
A first transistor, a first end of the first transistor receiving the first reference voltage, a control end of the first transistor receiving the laser control signal;
A second transistor, a first terminal of which is coupled to a second terminal of the first transistor and is used for providing the selection voltage, a second terminal of which receives the data voltage, and a control terminal of which receives the first scan signal.
10. The pixel circuit of claim 1, wherein the voltage reset comprises:
A first transistor, a first terminal of which is coupled to the first terminal of the capacitor, a control terminal of which receives the second scan signal, and a second terminal of which receives the second reference voltage; and
A second transistor, wherein a first terminal of the second transistor is coupled to a second terminal of the capacitor, a control terminal of the second transistor receives the second scan signal, and a second terminal of the second transistor receives the second reference voltage.
11. A pixel circuit as claimed in claim 1, wherein the voltage transmitter comprises:
A first transistor, a first terminal of which is coupled to the second terminal of the capacitor, and a control terminal of which receives the first scan signal; and
And a second transistor, wherein a first terminal of the second transistor is coupled to a second terminal of the first transistor, a control terminal of the second transistor receives the first scan signal, and a second terminal of the second transistor is coupled to the driving stage circuit.
12. The pixel circuit according to claim 11, wherein the first transistor and the second transistor are turned on simultaneously according to the first scan signal and are configured to provide the voltage transmission path.
13. a pixel circuit as claimed in claim 1, wherein the driver stage circuit comprises:
A first transistor, a first terminal of which receives a power voltage, a control terminal of which is coupled to a second terminal of the capacitor, and a second terminal of which is coupled to the voltage transmitter; and
And a second transistor, wherein a first terminal of the second transistor is coupled to a second terminal of the first transistor, a control terminal of the second transistor receives the laser control signal, and a second terminal of the second transistor is coupled to the light emitting diode.
14. The pixel circuit according to claim 13, wherein the first transistor and the second transistor are P-type transistors, and a second terminal of the second transistor is coupled to an anode of the light emitting diode.
15. The pixel circuit according to claim 13, further comprising:
and the anode of the diode receives a reference signal, and the cathode of the diode is coupled to the second end of the second transistor.
16. A pixel circuit as claimed in claim 1, wherein the driver stage circuit comprises:
A first transistor, a first terminal of which receives a reference ground voltage, a control terminal of which is coupled to a second terminal of the capacitor, and a second terminal of which is coupled to the voltage transmitter; and
And a second transistor, wherein a first terminal of the second transistor is coupled to a second terminal of the first transistor, a control terminal of the second transistor receives the laser control signal, and a second terminal of the second transistor is coupled to the light emitting diode.
17. The pixel circuit according to claim 16, wherein the first transistor and the second transistor are N-type transistors, and a second terminal of the second transistor is coupled to a cathode of the light emitting diode.
18. The pixel circuit according to claim 17, further comprising:
A diode, a cathode of the diode receiving a reference signal, and an anode of the diode coupled to the second terminal of the second transistor.
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| Application Number | Priority Date | Filing Date | Title |
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| TW108110497A TWI695363B (en) | 2019-03-26 | 2019-03-26 | Pixel circuit |
| TW108110497 | 2019-03-26 |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI695363B (en) | 2020-06-01 |
| TW202036510A (en) | 2020-10-01 |
| CN110580878B (en) | 2021-09-03 |
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