CN203825988U - Pixel driving circuit, array substrate and display device - Google Patents
Pixel driving circuit, array substrate and display device Download PDFInfo
- Publication number
- CN203825988U CN203825988U CN201420248033.3U CN201420248033U CN203825988U CN 203825988 U CN203825988 U CN 203825988U CN 201420248033 U CN201420248033 U CN 201420248033U CN 203825988 U CN203825988 U CN 203825988U
- Authority
- CN
- China
- Prior art keywords
- transistor
- line
- storage capacitor
- signal
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The utility model relates to the display technology field and discloses a pixel driving circuit. The pixel driving circuit is characterized by comprising a data line, a first scanning line, a second scanning line, a power source line, a light emitting device, a display sub circuit and a light-sensitive sub circuit, wherein the display sub circuit is connected with the data line, the first scanning line, the second scanning line, the power source line and the light emitting device and is used for driving the light emitting device to realize light emitting and displaying under the control of the first scanning line, the second scanning line, the data line and the power source line, and the light-sensitive sub circuit is connected with the data line, the second scanning line and an enablement control line and is used for inducing touch motions under the control of the first scanning line, the second scanning line and the data line. The utility model further discloses a pixel driving method, an array substrate and a display device. The pixel driving circuit comprises the display sub circuit and the light-sensitive sub circuit, and the first scanning line and the second scanning line simultaneously realize displaying and touch induction.
Description
Technical Field
The utility model relates to a show technical field, in particular to pixel drive circuit, array substrate and display device.
Background
Organic Light Emitting Displays (AMOLEDs) are one of the hot spots in the research field of flat panel displays, and compared with liquid crystal displays, OLEDs have the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, fast response speed, and the like. The pixel driving circuit design is the core technical content of the AMOLED display and has important research significance.
At present, on an LCD display to which a part of light-sensing In cell touch technology has been successfully applied, mass production has been successfully performed by one-line manufacturers In the industry, and light-sensing touch has the same touch sensitivity and function as a capacitive touch, and another greatest advantage is that light-sensing touch is not limited by the size of a screen, and occupies a place In large-size touch. In addition, the touch control can be directly controlled by fingers, and meanwhile, a laser pen can be used for directly controlling the touch control in a long distance.
Therefore, if the light sensor in cell Touch technology and the AMOLED can be integrated, i.e. the Touch process and the amloded process are integrated together, the two processes represent the integration of the latest technical functions, and will be in an unfortunate position in the future display field. Therefore, a problem to be solved is urgently needed when the AMOLED display technology and the light sensing In cell touch are efficiently integrated.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The to-be-solved technical problem of the utility model is: how to efficiently integrate the AMOLED display technology and the light sensing In cell touch.
(II) technical scheme
In order to solve the above technical problem, the utility model provides a pixel driving circuit, include: the display device comprises a data line, a first scanning line, a second scanning line, a power line, a light-emitting device, a display sub-circuit and a light-sensitive sub-circuit;
the display sub-circuit is connected with the data line, the first scanning line, the second scanning line, the power line and the light-emitting device and is used for driving the light-emitting device to emit light to display under the control of the first scanning line, the second scanning line, the data line and the power line;
the light sensing sub-circuit is connected with the data line and the second scanning line and used for sensing touch action under the control of the second scanning line and the data line.
Wherein the light sensing sub-circuit comprises: the device comprises a reference signal line, a signal detection line, a first storage capacitor, a signal sensing unit and a signal reading and writing unit;
the signal reading and writing unit is connected with the first end of the first storage capacitor, the second scanning line and the signal detection line and is used for writing a signal of the signal detection line to the first end stored in the first storage capacitor under the control of the second scanning line or reading the signal stored in the first storage capacitor to the signal detection line;
the signal sensing unit is connected with the second scanning line, the reference signal line and the first storage capacitor and used for writing a signal of the reference signal line and a sensed light sensing signal into the first storage capacitor under the control of the second scanning line.
The signal reading and writing unit comprises a sixth transistor, a grid electrode of the sixth transistor is connected with the second scanning line, a source electrode of the sixth transistor is connected with the first end of the first storage capacitor, a drain electrode of the sixth transistor is connected with the signal detection line, and the sixth transistor is used for writing a signal of the signal detection line to the first end stored in the first storage capacitor or reading the signal stored in the first storage capacitor to the signal detection line.
Wherein, the signal induction unit includes: a seventh transistor and a light sensing transistor, wherein a gate of the seventh transistor is connected to the second scan line, a source of the seventh transistor is connected to the reference signal line, a drain of the seventh transistor is connected to a gate of the light sensing transistor and a second end of the first storage capacitor, and the seventh transistor is configured to write a reference signal line signal to the second end of the first storage capacitor; the grid electrode of the light sensing transistor is connected with the source electrode of the light sensing transistor, the drain electrode of the light sensing transistor is connected with the first end of the first storage capacitor, and the light sensing transistor is used for sensing a light sensing signal and writing the light sensing signal into the first end of the first storage capacitor.
Wherein the display sub-circuit comprises: the light-emitting device comprises a second storage capacitor, a driving transistor, a charging and discharging unit and a light-emitting control unit, wherein the source electrode of the driving transistor is connected with the first end of the second storage capacitor, and the drain electrode of the driving transistor is connected with the light-emitting device;
the charging and discharging unit is connected with the data line, the first scanning line, the second scanning line, the power line, the second storage capacitor and the driving transistor, and is used for charging two ends of the second storage capacitor and the grid electrode of the driving transistor under the control of the first scanning line and the second scanning line, so that the voltage at two ends of the second storage capacitor is the voltage of the power line, the grid electrode voltage of the driving transistor is the voltage of the data line, and the charging and discharging unit is also used for discharging the second storage capacitor under the control of the first scanning line and the second scanning line, so that the grid-source voltage difference of the driving transistor is the threshold voltage of the driving transistor;
the light-emitting control unit is connected with a first scanning line, a second end of a second storage capacitor and a driving transistor and is used for enabling the driving transistor to be connected with the power line under the control of the first scanning line so as to drive the light-emitting device to emit light.
Wherein the charge and discharge unit includes: a first transistor, a second transistor, a fourth transistor, and a fifth transistor; the grid electrode of the first transistor is connected with the second scanning line, the source electrode of the first transistor is connected with the power line, the drain electrode of the first transistor is connected with the first end of the second storage capacitor, the first transistor is used for writing the voltage of the power line into the first end of the second storage capacitor, and the first transistor is also used for disconnecting the first end of the second storage capacitor from the power line, so that the second storage capacitor is discharged until the grid-source voltage difference of the driving transistor is the threshold voltage of the driving transistor; the grid electrode of the second transistor is connected with a first scanning line, the source electrode of the second transistor is connected with the second end of the second storage capacitor, the drain electrode of the second transistor is grounded, and the second transistor is used for grounding the second end of the second storage capacitor; the grid electrode of the fourth transistor is connected with the first scanning line, the source electrode of the fourth transistor is connected with the data line, the drain electrode of the fourth transistor is connected with the grid electrode of the driving transistor, and the fourth transistor is used for setting the grid electrode voltage of the driving transistor to be the data line voltage; the gate of the fifth transistor is connected to the first scan line, the source is connected to the light emitting device, and the drain is grounded.
Wherein the light emission control unit includes: a third transistor and the first transistor; the third transistor is used for enabling a path to be formed between the second end of the second storage capacitor and the grid electrode of the driving transistor; the first transistor is used for connecting the source electrode of the driving transistor with the power line.
The light-emitting device is an organic light-emitting diode, the anode of the organic light-emitting diode is connected with the drain electrode of the driving transistor and the source electrode of the fifth transistor, and the cathode of the organic light-emitting diode is grounded.
The utility model also provides an array substrate, including above-mentioned arbitrary pixel drive circuit.
The utility model also provides a display device, including foretell array substrate.
(III) advantageous effects
The pixel driving circuit of the present invention includes a display sub-circuit and a light-sensing sub-circuit, and the common signal line (the first scanning line and the second scanning line) realizes display and touch sensing.
Drawings
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the pixel driving circuit of FIG. 1 during a reset phase;
FIG. 3 is a timing diagram of the pixel driving circuit of FIG. 1 during a reset phase, corresponding to timing phase 1;
FIG. 4 is a schematic diagram of the pixel driving circuit of FIG. 1 during a charging phase;
FIG. 5 is a timing diagram of the pixel driving circuit of FIG. 1 during a charging phase, corresponding to timing phase 2;
FIG. 6 is a schematic diagram of the pixel driving circuit of FIG. 1 during a compensation and light-emitting phase;
fig. 7 is a timing diagram of the pixel driving circuit in fig. 1 during the compensation and light-emitting phases, corresponding to timing phase 3.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
As shown in fig. 1, the pixel driving circuit of the present embodiment includes: a Data line Data, a first Scan line Scan [1], a second Scan line Scan [2], a power line S, a light emitting device D, a display sub-circuit 2 and a light sensing sub-circuit 1;
the display sub-circuit 2 is connected to the Data line Data, the first Scan line Scan [1], the second Scan line Scan [2], the power line S and the light emitting device D, and is used for driving the light emitting device D to emit light for display under the control of the first Scan line Scan [1], the second Scan line Scan [2], the Data line Data and the power line S.
The light sensing sub-circuit 1 is connected with the Data line Data and the second scanning line Scan [2] and is used for sensing touch action under the control of the second scanning line Scan [2] and the Data line Data.
In this embodiment, the photo sensor circuit 1 includes: the circuit comprises a reference signal Line R, a signal detection Line Y.Read Line, a first storage capacitor C1, a signal sensing unit and a signal reading and writing unit.
The signal read-write unit is connected to the first end of the first storage capacitor C1, the second Scan Line Scan [2] and the signal detection Line y.read Line, and is configured to write a signal of the signal detection Line y.read Line to the first end of the first storage capacitor C1 under the control of the second Scan Line Scan [2] (in an initialization phase, the first end of the first storage capacitor C1 is initialized with the signal of the y.read Line), or read a signal stored in the first storage capacitor C1 to the signal detection Line y.read Line (in a signal reading phase, the signal stored in the first storage capacitor C1 is read to the signal detection Line y.read Line).
The signal sensing unit is connected to the second Scan line Scan [2], the reference signal line R and the first storage capacitor C1, and is configured to write a signal of the reference signal line R and a sensed light sensing signal into the first storage capacitor C1 under the control of the second Scan line Scan [2 ].
The second Scan Line Scan [2] has a function of a horizontal detection Line, a data processing unit (the same as the principle of the prior art, and is not described herein) of the display device is connected with the y.read Line and the Scan [2] of each pixel unit, when the change of the signal output by the y.read Line is detected to exceed the threshold value, the touch action is determined, and at this time, the touched place is determined by the y.read Line of the pixel unit and the corresponding Scan [2 ].
In this embodiment, the signal reading/writing unit includes a sixth transistor M3, a gate of the sixth transistor M3 is connected to the second Scan Line Scan [2], a source of the sixth transistor M3 is connected to the first end of the first storage capacitor C1, and a drain of the sixth transistor M3 is connected to the signal detection Line y. The sixth transistor M3 is used to write the signal of the signal detection Line y.read Line to the first terminal of the first storage capacitor C1 for initial signal of the first terminal of the first storage capacitor C1 during the initialization phase. Or the sixth transistor M3 is configured to read the signal stored in the first storage capacitor to the signal detection Line y.read Line, and in the signal reading stage, read the signal stored in the first storage capacitor to the signal detection Line y.read Line, an amplifier may be usually disposed at the end of the signal detection Line, and the signal detection Line y.read Line may transmit the signal to the amplifier at the end, and perform data calculation and analysis on the signal amplified by the amplifier to a data processing unit in the display device, and compare the difference between the intensity changes of the photoelectric signals before and after touch with the threshold without touch, so as to determine whether there is a touch (how to determine specifically is similar to the prior art, and details are not repeated here).
The signal sensing unit includes: a seventh transistor M1 and a photo transistor M2. The gate of the seventh transistor M1 is connected to the second Scan line Scan [2], the source is connected to the reference signal line R, and the drain is connected to the gate of the photo transistor M2 and the second terminal of the first storage capacitor C1. The seventh transistor M1 is used to write a reference signal line signal to the second terminal of the first storage capacitor C1. The gate of the photo transistor M2 is connected to its source, the drain is connected to the first terminal of the first storage capacitor C1, and the photo transistor M2 is used for sensing a photo signal and writing the photo signal into the first terminal of the first storage capacitor C1.
The utility model discloses an including showing sub-circuit and light sense sub-circuit in the pixel drive circuit, and sharing signal line (first scanning line, second scanning line, data line and enable control line) has realized showing and touch-sensitive simultaneously (the utility model discloses the touch of mentioning includes with finger touch-control or laser touch-control).
In this embodiment, the display sub-circuit 2 includes: a second storage capacitor C2, a driving transistor DTFT, a charging/discharging unit, and a light emission control unit. The source of the driving transistor DTFT is connected to the first end (point a) of the second storage capacitor, and the drain is connected to the light emitting device D.
The charge and discharge unit is connected with the Data line Data and the first scanning line Scan [1]]A second Scan line Scan [2]]A power line S, a second storage capacitor C2 and a driving transistor DTFT for driving the first Scan line Scan [1]]And a second Scan line Scan [2]]The two ends of the second storage capacitor C2 and the gate of the driving transistor DTFT are charged under the control of the voltage regulator, so that the voltage at the two ends of the second storage capacitor C2 is the power line voltage, the gate voltage of the driving transistor DTFT is the data line voltage, and the voltage regulator is also used for the first Scan line Scan [1]]And a second Scan line Scan [2]]To discharge the second storage capacitor C2 so that the gate-source voltage difference of the driving transistor DTFT becomes the threshold voltage V of the driving transistor DTFTth。
The light emitting control unit is connected with a first Scan line Scan [1], a second end of the second storage capacitor C2 and a driving transistor DTFT, and is used for connecting the driving transistor DTFT with the power line S under the control of the first Scan line Scan [1] to drive the light emitting device D to emit light.
In this embodiment, the charge and discharge unit includes: a first transistor T1, a second transistor T2, a fourth transistor T4, and a fifth transistor T5. The gate of the first transistor T1 is connected to the second Scan line Scan [2]]A source connected to the power line S, a drain connected to a first terminal of the second storage capacitor C2, and a first transistor T1 for coupling a power line voltage (V)dd) The first end of the second storage capacitor C2 is written into, and the first end of the second storage capacitor C2 is disconnected from the power line S, so that the gate-source voltage difference of the driving transistor DTFT when the second storage capacitor C2 discharges to the driving transistor DTFT is the threshold voltage V of the driving transistor DTFTth. The above-mentionedThe gate of the second transistor T2 is connected to the first Scan line Scan [1]]A source connected to the second terminal (point b) of the second storage capacitor C2, a drain connected to ground, and the second transistor T2 for connecting the second terminal of the second storage capacitor C2 to ground (i.e. the voltage is 0, and the voltage across the second capacitor is V at this time)dd) (ii) a A gate of the fourth transistor T4 is connected to the first Scan line Scan [1]]A source connected to the Data line Data, a drain connected to the gate (point c) of the driving transistor DTFT, and the fourth transistor T4 for setting the gate voltage of the driving transistor DTFT to the Data line voltage (i.e. the gate voltage of the driving transistor DTFT is V)data) (ii) a A gate of the fifth transistor T5 is connected to the first Scan line Scan [1]]And a source connected to the light emitting device D and a drain connected to ground, and the fifth transistor T5 is used to short-circuit and ground the light emitting device D.
In this embodiment, the light emission control unit includes: a third transistor T3 and the first transistor T1 described above. The third transistor T3 has a gate connected to the first Scan line Scan [1], a source connected to the second terminal of the second storage capacitor C2, a drain connected to the gate of the driving transistor DTFT, and the third transistor T3 is configured to form a path between the second terminal of the second storage capacitor C2 and the gate of the driving transistor DTFT, that is, to connect the second terminal of the second storage capacitor C2 and the gate of the driving transistor DTFT. The first transistor T1 is used to connect the source of the driving transistor DTFT to the power line S.
In this embodiment, the light emitting device D is an Organic Light Emitting Diode (OLED), an anode of the OLED is connected to the drain of the driving transistor DTFT and the source of the fifth transistor T5, and a cathode of the OLED is grounded.
The pixel driving circuit of the embodiment adopts a compensation mode to solve the problem of the threshold voltage V of the driving transistorthThe effect of the change. Meanwhile, the design ensures that no current passes through the light emitting device (OLED) when the circuit is in a compensation stage and a buffering stage, and the service life of the OLED is indirectly prolonged.
The utility model discloses aim at how to integrate AMOLED display technology and light sense In cell touch high-efficiently, consequently, be not limited to the display sub-circuit In this embodiment to the display sub-circuit part, as long as need first scanning line, second scanning line, data line and the display sub-circuit (the number and the connected mode of TFT and electric capacity can be different) that enables the control line control can.
The present invention further provides a driving method of the pixel driving circuit, in which the display sub-circuit 2 drives the light emitting device D to emit light for display under the control of the first Scan line Scan [1], the second Scan line Scan [2], the Data line Data and the power line S; and the light sensing sub-circuit 1 senses the touch action under the control of the second scanning line Scan [2] and the Data line Data.
Specifically, the light sensing sub-circuit 1 includes: the steps of the light sensor sub-circuit 1 sensing the touch action under the control of the first Scan Line Scan [1], the second Scan Line Scan [2] and the Data Line Data specifically include:
applying a second Scan valid signal to a second Scan Line Scan [2] to cause the signal read/write unit to write a signal of the signal detection Line y.read Line to a first terminal stored in the first storage capacitor C1 to initialize the first terminal of the first storage capacitor C1;
applying a third scanning effective signal to the second scanning line Scan [2] to make the signal sensing unit write the signal of the reference signal line R and the sensed photo sensing signal into the first storage capacitor C1;
a second Scan valid signal is applied to the second Scan Line Scan [2] to cause the signal read/write unit to read out the signal stored in the first storage capacitor C1 to the signal detection Line y.
Specifically, the signal read-write unit includes a sixth transistor M3, a gate of the sixth transistor M3 is connected to the second Scan Line Scan [2], a source is connected to the first end of the first storage capacitor C1, and a drain is connected to the signal detection Line y.
The step of applying a second Scan valid signal to the second Scan Line Scan [2] to enable the signal read/write unit to write the signal of the signal detection Line y.read Line to the first end of the first storage capacitor C1 for initializing the first end of the first storage capacitor C1 specifically includes:
a second Scan valid signal is applied to the second Scan Line Scan [2], the sixth transistor M3 is turned on, and the signal of the signal detection Line y.read Line is written to the first terminal stored in the first storage capacitor C1 to initialize the first terminal of the first storage capacitor C1;
the step of applying a second Scan valid signal to the second Scan Line Scan [2] to make the signal read/write unit read the signal stored in the first storage capacitor C1 to the signal detection Line y.read Line specifically includes:
a second Scan valid signal is applied to the second Scan Line Scan [2], the sixth transistor M3 is turned on, and the signal stored in the first storage capacitor C1 is read out to the signal detection Line y.
Specifically, the signal sensing unit includes: a seventh transistor M1 and a photo transistor M2, wherein the gate of the seventh transistor M1 is connected to the second Scan line Scan [2], the source is connected to the reference signal line R, the drain is connected to the gate of the photo transistor M2 and the second end of the first storage capacitor C1, the gate of the photo transistor M2 is connected to the source thereof, and the drain is connected to the first end of the first storage capacitor C1;
the step of applying a third scanning effective signal to the second scanning line Scan [2] to enable the signal sensing unit to write the signal of the reference signal line R and the sensed photo sensing signal into the first storage capacitor C specifically includes:
the third Scan valid signal is applied to the second Scan line Scan [2], the seventh transistor M1 and the photo transistor M2 are turned on, the seventh transistor M1 writes the signal of the reference signal line R into the second end of the first storage capacitor C1, and the photo transistor M2 writes the sensed photo signal into the first end of the first storage capacitor C1.
Specifically, the display sub-circuit 2 includes: a second storage capacitor C2, a driving transistor DTFT, a charging/discharging unit, and a light emission control unit. The driving transistor DTFT has a source connected to the first end of the second storage capacitor C2, a drain connected to the light emitting device D, and the display sub-circuit 2 drives the light emitting device D to emit light under the control of the first Scan line Scan [1], the second Scan line Scan [2], the Data line Data, and the power line S, and specifically includes:
a first scanning effective signal is applied to the first scanning line Scan [1], a second scanning effective signal is applied to the second scanning line Scan [2] at the same time, the charging and discharging unit charges two ends of the second storage capacitor C2 and the grid electrode of the driving transistor DTFT, so that the voltage of two ends of the second storage capacitor C2 is power line voltage, and the grid electrode voltage of the driving transistor DTFT is data line voltage;
the charging and discharging unit discharges the second storage capacitor C2 by keeping the first Scan line Scan [1] as a first Scan effective signal and applying a third Scan effective signal to the second Scan line Scan [2], so that the gate-source voltage difference of the driving transistor DTFT is the threshold voltage of the driving transistor DTFT;
the light emission control unit forms a path between the second terminal of the second storage capacitor C2 and the gate of the driving transistor DTFT by applying an inactive signal to the first Scan line Scan [1] and simultaneously applying a second Scan active signal to the second Scan line Scan [2 ]; and the source of the driving transistor DTFT is connected to the power line S to drive the light emitting device D to emit light.
Specifically, the charge and discharge unit includes: a first transistor T1, a second transistor T2, a fourth transistor T4, and a fifth transistor T5; the gate of the first transistor T1 is connected to the second Scan line Scan [2], the source is connected to the power line S, and the drain is connected to the first end of the second storage capacitor C2; the gate of the second transistor T2 is connected to the first Scan line Scan [2], the source is connected to the second end of the second storage capacitor C2, and the drain is grounded; the gate of the fourth transistor T4 is connected to the first Scan line Scan [1], the source is connected to the Data line Data, and the drain is connected to the gate of the driving transistor DTFT; a gate electrode of the fifth transistor T5 is connected to the first Scan line Scan [1], a source electrode thereof is connected to the light emitting device D, and a drain electrode thereof is grounded;
the step of applying a first Scan effective signal to the first Scan line Scan [1] and applying a second Scan effective signal to the second Scan line Scan [2], where the charging and discharging unit charges the two ends of the second storage capacitor C2 and the gate of the driving transistor DTFT, so that the voltage at the two ends of the second storage capacitor C2 is a power line voltage, and the gate voltage of the driving transistor DTFT is a data line voltage specifically includes:
the first Scan effective signal is applied to the first Scan line Scan [1], and the second Scan effective signal is applied to the second Scan line Scan [2] at the same time, the first transistor T1, the second transistor T2, the fourth transistor T4 and the fifth transistor T5 are turned on, and the first transistor T1 writes the power line voltage into the first end of the second storage capacitor C2; the first transistor T1 connects the second terminal of the second storage capacitor C2 to ground; the fourth transistor T4 sets the gate voltage of the driving transistor DTFT to a data line voltage; the fifth transistor T5 short-circuits and grounds the light emitting device D;
the step of maintaining the first Scan line Scan [1] as a first Scan valid signal, applying a third Scan valid signal to the second Scan line Scan [2], discharging the second storage capacitor C2 by the charging and discharging unit, and making the gate-source voltage difference of the driving transistor DTFT be the threshold voltage of the driving transistor DTFT specifically includes:
when the first Scan line Scan [1] is maintained as the first Scan valid signal, and the third Scan valid signal is applied to the second Scan line Scan [2], the first transistor T1 is turned off, and the second storage capacitor C2 starts discharging, so that the gate-source voltage difference of the driving transistor DTFT is the threshold voltage of the driving transistor DTFT.
Specifically, the light emission control unit includes: a third transistor T3 and the first transistor T1; the gate of the third transistor T3 is connected to the first Scan line Scan [1], the source is connected to the second end of the second storage capacitor C2, and the drain is connected to the gate of the driving transistor DTFT;
the light emission control unit forms a path between the second terminal of the second storage capacitor C2 and the gate of the driving transistor DTFT by applying an inactive signal to the first Scan line Scan [1] and simultaneously applying a second Scan active signal to the second Scan line Scan [2 ]; the step of connecting the source of the driving transistor DTFT to the power line S to drive the light emitting device D to emit light specifically includes:
applying an inactive signal to the first Scan line Scan [1] and simultaneously applying a second Scan active signal to the second Scan line Scan [2], the first transistor T1 and the third transistor T3 being turned on, the third transistor T3 causing a path to be formed between the second terminal of the second storage capacitor C2 and the gate of the driving transistor DTFT; the first transistor T1 connects the source of the driving transistor DTFT to the power line S.
The following describes a driving process of the pixel driving circuit, that is, the driving circuit in fig. 1 (in which, except that the third transistor T3, the seventh transistor M1 and the photo transistor M2 are N-type transistors, the rest are P-type transistors, and the light emitting device is an OLED), specifically as shown in fig. 2 to 7, which includes three stages (for convenience of understanding, the working principles of the photo sub-circuit and the display sub-circuit are separately described, but the working process is performed simultaneously, in fig. 2, 4 and 6, the TFTs in the dashed line frame are turned on, and the dashed line arrows indicate the current flow direction of each stage).
In phase 1 of the timing diagram, as shown in fig. 2 and 3, the first Scan line Scan [1] and the second Scan line Scan [2] are at low level (i.e., the first Scan active signal and the second Scan active signal).
For the light sensing sub-circuit, in a signal initialization stage, Scan [2] is pulled low, M3 is conducted, the first storage capacitor C1 is connected into a signal detection Line Y.Read Line, initial signals are collected, and the first end of the first storage capacitor is initialized to prepare for the next stage of work.
For the display sub-circuit, for the signal reset phase, Scan [1]]、Scan[2]Pulling low, at which time T1, T2, T4 and T5 are turned on, T3 is turned off, and the first end a point of the second storage capacitor C2 is charged to VddThe second terminal b is grounded and has a voltage of 0, and the gate of DTFT, i.e., the voltage at point c is Vdata. The opening of T5 shorts the OLED to ground so that this process current does not pass through the OLED.
In phase 2 of the timing diagram, as shown in FIGS. 4 and 5, the first Scan line Scan [1] is at a low level and the second Scan line Scan [2] is at a high level (i.e., the third Scan active signal is active for the N-type transistor).
For the photo-sensing sub-circuit, for the signal collection phase, M2 is the photo TFT, M2 gate source connection, Scan [2]]Pulled high, M1 is conducted, and the reference voltage V is outputdWhen M2 is subjected to self-potential conversion, the potential difference stored in C1 is a fixed value, and when a touch (light touch or finger touch) is applied thereto, the illumination intensity received by M2 changes, and the charging current changes (if the light touch is light touch, such as irradiation of a laser pen, the illumination intensity increases, the charging current increases, and if the finger touch is light touch, the illumination intensity is reduced, and the charging current decreases). The pressure differential is stored in C1 in preparation for the signal read phase.
For the display sub-circuit, in the discharge phase, Scan [1]]Low, Scan [2]]Pulling high, wherein T2, T4 and T5 are conducted, T1 and T3 are disconnected, point a starts discharging until V is satisfieda－Vc＝VthUntil a point potential is VddBecomes Vdata+Vth. Likewise, this discharge process, due to the turn-off of T5, indirectly reduces OLED losses by not passing current through the OLED.
In phase 3 of the timing diagram, as shown in FIGS. 6 and 7, the first Scan line Scan [1] is at a high level, and the second Scan line Scan [2] is at a low level.
For the light sensing sub-circuit, in order to read the signal phase, Scan [2] is pulled down, M1 is closed at the moment, M3 is opened, the current stored at the upper end of C1 before is released, the signal is transmitted to the amplifier received at the tail end, and the amplified signal is sent to the data processing unit for data calculation and analysis; during the period, the touch action occurs, the difference value of the intensity change of the photoelectric signals before and after the touch is compared with the non-touch threshold value, so as to judge whether touch (light irradiation intensity change) exists, at this time, the X-direction coordinate is determined by the Scan [2] output point, and the Y-direction coordinate is determined by the read Line.
For the display sub-circuit, the OLED pixel is in the formal light-emitting stage, Scan [2]]Heightening, Scan [2]]Pulling low, at which time T1 and T3 are turned on, T2, T4 and T5 are turned off, and the voltage at point a reaches V againddB-end floating, VaAnd VbRealize the equal jump of voltage (keeping the original voltage difference V)data+Vth) Therefore V isb＝Vc＝Vdd－Vdata－VthAt this point, T5 is turned off, so that the OLED enters the light emitting phase directly.
From the driving transistor DTFT saturation current equation (where VGSGate-source voltage for DTFT):
IOLED＝K(VGS－Vth)2＝K[Vdd－(Vdd－Vdata－Vth)－Vth]2＝KVdata 2
wherein,μ is the carrier mobility, CoxW/L is the width-to-length ratio of the driving transistor.
The working current I at this time can be seen from the above formulaOLEDHas no influence on VthInfluence of (2) only with VdataIt is related. Thoroughly solves the problem of threshold voltage (V) of the driving TFT caused by the process and long-time operationth) Problem of drift, eliminating its pair IOLEDThe normal operation of the OLED is ensured.
The utility model also provides an array substrate, including foretell pixel drive circuit.
The utility model also provides a display device, including foretell array substrate. The display device may be: the display device comprises an AMOLED panel, a television, a digital photo frame, a mobile phone, a tablet personal computer and other products or components with any display function.
The above embodiments are only used for illustrating the present invention, and not for limiting the present invention, and those skilled in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention, so that all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.
Claims (10)
1. A pixel driving circuit, comprising: the display device comprises a data line, a first scanning line, a second scanning line, a power line, a light-emitting device, a display sub-circuit and a light-sensitive sub-circuit;
the display sub-circuit is connected with the data line, the first scanning line, the second scanning line, the power line and the light-emitting device and is used for driving the light-emitting device to emit light to display under the control of the first scanning line, the second scanning line, the data line and the power line;
the light sensing sub-circuit is connected with the data line and the second scanning line and used for sensing touch action under the control of the second scanning line and the data line.
2. The pixel driving circuit of claim 1, wherein the light sensing sub-circuit comprises: the device comprises a reference signal line, a signal detection line, a first storage capacitor, a signal sensing unit and a signal reading and writing unit;
the signal reading and writing unit is connected with the first end of the first storage capacitor, the second scanning line and the signal detection line and is used for writing a signal of the signal detection line to the first end stored in the first storage capacitor under the control of the second scanning line or reading the signal stored in the first storage capacitor to the signal detection line;
the signal sensing unit is connected with the second scanning line, the reference signal line and the first storage capacitor and used for writing a signal of the reference signal line and a sensed light sensing signal into the first storage capacitor under the control of the second scanning line.
3. The pixel driving circuit according to claim 2, wherein the signal reading and writing unit includes a sixth transistor, a gate of the sixth transistor is connected to the second scan line, a source is connected to the first terminal of the first storage capacitor, and a drain is connected to the signal detection line, the sixth transistor is configured to write a signal of the signal detection line to the first terminal of the first storage capacitor or read out a signal stored in the first storage capacitor to the signal detection line.
4. The pixel driving circuit according to claim 2, wherein the signal sensing unit comprises: a seventh transistor and a light sensing transistor, wherein a gate of the seventh transistor is connected to the second scan line, a source of the seventh transistor is connected to the reference signal line, a drain of the seventh transistor is connected to a gate of the light sensing transistor and a second end of the first storage capacitor, and the seventh transistor is configured to write a reference signal line signal to the second end of the first storage capacitor; the grid electrode of the light sensing transistor is connected with the source electrode of the light sensing transistor, the drain electrode of the light sensing transistor is connected with the first end of the first storage capacitor, and the light sensing transistor is used for sensing a light sensing signal and writing the light sensing signal into the first end of the first storage capacitor.
5. The pixel driving circuit according to any of claims 1 to 4, wherein the display sub-circuit comprises: the light-emitting device comprises a second storage capacitor, a driving transistor, a charging and discharging unit and a light-emitting control unit, wherein the source electrode of the driving transistor is connected with the first end of the second storage capacitor, and the drain electrode of the driving transistor is connected with the light-emitting device;
the charging and discharging unit is connected with the data line, the first scanning line, the second scanning line, the power line, the second storage capacitor and the driving transistor, and is used for charging two ends of the second storage capacitor and the grid electrode of the driving transistor under the control of the first scanning line and the second scanning line, so that the voltage at two ends of the second storage capacitor is the voltage of the power line, the grid electrode voltage of the driving transistor is the voltage of the data line, and the charging and discharging unit is also used for discharging the second storage capacitor under the control of the first scanning line and the second scanning line, so that the grid-source voltage difference of the driving transistor is the threshold voltage of the driving transistor;
the light-emitting control unit is connected with a first scanning line, a second end of a second storage capacitor and a driving transistor and is used for enabling the driving transistor to be connected with the power line under the control of the first scanning line so as to drive the light-emitting device to emit light.
6. The pixel driving circuit according to claim 5, wherein the charge and discharge unit comprises: a first transistor, a second transistor, a fourth transistor, and a fifth transistor; the grid electrode of the first transistor is connected with the second scanning line, the source electrode of the first transistor is connected with the power line, the drain electrode of the first transistor is connected with the first end of the second storage capacitor, the first transistor is used for writing the voltage of the power line into the first end of the second storage capacitor, and the first transistor is also used for disconnecting the first end of the second storage capacitor from the power line, so that the second storage capacitor is discharged until the grid-source voltage difference of the driving transistor is the threshold voltage of the driving transistor; the grid electrode of the second transistor is connected with a first scanning line, the source electrode of the second transistor is connected with the second end of the second storage capacitor, the drain electrode of the second transistor is grounded, and the second transistor is used for grounding the second end of the second storage capacitor; the grid electrode of the fourth transistor is connected with the first scanning line, the source electrode of the fourth transistor is connected with the data line, the drain electrode of the fourth transistor is connected with the grid electrode of the driving transistor, and the fourth transistor is used for setting the grid electrode voltage of the driving transistor to be the data line voltage; the gate of the fifth transistor is connected to the first scan line, the source is connected to the light emitting device, and the drain is grounded.
7. The pixel driving circuit according to claim 6, wherein the light emission control unit comprises: a third transistor and the first transistor; the third transistor is used for enabling a path to be formed between the second end of the second storage capacitor and the grid electrode of the driving transistor; the first transistor is used for connecting the source electrode of the driving transistor with the power line.
8. The pixel driving circuit according to claim 7, wherein the light emitting device is an organic light emitting diode, an anode of the organic light emitting diode is connected to the drain of the driving transistor and the source of the fifth transistor, and a cathode thereof is grounded.
9. An array substrate comprising the pixel driving circuit according to any one of claims 1 to 8.
10. A display device comprising the array substrate according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420248033.3U CN203825988U (en) | 2014-05-14 | 2014-05-14 | Pixel driving circuit, array substrate and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420248033.3U CN203825988U (en) | 2014-05-14 | 2014-05-14 | Pixel driving circuit, array substrate and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203825988U true CN203825988U (en) | 2014-09-10 |
Family
ID=51481462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420248033.3U Expired - Lifetime CN203825988U (en) | 2014-05-14 | 2014-05-14 | Pixel driving circuit, array substrate and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203825988U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103996376A (en) * | 2014-05-14 | 2014-08-20 | 京东方科技集团股份有限公司 | Pixel driving circuit and method, array substrate and display device |
| CN104680980A (en) * | 2015-03-25 | 2015-06-03 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof and display device |
| CN104700776A (en) * | 2015-03-25 | 2015-06-10 | 京东方科技集团股份有限公司 | Pixel circuit and driving method thereof, display device |
| WO2016177001A1 (en) * | 2015-05-04 | 2016-11-10 | 京东方科技集团股份有限公司 | Pixel circuit, driving method therefor, array substrate and display device thereof |
| JP2017120375A (en) * | 2015-12-25 | 2017-07-06 | Ｎｌｔテクノロジー株式会社 | Display device and manufacturing method of display device |
| CN107977109A (en) * | 2016-10-21 | 2018-05-01 | 三星显示有限公司 | Display device |
| CN111524483A (en) * | 2020-04-23 | 2020-08-11 | 福建华佳彩有限公司 | OLED external compensation circuit and OLED external compensation method |
| CN114639333A (en) * | 2022-03-22 | 2022-06-17 | 上海天马微电子有限公司 | Circuit structure and driving method, display device |
-
2014
- 2014-05-14 CN CN201420248033.3U patent/CN203825988U/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103996376A (en) * | 2014-05-14 | 2014-08-20 | 京东方科技集团股份有限公司 | Pixel driving circuit and method, array substrate and display device |
| WO2015172465A1 (en) * | 2014-05-14 | 2015-11-19 | 京东方科技集团股份有限公司 | Pixel drive circuit, drive method, array substrate and display device |
| CN103996376B (en) * | 2014-05-14 | 2016-03-16 | 京东方科技集团股份有限公司 | Pixel-driving circuit, driving method, array base palte and display device |
| US9760199B2 (en) | 2014-05-14 | 2017-09-12 | Boe Technology Group., Ltd. | Pixel driving circuit and driving method thereof, array substrate and display apparatus |
| CN104680980A (en) * | 2015-03-25 | 2015-06-03 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof and display device |
| CN104700776A (en) * | 2015-03-25 | 2015-06-10 | 京东方科技集团股份有限公司 | Pixel circuit and driving method thereof, display device |
| WO2016177001A1 (en) * | 2015-05-04 | 2016-11-10 | 京东方科技集团股份有限公司 | Pixel circuit, driving method therefor, array substrate and display device thereof |
| US10262597B2 (en) | 2015-05-04 | 2019-04-16 | Boe Technology Group Co., Ltd. | Pixel circuit and driving method thereof, array substrate and display apparatus |
| JP2017120375A (en) * | 2015-12-25 | 2017-07-06 | Ｎｌｔテクノロジー株式会社 | Display device and manufacturing method of display device |
| CN107977109A (en) * | 2016-10-21 | 2018-05-01 | 三星显示有限公司 | Display device |
| CN111524483A (en) * | 2020-04-23 | 2020-08-11 | 福建华佳彩有限公司 | OLED external compensation circuit and OLED external compensation method |
| CN114639333A (en) * | 2022-03-22 | 2022-06-17 | 上海天马微电子有限公司 | Circuit structure and driving method, display device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203825988U (en) | Pixel driving circuit, array substrate and display device | |
| CN103996376B (en) | Pixel-driving circuit, driving method, array base palte and display device | |
| CN103971639B (en) | Pixel-driving circuit and driving method, array base palte and display device | |
| US9720535B2 (en) | Pixel circuit and display apparatus | |
| CN104091563B (en) | Image element circuit and driving method, organic electroluminescence display panel and display device | |
| US10262597B2 (en) | Pixel circuit and driving method thereof, array substrate and display apparatus | |
| CN104021756B (en) | Pixel circuit and driving method thereof, organic light-emitting display panel and display apparatus | |
| US10068950B2 (en) | Pixel circuit, driving method thereof, and display apparatus | |
| US9984272B2 (en) | Pixel circuit, its driving method, light-emitting diode display panel, and display device | |
| EP3163559B1 (en) | Pixel circuit, display panel and display device | |
| CN103680385B (en) | Touch control circuit and drive method thereof, array substrate and touch control display device | |
| EP2985679B1 (en) | Touch control display drive circuit and touch control display apparatus comprising the touch control display drive circuit | |
| CN103413521B (en) | Organic light-emitting diode pixel circuit, method for driving same and display device | |
| WO2016045301A1 (en) | Pixel circuit, driving method therefor, organic light-emitting display panel, and display device | |
| JP2016531322A (en) | Touch display driving circuit, driving method thereof, and display device | |
| CN104064140A (en) | Pixel circuit, drive method of pixel circuit, organic light-emitting display panel and display device | |
| CN203366702U (en) | Touch display driving circuit and display device | |
| US9778800B2 (en) | Pixel circuit, display panel and display apparatus | |
| CN108874195A (en) | Touch pixel-driving circuit and driving method, touch control display apparatus | |
| CN203812536U (en) | Pixel drive circuit, array substrate and display apparatus | |
| CN203870951U (en) | Pixel circuit, organic light-emitting display panel, and display device | |
| CN203520345U (en) | Organic light emitting diode pixel circuit and display device | |
| CN203858846U (en) | Pixel circuit, organic light-emitting display panel and display device | |
| CN203941677U (en) | Image element circuit, display panel and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140910 Effective date of abandoning: 20160316 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |