CN109671397A - Glow current control circuit, pixel circuit, display device and display driving method - Google Patents
Glow current control circuit, pixel circuit, display device and display driving method Download PDFInfo
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- CN109671397A CN109671397A CN201910118129.5A CN201910118129A CN109671397A CN 109671397 A CN109671397 A CN 109671397A CN 201910118129 A CN201910118129 A CN 201910118129A CN 109671397 A CN109671397 A CN 109671397A
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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]
- G09G3/3225—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] using an active matrix
- G09G3/3233—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] using an active matrix with pixel circuitry controlling the current through the light-emitting element
Abstract
The present invention provides a kind of glow current control circuit, pixel circuit, display device and display driving method.Glow current control circuit includes ratio control circuit and conversion circuit, wherein the ratio control circuit includes the first branch and second branch, and the first branch is connect with the conversion circuit, and the second branch is connected to the light emitting element；The ratio control circuit is used to control the current value for the first electric current for flowing through the first branch and flows through between the current value of the second electric current of the second branch in proportionate relationship；The conversion circuit is also connect with data line, for the data voltage on the data line to be converted to first electric current.The present invention is adjusted while simplifying mask design by data voltage, the current value of the second luminous electric current of accurate control driving light-emitting component, and regulative mode is simple.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of glow current control circuits, pixel circuit, display device
And display driving method.
Background technique
With the development of display industry, due to OLED (Organic Light-Emitting Diode, organic light-emitting diodes
Pipe) display technology have many advantages, such as self-luminous, wide viewing angle, almost infinite high contrast, compared with low power consumption, high reaction speed,
And the display technology that can highly carry, fold is made to become possible, gradually by public favor and concern.
Existing AMOLED display module can not be adjusted, Ji Kejing while simplifying mask design by data voltage
The really current value of the luminous electric current of control driving light-emitting component can not realize current constant control, make under the premise of simplifying structure
The electric current that light-emitting component must be flowed through is not influenced by display panel line impedance.
Summary of the invention
The main purpose of the present invention is to provide a kind of glow current control circuit, pixel circuit, display device and displays
Driving method solves to adjust while simplifying mask design by data voltage in the prior art, accurate control driving
The current value of the second luminous electric current of light-emitting component can not realize current constant control, so that flowing through under the premise of simplifying structure
The problem of electric current of light-emitting component is not influenced by display panel line impedance.
In order to achieve the above object, the present invention provides a kind of glow current control circuit, the glow current control electricity
Road includes ratio control circuit and conversion circuit, wherein
The ratio control circuit includes the first branch and second branch, and the first branch and the conversion circuit connect
It connects, the second branch is connected to the light emitting element；
The ratio control circuit is used to control the current value for the first electric current for flowing through the first branch and flows through described
It is in proportionate relationship between the current value of second electric current of second branch；
The conversion circuit is also connect with data line, for the data voltage on the data line to be converted to described first
Electric current.
When implementation, the first branch includes first resistor and the first transistor, and the second branch includes second resistance
And second transistor；
The first end of the first end of the first resistor and the second resistance is all connect with power voltage terminal；
The control electrode of the first transistor is connected with the control electrode of the second transistor；
First pole of the first transistor is connect with the second end of the first resistor, and the first of the second transistor
Pole is connect with the second end of the second resistance；
Second pole of the first transistor is connect with the conversion circuit, the second pole of the second transistor with it is described
Light-emitting component connection.
When implementation, the resistance value of the first resistor is equal with the resistance value of the second resistance, the first transistor
Type it is identical as the type of the second transistor, the electricity of the electric parameter of the first transistor and the second transistor
Gas parameter is identical.
When implementation, the conversion circuit includes operational amplifier, the first transfer resistance, the second transfer resistance and third conversion
Resistance；
The first input end of the operational amplifier is connect with the data line；
Second input terminal of the operational amplifier is connect by first transfer resistance with first voltage end, the fortune
The second input terminal for calculating amplifier also passes through second transfer resistance and connect with the output end of the operational amplifier；The fortune
The output end for calculating amplifier is also connect by the third transfer resistance with second voltage end.
The present invention also provides a kind of pixel circuits, including light-emitting component, turn-on control circuit and above-mentioned glow current
Control circuit；
The of the glow current control circuit includes in ratio control circuit second branch and the light-emitting component
The connection of one pole；
Second pole of the light-emitting component is connect with the first end of the turn-on control circuit, the turn-on control circuit
Second end is connect with tertiary voltage end；
The control terminal of the turn-on control circuit is connect with grid line, and the turn-on control circuit is used on the grid line
Under the control of gate drive signal, controls and be connected between the second pole of the light-emitting component and the tertiary voltage end.
The present invention also provides a kind of display devices, including N number of above-mentioned glow current control circuit, display base plate, M row
N column pixel unit, M row grid line and N column data line；The M row N column pixel unit, the M row grid line and the N column data line
It is placed on the display base plate；
Positioned at the n-th column the pixel unit light-emitting component that includes the first pole all with n-th of glow current control circuit packet
Second branch connection in the ratio control circuit included；
Pixel unit positioned at m row is all connect with m row grid line；
Conversion circuit in n-th of glow current control circuit is connect with the n-th column data line；
M and N is positive integer, and m is the positive integer less than or equal to M, and n is the positive integer less than or equal to N.
When implementation, m row the n-th column pixel unit includes m row the n-th column light-emitting component and the column conducting control electricity of m row n-th
Road；
The second branch and the m row n-th that n-th of glow current control circuit includes in ratio control circuit
First pole of column light-emitting component connects；
Second pole of the m row the n-th column light-emitting component and the first end of the m row the n-th column turn-on control circuit connect
It connects, the second end of the m row the n-th column turn-on control circuit is connect with tertiary voltage end；
The control terminal of the m row the n-th column turn-on control circuit is connect with m row grid line, the column of m row n-th conducting
Control circuit is used under the control of the gate drive signal on the m row grid line, controls the luminous member of the column of m row n-th
It is connected between second pole of part and the tertiary voltage end.
When implementation, the glow current control circuit is set to the neighboring area of the display base plate.
When implementation, display device of the present invention further includes drive integrated circult；The glow current control circuit collection
In drive integrated circult described in Cheng Yu.
The present invention also provides a kind of display driving methods, applied to above-mentioned display device, the display driving method
Include: in the display cycle,
Conversion circuit in n-th of glow current control circuit is converted to the data voltage on the n-th column data line accordingly
The first electric current, the ratio control circuit in n-th of glow current control circuit controls the current value and stream of the first electric current
It crosses in proportionate relationship between the current value of the second electric current of the second branch in the ratio control circuit, and second electric current is mentioned
It is supplied to the n-th column pixel unit；
N is the positive integer less than or equal to N, and N is positive integer.
When implementation, m row the n-th column pixel unit includes m row the n-th column light-emitting component and the column conducting control electricity of m row n-th
Road；In the m scan period that the display cycle includes,
M row grid line open, m row the n-th column turn-on control circuit control the n-th column of m row light-emitting component the second pole with
Tertiary voltage is connected between end, which is provided to the luminous member of the column of m row n-th by the n-th glow current control circuit
Part；
M is the positive integer less than or equal to M, and M is positive integer.
Compared with prior art, glow current control circuit of the present invention, pixel circuit, display device and display are driven
Dynamic method can be adjusted while simplifying mask design by data voltage, can accurately be controlled driving light-emitting component and be shone
The second electric current current value, shown to adjust grayscale, regulative mode is simple, and can simplify structure under the premise of,
Current constant control is realized, so that flow through the electric current of light-emitting component is not influenced by display panel line impedance.
Detailed description of the invention
Fig. 1 is the structure chart of glow current control circuit described in the embodiment of the present invention；
Fig. 2 is the structure chart of glow current control circuit described in another embodiment of the present invention；
Fig. 3 is the circuit diagram of glow current control circuit described in further embodiment of this invention；
Fig. 4 is the circuit diagram of pixel circuit described in the embodiment of the present invention；
Fig. 5 is the structure chart of a specific embodiment of display device of the present invention；
Fig. 6 is the working timing figure of the specific embodiment of present invention display device as shown in Figure 5.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The transistor used in all embodiments of the invention all can be triode, thin film transistor (TFT) or field-effect tube or its
The identical device of his characteristic.In embodiments of the present invention, to distinguish the two poles of the earth of transistor in addition to control electrode, will wherein claim a pole
For the first pole, another pole is known as the second pole.
In practical operation, when the transistor is triode, the control electrode can be base stage, and first pole can
Think collector, second pole can be with emitter；Alternatively, the control electrode can be base stage, described first can be extremely hair
Emitter-base bandgap grading, second pole can be with collector.
In practical operation, when the transistor is thin film transistor (TFT) or field-effect tube, the control electrode can be grid
Pole, described first can be extremely drain electrode, and described second extremely can be source electrode；Alternatively, the control electrode can be grid, described the
One extremely can be source electrode, and described second can be extremely drain electrode.
As shown in Figure 1, glow current control circuit described in the embodiment of the present invention includes ratio control circuit 11 and conversion
Circuit 12, wherein
The ratio control circuit 11 includes first branch L1 and second branch L2, the first branch L1 and the conversion
Circuit 12 connects, and the second branch L2 is connect with light-emitting element E L；
The ratio control circuit 11 is used to control the current value and stream for the first electric current I1 for flowing through the first branch L1
It crosses between the current value of the second electric current I2 of the second branch L2 in proportionate relationship；
The conversion circuit 12 is also connect with data line Data, for converting the data voltage on the data line Data
For the first electric current I1.
Glow current control circuit described in the embodiment of the present invention passes through conversion circuit 12 for the data on data line Data
Voltage is converted to the first electric current I1, and ratio control circuit 11 can control the electric current for flowing through the first electric current I1 of first branch L1
Be worth and flow through the second branch L2 the second electric current I2 current value between in proportionate relationship, and the second electric current I2 is sent to
Light-emitting element E L, is adjusted by data voltage, can accurately control the current value of the second luminous electric current of driving light-emitting element E L,
It is shown to adjust grayscale, regulative mode is simple, and can realize current constant control under the premise of simplifying structure, so that stream
The electric current for crossing light-emitting component is not influenced by panel (display panel) line impedance.
Specifically, the light-emitting element E L can be Organic Light Emitting Diode, but not limited to this.
In the specific implementation, the first branch may include first resistor and the first transistor, and the second branch can
To include second resistance and second transistor；
The first end of the first end of the first resistor and the second resistance is all connect with power voltage terminal；
The control electrode of the first transistor is connected with the control electrode of the second transistor；
First pole of the first transistor is connect with the second end of the first resistor, and the first of the second transistor
Pole is connect with the second end of the second resistance；
Second pole of the first transistor is connect with the conversion circuit, the second pole of the second transistor with it is described
Light-emitting component connection.
Specifically, the resistance value of the first resistor is equal with the resistance value of the second resistance, the first transistor
Type it is identical as the type of the second transistor, the electricity of the electric parameter of the first transistor and the second transistor
Gas parameter is identical, so that the ratio control circuit is current-mirror structure.
In the specific implementation, the type of the first transistor is identical as the type of the second transistor, for example, described
The first transistor and the second transistor can be PNP type triode simultaneously, alternatively, the first transistor and described second
Transistor can be NPN type triode simultaneously, alternatively, the first transistor and the second transistor can be NMOS simultaneously
(N-Metal-Oxide-Semiconductor, N-type Metal-oxide-semicondutor) transistor, alternatively, the first transistor
It can simultaneously be PMOSMOS (P-Metal-Oxide-Semiconductor, p-type metal-oxide-with the second transistor
Semiconductor) transistor, alternatively, the first transistor and the second transistor can be N-type TFT (Thin Film simultaneously
Transistor, thin film transistor (TFT)), alternatively, the first transistor and the second transistor can be p-type TFT simultaneously, but
It is not limited.
In the specific implementation, the electric parameter of the first transistor is identical as the electric parameter of the second transistor.
For example, the electric parameter may include the parameters such as breadth length ratio, power consumption, volt-ampere parameter, the type of the electric parameter is ability
Well known to field technique personnel, details are not described herein.
As shown in Fig. 2, on the basis of the embodiment of glow current control circuit shown in Fig. 1, the first branch L1
It include the second triode VT2 and second resistance R2 including the first triode VT1 and first resistor R1, the second branch L2,
In,
The base stage of VT1 and the base stage of VT2 connect；
The first end of R1 and the first end of R2 are all connect with power voltage terminal, and the power voltage terminal is for providing power supply electricity
Press VCC；
The emitter of VT1 and the second end of R1 connect, and the emitter of VT2 and the second end of R2 connect；
The collector of VT1 is connect with the conversion circuit 12, and the collector of VT2 is connect with the light-emitting element E L.
In the embodiment shown in Figure 2, the resistance value of R1 is equal to the resistance value of R2, and the electric parameter of VT1 and VT2's is electrical
Parameter is identical, and but not limited to this.
In the specific implementation, the ratio control circuit 11 may include first branch L1 and second branch L2, and first
Road L1 includes first resistor R1 and the first triode VT1, and second branch L2 includes second resistance R2 and the second triode VT2,
The i.e. described ratio control circuit 11 is current-mirror structure, so that flowing through the current value of the first electric current of first branch L1 and flowing through
The current value of second branch L2 is equal, and the current direction of the current direction of the first electric current and the second electric current is identical.
In the specific implementation, the conversion circuit may include operational amplifier, the first transfer resistance, the second transfer resistance
With third transfer resistance；
The first input end of the operational amplifier is connect with the data line；
Second input terminal of the operational amplifier is connect by first transfer resistance with first voltage end, the fortune
The second input terminal for calculating amplifier also passes through second transfer resistance and connect with the output end of the operational amplifier；The fortune
The output end for calculating amplifier is also connect by the third transfer resistance with second voltage end.
Specifically, the first voltage end can be ground terminal, or low-voltage end, the first voltage end can be
Ground terminal, or low-voltage end, but not limited to this.
Specifically, on the basis of the embodiment of glow current control circuit shown in Fig. 2, as shown in figure 3, the conversion
Circuit 12 includes operational amplifier Cmp, the first transfer resistance R3, the second transfer resistance R4 and third transfer resistance R5；
The normal phase input end of the operational amplifier Cmp is connect with the data line Data；
The negative-phase input of the operational amplifier Cmp is connect by the first transfer resistance R3 with ground terminal GND, described
The negative-phase input of operational amplifier Cmp also passes through the output end of the second transfer resistance R4 Yu the operational amplifier Cmp
Connection；The output end of the operational amplifier Cmp is also connect by the third transfer resistance R5 with ground terminal GND.
In the embodiment shown in fig. 3, VT1 and VT2 is PNP type triode, and but not limited to this.
In the embodiment shown in fig. 3, first voltage end and second voltage end are all ground terminal, and but not limited to this.
In the embodiment shown in fig. 3, the resistance value of R3 and the resistance value of R4 are equal, and but not limited to this, in practical behaviour
When making, the resistance value of R3 and the resistance value of R4 can also be unequal.
In the embodiment shown in fig. 3, the first input end of operational amplifier Cmp is its normal phase input end, operation amplifier
The second input terminal of device Cmp is its negative-phase input, and but not limited to this.
At work, Data output data voltage Vdata, Vdata are positive value, I1 to present invention embodiment as shown in Figure 3
=I2, and the current direction of the current direction of I1 and I2 are all from top to bottom；
I1=IR5+IR4；
The voltage of negative-phase input of the voltage Vdata of the normal phase input end of Cmp equal to Cmp, therefore flow through the electric current of R3
The current value of IR3 is equal to Vdata/Rz3, and the direction of IR3 is the left end that R3 is flowed to by the right end of R3, then the electricity of the output end of Cmp
Pressure is equal to 2Vdata；Wherein, Rz3 is the resistance value of R3；
The current value for flowing through the electric current IR5 of R5 is equal to 2Vdata/Rz5, and the current direction of IR5 is from top to bottom；Wherein,
Rz5 is the resistance value of R5；
The current value for flowing through the electric current IR4 of R4 is equal to Vdata/Rz4, and the direction of IR4 is the left side that R4 is flowed to by the right end of R4
End；Wherein, Rz4 is the resistance value of R4；
Then I1 is equal to Vdata/Rz4+2Vdata/Rz5, and since I1 is equal to I2, then I2 is equal to Vdata/Rz4+2Vdata/
Rz5；
Second branch L2 provides I2 to light-emitting element E L.
Pixel circuit described in the embodiment of the present invention includes light-emitting component, turn-on control circuit and above-mentioned glow current control
Circuit processed；
The of the glow current control circuit includes in ratio control circuit second branch and the light-emitting component
The connection of one pole；
Second pole of the light-emitting component is connect with the first end of the turn-on control circuit, the turn-on control circuit
Second end is connect with tertiary voltage end；
The control terminal of the turn-on control circuit is connect with grid line, and the turn-on control circuit is used on the grid line
Under the control of gate drive signal, controls and be connected between the second pole of the light-emitting component and the tertiary voltage end.
In the specific implementation, the tertiary voltage end can be ground terminal, or low-voltage end, but not limited to this.
At work, when the grid line is opened, turn-on control circuit is in institute for pixel circuit described in the embodiment of the present invention
It under the control for stating grid line, controls and is connected between the second pole of light-emitting component and tertiary voltage end, second branch provides second at this time
Current value light-emitting component, so that light-emitting component shines.
In the specific implementation, the light-emitting component can be Organic Light Emitting Diode, and the first of the light-emitting component is extremely
The anode of the Organic Light Emitting Diode, the cathode of the extremely described Organic Light Emitting Diode of the second of the light-emitting component.
Specifically, the turn-on control circuit may include control transistor；
The control electrode of the control transistor is connect with the grid line, and the first pole of the control transistor shines with described
Second pole of element connects, and the second pole of the control transistor is connect with the tertiary voltage end.
As shown in figure 4, pixel circuit described in the embodiment of the present invention includes glow current control circuit as shown in Figure 3
Embodiment, pixel circuit described in the embodiment of the present invention further include light-emitting component and control transistor VT3；
The light-emitting component is Organic Light Emitting Diode OLED；
The collector of VT2 and the anode of OLED connect；
The grid of VT3 is connect with grid line Gate, and the drain electrode of VT3 is connect with the cathode of OLED, the source electrode and ground terminal GND of VT3
Connection.
In the embodiment shown in fig. 4, tertiary voltage end is ground terminal, and VT3 is n type field effect transistor, and light-emitting component is
Organic Light Emitting Diode, but not limited to this.
At work, when scanning grid line Gate, Gate output is high for the embodiment of present invention pixel circuit as shown in Figure 4
Level, VT3 are opened, and electric current reaches OLED by R2 and VT2 from power voltage terminal, are formed into a loop by VT3, because then flowing through
The electric current IOLED=IR5+IR4 of OLED；IR5 is the electric current for flowing through R5, and IR4 is the electric current for flowing through R4；It can be according to required grayscale
Or brightness, by adjusting the data voltage size of Data output, to adjust the electric current for flowing through OLED；
At this point, the data voltage of Data output is positive voltage, then the sense of current for flowing through OLED is from top to bottom.
At work, when not scanning grid line Gate, Gate is exported the embodiment of present invention pixel circuit as shown in Figure 4
Low level, VT3 shutdown, OLED do not shine.
Display device described in the embodiment of the present invention includes N number of above-mentioned glow current control circuit, display base plate, M row N
Column pixel unit, M row grid line and N column data line；The M row N column pixel unit, the M row grid line and the N column data line can
To be set on the display base plate；
Positioned at the n-th column the pixel unit light-emitting component that includes the first pole all with n-th of glow current control circuit packet
Second branch connection in the ratio control circuit included；
Pixel unit positioned at m row is all connect with m row grid line；
Conversion circuit in n-th of glow current control circuit is connect with the n-th column data line；
M and N is positive integer, and m is the positive integer less than or equal to M, and n is the positive integer less than or equal to N.
In practical operation, M row N column pixel unit, M row grid line and N columns can be set on the display base plate
According to line, and display device described in the embodiment of the present invention may include N number of glow current control circuit, and one described luminous
Current control circuit is corresponding with a column pixel unit, conversion circuit and the n-th column pixel in n-th of glow current control circuit
Unit connection, positioned at the n-th column the pixel unit light-emitting component that includes the first pole all with n-th of glow current control circuit packet
Second branch connection in the ratio control circuit included, the pixel unit positioned at m row are all connect with m row grid line.
The structure of display device described in the embodiment of the present invention is simple, can simplify mask (exposure mask) design while,
The driving current of accurate control light-emitting component, realizes that grayscale is accurately adjusted, it is easier to realize high brightness and high-resolution, and make
Flow through the electric current of light-emitting component under same gray level and do not influenced by display panel line impedance.
Display device provided by the embodiment of the present invention can be mobile phone, tablet computer, television set, display, notebook
Any products or components having a display function such as computer, Digital Frame, navigator.
Display device described in the embodiment of the present invention at work, in the display cycle,
Conversion circuit in n-th of glow current control circuit is converted to the data voltage on the n-th column data line accordingly
The first electric current, the ratio control circuit in n-th of glow current control circuit controls the current value and stream of the first electric current
It crosses in proportionate relationship between the current value of the second electric current of the second branch in the ratio control circuit, and second electric current is mentioned
It is supplied to the n-th column pixel unit；
N is the positive integer less than or equal to N, and N is positive integer.
Specifically, the light-emitting component can be Organic Light Emitting Diode, the extremely organic hair of the first of the light-emitting component
The anode of optical diode, but not limited to this.
In the specific implementation, the n-th column of m row pixel unit may include that m row the n-th column light-emitting component and m row n-th arrange
Turn-on control circuit；
The second branch and the m row n-th that n-th of glow current control circuit includes in ratio control circuit
First pole of column light-emitting component connects；
Second pole of the m row the n-th column light-emitting component and the first end of the m row the n-th column turn-on control circuit connect
It connects, the second end of the m row the n-th column turn-on control circuit is connect with tertiary voltage end；
The control terminal of the m row the n-th column turn-on control circuit is connect with m row grid line, the column of m row n-th conducting
Control circuit is used under the control of the gate drive signal on the m row grid line, controls the luminous member of the column of m row n-th
It is connected between second pole of part and the tertiary voltage end.
Specifically, the n-th column of m row light-emitting component can be the n-th column of m row Organic Light Emitting Diode, the m row
The anode of the extremely m row the n-th column Organic Light Emitting Diode of the first of n-th column light-emitting component, the column of m row n-th shine
The cathode of the extremely m row the n-th column Organic Light Emitting Diode of the second of element；
The m row the n-th column turn-on control circuit may include the column of the m row n-th control transistor；The m row
The control electrode of n-th column control transistor connect with m row grid line, the m row n-th arrange control the first pole of transistor with it is described
The cathode of m row the n-th column Organic Light Emitting Diode connects, the second pole of the column of the m row n-th control transistor and tertiary voltage
End connection.
In the specific implementation, the tertiary voltage end can be low-voltage end, or ground terminal, but not limited to this.
According to a kind of specific embodiment, the glow current control circuit can be drawn by mask (exposure mask) and is set to
The neighboring area of the display base plate.
According to another specific embodiment, display device described in the embodiment of the present invention can also include the integrated electricity of driving
Road；The glow current control circuit is integrated in the drive integrated circult.
Illustrate display device of the present invention below by a specific embodiment.
As shown in figure 5, a specific embodiment of display device of the present invention includes N number of glow current shown in Fig. 3
Embodiment, display base plate (being not shown in Fig. 5), M row N column pixel unit, M row grid line and the N column data line of control circuit；
The M row N column pixel unit is set to the area AA (effective display area) of the display base plate (being not shown in Fig. 5)；
N number of glow current control circuit is drawn outside the area AA by mask (exposure mask) namely N number of glow current
Control circuit is set to the neighboring area of the display base plate (being not shown in Fig. 5)；
N-th glow current control circuit includes n-th of first triode VT1n, n-th of first resistor R1n, n-th the
Two triode VT2n, n-th of second resistance R2n, n-th of operational amplifier Cmpn, n-th of first transfer resistance R3n, n-th
Second transfer resistance R4n and n-th of third transfer resistance R5n；The normal phase input end of Cmpn is connect with the n-th column data line Datan；
M row the n-th column pixel unit includes m row the n-th column Organic Light Emitting Diode OLEDmn and the column control of m row n-th
The anode of transistor VT3mn, OLEDmn and the collector of VT2n connect；
The grid of VT3mn is connect with m row grid line Gatem, and the drain electrode of VT3mn is connect with the cathode of OLEDmn, VT3mn's
Source electrode is connect with ground terminal GND；
M and N is positive integer, and m is the positive integer less than or equal to M, and n is the positive integer less than or equal to N；
The first row first row pixel unit, m row first row pixel unit, m+1 row first row are delineated in Fig. 5
Pixel unit, first glow current control circuit, M row first row pixel unit, the first row the n-th column pixel unit, m row
N-th column pixel unit, the n-th column of m+1 row pixel unit, M row the n-th column pixel unit, n-th of glow current control circuit,
The first row Nth column pixel unit, m row Nth column pixel unit, m+1 row Nth column pixel unit, M row Nth column pixel list
Member and n-th glow current control circuit, wherein
OLED11 is the first row first row pixel unit, and VT311 is that the first row first row controls transistor；
OLEDm1 is m row first row pixel unit, and VT3m1 is that m row first row controls transistor；
OLEDm+11 is m+1 row first row pixel unit, and VT3m+11 is that m+1 row first row controls transistor；
OLEDM1 is M row first row pixel unit, and VT3M1 is that M row first row controls transistor；
OLED1n is the n-th column of the first row pixel unit, and VT31n is the column control transistor of the first row n-th；
OLEDmn is the n-th column of m row pixel unit, and VT3mn is the column control transistor of m row n-th；
OLEDm+1n is the n-th column of m+1 row pixel unit, and VT3m+1n is the column control transistor of m+1 row n-th；
OLEDMn is the n-th column of M row pixel unit, and VT3Mn is the column control transistor of M row n-th；
OLED1N is the first row Nth column pixel unit, and VT31N is that the first row Nth column controls transistor；
OLEDmN is m row Nth column pixel unit, and VT3mN is that m row Nth column controls transistor；
OLEDm+1N is m+1 row Nth column pixel unit, and VT3m+1N is that m+1 row Nth column controls transistor；
OLEDMN is M row Nth column pixel unit, and VT3MN is that M row Nth column controls transistor；
As shown in figure 5, first glow current control circuit includes first the first triode VT11, first the first electricity
Hinder R11, first the second triode VT21, first second resistance R21, first operational amplifier Cmp1, first first
Transfer resistance R31, first the second transfer resistance R41 and first third transfer resistance R51；The normal phase input end of Cmpn and
One column data voltage Data1 connection；
N-th glow current control circuit includes the first triode of n-th VT1N, n-th first resistor R1N, n-th
Two triode VT2N, n-th second resistance R2N, n-th operational amplifier CmpN, the first transfer resistance of n-th R3N, n-th
Second transfer resistance R4N and n-th third transfer resistance R5N；The normal phase input end and Nth column data voltage DataN of CmpN connects
It connects.
In specific embodiment shown in Fig. 5, Data1 is the first column data line, and Datan is the n-th column data line, DataN
For Nth column data line, Gate1 is the first row grid line, and Gatem is m row grid line, and Gatem+1 is m+1 row grid line, and GateM is
M row grid line.
It is supply voltage marked as VCC in Fig. 5, VCC is provided by power voltage terminal.
In specific embodiment shown in Fig. 5, each transistor that controls all is n type field effect transistor, and each triode is all
PNP type triode, but not limited to this.
As shown in fig. 6, the specific embodiment of present invention display device as shown in Figure 5 is at work,
When scanning m row grid line Gatem, Gatem exports high level, other grid lines export low level, Datan output the
The n-th column data voltage of m row, VT3mn is opened, so that the cathode of OLEDmn is connect with ground terminal GND, electric current is passed through from power voltage terminal
R2mn and the VT2mn of opening flow to OLEDmn, to drive OLEDmn to shine, then flow through the electric current IOLED (m, n) of OLEDmn with
The n-th column data voltage of m row of Datan output is related；
When scanning m+1 row grid line Gatem+1, Gatem+1 exports high level, other row grid lines export low level,
Datan exports the n-th column data voltage of m+1 row, and VT3m+1n is opened, so that the cathode of OLEDm+1n is connect with ground terminal GND,
Electric current flow to OLEDm+1n through the VT2m+1n of R2m+1n and opening from power voltage terminal, to drive OLEDm+1n to shine, flows at this time
The electric current IOLED (m+1, n) for crossing OLEDm+1n is related to the n-th column data voltage of m+1 row that Datan is exported.
In Fig. 6, the merely exemplary m row n-th for showing the n-th column data line Datan and being exported when scanning m row grid line
The n-th column data voltage of m+1 row that column data voltage and Datan are exported when scanning m+1 row grid line, in practical operation
When, when scanning every a line grid line, Datan can export corresponding data voltage.
The specific embodiment of present invention display device as shown in Figure 5 is designed by special panel, corresponding timing of arranging in pairs or groups
Control, can carry out 100% load driving, this driving is not limited by scan electrode number, can independently be carried out to each pixel
Selective control can accurately control the luminous size of current of driving light-emitting component, to adjust ash by adjusting data voltage
Rank shows that regulative mode is simple.And the dot structure in the specific embodiment of present invention display device as shown in Figure 5 is simple,
Convenient for mask (exposure mask) design, and it can be realized current constant control, so that flowing through the luminous electric current of each light-emitting component not by panel
(display panel) line impedance influences.
Display driving method described in the embodiment of the present invention, applied to above-mentioned display device, the display driving method
Include: in the display cycle,
Conversion circuit in n-th of glow current control circuit is converted to the data voltage on the n-th column data line accordingly
The first electric current, the ratio control circuit in n-th of glow current control circuit controls the current value and stream of the first electric current
It crosses in proportionate relationship between the current value of the second electric current of the second branch in the ratio control circuit, and second electric current is mentioned
It is supplied to the n-th column pixel unit；
N is the positive integer less than or equal to N, and N is positive integer.
Specifically, m row the n-th column pixel unit may include m row the n-th column light-emitting component and the column conducting control of m row n-th
Circuit processed；In the m scan period that the display cycle includes,
M row grid line open, m row the n-th column turn-on control circuit control the n-th column of m row light-emitting component the second pole with
Tertiary voltage is connected between end, which is provided to the luminous member of the column of m row n-th by the n-th glow current control circuit
Part；
M is the positive integer less than or equal to M, and M is positive integer.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (11)
1. a kind of glow current control circuit, which is characterized in that including ratio control circuit and conversion circuit, wherein
The ratio control circuit includes the first branch and second branch, and the first branch is connect with the conversion circuit, institute
Second branch is stated to be connected to the light emitting element；
The ratio control circuit is used to control the current value for the first electric current for flowing through the first branch and flows through described second
It is in proportionate relationship between the current value of second electric current of branch；
The conversion circuit is also connect with data line, for the data voltage on the data line to be converted to first electricity
Stream.
2. glow current control circuit as described in claim 1, which is characterized in that the first branch include first resistor and
The first transistor, the second branch include second resistance and second transistor；
The first end of the first end of the first resistor and the second resistance is all connect with power voltage terminal；
The control electrode of the first transistor is connected with the control electrode of the second transistor；
First pole of the first transistor is connect with the second end of the first resistor, the first pole of the second transistor with
The second end of the second resistance connects；
Second pole of the first transistor is connect with the conversion circuit, and the second pole of the second transistor shines with described
Element connection.
3. glow current control circuit as claimed in claim 2, which is characterized in that the resistance value of the first resistor with it is described
The resistance value of second resistance is equal, and the type of the first transistor is identical as the type of the second transistor, and described first
The electric parameter of transistor is identical with the electric parameter of the second transistor.
4. the glow current control circuit as described in any claim in claims 1 to 3, which is characterized in that the conversion
Circuit includes operational amplifier, the first transfer resistance, the second transfer resistance and third transfer resistance；
The first input end of the operational amplifier is connect with the data line；
Second input terminal of the operational amplifier is connect by first transfer resistance with first voltage end, and the operation is put
Second input terminal of big device also passes through second transfer resistance and connect with the output end of the operational amplifier；The operation is put
The output end of big device is also connect by the third transfer resistance with second voltage end.
5. a kind of pixel circuit, which is characterized in that including any in light-emitting component, turn-on control circuit and such as Claims 1-4
Glow current control circuit described in claim；
First pole of the second branch and the light-emitting component in ratio control circuit that the glow current control circuit includes
Connection；
Second pole of the light-emitting component is connect with the first end of the turn-on control circuit, and the second of the turn-on control circuit
End is connect with tertiary voltage end；
The control terminal of the turn-on control circuit is connect with grid line, and the turn-on control circuit is for the grid on the grid line
Under the control of driving signal, controls and be connected between the second pole of the light-emitting component and the tertiary voltage end.
6. a kind of display device, which is characterized in that including N number of luminous electricity as described in any claim in Claims 1-4
Flow control circuit, display base plate, M row N column pixel unit, M row grid line and N column data line；It is the M row N column pixel unit, described
M row grid line and the N column data line are placed on the display base plate；
First pole of the light-emitting component that the pixel unit positioned at the n-th column includes all includes with n-th of glow current control circuit
Second branch connection in ratio control circuit；
Pixel unit positioned at m row is all connect with m row grid line；
Conversion circuit in n-th of glow current control circuit is connect with the n-th column data line；
M and N is positive integer, and m is the positive integer less than or equal to M, and n is the positive integer less than or equal to N.
7. display device as claimed in claim 6, which is characterized in that m row the n-th column pixel unit includes the column hair of m row n-th
Optical element and m row the n-th column turn-on control circuit；
The second branch and the m row n-th column hair in ratio control circuit that n-th of glow current control circuit includes
First pole of optical element connects；
Second pole of the m row the n-th column light-emitting component is connect with the first end of the m row the n-th column turn-on control circuit, institute
The second end for stating m row the n-th column turn-on control circuit is connect with tertiary voltage end；
The control terminal of the m row the n-th column turn-on control circuit is connect with m row grid line, the column of the m row n-th conducting control
Circuit is used under the control of the gate drive signal on the m row grid line, the control m row the n-th column light-emitting component
It is connected between second pole and the tertiary voltage end.
8. display device as claimed in claims 6 or 7, which is characterized in that the glow current control circuit is set to described
The neighboring area of display base plate.
9. display device as claimed in claims 6 or 7, which is characterized in that further include drive integrated circult；The glow current
Control circuit is integrated in the drive integrated circult.
10. a kind of display driving method, special applied to the display device as described in any claim in claim 6 to 9
Sign is, the display driving method include: in the display cycle,
Data voltage on n-th column data line is converted to corresponding by the conversion circuit in n-th of glow current control circuit
One electric current, the ratio control circuit in n-th of glow current control circuit control the current value of the first electric current and flow through this
It is in proportionate relationship between the current value of second electric current of the second branch in ratio control circuit, and second electric current is provided to
N-th column pixel unit；
N is the positive integer less than or equal to N, and N is positive integer.
11. display driving method as claimed in claim 10, which is characterized in that m row the n-th column pixel unit includes m row
N-th column light-emitting component and m row the n-th column turn-on control circuit；In the m scan period that the display cycle includes,
M row grid line is opened, and m row the n-th column turn-on control circuit controls the second pole and the third of the n-th column of m row light-emitting component
It is connected between voltage end, which is provided to m row the n-th column light-emitting component by the n-th glow current control circuit；
M is the positive integer less than or equal to M, and M is positive integer.
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| CN201910118129.5A CN109671397B (en) | 2019-02-15 | 2019-02-15 | Light emitting current control circuit, pixel circuit, display device, and display driving method |
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