CN114141199B - Micro-display passive pixel circuit - Google Patents
Micro-display passive pixel circuit Download PDFInfo
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- CN114141199B CN114141199B CN202111466765.0A CN202111466765A CN114141199B CN 114141199 B CN114141199 B CN 114141199B CN 202111466765 A CN202111466765 A CN 202111466765A CN 114141199 B CN114141199 B CN 114141199B
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- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 238000012549 training Methods 0.000 description 2
- 230000003190 augmentative effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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Classifications
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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]
- G09G3/3216—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 a passive matrix
Abstract
The invention relates to the technical field of electronic circuits, in particular to a micro-display passive pixel driving circuit. The invention provides a micro-display passive pixel driving circuit which comprises a Column Driver module, a Scan Driver module and a Pixel Circuit Array module, wherein the Column Driver module and the Scan Driver module are electrically connected with the Pixel Circuit Array module, and the Column Driver module comprises a PWM (pulse width modulation) realization circuit. The invention adopts PWM signals to control pixels, realizes PWM of input R, G, B data through a counter, and can carry out compensation correction by adjusting pulse width when the brightness is uneven or temperature drift occurs.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a micro-display passive pixel driving circuit.
Background
Micro light emitting diode (micro OLED) displays are the most promising next generation displays, and can be classified into passive driving (PMOLED) and active driving (AMOLED) according to driving modes.
The OLED micro-display chip has wide application, and is mainly used for military infrared gun aiming displays, digital individual helmet displays, military infrared, night vision devices, 3D simulation training and 5G virtual reality and augmented reality technology application in the military market. Meanwhile, under the 5G technical condition, the technology has a wide civil market. In the AR/VR field, the method can be used for a mobile Internet terminal display system, 3D glasses, a virtual game system and the like; in the consumer electronics field, it can be used for in-vehicle heads-up displays (HUD), high-end digital camera viewfinders (EVF), short-range projectors, etc.; the device can be used for fire protection, remote education and training, remote medical treatment (such as medical endoscope, etc.), industrial maintenance and detection, etc.
Passive driving has a low manufacturing cost, a simple circuit structure, but it generates bias voltage in a short time, and requires higher current and higher voltage to achieve average luminance on the panel, thus dissipating more power and rapidly degrading the OLED device.
At present, a DAC is often used to provide voltage and current for a pixel circuit, but the DAC has large temperature drift and is difficult to compensate, so that the phenomenon of uneven brightness is difficult to solve.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a micro-display passive pixel driving circuit.
The invention provides the following technical scheme:
the micro-display passive pixel driving circuit comprises a Column Driver module, a Scan Driver module and a Pixel Circuit Array module, wherein the Column Driver module and the Scan Driver module are electrically connected with the PixelCircuit Array module, and the Column Driver module comprises a PWM realization circuit;
the Column Driver module is used for driving each Column of LEDs in the OLED display screen to be turned on or off, namely driving Column electrodes connected with the Column Driver module by corresponding pixel brightness values;
the Scan Driver module is configured to generate a Scan signal, and sequentially provide the Scan signal to a plurality of Scan lines, that is, generate a control signal corresponding to the image signal;
the Pixel Circuit Array module is configured to obtain a signal sent by the driver, and output image information contained in a corresponding pixel according to the control signal.
Preferably, the Column Driver module includes a Shift Registers module, an Input Registers module, a Data Latches module, a pwmgs Registers module, a Level shifts module, and a Current Driver module, where the Shift Registers module, the Input Registers module, the Data Latches module, the pwmgs Registers module, the Level shifts module, and the Current Driver module are electrically connected in sequence.
Preferably, the Shift Registers module is configured to store a digital signal and output the digital signal outwards;
the Input Registers module is used for receiving Input data and selectively transmitting the Input data outwards;
the Data Latches module is used for latching display Data from a memory;
the PWM Generators module is used for generating output PWM signals, and the PWM implementation circuit is arranged in the PWM Generators module;
the Level shift module is used for converting a control signal of the time sequence control circuit into a high-Level signal and outputting the high-Level signal;
the Current Drivers module is used for generating pixel Current corresponding to an input signal.
Preferably, the external Input signal received by the Column Driver module is a 10-bit video data signal, and the 10-bit video data is stored in the Input Registers module.
Preferably, the PWM implementation circuit includes:
the Scan Driver module is electrically connected with the Scan signal lines;
a plurality of data signal lines electrically connected with the plurality of scanning signal lines respectively;
the PWM implementation circuit receives PWM input signals, the PWM input signals are respectively connected with the input end of the inverter and the grid electrode of the third transistor M3, the output end of the inverter is connected with a node on a data signal line, the capacitor is arranged between the output end of the inverter and the node of the data signal line, the input end of the inverter is further electrically connected with a pre-charge tube, and the pre-charge tube charges the capacitor connected with the node of the data signal line.
Preferably, two inverters are provided, one of the inverter input terminal and the gate of the third transistor M3 are connected to the PWM input signal, and the inverter output terminal is connected to the gate of the first transistor M1 and the input terminal of the other inverter, respectively.
Preferably, the source of the first transistor and the source of the second transistor are both connected to a mirrored current source of 5V, and the drain of the first transistor M1 is connected to a plurality of data signal lines.
Preferably, the Scan Driver module is further connected to a timing signal and a reset signal, and the Scan signal and the PWM signal control the TX1 tube and the TX2 tube respectively.
Preferably, the pixel circuit is further electrically connected with the clock signal generating circuit and the digital circuit module, respectively;
a clock signal generating circuit for generating a clock signal, receiving the RGB data signal by the Timing controller module and outputting the clock signal to the sourcedrecommer module;
the digital circuit module includes a digital circuit module generating a row signal and a digital circuit module generating a column signal.
Preferably, the digital circuit module is electrically connected with an and gate, two input ends of the and gate are respectively connected with the digital circuit module for generating row signals and the digital circuit module for generating column signals, an output end of the and gate is connected with a transmission gate, and the transmission gate receives the converted pixel current and regulates and outputs the pixel current according to signals generated by the digital circuit module.
The beneficial effects of the invention are as follows:
when pixel data is input, a PWM signal of R, G, B single pixels is realized through a counter, the realized PWM pulse width corresponds to a corresponding R, G, B value, and meanwhile, the pulse width can be adjusted under the condition of uneven brightness or temperature drift, and compensation correction is carried out;
and gates and transmission gates are arranged in the pixel circuits, an effect of optimizing charge injection phenomenon caused by parasitic capacitance is achieved, the influence of on-resistance and the charge injection phenomenon is reduced, an input signal with burrs or fluctuation is output to be a stable output signal, and then pixel current output to a pixel array is stable, so that the speed and the accuracy of building pixel voltage are improved.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a block diagram of the overall architecture of an OLED of the present invention;
FIG. 2 is a PWM implementation circuit of the present invention;
fig. 3 is a schematic diagram of a single pixel circuit of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
According to the embodiment shown in fig. 1, the micro-display passive pixel driving circuit includes a Column Driver module, a Scan Driver module, and a Pixel Circuit Array module, where the Column Driver module and the Scan Driver module are electrically connected to the Pixel Circuit Array module, the Column Driver module includes a PWM implementation circuit, and the Scan Driver module is further connected to a timing signal and a reset signal, where the Scan signal and the PWM signal control the TX1 tube and the TX2 tube, respectively.
The Column Driver module is used for driving each Column of LEDs in the OLED display screen to be on or off, namely driving Column electrodes connected with the Column Driver module by corresponding pixel brightness values;
the Scan Driver module is used for generating scanning signals and providing the scanning signals to a plurality of scanning lines in sequence, namely generating control signals corresponding to the image signals;
pixel Circuit Array module is used for obtaining the signal sent by the driver and outputting the image information contained in the corresponding pixel outwards according to the control signal.
The Column Driver module comprises a Shift Registers module, an Input Registers module, a DataLatches module, a PWM generator module, a Level Shift modules and a Current Driver module, and the Shift Registers module, the Input Registers module, the DataLatches module, the PWM generator module, the Level Shift modules and the Current Driver module are electrically connected in sequence.
The Shift Registers module is used for storing the digital signals and outputting the digital signals outwards;
the Input Registers module is used for receiving Input data and selectively transmitting the Input data outwards;
the Data Latches module is used for latching display Data from the memory;
the PWM Generators are used for generating output PWM signals, and the PWM implementation circuit is arranged in the PWM Generators;
the Level shift module is used for converting a control signal of the time sequence control circuit into a high-Level signal and outputting the high-Level signal;
and the Current driver module is used for generating pixel Current corresponding to the input signal.
The Column Driver module receives an external input signal as a 10-bit video data signal, and the 10-bit video data is stored in the InputRegisters module.
The Shift Registers module takes out the digital signal data according to the clock signal and transmits the digital signal to the InputRegisters module. The Input Registers module also receives a 10-bit video Data signal, the Input Registers module Registers the digital signal and the 10-bit video Data signal at the same time, and after receiving the time sequence signal, the Input Registers module transmits the digital signal and the 10-bit video Data signal to the Data Latches module.
The Data Latches module is connected with the single pixel circuit, and outputs corresponding Data after selection. In transmitting the data to the PWM Generators module, the pixel R, G, B data is PWM-enabled, and the generated pulse widths correspond to the data values of the pixels R, G, B, respectively. The generated PWM is supplied to a Level shift module which converts the Level of the PWM to a high Level.
The converted PWM is transmitted to a Current driver module, and Current is generated to flow into a pixel circuit, so that the pixel is lightened.
As shown in fig. 2, the PWM implementing circuit includes:
the Scan Driver module is electrically connected with the Scan signal lines;
a plurality of data signal lines electrically connected with the plurality of scanning signal lines respectively;
the PWM implementation circuit receives PWM input signals, the PWM input signals are respectively connected with the input end of the inverter and the grid electrode of the third transistor M3, the output end of the inverter is connected with a node on the data signal line, the capacitor is arranged between the output end of the inverter and the node of the data signal line, the input end of the inverter is further electrically connected with the pre-charge tube, and the pre-charge tube charges the capacitor connected with the node of the data signal line.
The inverter has two, one inverter input terminal and the gate of the third transistor M3 are both connected to the PWM input signal, and the inverter output terminal is connected to the gate of the first transistor M1 and the input terminal of the other inverter, respectively.
The source of the first transistor and the source of the second transistor are both connected with a 5V mirror current source, and the drain of the first transistor M1 is connected with a plurality of data signal lines.
Before the PWM signal is input, the pre-charge tube charges a capacitor connected with a node of the data signal line. The source of the third transistor M3 is connected with the voltage output by the pre-charge transistor, the grid electrode of the third transistor M3 is sequentially connected with two inverters, and the drain of the third transistor M3 is connected with the pixel circuit
After the PWM signals are input, the high-low level PWM signals are turned over without delay through the first inverter, and power consumption is reduced.
The mirror current source is connected with the source of the first transistor M1 and the source of the second transistor M2, the grid electrode of the first transistor is connected with the output end of the first inverter, and the drain electrode of the first transistor is connected with the pixel circuit. The drain of the second transistor M2 is connected to the power supply cathode.
Wherein, the calculation formula of the capacitance value in the PWM realization circuit:
Cgd_sum=(N-1)*Cpara<0>；
where Cpara is the capacitance value of the parasitic capacitance, cgd_sum is the capacitance value between the gate and the drain of the first transistor M1 of the pixel switching element.
As shown in fig. 3, the pixel circuit is also electrically connected to the clock signal generation circuit and the digital circuit module, respectively;
the clock signal generating circuit is used for generating a clock signal, receiving the RGB data signal by the Timing controller module and outputting the clock signal to the sourcedrecommerce module;
the digital circuit module includes a digital circuit module generating a row signal and a digital circuit module generating a column signal.
The digital circuit module is electrically connected with the AND gate, two input ends of the AND gate are respectively connected with the digital circuit module for generating row signals and the digital circuit module for generating column signals, the output end of the AND gate is connected with the transmission gate, and the transmission gate receives the converted pixel current and adjusts and outputs the pixel current according to the signals generated by the digital circuit module.
In the frame 1, the MOS transistor adopts a low-voltage transistor with a specification of 1.5V, and in the frame 2, the MOS transistor adopts a high-voltage transistor with a specification of 5V.
The time sequence signals are transmitted to the digital circuit modules, the two digital circuit modules respectively generate row signals and column signals, the row signals and the column signals are simultaneously gated, namely the input ends of the AND gates are both input with high level, and the output ends of the AND gates output signals with high level.
At the moment, the pixel circuit receives the pixel current of single pixel data, and transmits the pixel current to the transmission gate circuit together with a high-level output signal at the output end of the AND gate, and the on-resistance is reduced and the charge injection phenomenon is relieved through the transmission gate circuit, so that the speed and the precision of establishing the pixel voltage are improved.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The micro-display passive pixel driving circuit is characterized by comprising a Column Driver module, a Scan Driver module and a Pixel Circuit Array module, wherein the Column Driver module and the Scan Driver module are electrically connected with the Pixel Circuit Array module, and the Column Driver module comprises a PWM (pulse-width modulation) realization circuit;
the Column Driver module comprises a Shift Registers module, an Input Registers module, a Data Latches module, a PWM (pulse-Width modulation) Generators module, a Level Shift Registers module and a Current Driver module, wherein the Shift Registers module, the Input Registers module, the Data Latches module, the PWM Generators module, the Level Shift modules and the Current Drivers module are electrically connected in sequence and are used for driving each Column of LEDs in an OLED display screen to be turned on or off, namely driving Column electrodes connected with the Column Drivers module by corresponding pixel brightness values;
the Scan Driver module is configured to generate a Scan signal, and sequentially provide the Scan signal to a plurality of Scan lines, that is, generate a control signal corresponding to the image signal;
the Pixel Circuit Array module is used for acquiring signals sent by the driver and outputting image information contained in corresponding pixels outwards according to the control signals;
the Shift Registers module is used for storing digital signals and outputting the digital signals outwards;
the Input Registers module is used for receiving Input data and selectively transmitting the Input data outwards;
the Data Latches module is used for latching display Data from a memory;
the PWM Generators module is used for generating output PWM signals, and the PWM implementation circuit is arranged in the PWM Generators module;
the Level shift module is used for converting a control signal of the time sequence control circuit into a high-Level signal and outputting the high-Level signal;
the Current Drivers module is used for generating pixel currents corresponding to the input signals;
the Columbn Driver module receives an external Input signal which is a 10-bit video data signal, and the 10-bit video data is stored in the Input Registers module;
the Scan Driver module is also connected with a time sequence signal and a reset signal, and the scanning signal and the PWM signal respectively control a TX1 tube and a TX2 tube;
the PWM implementation circuit includes:
the Scan Driver module is electrically connected with the Scan signal lines;
a plurality of data signal lines electrically connected with the plurality of scanning signal lines respectively;
the PWM implementation circuit receives PWM input signals, the PWM input signals are respectively connected with the input end of the inverter and the grid electrode of the third transistor M3, the output end of the inverter is connected with a node on a data signal line, the capacitor is arranged between the output end of the inverter and the node of the data signal line, the input end of the inverter is further electrically connected with a pre-charge tube, and the pre-charge tube charges the capacitor connected with the node of the data signal line.
2. A micro-display passive pixel driving circuit according to claim 1, wherein two inverters are provided, one of the inverter input terminal and the gate of the third transistor M3 is connected to the PWM input signal, and the inverter output terminal is connected to the gate of the first transistor M1 and the input terminal of the other inverter, respectively.
3. The micro-display passive pixel driving circuit according to claim 2, wherein the source of the first transistor and the source of the second transistor are both connected to a mirror current source of 5V, and the drain of the first transistor M1 is connected to a plurality of the data signal lines.
4. The micro-display passive pixel driving circuit according to claim 1, wherein the pixel driving circuit is further electrically connected to the clock signal generating circuit and the digital circuit module, respectively;
the clock signal generating circuit is used for generating a clock signal, receiving the RGB data signal by the Timing controller module and outputting the clock signal to the Source driver module;
the digital circuit module includes a digital circuit module generating a row signal and a digital circuit module generating a column signal.
5. The micro-display passive pixel driving circuit according to claim 4, wherein the digital circuit module is electrically connected with an and gate, two input ends of the and gate are respectively connected with the digital circuit module generating a row signal and the digital circuit module generating a column signal, and an output end of the and gate is connected with a transmission gate, and the transmission gate receives the converted pixel current and adjusts and outputs the pixel current according to the signal generated by the digital circuit module.
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