CN110856453A - LED pixel package for implementing LED active matrix display - Google Patents
LED pixel package for implementing LED active matrix display Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
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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
- G09G2230/00—Details of flat display driving waveforms
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0439—Pixel structures
- G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
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Abstract
The present invention relates to an LED pixel package for implementing an LED active matrix display, and more particularly, to an LED pixel package including a signal control part for controlling an output signal and a signal output according to a signal input level; a light emission control section for controlling the LED light emission signal by using the output signal and the signal output; and a pixel configuration for controlling the magnitude and timing of the current flowing through each LED based on the LED light-emitting signal, thereby reducing the number of pins required and realizing LED active matrix display.
Description
Technical Field
The present invention relates to an LED pixel package for implementing an LED active matrix display, and more particularly, to an LED pixel package including a signal control part for controlling an output signal and a signal output according to a signal input level; a light emission control section for controlling the LED light emission signal by using the output signal and the signal output; and a pixel configuration for controlling the magnitude and timing of the current flowing through each LED based on the LED light-emitting signal, thereby reducing the number of pins required and realizing LED active matrix display.
Background
Recently, in order to improve the display quality of commercial indoor and outdoor display panels, pixels are getting smaller, but screens are getting larger.
In particular, in this application, LEDs are the most representative light emitting elements selected the most in order to achieve high luminance, high contrast, and good color reproducibility. In this case, a Passive Matrix (Passive Matrix) is the most widely used driving method in LED driving. The manual driving method is a method in which the driving circuit should be connected to each LED to be driven in such a manner that the LED formed at each pixel is directly controlled. Therefore, there is a fatal disadvantage that the driving circuit thereof is also configured in a small space as the pixel becomes smaller, and the power consumption increases.
Accordingly, recently, it is increasingly required to employ an Active Matrix (Active Matrix) for display using LEDs. In this case, the horizontal and vertical axes are controlled using the active element instead of directly controlling the LEDs constituting the pixel, thereby having an advantage that the control pins can be significantly reduced compared to the passive matrix method. Accordingly, the driving circuit for driving is greatly simplified, which is very advantageous in reducing the pixel size and the pixel pitch, and also can reduce power consumption at the same time.
Such an LED display becomes denser in the number of pixels as the interval between the respective LEDs becomes narrower, and as the luminance of the respective LEDs increases, the definition of the entire display increases and the image quality improves, and preferably, in the case of implementing the LED display in an active matrix, the LED display can be implemented more efficiently from both the physical size and the cost viewpoint.
For this purpose, the LED pixel package is required to be configured with pins for power supply, data input, ground, and the like, and furthermore, switch control pins for enabling and emission operations of the red LED, the green LED, and the blue LED, respectively, must be configured in the LED pixel package.
However, when the LED pixel package is implemented using the above-described configuration, the size thereof can be configured to be excessively large, so that there is a problem in that it is inefficient in terms of physical size and cost to implement an active matrix. Accordingly, a new LED pixel package is needed to solve this problem.
Disclosure of Invention
Technical problem
The present invention has been made to solve the problems of the prior art, and an object of the present invention is to provide an LED pixel package implemented using an active matrix that is not a passive matrix.
More specifically, the present invention determines an output signal and a signal output according to the level of a signal input, and generates an LED light emission signal by the output signal and the signal output, the light emission luminance of each LED being determined by the light emission signal of the LED, the light emission timing of each LED, and the LED light emission timing and data input, so that LED display is realized with an active matrix while the number of pins required for LED pixel packaging is reduced.
The problems to be solved by the present invention are not limited to the above-mentioned problems, and further problems not mentioned herein to be solved by the present invention will be clearly understood by those skilled in the art to which the present invention pertains from the following description.
Technical scheme
According to the present invention for solving the above-mentioned problems of the prior art, there is provided an LED pixel package for realizing an LED active matrix display, characterized in that an LED pixel package including 4 PINs (PINs) for inputting power, an input signal, input data, and ground to each LED pixel package includes: a signal control part including a switch part for determining an output signal and a switch for outputting the signal according to the level of the signal input, and an output part for determining the high-low signal output; a light emission signal unit including a 3-Bit Counter (3-Bit Counter) for receiving a signal output from the output unit as a clock input and including an output signal from the reception switch unit as a Reset input, and an Encoder (Encoder) for generating an LED light emission signal in accordance with an output of the 3-Bit Counter; and a pixel part including a red LED, a green LED, and a blue LED emitting light with corresponding brightness according to the magnitude of a flowing current, a red LED current generating part, a green LED current generating part, and a blue LED current generating part for generating currents respectively flowing in the red LED, the green LED, and the blue LED, and an Emission (Emission) switch, a green Emission switch, and a blue Emission switch for causing the generated currents to respectively flow in red of the red LED, the green LED, and the blue LED.
In the present invention, the switch unit is preferably configured to include a first NMOS (N-channel Metal Oxide Semiconductor) as an input signal received as the gate terminal.
In the present invention, it is preferable that the switching section includes a Schmitt-Trigger (Schmitt-Trigger) connected to a drain terminal of the first NMOS and an Inverter (Inverter) connected to an output terminal of the Schmitt-Trigger, and an output terminal of the Inverter corresponds to an output terminal of the switching section.
In the present invention, preferably, the output section includes: a first PMOS (P-channel Metal Oxide Semiconductor) and a second PMOS (P-channel Metal Oxide Semiconductor) which receive the power supply input as source terminals; a third NMOS and a fourth NMOS each having a drain terminal connected to each of the drain terminals of the first PMOS and the second NMOS; and a second NMOS having a drain terminal connected to a source terminal of the third NMOS transistor, and a drain terminal of the fourth NMOS corresponds to an output terminal of the output unit.
In the present invention, the LED light emitting signal is composed of a red Enable (Enable) signal, a green Enable signal, a blue Enable signal, and a reverse Emission (/ Emission) signal.
In the present invention, the red enable signal is input to a red LED current generating part; the green enabling signal is input to the green LED current generating part; the green enable signal is input to the blue LED current generating part.
In the present invention, the reverse emission signal is input to a red emission switch, a green emission switch, and a blue emission switch.
In the present invention, it is preferable that the configuration includes: a first pixel NMOS in which the red LED current generating part, the green LED current generating part, and the blue LED current generating part respectively receive LED emission signals as gate terminals and data inputs as drain terminals, and the source terminals are connected to a positive input of an amplifier; a second pixel NMOS having an output terminal connected to the gate terminal of the amplifier, a drain terminal connected to the LED, and a source terminal connected to the negative input terminal of the amplifier; an amplifier in which a source terminal output of the first pixel NMOS is received as a positive input and a source terminal output of the second pixel NMOS is received as a negative input, a gate terminal and an output terminal of the second pixel NMOS are connected; and a resistor disposed between the source terminal and the ground terminal of the second pixel NMOS.
In the present invention, it is preferable that the red emission switch, the green emission switch, and the blue emission switch receive the reverse emission signal as a gate terminal, respectively, and a drain terminal is connected to an output terminal of the amplifier within each LED current generation section, and a source terminal is configured as an NMOS connected to a ground terminal.
In the present invention, the 4 pins include: a power pin for an input power of the LED pixel package; a signal pin for an input signal of the LED pixel package; a data pin for input data of the LED pixel package data; and the grounding pin is used for grounding the LED pixel package.
In the present invention, the level of the signal input is divided into a first stage of 0V to 0.7V; a second stage of 0.7-1.4V; a third stage above 1.4V.
Effects of the invention
The signal control part of the present invention controls the output signal and the signal output according to the level of the signal input, and the light emission control part generates the LED light emission signal according to the output signal and the signal output, by which each LED of the pixel part emits light according to the timing corresponding thereto and the brightness corresponding to the data input, thereby having an effect of reducing the number of pins that the LED pixel package should include.
In addition, the present invention uses the above-described features to construct an LED active matrix display with an LED pixel package, so that the LED pixel package has an effect of reducing the number of pins to be included.
Drawings
Fig. 1 is a constitutional view of an LED pixel package for realizing an LED active matrix display according to an embodiment of the present invention;
FIG. 2 is a conceptual diagram of an LED pixel package for implementing an LED active matrix display according to one embodiment of the present invention;
FIG. 3 is a circuit diagram of an LED pixel package for implementing an LED active matrix display according to an embodiment of the present invention;
fig. 4 is an internal configuration diagram of a signal control section according to an embodiment of the present invention;
FIG. 5 is a schematic diagram showing signal input versus output signals and signal output of the signal control section in a graph;
fig. 6 is an internal configuration diagram of a light emission control section according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a 3-bit counter and an LED light emission signal that output signals and signals of a light emission control part according to an embodiment of the present invention, which are graphically displayed;
fig. 8 is an internal configuration diagram of a pixel portion according to an embodiment of the present invention;
FIG. 9 is a schematic diagram graphically illustrating the operation of an LED pixel package for an LED active matrix display implementation in accordance with an embodiment of the present invention;
FIG. 10 is a schematic diagram showing an implementation of an LED active matrix using an LED pixel package according to an embodiment of the present invention;
fig. 11 is a schematic diagram graphically illustrating operation of an LED active matrix implemented using an LED pixel package according to an embodiment of the present invention.
Most preferred embodiments
The present invention is characterized in that an LED pixel package including 4 PINs (PINs) for inputting power, an input signal, input data, and ground to each LED pixel package includes: a signal control part including a switch part for determining an output signal and a switch for outputting the signal according to the level of the signal input, and an output part for determining the high-low signal output; a light emission signal unit including a 3-Bit Counter (3-Bit Counter) for receiving a signal output from the output unit as a clock input and including an output signal from the reception switch unit as a Reset input, and an Encoder (Encoder) for generating an LED light emission signal in accordance with an output of the 3-Bit Counter; and a pixel part including a red LED, a green LED, and a blue LED emitting light with corresponding brightness according to the magnitude of a flowing current, a red LED current generating part, a green LED current generating part, and a blue LED current generating part for generating currents respectively flowing in the red LED, the green LED, and the blue LED, and an Emission (Emission) switch, a green Emission switch, and a blue Emission switch for causing the generated currents to respectively flow in red of the red LED, the green LED, and the blue LED.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before the present invention is explained in detail, terms or words used in the present specification and claims should not be construed as being limited to general or dictionary meanings, but interpreted as meanings and concepts conforming to the technical spirit of the present invention on the basis of the principle that the inventor is allowed to define terms concepts appropriately in order to explain his or her own invention in an optimum manner. Accordingly, the embodiments described in the present specification and the configurations illustrated in the drawings are only the most preferable embodiments of the present invention and do not represent all technical spirit of the present invention, and thus it should be understood that various equivalents and modifications may be substituted for them at the time of filing this application.
The terminology used in the description presented herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" may include the plural forms unless the context clearly dictates otherwise.
The present invention is characterized in that the LED pixel package 10 including 4 PINs (PINs) for inputting power, input signals, input data, and ground to each LED pixel package includes: a signal control unit including a switch unit 110 for determining an output signal and a switch for outputting a signal according to a level of a signal input, and an output unit 120 for determining a high/low signal output; a light emission signal section 200 which receives a signal output from the output section as a clock input, and includes a 3-Bit Counter (3-Bit Counter)210 which receives an output signal from the switch section as a Reset (Reset) input, and an Encoder (Encoder)220 which generates an LED light emission signal in accordance with an output from the 3-Bit Counter; and a pixel section 300 including a red LED310, a green LED311, and a blue LED312 emitting light at corresponding brightness according to the magnitude of the flowing current, a red LED current generating section 320 for generating currents flowing in the red LED, the green LED, and the blue LED, respectively, a green LED current generating section 321, and a blue LED current generating section 322, an Emission (Emission) switch 330 for causing the generated currents to flow in red of the red LED, the green LED, and the blue LED, respectively, a green Emission switch 331, and a blue Emission switch 332.
To assist in understanding this, fig. 1 is a constitutional view of an LED pixel package for realizing an LED active matrix display according to an embodiment of the present invention; FIG. 2 is a conceptual diagram of an LED pixel package for implementing an LED active matrix display according to one embodiment of the present invention; fig. 3 is a circuit diagram of an LED pixel package for implementing an LED active matrix display according to an embodiment of the present invention, which will be described with reference to the following drawings.
Fig. 4 is an internal configuration diagram of a signal control section according to an embodiment of the present invention, and the signal control section 100 includes a switching section 110 that determines switching of an output signal according to a level of a signal input to the LED pixel package 10 and an output section 120 that determines a level of a signal output.
Here, the switching unit 110 includes a first NMOS (N-channel metal Oxide Semiconductor) receiving a signal input as a gate terminal, the NMOS being an N-type metal Oxide Semiconductor field effect transistor, and is characterized in that when a negative voltage is applied to a positive voltage source at the gate, an N-channel inversion layer is formed in a region below the Oxide layer and a current flows through the N-channel inversion layer.
The switch unit includes a Schmitt-Trigger (Schmitt-Trigger) connected to a drain terminal of the first NMOS, and an inverter connected to an output terminal of the Schmitt-Trigger, and an output terminal of the inverter corresponds to an output terminal of the switch unit.
Schmitt triggers are characterized by an output response according to the magnitude and direction of the input signal having the characteristics of a hysteresis curve, and as a circuit that does not respond to transient noise, the output response has a relatively high threshold voltage when the input rises and a relatively low threshold voltage when the input falls.
In addition, the output part 120 includes a first PMOS (P-channel metal Oxide Semiconductor) and a second PMOS that receive a power input as source terminals; a third NMOS and a fourth NMOS each having a drain terminal connected to each of the drain terminals of the first PMOS and the second NMOS; and a second NMOS having a drain terminal connected to the source terminal of the third NMOS, in which case the drain terminal of the fourth NMOS corresponds to the output terminal of the output unit.
The PMOS refers to a semiconductor in which carriers flowing in a current path using an N-type substrate are not electrons but holes, and has a disadvantage in that a switching speed is slower than that of the NMOS, but has an advantage in that it is easy to connect a bipolar integrated circuit since the polarity of a power supply is positive, and in the present invention, it is used to control the operation and output of the output section 120.
Fig. 5 is a schematic diagram showing a signal input versus output signal and a signal output of the signal control section 100 having the above-described configuration in a graph, which will be described together with the operation of the signal control section as follows.
First, when the level of the signal input is a first level corresponding to 0V to 0.7V, the threshold voltage of the first NMOS corresponds to 0.7V, so that the first NMOS becomes an off state and the first PMOS becomes an on state, so that the output signal output is off and the signal output is low.
When the level of the signal input corresponds to the second level of 0.7V to 1.4V, a voltage equal to or higher than the threshold voltage of the first NMOS is applied, so that the first NMOS is turned on and the output signal output is turned on, but a voltage lower than 1.4V is still applied, so that the second NMOS and the third NMOS are turned off and the first PMOS is still turned on, so that the output signal output is low.
Finally, the second NMOS and the third NMOS become on-state at a third level where the signal input is 1.4V or more, and the first PMOS becomes off-state, so that the output signal output is on and the signal output is high.
As a result, the output signal of the switching section 110 is controlled to be on or off (equal to high or low) according to the voltage level of the applied signal input, while bringing about a result that the signal output of the output section 120 is controlled to be high or low.
In addition, fig. 6 is an internal configuration diagram of a light emission control section according to an embodiment of the present invention, and the light emission control section 200 includes a 3-bit counter 210 that receives a signal output of the output section 120 as a clock input and an output signal of the switch section 110 as a reset input; and an encoder 220 for generating an LED light signal according to the output of the 3-bit counter.
The counter refers to a configuration that counts the number of pulses of an input clock signal (input signal) and displays the value as an output, and in the present invention, an initialization signal, three enable signals, and one inverted transmission signal are separately generated by the encoder 220, and thus the 3-bit counter 210 should preferably be used.
The 3-bit counter 210 is a counter whose output value is represented by a binary value of 3 bits, and thus, in the present invention, the initialization signal of 3' b000, the red enable signal of 3' b001, the green enable signal of 3' b010, the blue enable signal of 3' b011, and the inverted Emission (/ Emission) signal of 3' b100 are generated by the above 3-bit counter and encoder 220.
In addition, the encoder 220 is a converter that converts a signal of a certain code series into a signal of another code series in a digital electronic circuit, and it has and outputs the characteristics of the signals corresponding to the outputs 3' b000, 3' b001, 3' b010, 3' b011, and 3' b100 of the 3-bit counter 210 in the present invention.
That is, as described above, in the encoder 220, if the output of 3' b000 of the 3-bit counter 210 is inputted, an initialization signal is generated; if the output of 3' b001 is input, a red enable signal is generated; if the output of 3' b001 is input, a green enable signal is generated; if the output of 3' b001 is input, a blue enable signal is generated; and if the output of 3' b001 is inputted, an emission signal is generated and transmitted to the pixel portion 300.
As described below, the red enable signal is input to the red LED current generating part 320 of the pixel unit 300; the green enable signal is input to the green LED current generating part 321; the blue enable signal is input to the blue LED current generating part 322, and the reverse emission signal is simultaneously input to the red emission switch 330, the green emission switch 331, and the blue emission switch 332.
Fig. 7 is a schematic diagram graphically showing a 3-bit counter 210 and an LED light emission signal 220 according to an output signal and a signal output of the light emission control section 200 having the above-described configuration, which will be described together with the operation of the signal control section as follows.
First, the clock input of the bit counter 210 is the signal output of the output section 120, and the reset input corresponds to the output signal of the switch section 110.
At this time, when the output signal of the switch unit 110 is turned off (or low) from on (or high), the 3-bit counter 210 is reset and initialized, and when the signal output of the output unit 120 is clocked, counting is started.
As the number of clocks increases, the 3-bit counter 210 outputs 3'b001, 3' b010, 3'b011, or 3' b100 corresponding thereto and communicates to the encoder 220, which then generates and communicates to the pixel section 30 a corresponding red LED enable signal, green enable signal, blue enable signal, or inverted emission signal.
Next, fig. 8 is an internal configuration diagram of a pixel portion according to an embodiment of the present invention.
As shown in the figure, the pixel section 300 is formed of a red LED310 and a constitution for driving it, a green LED311 and a constitution for driving it, and a blue LED312 and a constitution for driving it, and more specifically, has an LED current generating section as a constitution for driving each LED, respectively, and finally has respective emission switches for LED light emission.
Heretofore, the red LED310, the green LED311, and the blue LED312 in the present invention are configured to emit light with luminance proportional to the magnitude of current flowing to the respective LEDs, and as the name suggests, the red LED emits red light; the green LED emits green light; the blue LED emits blue light.
An LED or a light emitting diode is a semiconductor element that emits light by passing a current through a compound such as gallium arsenide, and is configured to inject minority carriers (electrons or holes) by using a p-n junction of an m semiconductor and to emit light by recombination of the minority carriers.
In the LED, if current passes through a conductive material having electrodes on upper and lower sides, a structure in which electrons and holes are combined at the center of the electrode to emit photons is formed, and the color of light is determined by the characteristics of the conductive material.
The LED utilized by the invention only limits the luminous color, has the characteristics of long service life and quick response as a common LED, and can be made into various shapes.
Such red LED310, green LED311, and blue LED312 are respectively arranged in the pixel portion 300 in the LED pixel package 10, and the light emission luminance and the light emission timing are controlled according to the level of signal input and the level of data input.
Each of the LED current generating sections has the same structure, and is characterized by including: a first pixel NMOS receiving an LED emission signal as a gate terminal and a data input as a drain terminal, the source terminal being connected with a positive input of the amplifier; a second pixel NMOS having an output terminal connected to the gate terminal of the amplifier, a drain terminal connected to the LED, and a source terminal connected to the negative input terminal of the amplifier; an amplifier in which a source terminal output of the first pixel NMOS is received as a positive input and a source terminal output of the second pixel NMOS is received as a negative input, a gate terminal and an output terminal of the second pixel NMOS are connected; and a resistor disposed between the source terminal and the ground terminal of the second pixel NMOS. .
In addition, the red emission switch 330, the green emission switch 331, and the blue emission switch 332 respectively receive the reverse emission signal as gate terminals, and the drain terminal is connected to the output terminal of the amplifier within each LED current generation section, and the source terminal is configured as an NMOS connected to a ground terminal.
Accordingly, the present invention has a feature of internally generating a red enable signal, a green enable signal, a blue enable signal, and a reverse light emission signal according to the level of a signal input to the LED pixel package 10, and fig. 9 based on the above-described constitution is a schematic diagram graphically displaying the operation of the LED pixel package for LED active matrix display implementation according to an embodiment of the present invention, and this will be briefly described as follows.
When a data input composed of an analog voltage is applied according to the signal input timing, the red, green, and blue enable signals are sequentially turned high (or turned on) and then voltages corresponding to the data input are stored in the capacitors (cst (r), cst (g), and cst (b)) included in the respective current generating sections.
Thereafter, when the reverse light emission signal is low, a current corresponding to the following equation is generated in each of the red LED310, the green LED311, and the blue LED312 as a ground terminal.
I(R/G/B)＝V@CST(R/G/B)/R(R/G/B)
As a result, the level of the data input is controlled to determine the magnitude of the currents flowing through the red, green, and blue LEDs 310, 311, and 312, thereby controlling the RGB brightness of the display, and the timing of the currents flowing through the red, green, and blue LEDs is determined according to the level of the signal input, thereby controlling the light emission timing of the display.
Finally, fig. 10 is a schematic diagram showing the implementation of an LED active matrix using an LED pixel package according to an embodiment of the present invention; fig. 11 is a schematic diagram graphically illustrating operation of an LED active matrix implemented using an LED pixel package according to an embodiment of the present invention.
As described above, the power pin 11, the signal pin 12, the data pin 13, and the ground pin 14 constitute one LED pixel package 10.
In order to realize an LED active matrix with the conventional configuration, it is necessary to configure pins for controlling the red enable switch, the green enable switch, the blue enable switch, and the emission switch (on/off control of the red emission switch 330, the green emission switch 331, and the blue emission switch 332), and therefore at least 8 or more pins must be configured. However, the present invention realizes an LED pixel package having only four pins in total by controlling a current flowing to each LED according to a voltage level of a signal input applied through a signal pin.
According to circumstances, it is made possible in the present invention that one signal control section 100 and one light emission control section 200 can control a plurality of pixel sections 300, and the number can be infinitely changed to optimize the physical size and cost of the display.
In addition, in the description of the present invention, the order of the LED light emission signals is red, blue, and green, but this is for convenience sake that the colors are sequentially distinguished, and it is preferable that the order of the voltage program may be changed.
In other words, the order of the voltage program is 1) red, green, blue, 2) red, blue, green, 3) green, red, blue, 4) green, blue, red, 5) blue, red, green, 6) blue, green, red, and these can of course be selectively utilized.
As a result, the signal control part of the present invention controls the output signal and the signal output according to the level of the signal input, and the light emission control part generates the LED light emission signal according to the output signal and the signal output, through which each LED of the pixel part emits light with the luminance corresponding to the timing and the data input corresponding thereto, thereby having an advantage of reducing the number of pins that the LED pixel package should include
In addition, the LED active matrix display of the invention is formed by utilizing the LED pixel package with the characteristics, thereby having the advantage of more effectively realizing LED display.
The invention has been described above with reference to specific embodiments, but it should be understood that the invention is not limited thereto.
The embodiments described above may be modified or changed by a person having ordinary skill in the art to which the present invention pertains without departing from the scope of the present invention, and various modifications and changes may be made within the technical spirit of the present invention and the equivalent scope of the patent claims described below.
Claims (11)
1. An LED pixel package for implementing an LED active matrix display,
LED pixel packages containing 4 PINs (PINs) for input power, input signal, input data and ground to each LED pixel package include:
a signal control part including a switch part for determining an output signal and a switch for outputting the signal according to the level of the signal input, and an output part for determining the high-low signal output;
a light emission signal unit including a 3-Bit Counter (3-Bit Counter) for receiving a signal output from the output unit as a clock input and including an output signal from the reception switch unit as a Reset input, and an Encoder (Encoder) for generating an LED light emission signal in accordance with an output of the 3-Bit Counter;
and a pixel part including a red LED, a green LED, and a blue LED emitting light with corresponding brightness according to the magnitude of a flowing current, a red LED current generating part, a green LED current generating part, and a blue LED current generating part for generating currents respectively flowing in the red LED, the green LED, and the blue LED, and an Emission (Emission) switch, a green Emission switch, and a blue Emission switch for causing the generated currents to respectively flow in red of the red LED, the green LED, and the blue LED.
2. An LED pixel package for implementing an LED active matrix display as claimed in claim 1,
the switch unit includes a first NMOS (N-channel Metal oxide semiconductor) as an input signal received by a gate terminal.
3. An LED pixel package for implementing an LED active matrix display as claimed in claim 2,
the switching part includes a Schmitt-Trigger (Schmitt-Trigger) connected to a drain terminal of the first NMOS and
and an Inverter (Inverter) connected to an output terminal of the schmitt trigger, wherein the output terminal of the Inverter corresponds to an output terminal of the switch unit.
4. An LED pixel package for implementing an LED active matrix display as claimed in claim 1,
the output section includes:
a first PMOS (P-channel Metal oxide semiconductor) and a second PMOS receiving the power supply input as source terminals;
a third NMOS and a fourth NMOS each having a drain terminal connected to each of the drain terminals of the first PMOS and the second NMOS; and
and a second NMOS having a drain terminal connected to a source terminal of the third NMOS transistor, and a drain terminal of the fourth NMOS corresponds to an output terminal of the output unit.
5. An LED pixel package for implementing an LED active matrix display as claimed in claim 1,
the LED luminous signal is composed of a red Enable (Enable) signal, a green Enable signal, a blue Enable signal and a reverse Emission (/ Emission) signal.
6. An LED pixel package for implementing an LED active matrix display as claimed in claim 5,
the red enabling signal is input to a red LED current generating part; the green enabling signal is input to the green LED current generating part; the green enable signal is input to the blue LED current generating part.
7. An LED pixel package for implementing an LED active matrix display as claimed in claim 5,
the reverse emission signal is input to a red emission switch, a green emission switch, and a blue emission switch.
8. An LED pixel package for implementing an LED active matrix display as claimed in claim 1,
the device is composed of: a first pixel NMOS in which the red LED current generating part, the green LED current generating part, and the blue LED current generating part respectively receive LED emission signals as gate terminals and data inputs as drain terminals, and the source terminals are connected to a positive input of an amplifier;
a second pixel NMOS having an output terminal connected to the gate terminal of the amplifier, a drain terminal connected to the LED, and a source terminal connected to the negative input terminal of the amplifier;
an amplifier in which a source terminal output of the first pixel NMOS is received as a positive input and a source terminal output of the second pixel NMOS is received as a negative input, a gate terminal and an output terminal of the second pixel NMOS are connected; and
and a resistor disposed between the source terminal and the ground terminal of the second pixel NMOS.
9. An LED pixel package for implementing an LED active matrix display as claimed in claim 1,
the red emission switch, the green emission switch, and the blue emission switch respectively receive the reverse emission signal as a gate terminal, and a drain terminal is connected to an output terminal of an amplifier within each LED current generation section, and a source terminal is configured as an NMOS connected to a ground terminal.
10. An LED pixel package for implementing an LED active matrix display as claimed in claim 1,
the 4 pins are configured to include:
a power pin for an input power of the LED pixel package;
a signal pin for an input signal of the LED pixel package;
a data pin for input data of the LED pixel package data;
and the grounding pin is used for grounding the LED pixel package.
11. An LED pixel package for implementing an LED active matrix display as claimed in claim 1,
the level of the signal input is divided into:
a first stage of 0V to 0.7V;
a second stage of 0.7-1.4V;
a third stage above 1.4V.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020180064893A KR101970713B1 (en) | 2018-06-05 | 2018-06-05 | Led pixel package for producing led active matrix display |
| KR10-2018-0064893 | 2018-06-05 | ||
| PCT/KR2018/007019 WO2019235679A1 (en) | 2018-06-05 | 2018-06-21 | Led pixel package for implementing led active matrix display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110856453A true CN110856453A (en) | 2020-02-28 |
| CN110856453B CN110856453B (en) | 2022-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201880003030.4A Active CN110856453B (en) | 2018-06-05 | 2018-06-21 | LED pixel package for implementing LED active matrix display |
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| Country | Link |
|---|---|
| KR (1) | KR101970713B1 (en) |
| CN (1) | CN110856453B (en) |
| WO (1) | WO2019235679A1 (en) |
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| KR102407383B1 (en) * | 2020-11-09 | 2022-06-10 | 한국광기술원 | Driver Chip Driving a Pixel and LED Module Including the Same |
| FR3125358A1 (en) * | 2021-07-16 | 2023-01-20 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Interactive display device and method of manufacturing such a device |
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- 2018-06-05 KR KR1020180064893A patent/KR101970713B1/en active IP Right Grant
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110856453B (en) | 2022-03-29 |
| WO2019235679A1 (en) | 2019-12-12 |
| KR101970713B1 (en) | 2019-04-22 |
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