CN102013206A - LED digital perpetual calendar directly driven by control chip and implementation method thereof - Google Patents

LED digital perpetual calendar directly driven by control chip and implementation method thereof Download PDF

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CN102013206A
CN102013206A CN2010105809724A CN201010580972A CN102013206A CN 102013206 A CN102013206 A CN 102013206A CN 2010105809724 A CN2010105809724 A CN 2010105809724A CN 201010580972 A CN201010580972 A CN 201010580972A CN 102013206 A CN102013206 A CN 102013206A
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control chip
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address wire
display dot
led
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CN102013206B (en
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刘俭良
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Abstract

The invention discloses an LED digital perpetual calendar directly driven by a control chip and an implementation method thereof. The LED digital perpetual calendar comprises a control chip, a control chip system circuit, a power supply circuit and a display module, wherein the control chip system circuit and the display module are connected to the control chip; the power supply circuit is respectively connected with the control chip and the control chip system circuit; and in the LED digital perpetual calendar, the LED digital perpetual calendar control chip with strong driving capability, a special display scanning mode and a corresponding circuit connecting mode are adopted. By adopting the LED digital perpetual calendar, the required luminescence power is achieved under the condition of not increasing the driving circuit, thereby simplifying the circuit design of the LED digital perpetual calendar and the production process of a circuit plate.

Description

The digital perpetual calendar of the LED that directly drives by control chip and its implementation
Technical field
The present invention relates to a kind of digital LED time display apparatus, the in particular a kind of digital perpetual calendar of LED and its implementation that directly drives by control chip.
Background technology
Referring to Fig. 1, it is the composition frame chart of the digital perpetual calendar of existing LED, it mainly comprises circuit such as control chip, thermometric, city's electro-detection, keyboard, and the display circuit that constitutes by light emitting diode and LED charactron, between described control chip and display circuit, be provided with a display driver circuit, be used for driven for emitting lights diode and LED charactron, satisfy the requirement of its luminous power.
Existing several typical display driver circuit comprises: constitute display driver circuit by triode and chip for driving, constituted driving circuit separately or constituted display driver circuit separately by triode by chip for driving.These several prior aries all have a common feature: be provided with display driver circuit between control chip and the display unit.
And more and more fierce along with the digital perpetual calendar market competition of LED, increase the cost that a circuit component all can increase product more, influence the reliability of circuit, thereby reduce the competitiveness of product in market.And existing circuit logic structures shape, when drawing the single face circuit board, must use wire jumper, production is a very time-consuming job to the plant wire jumper for streamline, thereby has reduced production efficiency.Therefore, prior art has yet to be improved and developed.
Summary of the invention
The object of the present invention is to provide a kind of digital perpetual calendar of LED and its implementation that is directly driven by control chip, being intended to solve the digital perpetual calendar of existing LED increases cost lifting and the processing time consuming problem that a display driver circuit is caused between control chip and display circuit.
Technical scheme of the present invention is as follows:
A kind of digital perpetual calendar of LED that directly drives by control chip, it comprises control chip, control chip circuit system, power circuit and display module, described control chip circuit system and display module are connected to control chip, described power circuit connects control chip, control chip circuit system respectively
Wherein, described display module is a display matrix, and display dot is aligned in the display matrix that is made of n bar address wire and m bar data line, a pin of display dot is connected on the address wire, another pin is connected on the data line, the display dot in the described display module add up to 30 to 260
The I/O mouth that is used for the gated sweep order in the described control chip is the scanning sequency control port, the I/O mouth that is used for display dot light on and off control is display dot light on and off control ports, the address wire of described display module is connected directly to the scanning sequency control port one to one, and the data line of described display module is connected directly to display dot light on and off control port one to one.
A kind of digital perpetual calendar implementation method of LED that directly drives by control chip, the quantity of the display dot of the digital perpetual calendar of described LED is D, it may further comprise the steps:
Step S100: display dot is aligned in the display matrix that is made of n bar address wire and m bar data line, a pin of display dot is connected on the address wire, another pin is connected on the data line, wherein, in the display matrix of the digital perpetual calendar of described LED display dot add up to 30 to 260, n and m are natural number;
Step S200: select control chip, with drive current in the control chip greater than 0.3 * (c X1/ q X1+ c X2/ q X2+ ... + c Xm/ q Xm) * T 0/ T xThe I/O mouth as x scanning sequency control port of control chip, and be connected with x bar address wire in the display matrix, described control chip scans demonstration by the order that is connected to the address wire on the scanning sequency control port, wherein, c X1, c X2..., c XmRepresent on the x bar address wire be connected respectively to the 1st, 2 ..., the display dot on the m bar data line the parameter of electric current-brightness transition efficient; q X1, q X2..., q XmRepresent on the x bar address wire be connected respectively to the 1st, 2 ..., the display dot on the m bar data line is to showing time T xUtilization factor, T xBe meant the demonstration time of distributing to display dot on the x bar address wire, T 0Be meant that display matrix shows the cycle of a frame, x is any natural number in interval [1, n].
Beneficial effect of the present invention: the present invention is by adopting the special reading scan mode and the related circuit connected mode of the digital perpetual calendar control chip of LED, the digital perpetual calendar of LED can not increased under the situation of driving circuit also can reach needed luminous power, thereby effectively reduced its production cost, improve the efficient of producing, and strengthened the stability of circuit.
Description of drawings
Fig. 1 is the functional block diagram of the digital perpetual calendar of existing LED.
Fig. 2 is the functional block diagram of the digital perpetual calendar of the LED that provides of the embodiment of the invention.
Fig. 3 is the circuit theory diagrams of the digital perpetual calendar of first kind of LED that provides of the embodiment of the invention.
Fig. 4 is the circuit theory diagrams of the digital perpetual calendar of second kind of LED that provides of the embodiment of the invention.
Fig. 5 is the circuit theory diagrams of the digital perpetual calendar of the third LED that provides of the embodiment of the invention.
Fig. 6 is the circuit theory diagrams of the digital perpetual calendar of the 4th kind of LED that provides of the embodiment of the invention.
Fig. 7 is the circuit theory diagrams of the digital perpetual calendar of the 5th kind of LED that provides of the embodiment of the invention.
Fig. 8 is the circuit theory diagrams of the digital perpetual calendar of the 6th kind of LED that provides of the embodiment of the invention.
Fig. 9 is the circuit theory diagrams of the digital perpetual calendar of the 7th kind of LED that provides of the embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, clear and definite, below develop simultaneously with reference to accompanying drawing that the present invention is described in more detail for embodiment.
The digital perpetual calendar product of LED is a kind of consumer electronics product, the display circuit that constitutes by control chip, driving circuit, light emitting diode and the LED charactron of built-in computer program or control logic circuit, input keyboard, and circuit such as temperature measurement circuit, power circuit constitute, and can be used to show automatically the Gregorian calendar and lunar calendar date, week, time, environment temperature, 24 solar term and to the fate equal time calendar information reciprocal of next solar term.
Figure 2 shows that the functional block diagram of the digital perpetual calendar of LED that the embodiment of the invention provides, it comprises: control chip, Keysheet module, option identification circuit, city's power detection circuit, sound playing circuit, temperature measurement circuit, control chip circuit system, power circuit and display module.Described Keysheet module, described option identification circuit, described city power detection circuit, described sound playing circuit, described temperature measurement circuit, described control chip circuit system, described power circuit and described display module all are connected to the described control chip of the digital perpetual calendar of this LED.
Described control chip is built-in with computer program, control logic circuit and related data, is the master controller of entire product, and this class control chip has multiple, for well known to those of ordinary skill in the art.Under the control of built-in computer program, control logic circuit, control chip is finished following work: the operation of walking the time and the Gregorian calendar, the lunar calendar, week, solar term, timing quarter-bell etc. is calculated, and environment temperature is measured; Send information such as time, calendar, temperature to display circuit, show at display unit; Receive and handle push button signalling; Play sound as requested; Detect in real time civil power, and can when mains failure, control total system immediately and enter low power consumpting state, under the situation of reserve battery power supply, continue to walk time and date, and preserve various related datas and do not lose.
Described control chip circuit system is used to keep the circuit of control chip operate as normal, comprises oscillatory circuit, reset circuit etc.
Described city power detection circuit is used for detecting in real time civil power under the control of control chip.When civil power was arranged, control chip was in the high speed operation pattern, walk the time calendar and show, thermometric, processing keyboard even play sound etc., the total system power consumption is bigger; When the civil power power down, control chip can the quick control total system enter low power consumpting state, only depends on standby powered battery to walk time and calendar.System continues to detect in real time civil power after entering low power consumpting state, in case detect civil power, control chip enters the high speed operation pattern immediately.
Described Keysheet module is used under the control of control chip, receives push button signalling from keyboard circuit, system is carried out operations such as timing, timing.
Described temperature measurement circuit is used under the control of control chip, by the temperature sensor testing environment temperature in the circuit.
Described option identification circuit is to provide various function choosing-items promptings in the mode of external particular electrical circuit to control chip.The same function of the digital perpetual calendar of general LED has multiple option, for example: week mode the method for expressing of Chinese style is arranged: day (charactron shows " 8 "), 1,2,3,4,5,6 corresponding Sundays are to Saturday; The method for expressing that also has Vietnam's formula: 8,2,3,4,5,6,7 corresponding Sundays are to Saturday.In order to allow the intention work of control chip according to the user, give control chip periphery design one group of control chip can detect the circuit that obtains, for example one group of resistance or electric capacity, control chip can be according to the difference of detected external preferences circuit, select different drive controlling programs for use, to realize different functions.
Described power circuit is used for providing power supply to total system, and it comprises: civil power transformation, rectification, voltage stabilizing, provide the power supply of enough power to control chip; System also is provided with standby button battery, is used for the reliable power supply under the energy safeguards system low-power consumption work when mains failure.
Described sound playing circuit is used for playing sound in needs under the control of control chip, as speech chronopher, playing back music etc.
Described display module is used for information such as Time of Day are shown by lighting display dot.Described display module is a display matrix, comprising display dot, described display dot be can independent displaying in the digital perpetual calendar display module of described LED minimum flat light emission, each display dot in the described display module is made up of a light emitting diode or is formed the i.e. combination of light emitting diode or light emitting diode by a plurality of light emitting diode series connection, parallel connection or string and series-parallel connection; Arbitrarily definite numerical value between display dot in the described display module adds up to and adopts 30 to 260, and display dot is aligned in the display matrix that is made of n bar address wire and m bar data line, a pin of display dot is connected on the address wire, another pin is connected on the data line, wherein to count the scope of n be to determine arbitrarily numerical value in 2 to 78 to address wire, the scope of number of data lines m be 2 to 78 determine numerical value arbitrarily; Must explanation be, the numerical value of above-mentioned m and n determines when circuit design according to the actual needs, and according to the actual needs, the display dot on every address wire or every the data line might not adopt identical quantity.
The I/O mouth that is used for the gated sweep order in the described control chip is called the scanning sequency control port, the I/O mouth that is used to control the display dot light on and off is called display dot light on and off control port, the address wire of described display module is connected directly to the scanning sequency control port one to one, and the data line of described display module is connected directly to display dot light on and off control port one to one.
The I/O mouth of described control chip must be no less than n+m, and in the control chip drive current greater than 0.3 * (c X1/ q X1+ c X2/ q X2+ ... + c Xm/ q Xm) * T 0/ T xThe I/O mouth be connected with x bar address wire in the display matrix, drive current is greater than c 1y* T 0/ (q 1y* T 1), c 2y* T 0/ (q 2y* T 2) ..., c Ny* T 0/ (q Ny* T n) in peaked I/O mouth be connected with y bar data line in the display matrix, wherein, n is the quantity of the address wire that is connected to control chip scanning sequency control port on the display module, and m is the quantity of the data line that is connected to control chip light on and off control port on the display module, c 1y, c 2y..., c NyFor on the y bar data line in the display module be connected respectively to the 1st, 2 ..., n bar address wire the electric current-brightness transition efficiency parameters c of display dot, T 1, T 2..., T nFor distribute to the 1st, 2 ..., the display dot on the n bar address wire the demonstration time, q 1y, q 2y..., q NyBe on the y bar data line be connected respectively to the 1st, 2 ..., the display dot on the n bar address wire is to distributing to their demonstration time T 1, T 2... T nUtilization factor, c X1, c X2..., c XmRepresent on the x bar address wire be connected respectively to the 1st, 2 ..., the display dot on the m bar data line the parameter of electric current-brightness transition efficient, q X1, q X2..., q XmRepresent on the x bar address wire be connected respectively to the 1st, 2 ..., the display dot on the m bar data line is to showing time T xUtilization factor, T xBe meant that demonstration time of distributing to display dot on the x bar address wire, (the demonstration time of distributing to display dot on the address wire was meant at a display frame period T 0In have show that electric current flows through the time of this address wire), T 0Be meant that display matrix shows the cycle of a frame, x is any natural number in interval [1, n], and y is any natural number in interval [1, m].
The digital perpetual calendar of described LED is according to its circuit connecting mode difference of difference of the driving force of the high/low level of control chip:
When the low level driving force of control chip was strong, described scanning sequency control port adopted low level to drive, and the negative electrode of described display dot is connected on the address wire, and anode is connected on the data line.One to one be connected directly to scanning sequency control port control chip on the address wire of display module this moment, and the data line line that will connect display module is connected directly to the display dot light on and off control port on the control chip one to one.Referring to Fig. 3, address wire (promptly from COM1 to the COMn) correspondence that connects the display dot negative electrode in the present embodiment in the display module is connected to the scanning sequency control port (being the COM1 to COMn on the control chip) on the control chip; Data line (promptly from S1 to the Sm) correspondence of connection display dot anode is connected to the display dot light on and off control port (being the S1 to Sm on the control chip) on the control chip in the while display module.
When the high level driving force of control chip is stronger, described scanning sequency control port adopts high level to drive, and the anode of described display dot is connected on the address wire, and negative electrode is connected on the data line.One to one be connected directly to scanning sequency control port control chip on the address wire of display module this moment, and the display module data line is connected directly to display dot light on and off control port on the control chip one to one.Referring to Fig. 4, address wire (promptly from COM1 to the COMn) correspondence that connects the display dot anode in the present embodiment in the display module is connected to the scanning sequency control port (being the COM1 to COMn on the control chip) on the control chip; Data line (promptly from S1 to the Sm) correspondence of connection display dot negative electrode is connected to the display dot light on and off control port (being the S1 to Sm on the control chip) on the control chip in the while display module.
Except two kinds of above-mentioned control chips, also there is a kind of control chip, its part I/O mouth is that the low level driving force is stronger, and part I/O mouth is that the high level driving force is stronger.The mode that two kinds of circuit connecting forms that then adopt Fig. 3 and Fig. 4 and provided for this chip combine is handled, for example shown in Figure 5, the low level driving force of the scanning sequency control port COM3 of control chip is strong, so drive the address wire COM3 of display module with low level, other scanning sequency control port high level driving force of control chip is strong, so drive other address wire of display module with high level.Connect the anode of display dot on the address wire that high level drives, connect the display dot negative electrode on the address wire that low level drives, another pin of these display dot is received on the respective data lines.When scanning showed, address wire was when output shows level in turn on the display module, and the address wire that high level drives is the output high level, and the address wire that low level drives is an output low level; Display dot on the address wire that will light the high level driving, corresponding data line is wanted output low level, the display dot on the address wire that will light the low level driving, corresponding data line will be exported high level.
Each display dot among Fig. 3, Fig. 4 and Fig. 5 can be regarded as by a light emitting diode and form or be made up of a plurality of light emitting diode series connection, parallel connection, string and series-parallel connection.
The structure that has comprised the display module of forming by seven section 8 font charactron among Fig. 3, Fig. 4 and Fig. 5 equally, as: among Fig. 3, one altogether seven sections LED charactrons of anode be equivalent among the figure any 7 display dot on same the data line, seven sections LED charactrons of a common cathode are equivalent among the figure any 7 display dot on same the address wire; Among Fig. 4, one altogether seven sections LED charactrons of anode be equivalent among the figure any 7 display dot on same the address wire, seven sections LED charactrons of a common cathode are equivalent among the figure any 7 display dot on same the data line.
When the display dot that constitutes display module not only comprised light emitting diode but also comprises seven segment digital tubes, according to the type difference of charactron, circuit connecting mode was also different:
Seven segment digital tubes commonly used on the market has two kinds of polarity, common cathode type and common anode type.During common cathode charactron operate as normal, electric current is the anode inflow of display segment from the display segment control pin of respectively lighting, and is the negative electrode outflow of each display segment from the charactron common port; When being total to anode charactron operate as normal, electric current is the anode inflow of each display segment from the charactron common port, is the negative electrode outflow of display segment from the display segment control pin of respectively lighting.
The embodiment of the invention is that example is described with the digital perpetual calendar product of LED the most frequently used on the market.This product comprises date, Hour Minute Second, moon month day, week, temperature, quarter-bell indication on schedule, the indication of timing quarter-bell, the blank character ": " between the time-division, between second branch (being called " second sudden strain of a muscle " herein).When adopting 12 hours standards, the display dot number that needs altogether is 122, and when adopting 24 hours standards, it is 124 that the demonstration that needs is altogether counted.Be that example is carried out design description now with 24 hours standards:
First kind of situation: control chip adopts " low " level to drive, and the LED charactron is that the circuit logic structure is when being total to anode:
Anode LED charactron display segment control pin is or/and the address wire of the negative electrode of light emitting diode is connected directly to the scanning sequency control port on the control chip altogether in connection in the described display module, and connection is total to the common port of anode LED charactron or/and the data line of the anode of light emitting diode is directly connected to the display dot light on and off control port on the control chip.Order by address wire when scanning shows scans.
As shown in Figure 6, the digital perpetual calendar of this LED comprises 124 display dot, the display module that display dot is formed is that the structure of 7 address wires and 18 data lines is called for short 7 * 18 project organization, because being low level, the scanning sequency control port of control chip drives, so connection is total to the display segment control pin of anode LED charactron or/and 7 address wires of the negative electrode of light emitting diode need be connected to the scanning sequency control port of control chip, promptly among the figure COM1 of control chip to COM7, the common port that connects anode LED charactron altogether is or/and 18 data lines of the anode of light emitting diode are connected to the light on and off control port of control chip, promptly among the figure S1 of control chip to S18.
Except above-mentioned 7 * 18 project organization, in order to satisfy 124 display dot, can also be designed to i.e. 14 * 9 the project organization of 14 address wires (i.e. the demonstration hop count of two row's charactrons) and 9 data lines, perhaps 21 address wires (i.e. the three demonstration hop counts of arranging charactrons) and 6 data lines are 21 * 6 project organization etc.
Second kind of situation: control chip adopts " low " level to drive, and the circuit logic structure was when charactron was common cathode:
The common port that connects common cathode LED charactron in the described display module is or/and the address wire of the negative electrode of light emitting diode is connected directly to the scanning sequency control port on the control chip, and the display segment control pin that connects common cathode LED charactron is or/and the data line of the anode of light emitting diode is directly connected to the display dot light on and off control port on the control chip.Order by address wire when scanning shows scans.
As described in Figure 7, the digital perpetual calendar of this LED comprises 124 display dot, the display module that display dot is formed is that the structure of 9 address wires and 14 data lines is called for short 9 * 14 project organization, because being low level, the scanning sequency control port of control chip drives, so the common port that connects common cathode LED charactron is or/and 9 address wires of the negative electrode of light emitting diode need be connected to the scanning sequency control port of control chip, promptly among the figure COM1 of control chip to COM9, the display segment control pin that connects common cathode LED charactron is or/and 14 data lines of the anode of light emitting diode are connected to the light on and off control port of control chip, promptly among the figure S1 of control chip to S14.
Except above-mentioned 9 * 14 project organization, in order to satisfy 124 display dot, can also be designed to i.e. 18 * 7 the project organization (this structure code pipe is all on a row) of 18 address wires and 7 data lines, perhaps i.e. 6 * 21 the project organization (this structure code pipe is divided into three rows) etc. of 6 address wires and 21 data lines.
Any circuit under the circuit logic structure of above-mentioned first and second two kinds of situations all has following common ground: be exactly when reading scan, rotation output low level by the scanning sequency control port, the level of each corresponding display dot light on and off control port is then according to wanting content displayed to determine: need light and just export high level, not light with regard to output low level or be arranged to high-impedance state.
The third situation: control chip adopts " height " level to drive, and charactron is that the circuit logic structure is when being total to anode:
Anode LED charactron common port is or/and the address wire of the anode of light emitting diode is connected directly to the scanning sequency control port on the control chip altogether in connection in the described display module, and connection is total to the display segment control pin of anode LED charactron or/and the data line of the negative electrode of light emitting diode is directly connected to the display dot light on and off control port on the control chip.Order by address wire when scanning shows scans.
As shown in Figure 8, the digital perpetual calendar of this LED comprises 124 display dot, the display module that display dot is formed is that the structure of 6 address wires and 21 data lines is called for short 6 * 21 project organization, because being high level, the scanning sequency control port of control chip drives, so connect anode LED charactron altogether common port or/and the scanning sequency control port that 6 address wires of the anode of light emitting diode need be connected to control chip promptly among the figure COM1 of control chip to COM6, the display segment control pin that connects anode LED charactron altogether is or/and 21 data lines of the negative electrode of light emitting diode are connected to the light on and off control port of control chip, promptly among the figure S1 of control chip to S21.
Except above-mentioned 6 * 21 project organization, in order to satisfy 124 display dot, can also be designed to i.e. 9 * 14 the project organization of 9 address wires and 14 data lines, perhaps i.e. 18 * 7 the project organization etc. of 18 address wires and 7 data lines.
The 4th kind of situation: control chip adopts " height " level to drive, and the circuit logic structure was when charactron was common cathode:
Connect common cathode LED charactron display segment control pin in the described display module or/and the address wire of the anode of light emitting diode is connected directly to the scanning sequency control port on the control chip, the common port that connects common cathode LED charactron is or/and the data line of the negative electrode of light emitting diode is directly connected to the display dot light on and off control port on the control chip.Order by address wire when scanning shows scans.
As shown in Figure 9, the digital perpetual calendar of this LED comprises 124 display dot, the display module that display dot is formed is that the structure of 7 address wires and 18 data lines is called for short 7 * 18 project organization, because being high level, the scanning sequency control port of control chip drives, so 7 address wires of the display segment control pin of connection common cathode LED charactron and the anode of light emitting diode need be connected to the scanning sequency control port of control chip, promptly among the figure COM1 of control chip to COM7, the common port that connects common cathode LED charactron is or/and 18 data lines of the negative electrode of light emitting diode are connected to the light on and off control port of control chip, promptly among the figure S1 of control chip to S18.
Except above-mentioned 7 * 18 project organization, in order to satisfy 124 display dot, can also be designed to i.e. 14 * 9 the project organization of 14 address wires and 9 data lines, perhaps i.e. 21 * 6 the project organization etc. of 21 address wires and 6 data lines.
Any circuit under the circuit logic structure of above-mentioned third and fourth two kinds of situations all has following common ground: be exactly when reading scan, rotation output high level by the scanning sequency control port, the level of each corresponding display dot light on and off control port is then according to wanting the content displayed decision, need light with regard to output low level, not light and just export high level or be arranged to high-impedance state.
At above-mentioned first, second, third and fourth kind situation, also have these points supplementary notes:
Except four kinds of above-mentioned situations, also there is another kind of circuit structure form, the part scanning sequency control port of control chip adopts low level to drive, and part scanning sequency control port adopts high level to drive in addition.For this class situation, then adopt above-mentioned first kind and the third situation engage, first kind and the 4th kind of situation engages, second kind and the third situation engages or second kind and the 4th kind of situation such as engage at the mode built-up circuit.Order by address wire when scanning shows scans.
Specific embodiments of the invention, except above-mentioned circuit structure, other structures can also be arranged, and are that 22 data line quantity are that 6 22 * 6 structures, number of address lines are that 6 data line quantity are that 22 6 * 22 structures, number of address lines are that 20 data line quantity are that 6 20 * 6 structures and number of address lines are that 6 data line quantity are 20 6 * 20 structures etc. as number of address lines.
No matter adopt which type of project organization, total principle is: maximum stroke quantity of Xian Shiing are determined the quantity of scanning sequency control port and display dot light on and off control port as required, also to consider to improve the utilization factor of IO mouth simultaneously, use the less control chip of IO mouth reducing cost, and consider to make things convenient for single face wiring board wiring etc.
Numeral shows and all to adopt the LED charactron among the embodiment under above-mentioned four kinds of situations, it comprise Nian Shiwei, a year position, a position, month ten, months, a position, day ten, days, ten of moon months, a moon month position, ten of lunar calendar days, a lunar calendar day position, Shi Shiwei, the time position, divide ten, individual of branch, an individual position, ten, seconds second, ten of temperature, temperature and week.Dodge second wherein, on schedule, pilot lamp such as locking then adopts light emitting diode to make.Dodging in described second is that two light emitting diodes are formed, and is that a light emitting diode is formed on schedule, and locking is that a light emitting diode is formed.
Among the embodiment under above-mentioned four kinds of situations 7 * 18 or 18 * 7 project organization is arranged all, if removing " second " shows, the project organization that 7 * 16 (7 address wire * 16 data line) or 16 * 7 (16 address wire * 7 data line) can also be arranged, change 7 of above-mentioned address wire or data line into 8, also have 8 * 18 (8 address wire * 18 data line), 18 * 8 (18 address wire * 8 data line), the structure of 8 * 16 (8 address wire * 16 data line) or 16 * 8 (16 address wire * 8 data line), the most tangible benefit of these structures is: except the moon 10-bit digit pipe of the Gregorian calendar and the lunar calendar, and indivedual display segments of part charactron are because need not, outside directly unsettled, the display segment control pin of the same name of charactron can not need wire jumper just can couple together very easily when the single face wiring board connects up, form 7 address wires or data line, and then be connected to 7 of control chip and drive ports, and except the Gregorian calendar and the lunar calendar the moon ten, the common port of all the other each charactrons, one that all only need be connected to control chip separately drives on the pin, not needing detours is connected to other element, also avoided wire jumper, (be the installation of chip on the single face wiring board according to control chip assembly technology in the circuit board again, be to install or mount at circuit surface from the component side straight cutting) suitably arrange control chip to drive putting in order of pin, make from control chip drive pin to the line of display circuit just along, do not need wire jumper.So arrange, when the single face wiring board connects up, can save wire jumper to greatest extent and even not use wire jumper, improved production efficient, reduced production cost, also improved reliability of products.
Difference with the prior art of the present invention is to have omitted " display driver circuit ", changes by control chip directly to drive display circuit.Owing to omitted display driver circuit, replaced control chip and directly drive demonstration.If the existing display driver circuit of just simple cancellation changes into by control chip and directly driving, and system is not redesigned, product brightness and uniformity coefficient all are difficult to reach designing requirement.
The present invention is directed to the problems referred to above, a whole set of rational display driver implementation method is provided, make the brightness of product and the designing requirement that uniformity coefficient reaches appointment when control chip directly drives display circuit.
The implementation method and the flow process of the digital perpetual calendar of described LED are as follows, and the quantity of the display dot of the digital perpetual calendar of described LED is D, and described implementation method specifically comprises:
Step S100: display dot is aligned in the display matrix that is made of n bar address wire and m bar data line, a pin of display dot is connected on the address wire, another pin is connected on the data line, wherein, in the display matrix of the digital perpetual calendar of described LED display dot add up to 30 to 260, n and m are natural number;
Step S200: select control chip, with drive current in the control chip greater than 0.3 * (c X1/ q X1+ c X2/ q X2+ ... + c Xm/ q Xm) * T 0/ T xThe I/O mouth as x scanning sequency control port of control chip, and be connected with x bar address wire in the display matrix, described control chip scans demonstration by the order that is connected to the address wire on the scanning sequency control port, wherein, c X1, c X2..., c XmRepresent on the x bar address wire be connected respectively to the 1st, 2 ..., the display dot on the m bar data line the parameter of electric current-brightness transition efficient; q X1, q X2..., q XmRepresent on the x bar address wire be connected respectively to the 1st, 2 ..., the display dot on the m bar data line is to showing time T xUtilization factor, T xBe meant the demonstration time of distributing to display dot on the x bar address wire, T 0Be meant that display matrix shows the cycle of a frame, x is any natural number in interval [1, n].
The digital perpetual calendar product of existing LED, its displaying contents generally comprise the date of the Gregorian calendar and the lunar calendar the moon day, solar term show and fate reciprocal of the next solar term of distance, Hour Minute Second, week, environment temperature or the like, these contents are shown by the display module that light emitting diode and charactron constitute.Minimum flat light emission that can independent displaying in the display module is called a display dot, and definition can be determined the quantity of display dot in the display module according to this.Display dot is made up of a light emitting diode or is made up of a plurality of light emitting diode series connection, parallel connection or string and series-parallel connection.
The total quantity D of the digital perpetual calendar display dot of LED is between 30 to 260, when adopting control chip directly to drive, for saving the I/O mouth resource of control chip, reduce chip cost, display dot is aligned in the display matrix of being made up of n bar address wire and m bar data line, constitute the display module of digital perpetual calendar, and make n * m 〉=D.A pin of display dot is connected on the address wire, and another pin is connected on the data line.
Number of address lines n and data line quantity m be in 2 ~ 87 scope in the above-mentioned display module, and the I/O mouth of control chip is no less than n+m.
N bar address wire in the display module has been divided into the n group with display dot, and when scanning showed, by the level (the demonstration level being provided promptly only for an address wire in the n bar address wire) of control address line, the content of selected one group of display dot was shown at every turn; Data line in the display module is responsible for the video data of determining according to displaying contents is flowed to through one group of selected display dot of address wire, thereby lights corresponding display dot.
The I/O mouth that is used for gated sweep order in the control chip is called the scanning sequency control port, and the I/O mouth that is used to control the display dot light on and off is called display dot light on and off control port.The method of attachment of control chip and display module: address wires all in the display module is connected directly to scanning sequency control port on the control chip one to one, data lines all in the display module is connected directly to display dot light on and off control port on the control chip one to one.
During demonstration, control chip is by the address wire of scanning sequency control port control display module, and under the cooperation of the video data that display dot light on and off control port is exported, make the n on the display module organize the content that display dot only shows one group of display dot at every turn, behind the time-delay certain hour, show the content of next group display dot again, the content of successively n being organized display dot in the same way all shows one time to be called a frame, shown that the needed time of a frame is called a frame period, used T 0Expression, the frame number that shows in the per second time is called frame frequency, when frame frequency more than 24 hertz, persist principle according to human eye vision, will see that the content intact of digital perpetual calendar shows.The frame frequency of the digital perpetual calendar of LED keeps greater than 24 hertz.
The light-emitting component that constitutes the display dot of display module is a light emitting diode, and in its running current scope, the luminosity of light emitting diode and the electric current that flows through roughly are directly proportional.The current conversion that flows through display dot becomes the efficient of brightness, represents with parameter c, and the definition of parameter c is: display dot reaches the i.e. parameter c of the electric current of display dot-brightness transition efficient for this reason of the needed current value of given luminance.From the definition of parameter c as can be known, reaching under the situation of same given luminance, the numerical value of the parameter c of display dot is big more, the current conversion that this display dot is flow through in expression becomes the efficient of brightness just low more, numerical value is more little, current conversion becomes the efficient of brightness just high more, therefore, parameter c has been represented a kind of attribute of display dot itself, its size is by the decision of the characteristic of display dot itself, influence number and connection in series-parallel situation that its big or small factor comprises the light emitting diode of forming display dot, electric energy is to the conversion efficiency of luminous energy, glow color, light emitting sheet area size, the encapsulation technology of display dot, technology, material or the like, these all are the characteristics that belongs to display dot itself.Specifically, the number of the light emitting diode series connection of composition display dot is many more, electric energy is high more to the conversion efficiency of luminous energy, color is concentrated more the closer to yellow green, light-emitting area, reach the brightness of appointment, and needed electric current is just more little, the value that is parameter c is just more little, otherwise the value of c is just big more.In addition, by the definition of parameter c as can be known, parameter c is one and the corresponding current value of given luminance from numerical value, the brightness that will reach of i.e. appointment changes, its current value also can change, and parameter c also can and then change, therefore, during the parameter c of more different display dot, must be under the condition of same brightness, to carry out.
In the design phase, need definite numerical values recited of the parameter c of selected display dot, according to the definition of parameter c, the brightness that must specify display dot to reach.In view of the product of design, its display dot need reach the predetermined brightness standard, stipulates the given luminance of this luminance standard when measuring the parameter c of display dot.Suppose that the luminance standard that the product needed of design reaches is " under ambient light illumination 800 luxs; the display dot of lighting can be known identification in 2 meters scopes of display surface normal direction ", can determine that then a kind of simple and effective approximation method determines the size of the numerical value of c: pass to direct current for a display dot that needs to determine its parameter c, and ascending increase current value, observe simultaneously under ambient light illumination 800 luxs, in the time of can just knowing the display dot that identification lights in 2 meters positions of display surface normal direction, the current value that flows through this display dot is numerically equal to the parameter c of the electric current of this display dot-brightness transition efficient.
Pay particular attention to such an extent that be: " ambient light illumination value " described in the method for above-mentioned definite display dot parameter c is not limited to " 800 lux ", can require to change to the difference of product brightness with the user, the parameter c of the display dot that correspondingly, measures also can change.And the difference of the numerical value of the display dot parameter c that causes of the difference of " ambient light illumination value ", can not influence that the present invention mentions yet for improving the principle that product brightness and uniformity coefficient adopted and the application and the enforcement of method.
The parameter c of the display dot of related herein seven section 8 font charactron of 0.5～0.8 inch redness is measured down in " 800 lux " " ambient light illumination value " with above-mentioned this method.Chang Yong seven section 8 font charactron of 0.5～0.8 inch redness in the market, if each display segment is called a display dot, its display dot c value approximately is 0.25mA～0.6mA, quality its c value preferably can be littler.
Measure the value of the parameter c of arbitrary display dot on the existing digital perpetual calendar product, definition according to parameter c, the given luminance that display dot reaches when needing specified measurement, therefore, given luminance when the brightness of display dot was for measurement display dot parameter c when special regulation had perpetual calendar product operate as normal now, the measuring method that obtains thus is: add normal working power to existing product, it can operate as normal also be shown, and select out display dot tested on the product.Other gets and the identical light-emitting component of tested display dot, it is placed near the tested display dot with under the identical photoenvironment of tested display dot, add direct supply to it, and adjust electric current from small to large, observe the brightness of this display dot simultaneously, when reaching the brightness identical with tested display dot, the current value that flows through this display dot is numerically equal to the parameter c of the electric current of tested display dot-brightness transition efficient.
According to above as can be known for the definition of parameter c, pass to the identical electric current of parameter c that size equals its electric current-brightness transition efficient for some display dot, this display dot can reach the brightness (brightness when promptly measuring the numerical value of its parameter c) of appointment.But for the display module that adopts the scanning display mode, not continual and steady electric current, but scan the pulse current when showing, reach identical display brightness, bigger pulse current need be provided owing to light the electric current of display dot.
Size for the drive current that needs on address wire and the data line in the display module that determine to adopt the scanning display mode, be that example is illustrated with display module below with n bar address wire and m bar data line, corresponding, its control chip scanning sequency control port quantity is n, and the quantity of display dot light on and off control port is m.
At a display frame period T 0In, suppose that the demonstration time of distributing to the display dot on each bar address wire (also being each scanning sequency control port of control chip simultaneously) is respectively T 1, T 2... T n, distribute in the display module that the demonstration time of display dot is meant at a display frame period T on the address wire 0In have and show that electric current flows through the time of this address wire.T pBe display frame period T 0In be not used in time of demonstration.Relation between above-mentioned each time quantum is: T 1+ T 2+ ... + T n+ T p=T 0
If (the x scope is that the demonstration time of display dot on 1 ~ n) address wire is T to distribute to x bar in the display module x, and establish and be connected to the y bar on this address wire simultaneously (the y scope is the display dot D of 1 ~ m) data line XyTo showing time T xUtilization factor be q Xy, this display dot D then XyThe time that is used for showing is q Xy* T x, light this display dot D XyTime only account for (the q of a frame time Xy* T x)/T 0,, lighting the time q of this display dot for the brightness that visually reaches appointment (brightness of correspondence when promptly determining the parameter c of this display dot) Xy* T xIn, its brightness must reach the T of given luminance 0/ (q Xy* T x) doubly, therefore, the pulse current that flows through this display dot must be not less than c Xy* T 0/ (q Xy* T x), c XyThe parameter of the electric current of display dot-brightness transition efficient for this reason.For all display dot on the y bar data line that guarantees display module can both reach given luminance (brightness of correspondence when promptly determining the parameter c of display dot), the driving force that drives the chip light on and off control port of this y bar data line must satisfy each display dot D on the y bar data line on the display module 1y, D 2y..., D NyRequired drive current c 1y* T 0/ (q 1y* T 1), c 2y* T 0/ (q 2y* T 2) ..., c Ny* T 0/ (q Ny* T n) in the maximum.Therefore, when selecting control chip, will possess drive current greater than c 1y* T 0/ (q 1y* T 1), c 2y* T 0/ (q 2y* T 2) ..., c Ny* T 0/ (q Ny* T n) in the I/O mouth of the maximum as y bar light on and off control port, be used for driving the y bar data line of display module.Wherein: c 1y, c 2y..., c NyFor on the y bar data line in the display module be connected respectively to the 1st, 2 ..., n bar address wire the electric current-brightness transition efficiency parameters c of display dot; T 1, T 2..., T nFor distribute to the 1st, 2 ..., the display dot on the n bar address wire the demonstration time; q 1y, q 2y..., q NyBe on the y bar data line be connected respectively to the 1st, 2 ..., the display dot on the n bar address wire is to distributing to their demonstration time T 1, T 2... T nUtilization factor, T 0Be display frame period.Can obtain the driving current value that other data line needs on the display module by above-mentioned same method.
By driving display dot D XyThe formula " c of electric current Xy* T 0/ (q Xy* T x) " as can be known, the time that display dot is lighted accounts for frame period T 0The i.e. (q of ratio Xy* T x)/T 0More little, the c of display dot XyBig more (being that display dot electric current-brightness transition efficient is low more), the drive current that reach given luminance is also big more, and the drive current that requires control chip light on and off control port to provide is also big more; Otherwise the time that display dot is lighted accounts for frame period T 0Ratio (q Xy* T x)/T 0Big more, the c of display dot XyMore little (being that display dot electric current-brightness transition efficient is high more), the drive current that reach given luminance is also more little, and the drive current that requires control chip light on and off control port to provide is also more little.
The electric current that flows through the display module addresses line equals the electric current sum of all display dot lighted simultaneously on this address wire.When all display dot on the address wire were lighted simultaneously and reach given luminance (brightness of correspondence when promptly determining the parameter c of display dot), the drive current that needs on this address wire was calculated as follows: according to display dot D XyCurrent formula " c Xy* T 0/ (q Xy* T x) ", on the x bar address wire all display dot light simultaneously and when reaching given luminance the electric current sum of each display dot be and drive the required electric current of x bar address wire: c X1* T 0/ (q X1* T x)+c X2* T 0/ (q X2* T x)+... + c Xm* T 0/ (q Xm* T x)=(c X1/ q X1+ c X2/ q X2+ ... + c Xm/ q Xm) * T 0/ T xWherein, T 0Be display frame period, T xFor being assigned to the demonstration time of the display dot on the x bar address wire, c X1, c X2..., c XmBe on the x bar address wire be connected respectively to the 1st, 2 ..., the display dot on the m bar data line the parameter of electric current-brightness transition efficient, q X1, q X2..., q XmBe on the x bar address wire be connected respectively to the 1st, 2 ..., the display dot on the m bar data line is to showing time T xUtilization factor.Consider digital perpetual calendar product when operate as normal, all display dot on the address wire generally speaking not can with the time light, the display dot of lighting simultaneously at most are greatly about more than 30%, the actual current on the address wire does not reach according to formula (c yet X1/ q X1+ c X2/ q X2+ ... + c Xm/ q Xm) * T 0/ T xThe numerical value that calculates, therefore, when selecting control chip, with drive current in the control chip greater than 0.3 * (c X1/ q X1+ c X2/ q X2+ ... + c Xm/ q Xm) * T 0/ T xThe I/O mouth as x scanning sequency control port, be used for driving the x bar address wire of display module.Can obtain the driving current value that other address wire needs on the display module by above-mentioned same method, and select according to this on the control chip to be used for driving corresponding address line in the display module greater than the I/O mouth of this drive current scanning sequency control port as correspondence.
For the ease of understanding above-mentioned content, now lift an instantiation and be illustrated:
See shown in the accompanying drawing 6, the displaying contents of the digital perpetual calendar of this LED comprises date, Hour Minute Second, moon month day, week, temperature, each one of pilot lamp and locking pilot lamp on schedule, dodge two of pilot lamp (blank character ": " between instant the branch, between second branch) second, 24 hours standards or 12 hours standards are optional among the figure, following example adopts 12 hours systems, represents with pilot lamp in the morning and afternoon.Wherein digital content except that the time-division charactron with 0.8 inch, all the other show the single diode displaying of pilot lamp with 7 section 8 font charactron of 0.5 inch redness.
Display module among Fig. 6 adopts the matrix structure of 7 address wires and 18 data lines, and address wire is COM1 ~ COM7, and data line is S1 ~ S18.Be example with data line S7 and address wire COM3 below, calculating the chip I/O that is used for driving S7 and COM3 needs great at least driving force:
At first, determine the parameter c of the electric current-brightness transition efficient of each display dot.Suppose that the brightness that product design requires to reach is " under ambient light illumination 800 luxs; the display dot of lighting can be known identification in 2 meters scopes of display surface normal direction ", this brightness is " given luminance ", brightness requirement is measured selected 0.5 inch and 0.8 cun charactron and the single light emitting diode that is used as pilot lamp according to this, the c value of supposing 0.5 cun each display segment of charactron that measures is 0.3 milliampere, 0.8 the c value of very little each display segment of charactron is 0.5 milliampere, the morning and afternoon pilot lamp the c value be 0.2 milliampere.
Secondly, the requirement of comprehensive total system each side, the demonstration time T 1 ~ T7 that determines the display frame period T0 of display module and distribute to each bar address wire.Suppose the T0=10 millisecond, the T1=T2=T5=1.1 millisecond, the T3=1.2 millisecond, the T4=T6=T7=1.3 millisecond, the time that is not used for showing in the frame period is the T0-T1-T2-T3-T4-T5-T6-T7=1.6 millisecond.Suppose 0.5 cun on the charactron display dot, the display dot on 0.8 cun charactron and the morning and afternoon pilot lamp the utilization factor of the demonstration time of the address wire that is assigned to their place is respectively 60%, 100%, 40%, 40%.
Calculate the required electric current of driving data lines S7.5 display dot are arranged on the S7, be respectively the morning and afternoon pilot lamp (morning, pilot lamp was on the 2nd address wire and the 7th data line, therefore was labeled as D 27, same indicating light sign in afternoon is designated as D 37, as follows), and three display dot on hour 10-bit digit pipe (b, c, three display segments of g are designated as D respectively 47, D 77, D 17).D 17, D 27, D 37, D 47, D 77Reach the required drive current of given luminance and be respectively c 17* T 0/ (q 17* T 1), c 27* T 0/ (q 27* T 2), c 37* T 0/ (q 37* T 3), c 47* T 0/ (q 47* T 4), c 77* T 0/ (q 77* T 7).C wherein 17, c 27, c 37, c 47, c 77Be respectively 0.5 milliampere, 0.2 milliampere, 0.2 milliampere, 0.5 milliampere, 0.5 milliampere, q 17, q 27, q 37, q 47, q 77Be respectively 100%, 40%, 40%, 100%, 100%, T0=10 millisecond, T1=T2=1.1 millisecond, T3=1.2 millisecond, T4=T7=1.3 millisecond.With these data substitution formula, can calculate D 17, D 27, D 37, D 47, D 77Reach the required drive current of given luminance and be respectively 4.55 milliamperes, 4.55 milliamperes, 4.17 milliamperes, 3.85 milliamperes, 3.85 milliamperes, wherein the maximum is 4.55 milliamperes, therefore, when selecting control chip, adopt driving force greater than 4.55 milliamperes I/O mouth driving data lines S7.
Calculate and drive the required electric current of address wire COM3.Have 18 display dot, wherein D on the COM3 37Be the pilot lamp in afternoon, the c value is 0.2 milliampere, is 40% to the utilization factor of time T 3, D 34, D 35, D 36Belong to 0.8 cun display dot on the charactron, its c value is 0.5 milliampere, to the utilization factor of time T 3 be 100%, the c value of all the other 14 display dot is 0.3 milliampere, is 60% to the utilization factor of time T 3.These data are brought into the formula 0.3 * (c of the drive current that calculates COM3 31/ q 31+ c 32/ q 32+ c 33/ q 33+ c 34/ q 34+ c 35/ q 35+ c 36/ q 36+ c 37/ q 37+ c 38/ q 38+ c 39/ q 39+ c 310/ q 310+ c 311/ q 311+ c 312/ q 312+ c 313/ q 313+ c 314/ q 314+ c 315/ q 315+ c 316/ q 316+ c 317/ q 317+ c 318/ q 318) * T 0/ T 3, the drive current that calculates COM3 is 22.5 milliamperes.Therefore, when selecting control chip, adopt driving force to drive address wire COM3 greater than 22.5 milliamperes I/O mouth.
By formula (c X1/ q X1+ c X2/ q X2+ ... + c Xm/ q Xm) * T 0/ T xAs can be known: the demonstration time T of distributing to display dot on the x bar address wire xAccount for frame period T 0Ratio T x/ T 0More little, each display dot is to distributing to the demonstration time T of display dot on the address line xUtilization factor q X1, q X2..., q XmLow more, reach given luminance (brightness of correspondence when promptly determining the parameter c of display dot), the drive current that needs is just big more, otherwise, distribute to the demonstration time T of display dot on the x bar address wire xAccount for frame period T 0Ratio T x/ T 0Big more, each display dot is to distributing to the demonstration time T of display dot on the address line xUtilization factor q X1, q X2..., q XmHigh more, reach given luminance, the drive current that needs is just more little.
By formula (c X1/ q X1+ c X2/ q X2+ ... + c Xm/ q Xm) * T 0/ T xAs can be known, when the driving force of each light on and off control port of control chip is identical, and the parameter of each the display dot electric current-brightness transition efficient on same address wire is when inequality, can be by adjusting q X1, q X2..., q XmValue, make c X1/ q X1=c X2/ q X2=...=c Xm/ q XmThereby, make that each the display dot brightness on same the address wire is even.
Existing control chip on the market, same I/O mouth is (being that high level drives and low level drives) under different driving logic levels, its driving force generally is different, driving force when most of chip is output " low " level is strong, and the driving force when exporting " height " level relatively a little less than, it is that the driving force of output during " height " level is strong that some chips are also arranged, and the driving force when exporting " low " level relatively a little less than.Therefore, do not reach 0.3 * (c as the I/O mouth drive current of scanning sequency control port when control chip X1/ q X1+ c X2/ q X2+ ... + c Xm/ q Xm) * T 0/ T xThe time, need to adopt the stronger driving logic level of this I/O mouth driving force to drive.
Drive current is greater than 0.3 * (c on control chip X1/ q X1+ c X2/ q X2+ ... + c Xm/ q Xm) * T 0/ T xThe quantity of I/O mouth when being less than the quantity of required scanning sequency control port, adopt on the control chip that at least two I/O mouths are in parallel to form a drive current greater than 0.3 * (c X1/ q X1+ c X2/ q X2+ ... + c Xm/ q Xm) * T 0/ T xPort use as x scanning sequency control port, be used for driving the x bar address wire of display module.
Drive current is greater than c on control chip 1y* T 0/ (q 1y* T 1), c 2y* T 0/ (q 2y* T 2) ..., c Ny* T 0/ (q Ny* T n) in the quantity of I/O mouth of the maximum when being less than the quantity of required display dot light on and off control port, adopt on the control chip that at least two I/O mouths are in parallel to form a drive current greater than c 1y* T 0/ (q 1y* T 1), c 2y* T 0/ (q 2y* T 2) ..., c Ny* T 0/ (q Ny* T n) in the port of the maximum use as y display dot light on and off control port, be used for driving the y bar address wire of display module.
When the driving force of control chip can't guarantee that display dot reaches given luminance, also can adopt following method to solve respectively:
In control chip operate as normal parameter area, promote control chip voltage, to increase drive current.
The number of the light emitting diode of connecting in the display dot is increased, and in control chip operate as normal parameter area, promote control chip voltage, do not increase brightness thereby do not increase under the situation of electric current.
Under the prerequisite that control chip I/O mouth quantity allows, the quantity that as far as possible reduces the scanning sequency control port (does not reduce for guaranteeing that total demonstration is counted, need increase the quantity of light on and off control port simultaneously), to reduce the number of times that switches between the frame interscan sequential control port, saved switching time, total demonstration time accounts for the corresponding raising of ratio meeting of a frame time, thereby has improved brightness.And do the drive current that can't increase on the address wire like this.
Select for use the high light emitting diode of luminescence efficiency to form display dot, under the situation that does not increase drive current, can also select for use the light emitting diode of glow color to improve brightness with higher brightness effect, for example, under the same light power condition, the light of yellow, yellowish green color is just than the brightness height of red color.
Part except that display dot on the display panel is made black or dark background, be used for absorbing spurious rays, improve visibility by improving contrast.
Improve the encapsulation of chip, the radiating condition that provides makes chip can sustain bigger power consumption, thereby makes chip that bigger drive current is provided.
The situation of brightness irregularities also can appear in the digital perpetual calendar of LED when showing, promptly have the brightness of part display dot bright partially or dark partially, and adopt following method to handle this moment:
1. when the brightness irregularities of display dot, on the address wire of bright excessively display dot and/or data line, add current-limiting resistance.
2. adopt the not scanning display mode of Fixed Time Interval.
Prior art generally adopts the mode at interval equal time to scan demonstration, and the demonstration time of promptly distributing to each scanning sequency control port is all identical.
Present technique adopts control chip directly to drive display unit, because the driving force of control chip I/O mouth is always limited, when the display dot of lighting simultaneously on the scanning sequency control port is many, the electric current that flows through each display dot will be less relatively, and when the display dot of lighting simultaneously on the scanning sequency control port was fewer, the electric current that flows through each display dot will be relatively large.If still take the mode at existing equal time of interval to scan demonstration, under the identical or approaching situation of the electric current luminance efficiency c of each display dot, the demonstration of lighting simultaneously on the scanning sequency control port is counted will be brighter relatively when less, and the demonstration of lighting simultaneously on the scanning sequency control port count will be darker relatively when more, cause the brightness irregularities of product.
Wherein, adopting not, the scanning display mode of Fixed Time Interval is: first method is: in same display frame period, when the demonstration that will light on the address wire A of display module is counted and is counted greater than the demonstration that will light on another address wire B, then being assigned to the demonstration time that address wire A goes up display dot goes up the demonstration time of display dot greater than being assigned to address wire B, and the frame frequency that scanning is shown keeps greater than 24 hertz.Wherein, the arbitrary address wire on A and the B general reference display module.The demonstration time of distributing to display dot on the address wire is meant at a display frame period T 0In have and show that electric current flows through the time of this address wire.
Second method is: when the parameter of the electric current-brightness transition efficient of the display dot E on same address wire on the display module during greater than the parameter of electric current-brightness transition efficient of display dot F, control by display dot light on and off control port, on being assigned to this address wire, in the demonstration time of display dot, make the time of lighting the lighting the time of display dot E greater than display dot F.This method promptly can be used on the scanning sequency control port and shows under the identical situation of time; Also can be used on the scanning sequency control port and show time situation inequality.Wherein, the arbitrary display dot on same address wire of display dot E and display dot F general reference.
Above-mentioned first method and second method also can be used simultaneously.
The present invention also provides another special case, promptly when the c of each display dot value is identical or close, making each display dot all is 100% to the utilization factor of the demonstration time of address line, make the set-up mode of the demonstration time of address wire be simultaneously: counting when the demonstration of lighting simultaneously on the scanning sequency control port accounts for ratio that the total demonstration that will light when former frame counts when relatively large, the ratio that the demonstration time of distributing to this port accounts for this frame T.T. is just many relatively, otherwise, the demonstration of lighting simultaneously on a scanning sequency control port is counted and is accounted for ratio that the total demonstration that will light when former frame counts relatively hour, and it is just few relatively that the demonstration time of distributing to this port accounts for the ratio of this frame T.T..Guarantee that simultaneously the frame frequency that scanning shows keeps greater than 24 hertz.
The benefit of doing like this is: show the uniformity coefficient except significantly improving, because the time of lighting less display dot is moved to lighting time of more display dot, because display dot is many, total current is big, time has also prolonged, so just increased the average current that scanning shows, be equivalent to increase the input electric power of display module, the luminosity of display module will inevitably obviously improve.
Adopt the present invention can make the digital perpetual calendar of LED under the situation that does not increase display driver circuit, also can reach needed display brightness, and make the brightness of each display dot even.The present invention has simplified the circuit design of the digital perpetual calendar of LED and the producing process of wiring board, has reduced production cost, has improved reliability of products.For example, adopt circuit structure provided by the invention to carry out circuit layout and just can be implemented in the single face wiring board few use and even do not use wire jumper, saved material cost, improved production efficiency and product reliability.
Should be understood that application of the present invention is not limited to above-mentioned giving an example, for those of ordinary skills, can be improved according to the above description or conversion that all these improvement and conversion all should belong to the protection domain of claims of the present invention.

Claims (13)

1. the digital perpetual calendar implementation method of LED that is directly driven by control chip is characterized in that, may further comprise the steps:
Display dot is aligned in the display matrix that is made of n bar address wire and m bar data line, a pin of display dot is connected on the address wire, and another pin is connected on the data line, wherein, in the display matrix of the digital perpetual calendar of described LED display dot add up to 30 to 260, n and m are natural number;
Select control chip, with drive current in the control chip greater than 0.3 * (c X1/ q X1+ c X2/ q X2+ ... + c Xm/ q Xm) * T 0/ T xThe I/O mouth as x scanning sequency control port of control chip, and be connected with x bar address wire in the display matrix, described control chip scans demonstration by the order that is connected to the address wire on the scanning sequency control port, wherein, c X1, c X2..., c XmRepresent on the x bar address wire be connected respectively to the 1st, 2 ..., the display dot on the m bar data line the parameter of electric current-brightness transition efficient; q X1, q X2..., q XmRepresent on the x bar address wire be connected respectively to the 1st, 2 ..., the display dot on the m bar data line is to showing time T xUtilization factor, T xBe meant the demonstration time of distributing to display dot on the x bar address wire, T 0Be meant that display matrix shows the cycle of a frame, x is any natural number in interval [1, n].
2. the digital perpetual calendar implementation method of LED that directly drives by control chip according to claim 1, it is characterized in that, in same display frame period, when the demonstration that will light on the address wire A of display module is counted and is counted greater than the demonstration that will light on another address wire B, then being assigned to the demonstration time that address wire A goes up display dot goes up the demonstration time of display dot greater than being assigned to address wire B, and the frame frequency that scanning is shown keeps greater than 24 hertz.
3. the digital perpetual calendar implementation method of LED that directly drives by control chip according to claim 1 and 2, it is characterized in that, when the parameter of the electric current-brightness transition efficient of the display dot E on same address wire on the display module during greater than the parameter of electric current-brightness transition efficient of display dot F, on being assigned to this address wire, in the demonstration time of display dot, make the time of lighting the lighting the time of display dot E greater than display dot F.
4. the digital perpetual calendar implementation method of LED that is directly driven by control chip according to claim 1 is characterized in that drive current is greater than 0.3 * (c on control chip X1/ q X1+ c X2/ q X2+ ... + c Xb/ q Xb) * T 0/ T xThe quantity of I/O mouth when being less than the quantity of required scanning sequency control port, adopt on the control chip that at least two I/O mouths are in parallel to form a drive current greater than 0.3 * (c X1/ q X1+ c X2/ q X2+ ... + c Xb/ q Xb) * T 0/ T xPort use as a scanning sequency control port.
5. the digital perpetual calendar implementation method of LED that is directly driven by control chip according to claim 1 is characterized in that described control chip adopts the strong high or low drive level of the driving force in its drive level that the scanning sequency control port is driven.
6. the digital perpetual calendar implementation method of LED that is directly driven by control chip according to claim 1 is characterized in that a plurality of light emitting diodes of series connection in the display dot.
7. the digital perpetual calendar implementation method of the LED that is directly driven by control chip according to claim 1 is characterized in that, when the brightness irregularities of display dot, adds current-limiting resistance on the address wire at bright excessively display dot place and data line.
8. digital perpetual calendar of the LED that directly drives by control chip, it is characterized in that, comprise control chip, control chip circuit system, power circuit and display module, described control chip circuit system and display module are connected to control chip, described power circuit connects control chip, control chip circuit system respectively
Wherein, described display module is a display matrix, and display dot is aligned in the display matrix that is made of n bar address wire and m bar data line, a pin of display dot is connected on the address wire, another pin is connected on the data line, the display dot in the described display module add up to 30 to 260
The I/O mouth that is used for the gated sweep order in the described control chip is the scanning sequency control port, the I/O mouth that is used for display dot light on and off control is display dot light on and off control ports, the address wire of described display module is connected directly to the scanning sequency control port one to one, and the data line of described display module is connected directly to display dot light on and off control port one to one.
9. the digital perpetual calendar of LED that is directly driven by control chip according to claim 8 is characterized in that drive current is greater than 0.3 * (c in the control chip X1/ q X1+ c X2/ q X2+ ... + c Xm/ q Xm) * T 0/ T xThe I/O mouth as x scanning sequency control port of control chip, be connected with x bar address wire in the display matrix, wherein, c X1, c X2..., c XmRepresent on the x bar address wire be connected respectively to the 1st, 2 ..., the display dot on the m bar data line the parameter of electric current-brightness transition efficient; q X1, q X2..., q XmRepresent on the x bar address wire be connected respectively to the 1st, 2 ..., the display dot on the m bar data line is to showing time T xUtilization factor, T xBe meant the demonstration time of distributing to display dot on the x bar address wire, T 0Be meant that display matrix shows the cycle of a frame, x is any natural number in interval [1, n], and n is the quantity of the address wire that is connected to control chip scanning sequency control port on the display module.
10. the digital perpetual calendar of LED that is directly driven by control chip according to claim 8 is characterized in that the display dot in the described display module is made up of a plurality of light emitting diodes.
11. the digital perpetual calendar of the LED that is directly driven by control chip according to claim 8 is characterized in that, the driving force according to the high/low level of control chip is provided with the strong high/low level of driving force and drives described scanning sequency control port.
12. the digital perpetual calendar of LED that is directly driven by control chip according to claim 8 is characterized in that per 7 display dot in the described display module in same address wire or the same data line are formed seven section 8 font charactron of a LED.
13. the digital perpetual calendar of LED that directly drives by control chip according to claim 8, it is characterized in that the display matrix of the digital perpetual calendar of described LED is set to the structure of 7 address wire * 16 data lines, 16 address wire * 7 data lines, 7 address wire * 18 data lines, 18 address wire * 7 data lines, 8 address wire * 16 data lines, 16 address wire * 8 data lines, 8 address wire * 18 data lines or 18 address wire * 8 data lines.
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CN102184708A (en) * 2011-05-11 2011-09-14 冠捷显示科技（厦门）有限公司 Novel passive matrix driving device for local backlight regulation
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CN106839350B (en) * 2017-01-04 2020-08-25 青岛海尔空调器有限总公司 Air conditioner and display control method thereof
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CN112796075A (en) * 2020-12-30 2021-05-14 珠海格力电器股份有限公司 Power failure processing method and device
CN112796075B (en) * 2020-12-30 2021-12-14 珠海格力电器股份有限公司 Power failure processing method and device

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