CN209691366U - LED display driver IC - Google Patents
LED display driver IC Download PDFInfo
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- CN209691366U CN209691366U CN201920741572.3U CN201920741572U CN209691366U CN 209691366 U CN209691366 U CN 209691366U CN 201920741572 U CN201920741572 U CN 201920741572U CN 209691366 U CN209691366 U CN 209691366U
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Abstract
LED display driver IC provided by the utility model, including controller, row scan drive cell, LED array and column output driving unit；Wherein the output end of controller connects the input terminal of row scan drive cell, LED array described in the output end of row scan drive cell；Column output driving unit includes shift register, latch, constant current output unit and latches decoding unit；The data-out port and clock port of controller are additionally coupled to latch the input terminal of decoding unit, and the output end for latching decoding unit is connected to the control terminal of the latch.The chip is changed to the control of 3 line LED displays by the control of existing 4 line LED display, eliminates the data latch port LA of controller.Latch decoding unit is increased inside column output driving unit, by data-out port signal and clock port signal restoring LA data latch signal, existing LED display driver IC structure is simplified, reduces external-connected port.
Description
Technical field
The utility model belongs to technical field of integrated circuits, and in particular to a kind of LED display driver IC.
Background technique
In general, LED display screen system has controller, row turntable driving, LED light array and column output driving group
At.As shown in Figure 1, controller control row turntable driving and column output driving, row turntable driving control LED array is swept line by line
It retouches, the constant current that column output driving controls LED array, which is opened, realizes lighting line by line, and is realized by the PWM drive control of column output
The gray-scale Control of lamp.LED gray-scale Control line by line realizes the aobvious of image through space turntable driving periodicity row scanning display
Show.
4 line LED display driver ICs being widely used at present are more mature, i.e., lead between controller and column output driving
Frequently with 4 line traffic control modes.Respectively serial mode inputs SDI, data shift clock CLK, and data latch LA, and output, which is opened, to be made
It can OE.Wherein serial mode input SDI and data shift clock CLK is connected to the shift register module of column output driving.Data
It latches LA and is connected to latch module, be responsible for latch data.Shift register provides data to latch.Output is opened enabled OE and is connect
To constant current output module, it is responsible for whole enabled constant current output.Latch data control constant current output being opened and managing.It is shifted in data
The rising edge of clock CLK moves into serial input data SDI, and data latch the high level latch data of LA, and the data of latch are used
Control is opened and closed in output, it is the pwm signal that controller issues that enabled OE is opened in output, real for enabling constant current output
The gray-scale Control of existing LED.
But there is still a need for 4 ports to drive for existing 4 line LED display driver IC, and it is too many to occupy port resource.
Utility model content
Therefore, the purpose of the utility model is to provide a kind of LED display driver ICs, and it is aobvious to simplify existing 4 line LED
Display screen driving chip structure, reduces external-connected port.
A kind of LED display driver IC, including controller, row scan drive cell, LED array and column output driving list
Member；Wherein the output end of the controller connects the input terminal of the row scan drive cell, the output of row scan drive cell
End connects the LED array；
The column output driving unit includes shift register, latch and constant current output unit；The data of controller are defeated
Exit port and clock port are connected to the shift register, and the output end of shift register is connected to the input of the latch
End, the output end of latch are connected to the input terminal of constant current output unit, and the output end of constant current output unit is connected to the LED
Array；The enable port of controller is connected to the control terminal of constant current output unit；
The column output driving unit further includes latching decoding unit；The data-out port and clock port of controller are also
It is connected to the input terminal for latching decoding unit, the output end for latching decoding unit is connected to the control terminal of the latch.
Preferably, the constant current output unit in the column output driving unit is multiple；
The data latch port of controller is additionally coupled to the control terminal of another constant current output unit in column output driving unit,
The output end of the constant current output unit is connected to the LED array.
Preferably, the latch decoding unit includes multiple first d type flip flops, delay unit, reverser, combinational logic list
Member and the second d type flip flop；
All first d type flip flops are serially connected, wherein the power supply of the 1st the first d type flip flop terminates positive supply, N+1 is a
The output end of power supply termination the first d type flip flop of n-th of first d type flip flop；The output of all first d type flip flops is connected to combination
The input terminal of logic unit；The data segment of all first d type flip flops is connected to the data-out port of the controller；
The clock port of the controller is connected to the clock end of all first d type flip flops by the delay unit；Control
The clock port of device also passes through the data terminal that the reverser connects the second d type flip flop；
The power end of output the second d type flip flop of termination of the combinatorial logic unit, the output of the second d type flip flop terminate institute
State the control terminal of latch, the power supply terminated clock of the second d type flip flop.
LED display driver IC provided by the utility model is changed to 3 line LED by the control of existing 4 line LED display
Display screen control, eliminates the data latch port LA of controller.Latch decoding unit is increased inside column output driving unit,
By data-out port signal and clock port signal restoring LA data latch signal, existing 4 line LED display is simplified
Driving chip structure, reduces external-connected port.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In attached drawing, each element or part
It might not be drawn according to actual ratio.
Fig. 1 is the structural block diagram of existing 4 line LED display driver IC.
Fig. 2 is the structural block diagram for the LED display driver IC that the utility model embodiment one provides.
Fig. 3 is the circuit diagram for the latch decoding unit that the utility model embodiment two provides.
Specific embodiment
It is described in detail below in conjunction with embodiment of the attached drawing to technical solutions of the utility model.Following embodiment is only
For clearly illustrating the technical solution of the utility model, therefore it is only used as example, and it is originally practical to cannot be used as a limitation limitation
Novel protection scope.
It should be appreciated that ought use in this specification and in the appended claims, term " includes " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but one or more of the other feature, whole is not precluded
Body, step, operation, the presence or addition of element, component and/or its set.
It is also understood that in this utility model term used in the description merely for the sake of description specific embodiment
Purpose and be not intended to limit the utility model.As used in the utility model specification and appended book
Like that, other situations unless the context is clearly specified, otherwise " one " of singular, "one" and "the" are intended to include plural number
Form.
As used in this specification and in the appended claims, term " if " can be according to context quilt
Be construed to " when ... " or " once " or " in response to determination " or " in response to detecting ".Similarly, phrase " if it is determined that " or
" if detecting [described condition or event] " can be interpreted to mean according to context " once it is determined that " or " in response to true
It is fixed " or " once detecting [described condition or event] " or " in response to detecting [described condition or event] ".
Embodiment one:
A kind of LED display driver IC, referring to fig. 2, including controller, row scan drive cell, LED array and column are defeated
Driving unit out；Wherein the output end of the controller connects the input terminal of the row scan drive cell, row turntable driving list
The output end of member connects the LED array；
The column output driving unit includes shift register, latch and constant current output unit；The data of controller are defeated
Exit port (the hereinafter referred to as port SDI) and clock port (the hereinafter referred to as port CLK) are connected to the shift register, and displacement is posted
The output end of storage is connected to the input terminal of the latch, and the output end of latch is connected to the input of constant current output unit
End, the output end of constant current output unit are connected to the LED array；The enable port of controller is connected to constant current output unit
Control terminal；
The column output driving unit further includes latching decoding unit；The data-out port and clock port of controller are also
It is connected to the input terminal for latching decoding unit, the output end for latching decoding unit is connected to the control terminal of the latch.
Specifically, original LED display driver IC is needed to provide 4 terminals by controller and be controlled, this implementation
The LED display driver IC that example provides only needs controller 3 terminals of offer to be controlled.Column output driving unit saves
Data latch port (the hereinafter referred to as port LA) is gone to.Latch decoding unit is increased inside column output driving unit simultaneously.SDI
Port and the port CLK are also coupled to latch decoder module while being connected to shift register module, then latch the defeated of decoding unit
It is connected to latch out, is used for latch data.
Common data are latched in after serial data displacement completes, and data are latched to be shifted respectively when different with data
Between realize in section.Using the mode between CLK signal high period, sending multiple traditional latch signals of SDI pulses replacement, do not account for
Use channel width.While making full use of channel, the adjustment of signal is sent with hop controller, data latch function is integrated into
Chip interior, to save external data latch port.
The chip is changed to the control of 3 line LED displays by the control of existing 4 line LED display, eliminates the end LA of controller
Mouthful.Latch decoding unit is increased inside column output driving unit, it is multiple by data-out port signal and clock port signal
Former traditional LA latch signal, simplifies existing 4 line LED display driver IC structure, reduces external-connected port.
Preferably, the constant current output unit in the column output driving unit is multiple；
The data latch port of controller is additionally coupled to the control terminal of another constant current output unit in column output driving unit,
The output end of the constant current output unit is connected to the LED array.
Specifically, since column output driving unit can save the port LA, i.e. a pin less, facilitating chip port.
And the port LA saved can be used for increasing constant current output port.A constant current can be increased in the column output driving unit
The port LA of controller is connect the control terminal of the constant current output unit, the output end connection of the constant current output unit by output unit
To the LED array, such column output driving unit can control the bigger a piece of LED array of more LED light or control, from
And extended chip function.
Embodiment two:
Embodiment two increases the following contents on the basis of example 1:
Referring to Fig. 3, the first d type flip flop and the second d type flip flop indicate that delay unit is indicated with delay with dff in figure,
Reverser indicates that combinatorial logic unit is indicated with comb logic with inv.
The latch decoding unit include multiple first d type flip flops, delay unit, reverser, combinatorial logic unit and
Second d type flip flop；
All first d type flip flops are serially connected, wherein the power supply of the 1st the first d type flip flop terminates positive supply, N+1 is a
The output end of power supply termination the first d type flip flop of n-th of first d type flip flop；The output of all first d type flip flops is connected to combination
The input terminal of logic unit；The data segment of all first d type flip flops is connected to the data-out port of the controller；
The clock port of the controller is connected to the clock end of all first d type flip flops by the delay unit；Control
The clock port of device also passes through the data terminal that the reverser connects the second d type flip flop；
The power end of output the second d type flip flop of termination of the combinatorial logic unit, the output of the second d type flip flop terminate institute
State the control terminal of latch, the power supply terminated clock of the second d type flip flop.
Specifically, the pulse number that the number of the first d type flip flop in decoding unit needs to identify according to latch signal is latched
Confirmation, if necessary to 3 pulses continuously exported in the data port of identification controller, it is necessary to 3 the first d type flip flops.The
One d type flip flop completes shift function.Combinatorial logic unit is the logic circuit being made of multiple gate devices.
The latch decoding unit only passes through simple logic element and is both able to achieve to be restored using CLK signal and sdi signal
The function of latch signal, at low cost, structure is simple.
Chip provided by the utility model embodiment, to briefly describe, embodiment part does not refer to place, before can refer to
State corresponding contents in chip embodiment.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type, should all cover in the claim of the utility model and the range of specification.
Claims (3)
1. a kind of LED display driver IC, including controller, row scan drive cell, LED array and column output driving list
Member；Wherein the output end of the controller connects the input terminal of the row scan drive cell, the output of row scan drive cell
End connects the LED array；
The column output driving unit includes shift register, latch and constant current output unit；The data output end of controller
Mouth and clock port are connected to the shift register, and the output end of shift register is connected to the input terminal of the latch,
The output end of latch is connected to the input terminal of constant current output unit, and the output end of constant current output unit is connected to LED gusts described
Column；The enable port of controller is connected to the control terminal of constant current output unit；
It is characterized in that,
The column output driving unit further includes latching decoding unit；The data-out port and clock port of controller are also connected with
To the input terminal for latching decoding unit, the output end for latching decoding unit is connected to the control terminal of the latch.
2. LED display driver IC according to claim 1, which is characterized in that
Constant current output unit in the column output driving unit is multiple；
The data latch port of controller is additionally coupled to the control terminal of another constant current output unit in column output driving unit, the perseverance
The output end of stream output unit is connected to the LED array.
3. LED display driver IC according to claim 1, which is characterized in that
The latch decoding unit includes multiple first d type flip flops, delay unit, reverser, combinatorial logic unit and the 2nd D
Trigger；
All first d type flip flops are serially connected, wherein the power supply of the 1st the first d type flip flop terminates positive supply, N+1 the first D
The output end of power supply termination the first d type flip flop of n-th of trigger；The output of all first d type flip flops is connected to combinational logic
The input terminal of unit；The data segment of all first d type flip flops is connected to the data-out port of the controller；
The clock port of the controller is connected to the clock end of all first d type flip flops by the delay unit；Controller
Clock port also passes through the data terminal that the reverser connects the second d type flip flop；
The power end of output the second d type flip flop of termination of the combinatorial logic unit, the output of the second d type flip flop terminate the lock
The control terminal of storage, the power supply terminated clock of the second d type flip flop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920741572.3U CN209691366U (en) | 2019-05-22 | 2019-05-22 | LED display driver IC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920741572.3U CN209691366U (en) | 2019-05-22 | 2019-05-22 | LED display driver IC |
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| Publication Number | Publication Date |
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| CN209691366U true CN209691366U (en) | 2019-11-26 |
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| CN201920741572.3U Active CN209691366U (en) | 2019-05-22 | 2019-05-22 | LED display driver IC |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110070827A (en) * | 2019-05-22 | 2019-07-30 | 深圳市富满电子集团股份有限公司 | LED display driver IC, latch signal generation method and system |
| CN113205767A (en) * | 2021-04-29 | 2021-08-03 | 北京集创北方科技股份有限公司 | Data access adjustment method, display drive chip, electronic device, and storage medium |
-
2019
- 2019-05-22 CN CN201920741572.3U patent/CN209691366U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110070827A (en) * | 2019-05-22 | 2019-07-30 | 深圳市富满电子集团股份有限公司 | LED display driver IC, latch signal generation method and system |
| CN113205767A (en) * | 2021-04-29 | 2021-08-03 | 北京集创北方科技股份有限公司 | Data access adjustment method, display drive chip, electronic device, and storage medium |
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| GR01 | Patent grant | ||
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| CP03 | Change of name, title or address |
Address after: 518000 1701, building 1, Shenzhen new generation industrial park, 136 Zhongkang Road, Meidu community, Meilin street, Futian District, Shenzhen City, Guangdong Province Patentee after: Fuman microelectronics Group Co.,Ltd. Address before: 518000, 18 floor, west corner, Nong Yuan Road Times Technology Building, Xiangmi Lake street, Shenzhen, Guangdong, Futian District Patentee before: FINE MADE MICROELECTRONICS GROUP CO.,LTD. |
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| CP03 | Change of name, title or address |
Address after: 518000, Building 101, Fuman Microelectronics Group Co., Ltd., Intersection of Renmin East Road and Shouhe Road, Jinsha Community, Kengzi Street, Pingshan District, Shenzhen City, Guangdong Province Patentee after: Fuman microelectronics Group Co.,Ltd. Country or region after: China Address before: 518000 1701, building 1, Shenzhen new generation industrial park, 136 Zhongkang Road, Meidu community, Meilin street, Futian District, Shenzhen City, Guangdong Province Patentee before: Fuman microelectronics Group Co.,Ltd. Country or region before: China |