CN204834004U - High accuracy constant current LED driver chip of built -in multichannel scanning pulse density modulation control - Google Patents
High accuracy constant current LED driver chip of built -in multichannel scanning pulse density modulation control Download PDFInfo
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- CN204834004U CN204834004U CN201520610472.9U CN201520610472U CN204834004U CN 204834004 U CN204834004 U CN 204834004U CN 201520610472 U CN201520610472 U CN 201520610472U CN 204834004 U CN204834004 U CN 204834004U
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Abstract
The utility model discloses a high accuracy constant current LED driver chip of built -in multichannel scanning pulse density modulation control, including image data order data displacement register, 16 scanning gray scale latchs, 16 M -PDM generators, 16 scanning counters, scanning switching control ware, 16 constant current output driver, 16 order latchs and 6 whole electric current gain control wares, image data order data displacement register is provided with serial data input end (DI), data clock signal input (DCK) and serial data output end (DO), the utility model has the advantages of: can realize the constant current output of high accuracy, multichannel scanning pulse density modulation is controlled, low ash compensation and the first partially secretly compensation function that sweeps, has the automatic black function of inserting, a lot of driver cascade operation, promote the picture refresh rate of dynamic scan screen by a wide margin, reduce electromagnetic interference.
Description
Technical field
The utility model relates to electrical engineering field, particularly a kind of triple channel high precision constant current LED drive chip.
Background technology
LED is a kind of efficient, durable, safe light source, is called as forth generation lighting source, becomes the major way of mankind's illumination gradually.Meanwhile, LED Driving technique also achieve larger progress.LED drive chip is the key function part in LED illumination System, and along with the raising of people's quality of life, it is also proposed higher requirement to LED illumination, the technical renovation of LED drive chip also faces new challenges.
LED has in indoor and outdoor LED display board, variable consulting billboard (VMS), LED dot matrix module, building and decorative lighting, industrial lighting and LCD display backlight field and applies comparatively widely, but the product existed at present is because there is more defect in the function imperfection of its driving chip: when during Dynamic Announce, lower, the low grey effect imperfection of refresh rate, dynamic driving are used, picture easily occurs motion blur phenomenon, is vulnerable to electromagnetic interference (EMI).
Therefore, market proposes higher demand to LED and driving chip thereof: high-precision constant current output; Multi-channel scanning impulse density modulation controls, and low ash compensates sweeps partially dark compensate function with first; Automatic black insertion technology; Multiple driver cascade operation; Significantly promote the picture refreshing rate of dynamic scan screen, reduce electromagnetic interference (EMI).Comprehensive the demand, the high precision constant current LED drive chip that a built-in multi-channel scanning impulse density modulation that can meet above function controls has wide market outlook.
Utility model content
The purpose of this utility model is the high precision constant current LED drive chip that a kind of built-in multi-channel scanning impulse density modulation provided to solve above-mentioned the deficiencies in the prior art controls, and can realize high-precision constant current output; Multi-channel scanning impulse density modulation controls, and low ash compensates sweeps partially dark compensate function with first; There is automatic black insertion technology; Can multiple driver cascade operation; Significantly promote the picture refreshing rate of dynamic scan screen, reduce electromagnetic interference (EMI).
To achieve these goals, the high precision constant current LED drive chip that a kind of built-in multi-channel scanning impulse density modulation designed by the utility model controls, comprise image data/order data shift register, 16 bit scan GTG latchs, 16 M-PDM generators, 16 bit scan counters, scanning switch controller, 16 constant current output drivers, 16 order of the bit latchs and 6 overall current gain controllers, described image data/order data shift register is provided with serial data input (DI), data clock signal input terminal (DCK) and serial data output terminal (DO), described 16 bit scan GTG latchs and described 16 order of the bit latchs are provided with latches data and scan pattern set input (LAT), described 16 bit scan counters and described scanning switch controller are provided with gray scale clock signal input end (GCK), described 6 overall current gain controllers are provided with outer meeting resistance input end (REXT), described 16 constant current output drivers are provided with constant current output end (OUT),
Described image data/order data shift register is connected with described 16 bit scan GTG latchs, described 16 bit scan GTG latchs are connected with described 16 M-PDM generators, and described 16 M-PDM generators are connected with described 16 constant current output drivers;
Described image data/order data shift register is connected with described 16 order of the bit latchs, described 16 order of the bit latchs are connected with described 6 overall current gain controllers, and described 6 overall current gain controllers are connected with described 16 constant current output drivers;
Described scanning switch controller is connected with described 16 bit scan GTG latchs;
Described 16 bit scan counters are connected with described 16 M-PDM generators.
Further, the high precision constant current LED drive chip that built-in multi-channel scanning impulse density modulation controls, the high precision constant current LED drive chip that described built-in multi-channel scanning impulse density modulation controls is provided with steering logic and drive current earth terminal (GND) and chip power and supplies section (VDD).
Further, the high precision constant current LED drive chip that a kind of built-in multi-channel scanning impulse density modulation controls, the high precision constant current LED drive chip that described built-in multi-channel scanning impulse density modulation controls adopts SSOP24 to encapsulate pattern or QFN24 encapsulates pattern.
Further, the high precision constant current LED drive chip that a kind of built-in multi-channel scanning impulse density modulation controls, the constant current output end (OUT) of described 16 constant current output drivers is provided with 16, described 16 M-PDM generators are provided with 16, and described 16 bit scan GTG latchs are provided with 16.
Described steering logic and drive current earth terminal (GND) are grounded function, serial data input (DI) and serial data output terminal (DO) realize the input and output of data, and serial data output terminal (DO) can realize multiple driver simultaneously can cascade operation; The displacement of data clock signal input terminal (DCK) data can occur in clock rising edge; Latches data and scan pattern set input (LAT) combined with file clock signal input terminal (DCK) can performing data transmission initialization directive or overall data latch; Gray scale clock signal input end (GCK) is used for performing M-PDM rolling counters forward and automatic black plug function; Outer meeting resistance input end (REXT) can set the constant current output of all output channels.
The high precision constant current LED drive chip that a kind of built-in multi-channel scanning impulse density modulation that the utility model obtains controls, can realize high-precision constant current output; Multi-channel scanning impulse density modulation controls, and low ash compensates sweeps partially dark compensate function with first; There is automatic black insertion technology; Can multiple driver cascade operation; Significantly promote the picture refreshing rate of dynamic scan screen, reduce electromagnetic interference (EMI).
The utility model has the advantage of:
1, high-precision constant current output can be realized;
2, multi-channel scanning impulse density modulation controls, and low ash compensates sweeps partially dark compensate function with first;
3, there is automatic black insertion technology;
4, can multiple driver cascade operation;
5, significantly promote the picture refreshing rate of dynamic scan screen, reduce electromagnetic interference (EMI).
Accompanying drawing explanation
Fig. 1 is the function block schematic diagram of embodiment.
Fig. 2 is the equivalent circuit diagram of DCK, DI, LAT, GCK input end.
Fig. 3 is the equivalent circuit diagram of DO output terminal.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Embodiment:
As shown in the figure, the high precision constant current LED drive chip that a kind of built-in multi-channel scanning impulse density modulation controls, image data/order data shift register, 16 bit scan GTG latchs, 16 M-PDM generators, 16 bit scan counters, scanning switch controller, 16 constant current output drivers, 16 order of the bit latchs and 6 overall current gain controllers, described image data/order data shift register is provided with serial data input (DI), data clock signal input terminal (DCK) and serial data output terminal (DO); Described 16 bit scan GTG latchs and described 16 order of the bit latchs are provided with latches data and scan pattern set input (LAT); Described 16 bit scan counters and described scanning switch controller are provided with gray scale clock signal input end (GCK); Described 6 overall current gain controllers are provided with outer meeting resistance input end (REXT); Described 16 constant current output drivers are provided with constant current output end (OUT);
Described image data/order data shift register is connected with described 16 bit scan GTG latchs, described 16 bit scan GTG latchs are connected with described 16 M-PDM generators, and described 16 M-PDM generators are connected with described 16 constant current output drivers;
Described image data/order data shift register is connected with described 16 order of the bit latchs, described 16 order of the bit latchs are connected with described 6 overall current gain controllers, and described 6 overall current gain controllers are connected with described 16 constant current output drivers;
Described scanning switch controller is connected with described 16 bit scan GTG latchs;
Described 16 bit scan counters are connected with described 16 M-PDM generators.
Described steering logic and drive current earth terminal (GND) are grounded function, serial data input (DI) and serial data output terminal (DO) realize the input and output of data, and serial data output terminal (DO) can realize multiple driver simultaneously can cascade operation; The displacement of data clock signal input terminal (DCK) data can occur in clock rising edge; Latches data and scan pattern set input (LAT) combined with file clock signal input terminal (DCK) can performing data transmission initialization directive or overall data latch; Gray scale clock signal input end (GCK) is used for performing M-PDM rolling counters forward and automatic black plug function; Outer meeting resistance input end (REXT) can set the constant current output of all output channels.
The high precision constant current LED drive chip that described built-in multi-channel scanning impulse density modulation controls is provided with steering logic and drive current earth terminal (GND) and chip power and supplies section (VDD); The high precision constant current LED drive chip that described built-in multi-channel scanning impulse density modulation controls adopts SSOP24 to encapsulate pattern or QFN24 encapsulates pattern; The constant current output end (OUT) of described 16 constant current output drivers is provided with 16, and described 16 M-PDM generators are provided with 16, and described 16 bit scan GTG latchs are provided with 16.
As shown in Figure 2, be the equivalent circuit diagram of DCK, DI, LAT, GCK input end; Be illustrated in figure 3 the equivalent circuit diagram of DO output terminal.
The high precision constant current LED drive chip that a kind of built-in multi-channel scanning impulse density modulation that the present embodiment obtains controls, can realize high-precision constant current output; Multi-channel scanning impulse density modulation controls, and low ash compensates sweeps partially dark compensate function with first; There is automatic black insertion technology; Can multiple driver cascade operation; Significantly promote the picture refreshing rate of dynamic scan screen, reduce electromagnetic interference (EMI).
The advantage of the present embodiment is:
1, high-precision constant current output can be realized;
2, multi-channel scanning impulse density modulation controls, and low ash compensates sweeps partially dark compensate function with first;
3, there is automatic black insertion technology;
4, can multiple driver cascade operation;
5, significantly promote the picture refreshing rate of dynamic scan screen, reduce electromagnetic interference (EMI).
For the utility model person of an ordinary skill in the technical field; without departing from the concept of the premise utility; its framework form can be flexible and changeable; just make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the utility model is determined by submitted to claims.
Claims (4)
1. the high precision constant current LED drive chip of a built-in multi-channel scanning impulse density modulation control, comprise image data/order data shift register, 16 bit scan GTG latchs, 16 M-PDM generators, 16 bit scan counters, scanning switch controller, 16 constant current output drivers, 16 order of the bit latchs and 6 overall current gain controllers, it is characterized in that: described image data/order data shift register is provided with serial data input (DI), data clock signal input terminal (DCK) and serial data output terminal (DO); Described 16 bit scan GTG latchs and described 16 order of the bit latchs are provided with latches data and scan pattern set input (LAT); Described 16 bit scan counters and described scanning switch controller are provided with gray scale clock signal input end (GCK); Described 6 overall current gain controllers are provided with outer meeting resistance input end (REXT); Described 16 constant current output drivers are provided with constant current output end (OUT);
Described image data/order data shift register is connected with described 16 bit scan GTG latchs, described 16 bit scan GTG latchs are connected with described 16 M-PDM generators, and described 16 M-PDM generators are connected with described 16 constant current output drivers;
Described image data/order data shift register is connected with described 16 order of the bit latchs, described 16 order of the bit latchs are connected with described 6 overall current gain controllers, and described 6 overall current gain controllers are connected with described 16 constant current output drivers;
Described scanning switch controller is connected with described 16 bit scan GTG latchs;
Described 16 bit scan counters are connected with described 16 M-PDM generators.
2. the high precision constant current LED drive chip of a kind of built-in multi-channel scanning impulse density modulation control according to claim 1, is characterized in that: the high precision constant current LED drive chip that described built-in multi-channel scanning impulse density modulation controls is provided with steering logic and drive current earth terminal (GND) and chip power and supplies section (VDD).
3. the high precision constant current LED drive chip of a kind of built-in multi-channel scanning impulse density modulation control according to claim 1, is characterized in that: the high precision constant current LED drive chip that described built-in multi-channel scanning impulse density modulation controls adopts SSOP24 to encapsulate pattern or QFN24 encapsulates pattern.
4. the high precision constant current LED drive chip of a kind of built-in multi-channel scanning impulse density modulation control according to claim 1, it is characterized in that: the constant current output end (OUT) of described 16 constant current output drivers is provided with 16, described 16 M-PDM generators are provided with 16, and described 16 bit scan GTG latchs are provided with 16.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520610472.9U CN204834004U (en) | 2015-08-14 | 2015-08-14 | High accuracy constant current LED driver chip of built -in multichannel scanning pulse density modulation control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520610472.9U CN204834004U (en) | 2015-08-14 | 2015-08-14 | High accuracy constant current LED driver chip of built -in multichannel scanning pulse density modulation control |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112233604A (en) * | 2020-10-15 | 2021-01-15 | Tcl华星光电技术有限公司 | Display panel and display device |
| CN113163553A (en) * | 2021-03-11 | 2021-07-23 | 深圳市帝麦德斯科技有限公司 | 18-channel high-precision constant-current LED driving chip |
| CN114464124A (en) * | 2020-10-30 | 2022-05-10 | 西安诺瓦星云科技股份有限公司 | Display device, display method thereof, processor and computer storage medium |
| US11877492B2 (en) | 2019-03-26 | 2024-01-16 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | OLED display device including touch sensors and method for manufacturing same |
-
2015
- 2015-08-14 CN CN201520610472.9U patent/CN204834004U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11877492B2 (en) | 2019-03-26 | 2024-01-16 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | OLED display device including touch sensors and method for manufacturing same |
| CN112233604A (en) * | 2020-10-15 | 2021-01-15 | Tcl华星光电技术有限公司 | Display panel and display device |
| US11694593B2 (en) | 2020-10-15 | 2023-07-04 | Tcl China Star Optoelectronics Technology Co., Ltd | Display panel and display device |
| CN114464124A (en) * | 2020-10-30 | 2022-05-10 | 西安诺瓦星云科技股份有限公司 | Display device, display method thereof, processor and computer storage medium |
| CN113163553A (en) * | 2021-03-11 | 2021-07-23 | 深圳市帝麦德斯科技有限公司 | 18-channel high-precision constant-current LED driving chip |
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