CN112562578A - LED and LCD display driving circuit supporting integrated touch key function - Google Patents
LED and LCD display driving circuit supporting integrated touch key function Download PDFInfo
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- CN112562578A CN112562578A CN202011422384.8A CN202011422384A CN112562578A CN 112562578 A CN112562578 A CN 112562578A CN 202011422384 A CN202011422384 A CN 202011422384A CN 112562578 A CN112562578 A CN 112562578A
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- touch
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- 238000001514 detection method Methods 0.000 claims description 4
- 101000746134 Homo sapiens DNA endonuclease RBBP8 Proteins 0.000 claims description 3
- 101000969031 Homo sapiens Nuclear protein 1 Proteins 0.000 claims description 3
- 102100021133 Nuclear protein 1 Human genes 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
Abstract
The invention discloses an LED and LCD display driving circuit supporting an integrated touch key function, which comprises an LED and an LCD driving chip, wherein driving pins of the LED and the LCD driving chip are two poles, marked as SEG and COM, each SEG pin consists of a touch driving circuit, an LED/LCD driving circuit, a filter circuit and a function switch; and each COM pin is connected with the logic control circuit through a state control switch. Through the mode, the touch drive is integrated in the LED or LCD display drive chip, the time-sharing multiplexing function of the pins of the LED or LCD display drive and the touch drive is realized, the product design peripheral circuit is simplified, the number of elements is reduced, the cost is reduced, and the product stability is improved.
Description
Technical Field
The invention relates to the technical field of touch screen key functions and display driving circuits, in particular to an LED and LCD display driving circuit supporting an integrated touch key function.
Background
Hundreds of millions of mechanical buttons of household appliances, consumer electronics, industrial control applications and the like have been replaced by capacitive sensing buttons, the use of capacitive sensing control technology makes the applications more beautiful, easy to use, flexible and durable, and the display device is an essential module in electronic products, including LED indicator lamps, LED display screens, LCD display screens and the like.
Capacitive touch key needs extra driver chip in use than traditional mechanical key, the touch drive that uses in the present touch class electronic product is the single-chip mode mostly, the part is MCU integration, MCU integrated touch drive, when MCU's pin selection is the touch mode, its function is just single solidification, occupy an MCU pin, it is more that equipment needs touch key, shared MCU pin number is just corresponding more, MCU's encapsulation peripheral hardware cost all corresponding increase, single function touch driver chip not only faces the same cost problem, also face extra chip and taken up inside PCB space problem when equipment is miniaturized, based on above defect and not enough, it improves to be necessary to current technique, design a LED that supports integrated touch key function, LCD display driver circuit.
Disclosure of Invention
The invention mainly solves the technical problem of providing the LED and LCD display driving circuit supporting the integrated touch key function, which can realize the integration of touch driving in an LED or LCD display driving chip, does not additionally increase chip pins, realizes the time-sharing multiplexing function of the LED or LCD display driving and the touch driving pins, simplifies the product design peripheral circuit, reduces the number of elements, reduces the cost and improves the product stability.
In order to solve the technical problems, the invention adopts a technical scheme that: the LED and LCD display driving circuit comprises an LED and an LCD driving chip, wherein driving pins of the LED and the LCD driving chip are two poles and marked as SEG and COM, each SEG pin consists of a touch driving circuit, an LED/LCD driving circuit, a filter circuit and a function switch, a logic control circuit of the LED and LCD driving chip is connected with the touch driving circuit and the LED/LCD driving circuit which are connected in parallel, the touch driving circuit and the LED/LCD driving circuit which are connected in parallel are connected to the SEG pins through the function switch, and the circuit is connected with the filter circuit; and each COM pin is connected with the logic control circuit through a state control switch.
Preferably, the SEG pins and the COM pins in corresponding numbers are selected according to the number of the LED display points and the LCD display points, and the LED display point array and the LCD display point array are connected with the corresponding SEG pins and the COM pins.
Preferably, the SEG pin output has four driving states, which are a high level, a middle level (1/2, 1/3, 1/4 level, etc.), a low level, and a touch detection state; the COM pin output has four driving states, namely high level, medium level (1/2, 1/3, 1/4 level and the like), low level and high resistance state.
Preferably, the touch driving circuit and the LED/LCD driving circuit correspond to touch driving and display driving, respectively, the touch driving and the display driving share a chip pin SEG in a time-sharing switch driving manner, the time-sharing switch is a function switch, in the display driving mode, a COM pin is used for scanning in a cyclic low level state, the time from COM1 scanning to COMn scanning is T, the next time is T1, and the total execution period is T + T1 corresponding to the touch driving mode.
Compared with the prior art, the invention has the beneficial effects that:
the circuit can realize the integration of touch drive in the LED or LCD display drive chip, does not additionally increase chip pins, and realizes the time-sharing multiplexing function of the pins of the LED or LCD display drive and the touch drive. The product design peripheral circuit is simplified, the number of elements is reduced, the cost is reduced, and the product stability is improved
Drawings
Fig. 1 is a circuit diagram of a display driving circuit of an LED and an LCD supporting an integrated touch key function.
Fig. 2 is an application circuit diagram of an LED and LCD display driving circuit supporting an integrated touch key function.
FIG. 3 is a schematic diagram of the total execution cycle of an LED and LCD display driver circuit supporting the integrated touch key function.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the invention can be more readily understood by those skilled in the art, and the scope of the invention will be more clearly defined.
Referring to fig. 1 to 3, an embodiment of the present invention includes:
a support LED, LCD display drive circuit of the integrated touch key function, this kind of support LED, LCD display drive circuit of the integrated touch key function includes LED, LCD driver chip, the drive foot of LED, LCD driver chip is two poles, mark SEG and COM, every SEG foot is by touching the drive circuit, LED/LCD driver circuit, filter circuit, function change-over switch to make up, LED, logic control circuit of LCD driver chip connect touch drive circuit and LED/LCD driver circuit connected in parallel, touch drive circuit and LED/LCD driver circuit connected to SEG foot through the function change-over switch in parallel, connect with the filter circuit on the circuit; each COM pin is connected with the logic control circuit through a state control switch, and the circuit connection is shown in figure 1.
And selecting corresponding quantities of SEG and COM pins according to the number of the LED and LCD display points, and connecting the LED and LCD display point arrays with the corresponding SEG and COM pins as shown in figure 2.
The SEG pin outputs four driving states, namely a high level, a middle level (1/2, 1/3, 1/4 levels and the like), a low level and a touch detection state; the COM pin output has four driving states, namely high level, medium level (1/2, 1/3, 1/4 level and the like), low level and high resistance state.
The touch driving circuit and the LED/LCD driving circuit respectively correspond to touch driving and display driving, the touch driving and the display driving share a chip pin SEG pin in a time-sharing switch driving mode, a time-sharing switch is a function switching switch, in a display driving mode, COM pins are adopted for circulating low-level state scanning, the time from COM1 scanning to COMn scanning is T, the next time is T1, corresponding to the touch driving mode, the total execution period is T + T1, and the execution period is shown in FIG. 3.
When the LED and LCD display driving circuit supporting the integrated touch key function works, when a pin is used for display driving, the logic control circuit controls all the function change-over switches to enable the SEG pin to be connected to the LED/LCD driving circuit, and simultaneously the touch driving circuit is disconnected, the LED/LCD driving circuit outputs three driving states of high level, medium level (1/2, 1/3, 1/4 level and the like) and low level through the SEG pin according to display requirements, and simultaneously the logic control circuit controls all the state control switches according to the display requirements to enable the COM pin to output three driving states of high level, medium level (1/2, 1/3, 1/4 level and the like) and low level to circularly scan in T time; when the pins are used for touch driving, in the time T1, the logic control circuit controls all the function switches to enable the SEG pins to be connected to the touch driving circuit, the LED/LCD driving circuit is disconnected, the logic control circuit controls the state control switch to enable the COM pins to be changed into a high-resistance state, the touch driving circuit sends out touch detection waveforms through the SEG pins, and when touch is detected, the logic control circuit is informed to modify corresponding registers, and the display driving and the touch driving are completed in a circulating mode.
According to the LED and LCD display driving circuit supporting the integrated touch key function, the touch drive can be integrated in the LED or LCD display driving chip, the chip pins are not additionally arranged, the time-sharing multiplexing function of the pins of the LED or LCD display driving and the touch driving is realized, the product design peripheral circuit is simplified, the number of elements is reduced, the cost is reduced, and the product stability is improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. The utility model provides a support LED, LCD display drive circuit of integrated touch button function which characterized in that: the LED and LCD display driving circuit supporting the integrated touch key function comprises an LED and an LCD driving chip, wherein driving pins of the LED and the LCD driving chip are two poles, marked as SEG and COM, each SEG pin consists of a touch driving circuit, an LED/LCD driving circuit, a filter circuit and a function change-over switch, a logic control circuit of the LED and the LCD driving chip is connected with the touch driving circuit and the LED/LCD driving circuit which are connected in parallel, the touch driving circuit and the LED/LCD driving circuit which are connected in parallel are connected to the SEG pins through the function change-over switches, and the filter circuit is connected to the circuit; and each COM pin is connected with the logic control circuit through a state control switch.
2. The LED and LCD display driving circuit supporting the integrated touch key function according to claim 1, wherein: and selecting SEG pins and COM pins in corresponding quantity according to the number of the LED display points and the LCD display points.
3. The LED and LCD display driving circuit supporting the integrated touch key function according to claim 1, wherein: the SEG pin outputs four driving states, namely a high level, a middle level (1/2, 1/3, 1/4 levels and the like), a low level and a touch detection state; the COM pin output has four driving states, namely high level, medium level (1/2, 1/3, 1/4 level and the like), low level and high resistance state.
4. The LED and LCD display driving circuit supporting the integrated touch key function according to claim 1, wherein: the touch driving circuit and the LED/LCD driving circuit respectively correspond to touch driving and display driving, the touch driving and the display driving share a chip pin SEG pin in a time-sharing switch driving mode, a time-sharing switch is a function switching switch, in the display driving mode, a COM pin is adopted for circulating low-level state scanning, the time from COM1 scanning to COMn scanning is T, the next time is T1, and the total execution period is T + T1 corresponding to the touch driving mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011422384.8A CN112562578A (en) | 2020-12-08 | 2020-12-08 | LED and LCD display driving circuit supporting integrated touch key function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011422384.8A CN112562578A (en) | 2020-12-08 | 2020-12-08 | LED and LCD display driving circuit supporting integrated touch key function |
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| CN112562578A true CN112562578A (en) | 2021-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011422384.8A Pending CN112562578A (en) | 2020-12-08 | 2020-12-08 | LED and LCD display driving circuit supporting integrated touch key function |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113595558A (en) * | 2021-09-30 | 2021-11-02 | 杭州米芯微电子有限公司 | Multi-key judgment system based on LCD pin multiplexing |
| CN114023187A (en) * | 2021-10-26 | 2022-02-08 | 深圳市爱协生科技有限公司 | Touch-controlled segment code display screen |
| CN114201078A (en) * | 2022-02-18 | 2022-03-18 | 深圳贝特莱电子科技股份有限公司 | Touch device, equipment and method for improving LED display performance |
| CN115080478A (en) * | 2022-06-09 | 2022-09-20 | 苏州大学 | Embedded platform display system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113595558A (en) * | 2021-09-30 | 2021-11-02 | 杭州米芯微电子有限公司 | Multi-key judgment system based on LCD pin multiplexing |
| CN114023187A (en) * | 2021-10-26 | 2022-02-08 | 深圳市爱协生科技有限公司 | Touch-controlled segment code display screen |
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| CN115080478B (en) * | 2022-06-09 | 2023-10-27 | 苏州大学 | Embedded platform display system |
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Application publication date: 20210326 |
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