CN102411892B - Display control chip - Google Patents

Display control chip Download PDF

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Publication number
CN102411892B
CN102411892B CN 201110253948 CN201110253948A CN102411892B CN 102411892 B CN102411892 B CN 102411892B CN 201110253948 CN201110253948 CN 201110253948 CN 201110253948 A CN201110253948 A CN 201110253948A CN 102411892 B CN102411892 B CN 102411892B
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encryption
data
unit
display control
display
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CN102411892A (en
Inventor
李凤石
方翔
马钊
崔良金
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Beijing Tocel Electronics Co Ltd
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Beijing Tocel Electronics Co Ltd
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Abstract

The invention discloses a display control chip used for raising security of data and realizing chip integration. The display control chip comprises a display control unit, an encryption and decryption unit and a display drive unit. The display control unit is connected with the encryption and decryption unit. The encryption and decryption unit is connected with the display drive unit. The displaydrive unit is used for converting data of an oiling machine mainboard from outside of a control display chip into data with a data format needed by the encryption and decryption unit, sending the data to the encryption and decryption unit, and converting data sent by the encryption and decryption unit into series data and sending the series data to the oiling machine mainboard. The encryption anddecryption unit is used for carrying out decryption on received enciphered data sent by the display control unit, sending decrypted data to the display control unit, and sending identity authentication information to the oiling machine mainboard through the display control unit after carrying out encryption on the identity authentication information. The display control unit is used for converting the decrypted data into a liquid crystal drive signal and sending the liquid crystal drive signal to a liquid crystal display screen.

Description

A kind of display control chip
Technical field
The present invention relates to electronic technology and fuel charger field, particularly relate to display control chip.
Background technology
Fuel charger is as a kind of measurement instrument, and its accuracy of measuring is most important.Some fuel chargers are in the process that reality is used, and the accuracy of measuring is undesirable, have artificial or unartificial steathily oil and leakage of oil behavior.Have following main fraudulent means under the common situations: (1) revises the measuring software cheating, as changing the pulse equivalency in the measuring software; (2) pulse signal transmission channel cheating is as inserting pulse signal; (3) pulse signal source cheating: the multiple pulse signal that send, for example 100 pulses of actual generation, but send 110 pulses by intelligent device.Present fuel charger will possess anti-deception function, and explicitly calls for regard to aspects such as the technical requirement of anti-deception function, enforcements.Since " rules " are implemented, the common fuel charger cheatings such as " modification pulse equivalency ", " changing meter control mainboard ", " increase umber of pulse " have been stopped, effectively hit the illegal activities that utilize the fuel charger cheating, lead the consumer into a trap, promoted the harmonious development of industry.
But existing fuel pump against payment evasion scheme also reckons without the cheating of display screen link, and the lawless person still can from showing that link shows data tampering, show that wrong oil-filling data is to implement the purpose of cheating thereby reach to the user.There is no at present effective solution.
Summary of the invention
The embodiment of the invention provides a kind of display control chip, is used for improving the security of data, and realizes integrated chip.
A kind of display control chip may further comprise the steps: indicative control unit, encryption/decryption element and display driver unit; Indicative control unit is connected with encryption/decryption element, and encryption/decryption element is connected with the display driver unit;
Indicative control unit is used for being converted to from the data of the mainboard of oiling machine beyond the display control chip data layout that encryption/decryption element needs, and sends to encryption/decryption element;
Encryption/decryption element, the enciphered data that the indicative control unit that is used for receiving sends is decrypted, and sends to the display driver unit;
The display driver unit, the data after being used for deciphering are converted into liquid crystal driving signal and send to LCDs.
Increased encryption/decryption element in the embodiment of the invention, be used for the enciphered data that need show is decrypted, to improve data security; Simultaneously authentication information is encrypted processing.Because mainboard of oiling machine is serially-transmitted data, and encryption/decryption element is parallel data processing, in order to satisfy the rate requirement of encryption/decryption element, the embodiment of the invention has designed indicative control unit, is used for the serial data of mainboard of oiling machine output is converted to the data layout that encryption/decryption element needs.And the embodiment of the invention is integrated in indicative control unit, encryption/decryption element and display driver unit in the display control chip, has dwindled volume, has improved security.
Description of drawings
Fig. 1 is the basic block diagram of embodiment of the invention display control chip;
Fig. 2 is the detailed structure view of embodiment of the invention display control chip.
Embodiment
Increase encryption/decryption element in the embodiment of the invention, be used for the enciphered data that need show is decrypted processing, provide simultaneously the authentication information of encryption, to improve data security.Because mainboard of oiling machine is serially-transmitted data, and encryption/decryption element is parallel data processing, in order to satisfy the rate requirement of encryption/decryption element, example design of the present invention indicative control unit, be used for the serial data of mainboard of oiling machine output is converted to the data layout that encryption/decryption element needs.And provide all standards of multistage (for example 80 sections) liquid crystal display to drive signal, and support simultaneously to connect with a plurality of display driver chips, providing more, the multistage liquid crystal display drives.The embodiment of the invention is integrated in indicative control unit, encryption/decryption element and display driver unit in the display control chip, has dwindled volume, has improved security.
Referring to Fig. 1, display control chip 100 comprises indicative control unit 101, encryption/decryption element 102 and display driver unit 103 in the present embodiment.
Indicative control unit 101 is connected 102 with encryption/decryption element, and encryption/decryption element 102 is connected 103 with the display driver unit.Indicative control unit 101 also is connected with the mainboard of oiling machine 104 of display control chip 100 outsides, especially is connected with monitoring microprocessor in the mainboard of oiling machine.Display driver unit 103 also is connected with the display screen 105 of display control chip 100 outsides.Better, this display screen can be LCDs.
Indicative control unit 101 is used for and will be converted to the discernible data of encryption/decryption element from the data of the mainboard of oiling machine beyond the display control chip, and sends to encryption/decryption element 102.The encryption that encryption/decryption element 102 is used for receiving shows that data are decrypted processing, and sends to display driver unit 103.Send to indicative control unit Unit 101 after simultaneously authentication information being encrypted, by indicative control unit Unit 101 the enciphered data transformed into serial data is sent to the fuel charger monitoring microprocessor.Display driver unit 103 sends to display screen for the driving signal that the data-switching after the deciphering that will receive becomes liquid crystal display to need, for demonstration.
Display control chip and display location are in same veneer in the present embodiment.This veneer and mainboard of oiling machine are two veneers, thus when two veneers connect in order to guarantee security, need to carry out authentication.So the authentication request from mainboard of oiling machine that indicative control unit 101 also is used for receiving sends to encryption/decryption element 102, and receive the authentication information that encryption/decryption element 102 returns.Encryption/decryption element 102 also is used for receiving the authentication request that indicative control unit 101 sends, and authenticates after the deciphering, and sends to indicative control unit 101 after the authentication information encryption with chip.
Connect by pin between indicative control unit 101, encryption/decryption element 102 and the display driver unit 103, the below describes in detail to the structure of display control chip 100.
Referring to shown in Figure 2, display control chip 100 comprises chip operating voltage end VCC, ground voltage terminal VSS, liquid crystal drive positive voltage VDD, negative voltage VEE.
Indicative control unit 101 connects by SPI (serial peripheral interface, Serial Peripheral Interface) interface with mainboard of oiling machine, and the SPI interface comprises clock pin SPICLK, input pin MOSI and output pin MISO.For the ease of producers display control chip 100 is tested, indicative control unit 101 comprises test input pin TEST0 and test output pin TEST1.In order to control the liquid crystal upset, indicative control unit 101 also provides the common port com port.In order to realize that a monitoring microprocessor controls the demonstration of a plurality of display screens, indicative control unit 101 also provides two address pin in the present embodiment, realizes multihead display by different addresses are set.Indicative control unit 101 comprises two address pin A1 and A2 in the present embodiment.
Indicative control unit 101 and encryption/decryption element 102 by data bus (such as 8 bit data bus D[0:7]), write pin WR, read pin RD, latch control pin LE and be connected.
Encryption/decryption element 102 is connected with clock pin CLK by sequential pin LK, serial data line Data, logical shift control pin SHL with display driver unit 103.Better, sequential pin LK comprises than displacement sequential pin LK1 and data and latchs sequential pin LK2.
In order to guarantee the clock synchronous of indicative control unit 101 and encryption/decryption element 102, display control chip 100 also comprises: reset unit RST and clock unit CLK.Indicative control unit 101 is connected with encryption/decryption element and all is connected with clock unit with reset unit.
Display driver unit 103 comprises liquid crystal drive reference voltage pin, for example comprises four reference voltage pin V1, V2, V3 and V4.Four reference voltages that these four reference voltage pins provide are used for the control liquid crystal display.The display driver unit 103 also section of comprising drives pin, drives signal so that the liquid crystal section to be provided, and is used for the demonstration of control LCDs each point (or section), for example comprises altogether that 80 sections drive pin Seg1～Seg80.Display driver unit 103 also is connected with switch unit SW in the display control chip 100, and switch unit SW receives signal M, cooperates the upset of controlling liquid crystal with com port.Display driver unit 103 also comprises serial data output pin Dout.When the more display segment of display control chip 100 control, the end on display driver unit 103 drives pin and may be not enough to control more multistage liquid crystal display, therefore needs the display driver chip (general lcd drive chip) of a plurality of series connection.Data output pin Dout is used for sending data to next display driver chip.
Mainboard of oiling machine passes through clock pin SPICLK to indicative control unit 101 tranmitting data register signals, to guarantee the data transmission synchronization of mainboard of oiling machine and indicative control unit 101.When mainboard of oiling machine and display control chip 100 connected, mainboard of oiling machine sent enciphered data and authentication request by pin MOSI to indicative control unit 101; Authentication information after indicative control unit 101 is encrypted by the MISO reception.Indicative control unit 101 sends write signal by pin WR to encryption/decryption element 102, simultaneously by data bus D[0:7] send enciphered data and authentication request to encryption/decryption element 102.Encryption/decryption element 102 carries out data deciphering and authentication processing, and will issue indicative control unit 101 after the authentication information encryption.Indicative control unit 101 sends read signals by reading pin RD to encryption/decryption element 102, and encryption/decryption element 102 is received behind the read signal by data bus D[0:7] identification authentication data that sends after encrypting to indicative control unit 101.Indicative control unit 101 sends to mainboard of oiling machine by pin MISO with authentication information.Indicative control unit 101 need to reset when powering on, and this process is controlled by reset unit RST.Indicative control unit 101 is controlled by clock unit CLK with clock synchronous and the encryption and decryption clock of encryption/decryption element 102 signal transmissions.
After connecting, mainboard of oiling machine sends data for demonstration by pin MOSI to indicative control unit 101.Indicative control unit 101 is by pin MOSI serial received data, and the row format of going forward side by side is changed.Then, indicative control unit 101 sends write signals by pin WR to encryption/decryption element 102, and by data bus D[0:7] send data after the conversion with parallel mode to encryption/decryption element 102.Indicative control unit 101 is whenever write data and is sent an effective latch signal by latching pin LE, for example effectively latch signal is " 0 ", with the register in the locking encryption/decryption element 102, the data of being convenient in 102 pairs of registers of encryption/decryption element are decrypted processing.Indicative control unit 101 latchs control pin LE journey high-impedance state when the transmission of data, namely send invalid latch signal " 1 ".Afterwards, the data after encryption/decryption element 102 will be deciphered by data pin Data send to display driver unit 103 with serial mode.Simultaneously encryption/decryption element 102 by pin CLK to the display driver unit 103 tranmitting data register signals, to guarantee transmitting synchronous, and 103 send the displacement clock signals by pin LK1 to the display driver unit, the data of a bit of every transmission send a bit-level clock signal, 103 send and to latch clock signal to the display driver unit by pin LK2, complete demonstration data of every transmission send one and latch clock signal, show that data length can be pre-configured, and for example 64 or 128 compare top grade.Encryption/decryption element 102 also needs 103 to send the logical shift control signals by pin SHL to the display driver unit, transmits first low data or first transmitting high bit data with expression.For example, section drives the corresponding high position data of Seg1 among pin Seg1～Seg80, the corresponding low data of Seg80, and pin SHL sends high level signal and represents first transmitting high bit data, and then display driver unit 103 sequentially corresponds to Seg1～Seg80 with the data of receiving.Display driver unit 103 is by the demonstration of Seg1～Seg80 control display screen.Indicative control unit 101 confirms by pin A1 and A2 control display screen address whether the data on the spi bus are this screen data.
When display control chip 100 is not connected with mainboard of oiling machine, producers may need display control chip 100 is tested, then input data by pin TEST0 to indicative control unit 101, and the data that obtain indicative control unit 101 outputs by pin TEST1.
The present embodiment is in order to improve the security of data, and encryption/decryption element 102 adopts the data fingerprint technology, when showing that data are destroyed or distorted, can carry out the data integrity state recognition.For example, mainboard of oiling machine is to the enciphered data of display control chip 100 transmission with finger print information, after encryption/decryption element 102 is received enciphered data, be decrypted processing, the finger print information that obtains is compared, if inconsistent, then specified data is revised, can return alert command etc. to mainboard of oiling machine, simultaneously warning on liquid crystal display; If consistent, then specified data safety will show that data send to display driver unit 103 for demonstration.
Increased encryption/decryption element in the embodiment of the invention, the data and the authentication information that are used for need are shown are carried out the encryption and decryption processing, to improve data security.The employing standard of communicating by letter with mainboard of oiling machine SPI universal serial bus, serial data and conversion are finished by indicative control unit.And the embodiment of the invention is integrated in indicative control unit, encryption/decryption element and display driver unit in the display control chip, has dwindled volume, has improved security.The embodiment of the invention also provides the authentication process so that security to be provided.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware implementation example, complete implement software example or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form of the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disk memory and optical memory etc.) that wherein include computer usable program code.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (14)

1. a display control chip is characterized in that, comprising: indicative control unit, encryption/decryption element and display driver unit; Indicative control unit is connected with encryption/decryption element, and encryption/decryption element is connected with the display driver unit;
Indicative control unit is used for being converted to from the data of the mainboard of oiling machine beyond the display control chip data layout that encryption/decryption element needs, and sends to encryption/decryption element;
Encryption/decryption element, the enciphered data that the indicative control unit that is used for receiving sends is decrypted, and sends to the display driver unit;
The display driver unit, the data after being used for deciphering are converted into liquid crystal driving signal and send to LCDs.
2. display control chip as claimed in claim 1 is characterized in that, indicative control unit is used for that also the data that encryption/decryption element sends are converted to serial data and sends to mainboard of oiling machine.
3. display control chip as claimed in claim 1 is characterized in that, encryption/decryption element also is used for and will issues mainboard of oiling machine by indicative control unit after the authentication information encryption.
4. display control chip as claimed in claim 1 is characterized in that, the display driver unit comprises be used to providing all standards of multistage liquid crystal display to drive the pin of signal.
5. display control chip as claimed in claim 1 is characterized in that, indicative control unit is connected by writing the WR pin with encryption/decryption element, and connects by reading the RD pin.
6. display control chip as claimed in claim 1 is characterized in that, indicative control unit is connected by data bus with encryption/decryption element, and this data bus is used for indicative control unit and encryption/decryption element carries out exchanges data;
Encryption/decryption element is connected by serial data line Data with the display driver unit.
7. display control chip as claimed in claim 1 is characterized in that, indicative control unit is connected by latching control LE pin with encryption/decryption element.
8. display control chip as claimed in claim 1 is characterized in that, also comprises: reset unit and be used for controlling synchronous clock unit;
Indicative control unit and encryption/decryption element all are connected with clock unit with reset unit.
9. display control chip as claimed in claim 1 is characterized in that, encryption/decryption element is connected by sequential control LK pin with the display driver unit.
10. display control chip as claimed in claim 9 is characterized in that, sequential control LK pin comprises that data displacement sequential pin (LK1) and data latch sequential pin (LK2).
11. display control chip as claimed in claim 1 is characterized in that, encryption/decryption element is connected by direction of displacement control SHL pin with the display driver unit.
12. display control chip as claimed in claim 1 is characterized in that, encryption/decryption element is connected by being used for controlling synchronous clock pin with the display driver unit.
13. display control chip as claimed in claim 1 is characterized in that, display control chip is connected with the display driver chip of a plurality of series connection.
14. display control chip as claimed in claim 1 is characterized in that, display control chip is connected by standard serial peripheral interface SPI with mainboard of oiling machine.
CN 201110253948 2011-08-31 2011-08-31 Display control chip Active CN102411892B (en)

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WO2018006413A1 (en) * 2016-07-08 2018-01-11 韩性峰 Transmission method without reducing the number of chips connected in cascade in tandem system
WO2018006421A1 (en) * 2016-07-08 2018-01-11 韩性峰 Data transmission method for chips connected in series
CN111063287B (en) * 2018-10-17 2023-05-09 西安诺瓦星云科技股份有限公司 Display control system
CN111063286B (en) * 2018-10-17 2023-06-16 西安诺瓦星云科技股份有限公司 Display control system and display unit board
CN111063285B (en) * 2018-10-17 2023-05-09 西安诺瓦星云科技股份有限公司 Display control system and display unit board

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KR100408021B1 (en) * 2000-12-29 2003-12-01 엘지전자 주식회사 Interface apparatus and method for lcd system
JP4661401B2 (en) * 2005-06-30 2011-03-30 セイコーエプソン株式会社 Integrated circuit device and electronic apparatus
JP2007094391A (en) * 2005-08-31 2007-04-12 Matsushita Electric Ind Co Ltd Moving image display apparatus
JP2008039801A (en) * 2006-08-01 2008-02-21 M & S Fine Tec Kk Liquid crystal display device and system and method of controlling backlight for liquid crystal display device
CN201146623Y (en) * 2007-11-12 2008-11-05 华楷光电通讯股份有限公司 Control apparatus for LED lamp
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CN202205437U (en) * 2011-08-31 2012-04-25 北京拓盛电子科技有限公司 Display and control chip

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