CN100336064C - Universal dot matrix liquid crystal display controller and its application software developing system - Google Patents
Universal dot matrix liquid crystal display controller and its application software developing system Download PDFInfo
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Abstract
The present invention relates to a universal lattice liquid crystal display controller. The present invention is applied to liquid crystal display modules with various standard lattice scales (from 128*32, 64*64 to 320*240) and supports a data preparation function and a Chinese-English language full word stock, and the application software is convenient for adopting a computer aided design. The display control device is composed of a microprocessor core, an interface part, a drive control part and a mask procedure, wherein a data channel and a command channel of the interface part are separated, the data channel adopts a stack structure and maps each unit to the internal RAM address space of the microprocessor core, and fast parallel operation is realized. The drive control part and the microprocessor core are in time-sharing multiplexing with an external bus, and continuous display is realized.
Description
Technical field
The present invention relates to a kind of display control unit, particularly relate to a kind of general lattice lcd display control unit, and relate to the applied software development system of this display control unit.
Background technology
The inner structure of tradition dot matrix lcd module and external interface are as shown in Figure 1.Dot matrix lcd module 11 is made up of matrix liquid-crystal display screen 111, video data random access memory 112, lattice lcd display control unit 113 and ranks drive unit 114.The video data overwhelming majority of dot matrix lcd module 11 is responsible for computing and processing by microprocessor 12, and directly or by lattice lcd display control unit 113 is stored in indirectly in the video data random access memory 112.The data that are stored in the video data random access memory 112 send to ranks drive unit 114 in an orderly manner by lattice lcd display control unit 113, make matrix liquid-crystal display screen 111 demonstrate figure, image or the literal of expection.Therefore, for the application of dot matrix lcd module, mainly be the interface problem of handling external microprocessor and display control unit, and interface comprise hardware interface and software interface.
Hardware interface mainly is divided into parallel interface and serial line interface.Adopt which kind of interface mainly to decide on the amount of communication data between external microprocessor and the display control unit.The employing parallel interface that data volume is big, what data volume was little can adopt serial line interface.The traffic rate height of parallel interface, but the I/O mouth resource that takies external microprocessor is many, and in order to guarantee data communication rates, generally require external microprocessor directly to support the read-write operation of parallel port, so it has limited the kind of the external microprocessor of interface with it.Serial line interface can be realized by hardware circuit, also can be realized by software programming, so it almost is applicable to the microprocessor of all band I/O mouths that still, the traffic rate of serial line interface is low, only is applicable to the LCD MODULE of point battle array scale at present.
Software interface is meant the form and the implication of data transfer, by the built-in function decision of display control unit.The program that external microprocessor is worked out in order to control LCD MODULE is called the application software (as previously mentioned, being exactly the application software of display control unit in fact) of this LCD MODULE.The power of display control unit built-in function is the principal element that influences its applied software development efficient.At present, the built-in function of various display control units mainly is limited to the read-write operation to the video data random access memory, and specifically how to arrange the storage address of video data still will to be responsible for by external microprocessor, therefore, its application software more complicated, development efficiency is not high.The notion of character generator has been simplified the operation that character shows, but following shortcoming is still arranged, as: character position is fixed, number of characters is limited, lattice type is single etc.
In addition, the display control unit that LCD MODULE adopted of different dot matrix scales is not quite similar, therefore has different software interfaces, this makes that the consistance of lcd applications software is relatively poor, be unfavorable for the raising of whole society development efficiency, in other words, different software interfaces make people be difficult to sum up unified applied software development method.
At present, exist a kind of scheme (with " single-chip microcomputer and embedded system are used " 2002 the 1st interim " realizing the graphic dot matrix Liquid Crystal Module application technology of visual programming " Wen Wei representative) can partly solve the unitarity problem of dot matrix lcd module software interface.This scheme is such: increase a microprocessor link (being called the interface microprocessor) between original dot matrix lcd module and external microprocessor, make the software interface of external microprocessor and interface microprocessor can accomplish unified.But this scheme has increased cost, therefore should not use in enormous quantities, and in addition, owing to be difficult to realize parallel interface between the existing microprocessor, therefore under needs mass data occasions for communication, this scheme is also improper.In a word, this scheme can solve the software interface unitarity problem of part dot matrix lcd module, but can't accomplish real unification, and has increased cost.
In addition, do not see in the existing various scheme comprehensive consideration design and emulation are arranged, normally design result to be downloaded in the dot matrix lcd module, just can check its effect in real system, this is more at displaying contents, display page concerns than under the complicated situation, and the degree that efficient improves is very limited.
Summary of the invention
Overall goal of the present invention is to improve the whole society development efficiency of dot matrix lcd module application software under the prerequisite that does not increase cost, for this reason, the present invention proposes a kind of general lattice LCD Controller device and applied software development system thereof, described general lattice LCD Controller device comprises microprocessor core, interface section and drive control part, the software function of described general lattice LCD Controller device is realized by the mask program; Described microprocessor core is electrically connected on mask program storage, video data random access memory, programmable read only memory and Chinese and English full word storehouse by external bus; Described interface section is connected in microprocessor core and installs between the outer microprocessor, is used to carry out data communication; Described drive control part is connected between microprocessor core, ranks drive unit and the external bus, be responsible for data in the video data random access memory are sent to the ranks drive unit by certain time sequence, drive control part and microprocessor core are by the shared external bus of mode of time-sharing multiplex.
Described interface section is made of data stack, command register, stack address counter and serial interface device, described data stack is made of random access memory (RAM) unit of several continuation addresses, and described serial interface device is identical to the mode of operation of the parallel interface of data storehouse and command register with microprocessor to the mode of operation of data storehouse and command register.
A kind of dot matrix lcd module of supporting the data preparatory function, be by matrix liquid-crystal display screen, the video data random access memory, general lattice LCD Controller device, the ranks drive unit, programmable read only memory and Chinese and English full word storehouse are formed, the hardware interface of microprocessor and this dot matrix lcd module is parallel or serial mode, the various information of the liquid crystal display page write in the programmable read only memory by general lattice LCD Controller device in advance, microprocessor only needs to the parameter that general lattice LCD Controller device sends seldom a large amount of video datas is stored in the video data random access memory, the data that are stored in the general lattice liquid crystal display data random access memory send to the ranks drive unit in an orderly manner by display control unit, make matrix liquid-crystal display screen demonstrate the figure of expection, image or literal, so that most of video data can be transmitted in inside modules, has significantly reduced the data traffic of external microprocessor and module.
A kind ofly be used to develop described a kind of applied software development system that supports the dot matrix lcd module of data preparatory function, described development system comprises:
One is used to carry out " the display page design/emulation module " of liquid crystal display page layout design and emulation;
One is used to realize hardware interface and connects computing machine and the download of user board/emulation interface card, and described download/emulation interface card comprises RS232 level converter and download/emulation interface device;
Described download/emulation interface device comprises: microprocessor core, interface section, mask program storage and UART Universal Asynchronous Receiver Transmitter; Described UART Universal Asynchronous Receiver Transmitter is connected with described RS232 level converter; Described interface section, mask program storage and UART Universal Asynchronous Receiver Transmitter are connected with microprocessor core, and microprocessor core is connected with the dot matrix lcd module with data initialization function of download/emulation interface card outside and is connected with user board by described interface section.
Remarkable result of the present invention is: the Liquid Crystal Module that 1) adapts to various dot matrix scales with a kind of general display control unit, thereby the interface of having unified dot matrix lcd module, this not only helps improving the whole society development efficiency of dot matrix lcd module application software, simultaneously do not increase cost yet, help use in enormous quantities; 2) support the data preparatory function, reduced the data traffic between external microprocessor and the dot matrix lcd module, be beneficial to and adopt serial line interface, enlarge the external microprocessor scope that is suitable for, simultaneously also make display page information have unified storage format, help adopting computer software to carry out Aided Design, further improve the development efficiency of dot matrix lcd module application software; 3) irrelevant with the dot matrix scale of liquid crystal, several peripherals of general lattice LCD Controller device all are optional, as: programmable read only memory, Chinese and English full word storehouse, in addition, the capacity of video data random access memory and programmable read only memory also is optionally, therefore can be fit to make the dot matrix lcd module of various functions and cost requirement; 4) only adopt a cover development system, just can simulate the dot matrix lcd module of all size substantially truly, and the cost of this system is not high.
It is generally acknowledged, increasing programmable read only memory and Chinese and English full word storehouse on LCD MODULE can increase the cost of LCD MODULE, but what deposit in programmable read only memory and the Chinese and English full word storehouse all is the former data that should be transmitted by external microprocessor, even these data do not exist on the LCD MODULE, also to be placed on the user board at external microprocessor place.Application system from LCD MODULE, adopt the solution of the present invention can not increase cost, on the contrary, because this scheme makes application system can select simpler external microprocessor for use, and reduce the area of user's control circuit board, thereby reduced the overall cost of application system.
Description of drawings
Fig. 1 is the inner structure and the external interface figure of traditional dot matrix lcd module.
Fig. 2 is the dot matrix lcd module with data initialization function, and it has adopted general lattice LCD Controller device of the present invention.
Fig. 3 is the inner structure and the external interface figure of general lattice LCD Controller device among Fig. 2.
Fig. 4 is the principle assumption diagram of interface section among Fig. 3.
Fig. 5 be among Fig. 3 drive control part and microprocessor core to the method synoptic diagram of data and address bus time-sharing multiplex.
Fig. 6 is the main program flow chart of mask program among Fig. 3.
Fig. 7 is the formation and the using method synoptic diagram of dot matrix lcd module applied software development system.
Fig. 8 is a dot matrix lcd module applied software development process flow diagram.
Fig. 9 is the inner structure and the external interface figure of download/emulation interface card among Fig. 7.
Embodiment
Fig. 2 has shown that a typical case of general lattice LCD Controller device uses.Dot matrix lcd module 21 with data initialization function is made up of matrix liquid-crystal display screen 211, video data random access memory 212, general lattice LCD Controller device 31, ranks drive unit 33, programmable read only memory 35 and Chinese and English full word storehouse 36.Microprocessor 32 is parallel or serial mode with the hardware interface of this dot matrix lcd module 21.The various information of the liquid crystal display page write in the programmable read only memory 35 in advance by display control unit 31, and 32 need of microprocessor just can make a large amount of video datas be stored in the video data random access memory 34 to the parameter that general lattice LCD Controller device 31 sends seldom.The data that are stored in the video data random access memory 34 send to ranks drive unit 33 in an orderly manner by general lattice LCD Controller device 31, make matrix liquid-crystal display screen 211 demonstrate figure, image or the literal of expection.As can be seen, the scheme that the structure of dot matrix lcd module adopts the utility model to provide can transmit most of video data in inside modules, thereby has significantly reduced the data traffic of external microprocessor and module.
As previously mentioned, the function of display control unit has played vital role when the function of decision LCD MODULE.Fig. 3 has shown the inner structure and the external interface figure of general lattice LCD Controller device.Structure internally, general lattice LCD Controller device 31 is not to be slapped together by microprocessor and existing lattice lcd display control unit simply, but adopts microprocessor core 311, increases interface section 312 and drive control part 313.The software function of display control unit 31 is realized by the program in the mask program storage 314.Interface section 312 is responsible for carrying out data communication with microprocessor 32, the data that it sends microprocessor 32 here are preserved the internal RAM address space that is mapped to microprocessor core 311 with the storehouse form, when the command code that microprocessor 32 sends was received in interface section 312, advising process 314 was done corresponding processing according to the data in the storehouse.For example when the command code of " character display " is received in interface section 312, program card 314 just reads the lattice information of character according to the coordinate parameters in the storehouse and character code in programmable read only memory 35 or the Chinese and English full word storehouse 36 and writes in the video data random access memory 34 by certain rule.Drive control part 313 is responsible for data in the video data random access memory 34 are sent to ranks drive unit 33 by certain time sequence.Drive control part 313 and the mode shared external bus of microprocessor core 311 by time-sharing multiplex so neither influence the normal operation of microprocessor core 311, also can realize the continuity that shows.
Below, introduce the embodiment of each several part in the general lattice LCD Controller device in detail.
Microprocessor core can be selected 8 or the microprocessor of 16 bit nuclear that has existed at present for use, also can be the microprocessor core of redesign, and the present invention adopts the nuclear with the MCS51 compatibility.
Fig. 4 has shown the principle assumption diagram of the interface section of general lattice LCD Controller device.Interface section 312 is made of data stack 411, command register 412, stack address counter 413 and serial interface device 414.Wherein, data stack 411 is made of random access memory (RAM) unit of several continuation addresses.The mode of operation of the parallel interface of 32 pairs of data storehouses 411 of the mode of operation of 414 pairs of data storehouses 411 of serial interface device and command register 412 and described microprocessor and command register 412 is identical.Have only when the value of command register 412 is FFh, data or order could be accepted in interface section 312.The initial value of stack address counter 413 is 0.When whenever writing a secondary data, external data is delivered to stack address counter 413 ram cell pointed, and subsequently, the value of stack address counter 413 increases one.During write order, data are delivered to command register 412 as command code, if this command code is not FFh, then block the read-write of data channel and the write signal of command channel, change the value of command register 412 into FFh up to microprocessor core 33.When whenever reading a secondary data, the value of stack address counter 413 subtracts one, and subsequently, microprocessor 32 obtains the value of stack address counter 413 ram cell pointed.During read states, microprocessor 32 obtains the value of command register 412.Whether microprocessor 32 at any time can read states, and be that FFh judges whether general lattice LCD Controller device is not busy according to this state.Because data channel adopts stack architecture, the interface section can receive and send the certain-length data of (as reaching 16 bytes or 32 bytes etc. at most) continuously, therefore can support the fast parallel operation of external data.
Another implementing method of storehouse is to adopt the structure of bidirectional shift register in the interface section.But under the bigger situation of stack depth, the required primary element number of circuit can substantially exceed the required primary element number of Fig. 4 structure.
Do not possess under the situation of preserving a screen video data at the ranks drive unit, in order to guarantee the continuity of liquid crystal display, the drive control part of general lattice LCD Controller device must be visited the video data random access memory continuously, if microprocessor core is not revised a little, then there is the problem of external bus conflict.This instructions with MCS51 nuclear be in the example explanation general lattice LCD Controller device microprocessor core and drive control part to the principle of external bus time-sharing multiplex.Fig. 5 has shown the method synoptic diagram of this time-sharing multiplex, and wherein P511 and P523 are clock signal of system.Shown in the first half of Fig. 5, a machine cycle P51 of MCS51 nuclear is divided into 6 state S1～S6, and which operation each state carries out can be referring to the books of introducing 51 Fundamentals of Mono-Chip Computers.Shown in the Lower Half of Fig. 5, a machine cycle P52 who revises back MCS51 nuclear is divided into 8 state S1～S8, and wherein S1～S6 is original six state P521, and under these six states, MCS51 nuclear is carried out original operation and occupied external bus; S7 and S8 are for two newly-increased state P522, and under these two states, MCS51 examines the state when only keeping S6, and release occupies external bus, and drive control part is carried out read operation to the video data random access memory.In addition, drive control part can be according to the line number of the automatic adjustment scanning of being provided with of outer pin and the figure place of each row.
Implement above scheme, the hardware capability of general lattice LCD Controller device just possesses, and can consider the realization of software interface function now.Fig. 6 is the main program flow chart of general lattice LCD Controller device mask program.Behind the hardware reset, program is execution in step S61 and S62 at first, just enter afterwards a loop body (this loop body comprises S63, S64, S65, S66, S67).Wherein, step S63 and S64 also are loop bodies, program is the querying command register ceaselessly, in case find command code be not FFh (at this moment, the read-write of interface section data channel and the write signal of command channel block automatically), execution in step S65 then, and call corresponding function (step S66) according to this command code.Performed function then leaves in the data stack in sequence, and the value of stack address counter is made as number of parameters if return parameters is arranged.Each function is finished, and then the value with command register changes FFh (step S67) into, open read-write, and then the circulation of execution in step S63 and S64.This shows, as long as write corresponding function, general lattice LCD Controller device can realize existing lattice lcd display control unit the function that can't realize.
Put it briefly, the technical characterictic of general lattice LCD Controller device is: adopt microprocessor core and mask program thereof realization software interface function and support programmable read only memory and Chinese and English full word storehouse; Realize the hardware interface function by the interface section, the data channel of interface section and command channel are separately, data channel adopts stack architecture, each unit of data stack, command register and stack address counter are mapped to the internal RAM space of microprocessor core, for the microprocessor core free access; When the value of command register is FFh, block the read-write of data channel and the write signal of command channel automatically; Drive control part and microprocessor core time-sharing multiplex external bus.
So far, this instructions finishes the embodiment introduction of general lattice LCD Controller device.Next introduce the implementation method of its applied software development system.
Fig. 7 is the formation and the using method synoptic diagram of dot matrix lcd module applied software development system.As shown in Figure 7, this system is made up of computing machine 71, display page design/emulation module 711 and download/emulation interface card 731.Connect with serial port between download/emulation interface card 731 and the computing machine 71.Whole performance history is divided into design and artificial debugging two states, and generally speaking, this two states is (as step S84 among Fig. 8 and the S85) that alternately exists.When finally not finishing, design result only is stored in the computing machine in design, and can connect user board 74 at any time and carry out emulation.When design is finally finished, can connect dot matrix lcd module 21 with data initialization function, download design result.The simulation software 712 and the display page design/emulation module 711 of microprocessor can move in same computing machine.
Fig. 8 is a dot matrix lcd module applied software development process flow diagram.The whole flow process of using this system to carry out the dot matrix lcd module applied software development is seen Fig. 8.Step S81, S82, S83 are the design preparatory stage; Step S84, S85, S86, S87 are the design cycle stage, and in this stage, the design of microprocessor software and emulation can hocket on LCD MODULE initialize data and the user's plate, and cycle period is fast, until reaching design object; Step S88, S89 are the design ending stage, carry out after design reaches target.Dot matrix lcd module through data initialization just has simple interface and complicated function.
How critical piece 73 (comprising display page design/emulation module 711 and download/emulation interface card 731) in this cover development system designs below.
The design of display page design/emulation module 711 does not have difficult especially place, and this instructions is only put forward some mentality of designing: the function of 1) describing microprocessor core in the general lattice LCD Controller device with higher level lanquage; 2) open up internal memory and serve as video data random access memory, Chinese and English full word storehouse and programmable read only memory; 3) show and adopt identical engine that promptly the process of visualization display is exactly the process of high-speed simulation during the visual and emulation in the design process.
Fig. 9 is the inner structure and the external interface figure of download/emulation interface card among Fig. 7.The inner structure of download/emulation interface card 731 and external interface, as shown in Figure 9, it mainly is made of download/emulation interface device 911 and RS232 level converter 912.The level conversion that RS232 level converter 912 is responsible between computing machine 71 and the download/emulation interface device 911 has ready-made product.And download/emulation interface device 911 do not have ready-made product, and it is revised a little by general lattice LCD Controller device.With 31 contrasts among 911 among Fig. 9 and Fig. 3, as can be seen, download/emulation interface device 911 has lacked drive control part 313 than general lattice LCD Controller device 31, increased UART Universal Asynchronous Receiver Transmitter 9113, other structure is constant, and just mask program storage 9114 is different with 314 content.Under simulation status, parameter and orders that mask program storage 9114 is responsible for user board 93 is sent are transmitted to computing machine, and the parameter that computing machine is returned and state be placed on interface section 312 respectively data stack and command register in.Under download state, the preset information that mask program storage 9114 is responsible for computing machine is sent writes in the dot matrix lcd module 21 with data initialization function.
In sum, in order under the prerequisite that does not increase cost, to improve the whole society development efficiency of dot matrix lcd module application software, the present invention proposes the practicable overall plan of a cover, it comprises a kind of general lattice LCD Controller device of data preparatory function and development system of application software thereof supported.
Claims (4)
1, a kind of general lattice LCD Controller device, it is characterized in that: described a kind of general lattice LCD Controller device comprises microprocessor core (311), interface section (312) and drive control part (313), the software function of described general lattice LCD Controller device (31) is realized by mask program storage (314); Described microprocessor core (311) is electrically connected on mask program storage (314), video data random access memory (34), programmable read only memory (35) and Chinese and English full word storehouse (36) by external bus; Described interface section (312) is connected in microprocessor core (311) and installs between the outer microprocessor (32), is used to carry out data communication; Described drive control part (313) is connected between microprocessor core (311), ranks drive unit (33) and the external bus, be responsible for data in the video data random access memory (34) are sent to ranks drive unit (33) by certain time sequence drive control part (313) and the mode shared external bus of microprocessor core (311) by time-sharing multiplex.
2, device according to claim 1, it is characterized in that: described interface section is made of data stack (411), command register (412), stack address counter (413) and serial interface device (414), each unit of described data stack (411) all is mapped to the internal RAM address space of microprocessor core, and described serial interface device (414) is identical to the mode of operation of the parallel interface of data storehouse (411) and command register (412) with microprocessor (32) to the mode of operation of data storehouse (411) and command register (412).
3, a kind of dot matrix lcd module of supporting the data preparatory function, it is characterized in that: describedly a kind ofly support that the dot matrix lcd module of data preparatory function is by matrix liquid-crystal display screen (211), video data random access memory (34), general lattice LCD Controller device (31), ranks drive unit (33), programmable read only memory (35) and Chinese and English full word storehouse (36) are formed, microprocessor (32) is parallel or serial mode with the hardware interface of this dot matrix lcd module (21), the various information of the liquid crystal display page write in the programmable read only memory (35) in advance by general lattice LCD Controller device (31), microprocessor (32) only needs to the parameter that general lattice LCD Controller device (31) sends seldom a large amount of video datas is stored in the video data random access memory (34), the data that are stored in the video data random access memory (34) send to ranks drive unit (33) in an orderly manner by general lattice LCD Controller device (31), so that matrix liquid-crystal display screen (211) demonstrates the figure of expection, image or literal;
Described general lattice LCD Controller device (31) comprises microprocessor core (311), interface section (312) and drive control part (313), the software function of described general lattice LCD Controller device (31) is realized by mask program storage (314); Described microprocessor core (311) is electrically connected on mask program storage (314), described video data random access memory (34), described programmable read only memory (35) and described Chinese and English full word storehouse (36) by external bus; Described interface section (312) is connected in microprocessor core (311) and installs between the outer described microprocessor (32), is used to carry out data communication; Described drive control part (313) is connected between microprocessor core (311), described ranks drive unit (33) and the external bus, be responsible for data in the described video data random access memory (34) are sent to described ranks drive unit (33) by certain time sequence described drive control part (313) and the mode shared external bus of described microprocessor core (311) by time-sharing multiplex;
Described interface section (312) is made of data stack (411), command register (412), stack address counter (413) and serial interface device (414), each unit of described data stack (411) all is mapped to the internal RAM address space of microprocessor core, and described serial interface device (414) is identical to the mode of operation of the parallel interface of data storehouse (411) and command register (412) with described microprocessor (32) to the mode of operation of data storehouse (411) and command register (412).
4, a kind ofly be used to develop the described a kind of applied software development system that supports the dot matrix lcd module of data preparatory function of claim 3, it is characterized in that described development system comprises:
One is used to carry out " the display page design/emulation module " of liquid crystal display page layout design and emulation;
One is used to realize hardware interface and connects computing machine and the download of user board/emulation interface card (731), and described download/emulation interface card (731) comprises RS232 level converter (912) and download/emulation interface device (911);
Described " display page design/emulation module " is connected by the interior RS232 level converter (912) of computing machine serial port and described download/emulation interface card (731);
Described download/emulation interface device (911) comprising: microprocessor core (311), interface section (312), mask program storage (9114) and UART Universal Asynchronous Receiver Transmitter (9113); Described UART Universal Asynchronous Receiver Transmitter (9113) is connected with described RS232 level converter (912); Described interface section (312), mask program storage (9114) and UART Universal Asynchronous Receiver Transmitter (9113) are connected with described microprocessor core (311), and microprocessor core (311) is connected and is connected with user board (93) by described interface section (312) with the dot matrix lcd module with data initialization function (21) of download/emulation interface card (731) outside.
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| CN109409083B (en) * | 2018-09-21 | 2021-04-13 | 中国科学院信息工程研究所 | Device for detecting return address tampering in stack |
| CN109147701B (en) * | 2018-09-21 | 2022-01-28 | 京东方科技集团股份有限公司 | Display control structure, display control method, display substrate and display device |
| CN109409086B (en) * | 2018-09-21 | 2021-04-13 | 中国科学院信息工程研究所 | Device for detecting falsified return address in stack based on newly added instruction |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6005537A (en) * | 1992-08-21 | 1999-12-21 | Hitachi, Ltd. | Liquid-crystal display control apparatus |
| CN2605635Y (en) * | 2002-09-30 | 2004-03-03 | 杭州士兰微电子股份有限公司 | General lattice liquid crystal display device and its application software developing system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6005537A (en) * | 1992-08-21 | 1999-12-21 | Hitachi, Ltd. | Liquid-crystal display control apparatus |
| US6259421B1 (en) * | 1992-08-21 | 2001-07-10 | Hitachi, Ltd. | Liquid-crystal display control apparatus |
| CN2605635Y (en) * | 2002-09-30 | 2004-03-03 | 杭州士兰微电子股份有限公司 | General lattice liquid crystal display device and its application software developing system |
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