GB2329742A - Liquid crystal display driving method and driver device - Google Patents
Liquid crystal display driving method and driver device Download PDFInfo
- Publication number
- GB2329742A GB2329742A GB9720657A GB9720657A GB2329742A GB 2329742 A GB2329742 A GB 2329742A GB 9720657 A GB9720657 A GB 9720657A GB 9720657 A GB9720657 A GB 9720657A GB 2329742 A GB2329742 A GB 2329742A
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- microcontroller
- driver
- data
- reading
- writing
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- 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
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/147—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using display panels
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
An LCD driving method and driver device, wherein the LCD driver is able to receive control signals from a microcontroller through a bit-writing terminal, a bit-reading terminal and a signal-selecting terminal. The microcontroller has a bi-directional connection to the LCD driver through a data-transmitting terminal. This terminal allows data to be read into the microcontroller and written from the microcontroller and can receive and identify the identification codes for four operation modes, preferably: a reading mode; a writing mode; a reading and modification before re-writing mode; and a command mode.
Description
AN IMPROVED LCD DRIVER DEVICE AND DRIVING
METHOD THEREOF
This invention relates to an improved LCD driver device and driving method thereof, and particularly to a device provided with a bi-directional transmission on the data terminal of the driver so as to furnish four (4) transmission modes including data writing, reading, reading and modification before writing in, and command, between a microcontroller and the driver.
In a conventional LCD driver as shown in FIG. 1, the driver comprises a pulse input terminal 1 1, a data input terminal 12, a load control terminal 13, and a selection control terminal 14. The data transmission method of the conventional LCD driver is shown in FIG. 2, in which the microcontroller "a" can load a transmission-starting signal via the selection control terminal of a selection control transmission line; simultaneously, the register of the microcontroller "a" is started to supply an input batch data each containing several bits; at the same time, a segment timing pulse is loaded therein; finally, the signals pass through the microcontroller "a", the load control terminal 13 of the load control line, and enter the driver to have the data latched. The operation flow chart thereof is shown in FIG. 3, in which a selection signal to start transmission is loaded in via the microcontrolller "a" for starting a register 31 in the microcontroller "a" so as to enable a multibatch data each containing several bits to be transferred, in serial mode, into driver 15, at the same time, the microcontroller is also loaded with a segment timing pulse signal 33, and finally the microcontroller sends in a load control signal to latch the input data 34, and then the driver will, by means of projection method, send the data to the LCD panel 35 continuously until the data being sent completely.
According to the aforesaid description, the conventional LCD driver and the operation method thereof has drawbacks as follows:
1. When batch data containing several bits is transferred, in serial mode, into the shift register of a microcontroller, and when one bit in that batch data has error, the whole batch data must be re-transmitted into the shift register; such process is deemed rather cumbersome.
2. When the driver reads data, the whole batch data containing serial bits must be transferred, in serial mode, from the shift register into the driver; the one-way input driver is unable to perform bi-directional transfer to enable the data to be read in the register for correcting error.
3. In the event of discovering an error data during the LCD panel receiving data, the data at a given point can not be replaced unless changing all the data completely.
4. Since the data terminal of the device is furnished with an input structure, the microcontroller can only provide simple function, i.e., being unable to furnish higher efficiency and multiple control function.
Slimming up the aforesaid description, it is apparent that the device and the driving method of the conventional LCD driver is unable to meet the current requirements, and it should be improved properly.
In view of the drawbacks as mentioned above, the inventor has carefully developed a concept and design to improve the same.
The prime object of the present invention to provide an input/output structure for a microcontroller on the data transmission terminal of a driver; such structure enables data to be transmitted, in bidirectioal mode, between the driver and the microcontroller; by means of devices such as bit-writing input, bit-reading input and bit-selecting input, the device can receive control signals of bit-writing, bit-reading and bit-selecting from the microcontroller so as to enable the data-transmitting terminal to receive and to identify the reading mode, the writing mode, the mode of reading and modification before re-writing, and command mode in order to augment the usage of the driver and to augment the functions of the microcontroller.
Another object of the present invention is to provide a data input /output structure between the register in the microcontroller and the memory in the driver in order to furnish a switching function for the reading mode, the writing mode, the mode of reading and modification before re-writing and command mode; in the event of having data error, the function between the register and the memory can be repaired quickly and immediately. By means of the command mode and the software thereof, the hardware will be enable to provide more functions.
The invention, as well as its many advantages, may be further understood by the following detailed description and drawings in which:
FIG. 1 is a block diagram of a conventional LCD driver.
FIG. 2 is a timing diagram of the conventional LCD driver.
FIG. 3 is an operation flow chart of the conventional LCD driver.
FIG. 4 is a block diagram of an embodiment according to an embodiment of the present invention, showing the improved LCD driver thereof.
FIG. 5 is a timing diagram of reading mode according to an embodiment of the present invention.
FIG. 6 is a timing diagram of writing mode according to an embodiment of the present invention.
FIG. 7 is a timing diagram in a mode of reading and modification before re-writing according to the present invention.
FIG. 8 is a timing diagram in command mode according to an embodiment of the present invention.
Referring to FIG. 4, it is a block diagram of an embodiment of the improved LCD driver according to the present invention, in which the datatransmitting terminal 41 is designed into an input/output device of the microcontroller, i.e., it is different from the conventional microcontroller, which can merely be used to send data into the driver; the bit-reading input terminal 42 is used for receiving a signal from the microcontroller to read the data in the driver memory; the bit-writing input terminal 43 is used for receiving a signal from the microcontroller to have a data written into the driver memory; the control-selecting input terminal 44 is used for receiving a selected signal from the microcontroller to start an identified mode. The data of the driver is to be sent, through the data output terminal, to the LCD panel.
FIG. 5 is a timing diagram of reading mode according to an embodiment of the present invention, which is an embodiment used for describing the data line, the bit-reading line, the bit-writing line and the bitselecting line connected with the microcontroller "b" and the driver so as to provide signal and data transmission between interfaces of the microcontroller and the driver; for example, the microcontroller "b" sends out a reading mode signal to the control-selecting input terminal 44; simultaneously, the bit-writing terminal 43, the data-transmitting terminal 41 and the bit-reading input terminal 42 will also receive signals from the microcontoller "b"; by means of the data-transmitting line and the datatransmitting terminal 41, the microcontroller "b" loads the driver with an identification code for a segment containing several bits; then, another segment containing several bits which is corresponding to a memory address in the driver is loaded in via the microcontroller in a regular sequence; finally, the memory of driver will read the corresponding address data backs to the microcontoller. After each batch data is read, one corresponding address of memory in the driver will be added to the number thereof automatically. The microcontroller can read a plurality of batches of data repeatedly until all batches of data being read completely, and then the bit-selecting signal will restore to an un-identified mode. The microcontroller "b" will, by means of read-in transmitting line and through the data-writing terminal 43, and starting from the identification code, load the driver with a segment read-in pulse corresponding to the address of memory in the driver;
During the period of reading the batch data in the driver, the writing bit is a static writing signal; during the period of the microcontroller loading in the identification code and the memory address of the driver, a static reading signal is loaded into the driver by means of the transmitting line and through the reading terminal 42. After the data in the driver memory are read by the microcontroller, a set of reading pulses will be received from the microcontroller, and such operation will continue until the batch data being read completely, and the bit-selecting signal becoming an un-identified mode.
The feature of such reading mode is that the data stored in the driver memory can be read, by means of projection method, back into the register of the microcontroller through bit-reading transmitting line so as to facilitate the microcontroller to use the same.
Referring to FIG. 6, it is a timing diagram for a writing-in mode of an embodiment according to the present invention, which is used to describe the signal and data transmission between the microcontroller "b" and the interface of the driver through the transmitting lines of data, bit-reading and bit-selecting and the four terminals of the driver. First, the microcontroller "b" send out a selecting signal of an identified mode for starting the writing mode; simultaneously, the bit input terminal 43, the data-transmitting terminal 41 and the bit-reading input terminal 42 will also receive signals from the microcontroller "b"; the microcontroller "b" will load the driver with an identification code for a segment containing several bits through the data transmitting line and the data-transmitting terminal 41, and then again load another segment containing several bits corresponding to a memory address in the driver, and so on in a regular sequence; then, the microcontroller will, in accordance with the corresponding address of the driver memory, write the data into the driver memory; after each batch data is read in completely, the number of the corresponding address in the driver will be added with one. The microcontroller can write in a plurality of batch data repeatedly until all batches of data being written in completely, and then the bit-selecting signal will restore to an un-identified mode signal immediately. During writing mode operation, the microcontroller will continuously load writing pulse signal into the driver until all batches of data being written in completely and the bit-selecting signal becoming an unidentified mode; simultaneously, the microcontroller "b" will send out a reading bit as a static reading signal. The feature of such writing mode is that, through the bit-writing transmitting line, the data of the microcontroller will be written into the driver memory to facilitate the usage of the driver memory.
FIG. 7 is a timing diagram in a mode of reading and modification before re-writing according to the present invention; by means of the transmitting lines of data, bit-reading, bit-writing and bit-selecting, the microcontroller "b" provides signal and data transmission between the interfaces of the driver through the four terminal of the driver first, the microcontroller "b" sends out a selected signal of identified mode for starting the reading and modification before re-writing mode; simultaneously, the bit-writing input terminal 43, the data-transmitting terminal 41 and the bit-reading input terminal 42 will receive signals from the microcontroller "b"; the microcontroller "b" loads the driver with an identification code for a segment containing several bits by means of the data-transmitting line and through the data-transmitting terminal 41; then, another segment containing several bits corresponding to the memory address in the driver is loaded, and they are sent into the driver memory from the microcontroller in a regular sequence; after each batch data being mapped into the microcontroller for reading and modification before re-writing into the driver memory, the number of the corresponding memory address will be added with one (1); the microcontroller will process a plurality of batch data repeatedly until all batches of data being processed completely, and then the selected bit will be restarted to an un-identified mode signed. During that period, the microcontroller sends out, started from the identification code, a segment pulse signal for a given period to the corresponding memory address in the driver. During the period of the microcontroller to read data, the writing-in bit is a static writing signal. During the period of microcontroller modifying and re-writing into the driver memory, the microcontroller will load the driver with a set of writing pulse signal. During the modification process for batch, data, the driver will repeatedly receive a set of writing pulse signal and a section of static writing signal in alternate manner. During the period of the microcontroller loading an identification code into the memory address of the driver, a static writing signal is sent in until the data in the driver memory being read by the microcontroller; then, the bit-reading terminal 42 will, through the bit-reading transmitting line, receive a set of reading pulse signals; during the period of modification and re-writing into the driver memory, it will receive a static reading signal from the microcontroller; the reading bit during modification process for batch data, it will receive a section of static reading signal and a set of reading pulse signal alternately.
The feature of reading and modification before re-writing mode is that it is a process by reading data back into the microcontroller for modification before sending back to the driver, and such process can provide a flexible modification to data at a signal point on the LCD panel.
FIG. 8 is a timing diagram in command mode according to an embodiment of the present invention; the microcontroller "b" provides signal and data transmission between the interfaces of the driver by means of the transmitting lines of data, bit-reading, bit-writing and bit-selecting and through the four terminals of the driver. First, the microcontroller "b" sends out an identified selecting signal for starting the command mode; simultaneously, the bit-writing input terminal 43, the data-transmitting terminal 41 and the bit-reading input terminal 42 will also receives signals from the microcontroller "b"; by means of the data-transmitting line and through the data-transmitting terminal 41, the microcontroller "b" will load the driver with an identification code for a segment containing several bits, and then the microcontroller will load the driver with several command codes continuously until the batch command codes being sent out completely; then, the bit-selecting signal will restore to un-identified mode. During the period of command mode operation, the microcontroller sends out a set of writing pulse signal and a section of static reading signal. The feature of such command mode is that the usefulness of the driver can be increased, and more software facilities and additional functions can be obtained; further, it can provide optional operation for an outer frequency or a quartz oscillator so as to provide a user with more uses.
The aforesaid description is merely used for a preferred embodiment of the present invention; any modification thereof is deemed under the spirit and scope of the claims as claimed in the present invention.
Claims (6)
1. An improved driving method for LCD driver, in which a plurality of data can be transmitted in bi-directional way between a microcontroller and a driver;
said microcontroller transmitting into said driver with control signals such as a bit-selecting signal, a bit-reading signal, and a bit-selecting signal so as to enable a data-transmitting terminal to accept a plurality of transmitting modes, such as reading mode, writing mode, a mode of reading and modification before re-writing, and a command mode, by means of switching mode.
2. An improved driving method for LCD driver as claimed in claim 1, wherein said reading mode including:
(a) said microcontroller sending to said driver with a section of identification signal to start a reading mode until said reading being completed;
(b) said microcontroller simultaneously loading said driver with an identification code for a segment containing several bits, and then another segment containing several bits for corresponding memory address in said driver, and said microcontroller continuously sending the same into said driver; finally said driver memory sending said corresponding address data back to said microcontroller; after each data being read completely, number of addresses in said corresponding memory in said driver being added with one (1), and a plurality of data being read continuously until all batches of data being finished;
(c) during a period of said microcontroller sending corresponding address into said driver memory started from an identification code, said microcontroller also sending out a set of reading pulse signal, which being a static writing signal during reading operation period;
(d) said microcontroller sending in a static reading signal during a period of writing operation, and as soon as said microcontroller starting to read a data from said driver memory, a set of reading pulse signal being sent in, and continuing to do so until a whole batch data being read completely.
3. An improved driving method for LCD driver as claimed in claim 1, wherein said writing mode including:
(a) said microcontroller transmitting a section of identified mode selecting signal for a starting mode until said section being read completely;
(b) said microcontroller loading said driver with an identification code of a segment containing several bits, and then loading another segment containing several bits corresponding to memory address in said drive in a regular sequence; finally, said microcontroller writing all corresponding addresses of said driver memory into a memory in a regular sequence, after each batch data being read, number of said corresponding addresses of said memory in said driver being added with one (1); a plurality of batch data to be written in until all said batch data being done completely;
(c) during a period of said microcontroller from starting a writing mode to a batch data being written completely, a writing pulse signal being maintained in input state;
(d) during a period of said microcontroller from start a writing mode to said writing mode completed, a static reading signal being maintained through.
4. An improved driving method for LCD driver as claimed in claim 1, wherein said reading and modification before re-writing mode including:
(a) said microcontroller transmitting into said drive with a section of identification code signal of a starting mode;
(b) simultaneously said microcontroller also loading said driver with an identification code for a segment containing several bits, and said microcontroller loading said driver with another segment containing several bits corresponding to address of memory in said driver in a regular sequence; then, said driver memory reading said corresponding address data back into said micorcontroller, and then said microcontroller modifying said the same, and then writing said data into said driver memory in corresponding address therein in a regular sequence; after each data being read and modified before re-writing into said driver memory through said microcontroller, number of corresponding address in said driver being added with one (1); a plurality of data being processed repeatedly until all data being done completely, and then said bits selected being restored into an an-identified mode signal;
(c) said microcontroller sending a set of identification code to start loading said corresponding memory address in said driver; a segment pulse signal during loading period, and during a period of reading with said microcontroller, written bit being a static writing signal; after said microcontroller modifying the same and then re-writing the same into said driver memory, and during said period, said microcontroller loading said driver with a set of writing pulse signal; said bits written following a modification process for batch data, and said driver to receive alternately a set of writing pulse signal and a section of static writing signal;
(d) during period of said microcontroller loading an identification code and said address in said driver memory, a static reading signal being send out continuously until data in said drive memory being read back, and then a set of reading pulse signal being sent out; during period of modification and rewriting, said drive receiving a static reading signal from said microcontroller; bits written following a modification process for batch data, and said driver to receive alternatively a section of static reading signal and a set of reading pulse signal.
5. An improved driving method for LCD driver as claimed in claim 2, wherein said command mode including:
(a) said microcontroller sending into said driver with a section of selecting signal of identification mode for starting said command mode;
(b) said microcontroller loading simultaneously said drive with a section of identification code containing several bits, and then several batches of command code, from said microcontroller being loaded therein until a whole batch of command codes being loaded completely, and then said selecting signal restoring into a selecting signal of an un-identified mode;
(c) during a period of said command mode operation, said microcontroller sending a set of writing pulse signal therein;
(d) during a period of said command mode operation, said microcontroller sending a section a static reading signal therein.
6. An improved LCD driver device, which is a transmission structure between a driver and a microcontroller, and said device comprising:
a data-transmitting terminal which is an input/output device to provide a bi-directional transmission of data between said drive and said microcontroller;
a bit-reading terminal for receiving a reading signal from said microncontroller so as to read data in said driver;
a bit-writing input terminal for receiving a writing signal from said microcontroller so as to write data into said driver;
a control-selecting input terminal for receiving a selecting signal of an identified code from said microcontroller for a starting mode; and
a data output terminal for transmitting a data from one terminal of said drive and through a transmission line of drive data and then to a LCD panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9720657A GB2329742A (en) | 1997-09-29 | 1997-09-29 | Liquid crystal display driving method and driver device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9720657A GB2329742A (en) | 1997-09-29 | 1997-09-29 | Liquid crystal display driving method and driver device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9720657D0 GB9720657D0 (en) | 1997-11-26 |
| GB2329742A true GB2329742A (en) | 1999-03-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9720657A Withdrawn GB2329742A (en) | 1997-09-29 | 1997-09-29 | Liquid crystal display driving method and driver device |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2329742A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0529933A2 (en) * | 1991-08-23 | 1993-03-03 | Motorola, Inc. | Data stream altering system, for example in a LCD driver |
-
1997
- 1997-09-29 GB GB9720657A patent/GB2329742A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0529933A2 (en) * | 1991-08-23 | 1993-03-03 | Motorola, Inc. | Data stream altering system, for example in a LCD driver |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9720657D0 (en) | 1997-11-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |