CN1324552C - Method and device for enhancing multi-function selection of liquid crystal display driver - Google Patents

Abstract

A method and device for intensifying multifunction selection of LCD driver includes transmitting decode signal or command code by time control system, receiving decode signal and command code by command decoder, decoding said command code to be normal mode and test mode, receiving decode data by RAM, receiving display frequency of time control system and data mapped by RAM by LCD driver to let LCD driver have any action of selecting display data, buzzing and interrupting request signal or test to let data of RAM be mapped to panel and to be suitable for LCD display piece with different level for intensifying multifunction selection function.

Description

Method and device for enhancing multi-function selection of liquid crystal display driver

technical field

The invention relates to a method and device for enhancing multi-function selection of a liquid crystal display driver, in particular to an enhanced multi-function liquid crystal display driver capable of using the structure of a time control system to achieve more selectable effects by using command mode control Method and device for function selection.

Background technique

For a traditional liquid crystal display driver, please refer to FIG. 1, which is a schematic block diagram of a traditional liquid crystal display driver device. First, the digit 110 of the input data, the selection control signal 111, and the timing pulse 112 are synchronously input to the outside world (ie, the user). The shift register 10 of the microcontroller, and the shift register 10 of the microcontroller, shifts the multi-bit data stored in it into the driver in a serial manner, and then transmits it to the driver by the microcontroller for loading The control signal 113 latches the multi-bit data in the driver 11, and then sends the latched data to the level shifter 12 of the drive circuit, and the display frequency input signal 114 controls the level shifter 12, and a fixed bias voltage 116 is provided from the outside And the enable signal 115 is sent to the port of the level driving circuit, so that the level driving circuit drives the data to the liquid crystal display panel 14 to display the data.

Please refer to Fig. 2, which is a working flow diagram of a traditional liquid crystal display driver. At first, the shift register is started in step 21, and then the interface a of the microcontroller and the driver is input to the driver by the microcontroller in step 22. Multi-bit data, then in step 23, the data is latched by the load control signal, and in step 24, the data and display frequency are controlled by the level shifter, and in step 25, the bias voltage is provided and the drive is enabled in cooperation with the outside world The circuit drives the data to the panel, step 26, the panel can display the data at this time, until the display of the entire data in step 27 is completed.

From the above-mentioned traditional liquid crystal display driver, it is known that it has the following disadvantages:

1. A certain piece of data, including multi-bit data, is serially input into the shift register (Shift register) of the microcontroller. However, when an error occurs in any one of the digits contained in any piece of data, Then the entire data must be re-entered into the shift register (Shift register). These procedures are quite cumbersome and time-consuming.

2. When the driver reads data, it must serialize the entire data containing multiple bits and then move it out of the shift register one by one to the driver. However, the data input to the driver in one direction cannot be bidirectionally encountered, so Inability to read data back to the microcontroller's scratchpad to correct erroneous data.

3. When the liquid crystal display panel receives data and finds that there is an error in the data, it is impossible to modify the data of a single point immediately, but must re-update all the data.

4. Since the data terminal in the device only has an input structure, the microcontroller has simple functions and cannot perform high-efficiency and multi-functional control functions.

Based on the above, it shows that the traditional liquid crystal display driver does not meet the actual needs of modern times and needs to be improved.

Therefore, the present inventors devoted themselves to the above-mentioned shortcomings and proposed a method and device for enhancing multi-function selection of a liquid crystal display driver with a reasonable design concept and effectively improving the above-mentioned shortcomings.

Contents of the invention

The main purpose of the present invention is to provide a method and device with multi-function selection, the method and device can map random access memory data to the drive circuit under the operation of the command mode, and then drive the data to the drive circuit by means of the circuit. The panel displays, and at the same time, the control system and random access memory can be used for data bidirectional switching functions such as read mode, write mode, and modified and written mode after reading.

In order to achieve the above object, the present invention provides a method for enhancing multi-function selection of a liquid crystal display driver, which is characterized in that the decoding signal or command code is transmitted by the time control system, and the decoding signal and command transmitted by the time control system are accepted by the command decoder code, and decode the command code into normal mode and test mode, the random access memory accepts the decoded data from the command decoder, and the LCD driver accepts the display frequency of the time control system and the mapped data from the random access memory Data, so that the liquid crystal display driver has any action of selecting display data, buzzing, interrupt request signal or test.

The present invention also provides a device for enhancing multi-function selection of a liquid crystal display driver, which is composed of a time control system and a liquid crystal display drive circuit, wherein the device for strengthening multi-function selection of a liquid crystal display driver also includes:

The command decoder receives the decoding signal and command code transmitted by the time control system, and decodes the command code into normal mode and test mode;

Random access memory, which can accept the decoded data from the instruction decoder;

The liquid crystal display driving circuit receives the display frequency of the time control system and the data mapped by the random access memory, so that the data is output to the liquid crystal display panel.

As mentioned above, the liquid crystal display driver enhances the multi-function selection device, wherein the time control system includes:

Built-in oscillator, self-generated oscillation frequency signal;

External oscillator, the oscillation frequency signal is input from the outside;

A multi-tasking switcher is electrically connected to the built-in oscillator and the external oscillator, and one signal can be selected;

A frequency divider, electrically connected to the multiplexer to provide a programmable control frequency;

Buzzer, the frequency divider provides a programmable frequency signal to make it buzz;

The interrupt request system, the frequency divider provides a programmable control frequency signal, and the timer or supervisory timer overflows to generate an interrupt request signal;

The input signal system accepts reading digital signals, writing digital signals, selecting digital signals and data.

The beneficial effect of the present invention is that, by using the structure of the time control system, and by means of the operation in the command mode, the operation steps such as testing, buzzing or interrupting can be efficiently selected.

Simultaneously, when the system is suspended, the present invention stops the operation of the oscillator to implement the sleep state, which can achieve the effect of power saving.

In order to have a further understanding and recognition of the purpose, features and effects of the present invention, the detailed description is as follows with reference to the accompanying drawings.

Description of drawings

FIG. 1 is a schematic block diagram of a conventional liquid crystal display driver device;

Fig. 2 is a working flow diagram of a traditional liquid crystal display driver;

3 is a block diagram of an enhanced multi-function selection device of a liquid crystal display driver according to an embodiment of the present invention;

4 is a schematic block diagram of a time control system according to an embodiment of the present invention;

5 is an action flow chart of the enhanced multi-function selection of the liquid crystal display driver according to the embodiment of the present invention;

Label description:

1 input system 2 control system

3 The transmission end of the external oscillator 10 Shift register

11 Latch multi-bit data 12 Level shifter

13 level driving circuit 14 LCD display panel

110 data digits 111 selection control signal

112 timing pulse 113 loading control signal

114 display frequency signal 115 enable signal

116 Fixed bias 21 Start shift register

22 Input multi-bit data 23 Latch multi-bit data

24 level shifter 25 drive data to the panel

26 The driver panel displays the data 27 The entire data display is completed

31 time control system 32 instruction decoder

33 random access memory 34 liquid crystal display drive circuit

35 liquid crystal display panel 411 built-in oscillator

412 quartz oscillator or external oscillator 413 multi-tasking switcher

414 built-in frequency divider 425 AND gate

426 buzzer input terminal 417 programmable frequency signal

415 enabler 416 buzzer output

419 timer 420 supervisory timer

422 or gate 424 interrupt request signal output

51 Start the power supply 52 Control signal and data input

53 time control system transmission signal or data 54 input frequency

55 self-generated frequency signal 531 decoding command

532 Whether the decoding is completed 533 Normal mode

534 writes to random access memory

535 frequency divider provides programmable controllable frequency signal

536 data mapping

The 537 receives programmable bias and flex cycle data

538 panel displays its data 541 beep

542 timer or supervisory timer overflow 543 interrupt request signal generation

550 modified after reading and then writing mode operation

551 outputs the data from the random access memory

552 test mode

553 frequency divider stops programmable control frequency signal

554 buzzer input frequency signal 555 display frequency output

556 test segment display area and common pole part of liquid crystal display panel

557 end of work

560 read mode operation 561 write mode operation

a The interface between the microcontroller and the driver

Detailed ways

Please refer to FIG. 3 , which is a circuit block diagram of an embodiment of the present invention, which is a schematic block diagram of a liquid crystal display driver strengthening multi-function selection device as a whole, and the input end of the time control system 31 of the multi-function selection device has a Read digital terminal, write digital terminal, select digital terminal and data transmission terminal, together with a pair of transmission terminals required by the oscillation system inside the time control system, constitute a set of input system 1, as shown by the dotted line. The time control system 31 receives signals such as reading digits, writing digits, selecting digits, and frequency, and data is also loaded into the time control system at the same time. The time control system 31 has multiple output paths, wherein the command code (COMMAND CODE) and the decoded signal are synchronously output to the command decoder 32 for decoding, and the decoded data obtained are normal mode and test mode command signals, wherein the normal mode data Write random access memory RAM, label 33, make it can utilize random access memory RAM33 to liquid crystal display drive circuit 34 to do the operation of two-way data mapping under normal mode control, time control system 31 also is to random access memory RAM33 simultaneously The data is used for reading mode, writing mode, and the mode of modifying and writing after reading, etc. for two-way switching work. In addition, the time control system 31 outputs the display frequency signal to the liquid crystal display drive circuit 34 under the control of the test mode. , then the drive circuit 34 can adapt to different liquid crystal display applications and timely modify the single point number of the display panel and then output it to the liquid crystal by virtue of the programmable control bias it receives and the flexibility planned by the program. The display panel 35 displays the data of its segmented display area and the common pole, while another group of input and input system 2 of the time control system, as shown by the dotted line, under normal mode control, the frequency divider provides a programmable frequency signal , give the timer or supervisory timer to generate an interrupt request signal output when it overflows.

For the structural description of the time control system, please refer to FIG. 4, which is a structural diagram of the time control system of the embodiment of the present invention, wherein the frequency signal is input from the transmission terminal 3 of the external oscillator required by the external oscillator or quartz oscillator 412 Or the oscillation frequency signal generated by the built-in oscillator 411 of the time control system, through a multiplexer 413, selects one of the frequency signals, and then sends it to the built-in frequency divider (frequency divider) 414. In the mode, a programmable frequency 417 is provided, which can enter the enabler 415 in the buzzer system and its external power supply V _DD , and then use its buzzer output terminal 416 to generate a buzzer sound, or provide a programmable controllable Frequency 417, entering the interrupt requires the enabler 418 in the system, and when inputting the timer 419, the old data or signals stored in the timer must be cleared before the frequency signal can be input: similarly, when the frequency signal of the supervisory timer 420 is input , the old data or signals stored in the supervisory timer must be cleared before the frequency signal can be input. With the help of their overflow action, the multiplexer 421 selects a frequency signal input enabler 423, and then cooperates with the supervisory timer. The timer enable signal and the timer enable signal are synchronously input at both ends of the OR gate (OR GATE) 422, and then its OR gate (OR GATE) 422 generates an output end enable trigger signal, so that the time control system is required to interrupt the output end 424 , to generate an interrupt request signal. In addition, the built-in frequency divider 414, in the test mode, outputs a low-level signal to the AND gate (AND GATE) 425, and the buzzer input terminal 426 does not input any frequency signal, then the AND gate (AND GAIE) 425 output terminal does not show frequency signal output, then promptly provide the frequency signal of programmable control to the buzzer system or interrupt request system at this moment; If frequency divider 414 outputs the signal of high level to AND gate (AND GAIE) 425, and The frequency signal is input from the buzzer input terminal 426, and the display frequency signal is output from the output terminal of the AND gate (AND GATE) 425 to the liquid crystal display driving circuit.

Please refer to Fig. 5, Fig. 5 is the working process flowchart of the embodiment of the present invention, at first, in step 51, start power supply, then in step 52, control signal and data are input to drive device of the present invention by microcontroller In, and in step 54, by external input frequency signal, or in step 55 by built-in self-generated frequency signal 55 in time control system, after the time control system of drive device of the present invention receives, in step 53, this time The control system can transmit signals or data, wherein in step 531, the command signal is decoded via the command decoder, and then in step 532 it is judged whether the decoding is completed, if not, the decoding is performed again, according to the decoding information, the time control system and the The random access memory can be operated in the write mode in step 561, in the read mode in step 560, and in step 550 after being read and then modified and rewritten. Then in step 551, the data in the random access memory is changed by time The control system outputs to the operating system in test mode or normal mode (step 53). As shown in step 552, it is selected to operate in the test mode. In step 553, the frequency divider stops supplying the programmable frequency signal. Then in step 554, the frequency signal is input from the buzzer terminal, and then output in step 555. Display frequency, make it can in step 556, test segmented display area and common pole part of liquid crystal display panel, until end of operation in step 557, if select normal mode in step 533, then in step, the present embodiment The device writes the decoded data into the random access memory, and then in step 536, maps the data to the drive circuit, in step 555, the drive circuit receives the display frequency output by the time controller and in step 537, the drive circuit receives the Programmable bias voltage and elastic cycle data, then in step 538, the liquid crystal panel can display the corrected data and display data, until in step 557, the operation ends, the normal mode 533 can also be provided by the frequency divider programmable control Frequency signal 535, make it can in 541, select buzzer system to generate buzzer sound or in step 542, make timer or supervisory timer overflow, in step 543, generate interrupt request signal, until step 557, run At the end, if the system suspends the operation, the built-in oscillator or the external oscillator will stop working, and the state of sleep will be implemented to achieve the effect of power saving.

To sum up, it should be understood that the present invention can provide industrial utilization and is progressive, and the present invention has not been seen in any publications, and it should comply with the provisions of Article 22 of the Patent Law.

The above are only descriptions of preferred embodiments of the present invention, and all other variations should still fall within the spirit of the present invention and the scope defined by the appended claims.

Claims (7)

1. the method selected of a LCD driver enhancing multi-functional, it is characterized in that, by time controlled system transmission decoded signal or command code, accept decoded signal and the command code that time controlled system transmits by instruction decoder, and this command code is decoded as normal mode and test pattern, random access memory is accepted the decoded data that instruction decoder transmits, described LCD driver is accepted the display frequency and the random access memory institute mapped data of time controlled system, makes LCD driver have the selection video data, buzzing, each action of interrupt request signal or test.

2. the method that LCD driver enhancing multi-functional as claimed in claim 1 is selected is characterized in that, the step of carrying out test is:

A is by outside input frequency signal or produce frequency signal and control signal and data sync voluntarily and input to time controlled system;

B time controlled system transmission signals or data;

C time controlled system and random access memory are writing pattern, read mode or are reading back modified writing again under the pattern operation, access data and time control system synchronous transmission command code and decoded signal entry instruction demoder are so that instruction decoder is decoded;

D judges whether to decode and finishes;

If e then feedback decoding data to time controlled system carries out test pattern, then continue decoding if not;

The f frequency divider stops to provide the frequency signal of control able to programme;

G buzzing end input frequency signal;

The h display frequency is transported to driving circuit by time controlled system;

The segmentation viewing area of i test fluid LCD panel and copolar point part;

J work is finished.

3. the method that LCD driver enhancing multi-functional as claimed in claim 1 is selected is characterized in that, the step of carrying out video data is:

A is by outside input frequency signal or produce frequency signal and control signal and data sync voluntarily and input to time controlled system;

B time controlled system transmission signals or data;

C time controlled system and random access memory are writing pattern, read mode or are reading back modified writing again under the pattern operation, access data and time control system synchronous transmission command code and decoded signal entry instruction demoder are so that demoder is decoded;

D judges whether to decode and finishes;

If e then feedback decoding data to time controlled system carries out the normal mode operation, then continue the decoding action if not;

F writes random access memory;

G will deposit the data map of random access memory in to driving circuit;

H by time controlled system in test pattern output frequency to driving circuit;

The i driving circuit will be accepted the bias voltage and the elasticity cycle data of control able to programme, and data or the data revised are transported to display panels;

The j display panels shows its data;

K is up to end of run.

4. the method that LCD driver enhancing multi-functional as claimed in claim 1 is selected is characterized in that, the step of carrying out buzzing is:

A is by outside input frequency signal or produce frequency signal voluntarily and control signal and data sync control system input time;

B time controlled system transmission signals or data;

C time controlled system and random access memory are writing pattern, read mode or are reading back modified writing again under the pattern operation, access data and time control system synchronous transmission command code and decoded signal entry instruction demoder are so that this instruction decoder decoding;

D judges whether to decode and finishes;

If e then feedback decoding data to time controlled system carries out the normal mode operation, then continue the decoding action if not;

The f frequency divider provides the frequency signal of control able to programme;

G then produces buzzer;

The h operation is finished.

5. the method that LCD driver enhancing multi-functional as claimed in claim 1 is selected is characterized in that, the step of carrying out the look-at-me requirement is:

A is by outside input frequency signal or produce frequency signal and control signal and data sync voluntarily and input to time controlled system;

B time controlled system transmission signals or data;

C time controlled system and random access memory are writing pattern, read mode or are reading that the back is modified to write under the pattern operation access data and time control system synchronous transmission command code and decoded signal entry instruction decoder decode again;

D judges whether to decode and finishes;

If e then feedback decoding data to time controlled system carries out the normal mode operation, then continue the decoding action if not;

The f frequency divider provides the frequency signal of control able to programme;

G timer or supervision timer overflow;

The h interrupt request signal produces;

The I end of run.

6. the device that the LCD driver enhancing multi-functional is selected is made up of time controlled system and liquid crystal display drive circuit, it is characterized in that, the device that this LCD driver enhancing multi-functional is selected also comprises:

Instruction decoder is accepted decoded signal and command code that time controlled system transmits, and this command code is decoded as normal mode and test pattern;

Random access memory can be accepted the decoded data that instruction decoder transmits;

Described liquid crystal display drive circuit is accepted the display frequency and the random access memory institute mapped data of time controlled system, so that data export display panels to.

7. the device that LCD driver enhancing multi-functional as claimed in claim 6 is selected is characterized in that this time controlled system comprises:

Built-in oscillator produces oscillation frequency signal voluntarily;

External oscillator is by outside input oscillation frequency signal;

Multiplex's switch is electrically connected to this built-in oscillator and this external oscillator, the signal of can choosing any one kind of them;

Frequency divider is electrically connected the frequency that this multiplex's switch provides control able to programme;

Hummer provides the frequency signal of control able to programme by this frequency divider, makes it produce buzzing;

The interrupt request system provides the frequency signal of control able to programme by this frequency divider, through timer or supervision timer overflow, makes it produce interrupt request signal;

The input signal system accepts to read the numerical digit signal, writes the numerical digit signal, selects numerical digit signal and data.

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