KR0151094B1 - Integrated circuit to control character blanking in the liquid crystal display device - Google Patents

Abstract

The present invention relates to an LCD control integrated circuit having various types of character flickering functions.

DDRAM: Command control unit for controlling the setting command of the DDRAM and the flashing setting command of the DDRAM: Address and scan counter for periodically reading DDRAM data by receiving the signal output from the command control unit :, The DDRAM A latch for storing data output from: A character generator for receiving an output signal corresponding to a display character output from the latch and a line signal specifying a line of one character, and selecting and outputting a font of the character to be displayed: Receiving the signal output from the character generation ROM, the signal specifying the black (BK) and inverting (IV) flickering outputs from the latch, and the signal (BLLINK_TIMEL) selecting the cycle of the blinking; Performs data conversion for flickering according to the status of BK and IV on the signal output from the generator ROM and displays it on the LCD panel. Ray includes a DDRAM blink control that outputs the final font signal.

Therefore, as described above, the present invention has the effect of implementing various kinds of flickering functions to be emphasized in the display for all characters of the LCD.

Description

Integrated circuit to control flicker of liquid crystal characters

1A is an illustration of an LCD display with a blink function according to the present invention.

1B is a diagram showing an example of the form of flicker according to the present invention.

Figure 1c is a diagram showing the flicker operated by the function table according to the present invention.

2A is a table showing a command for setting a DDRAM address.

Figure 2b is a table showing the DDRAM blink setting command.

Figure 2c is a table showing the functional table of the DDRAM flicker.

3 is a configuration block diagram for performing a blink function according to the present invention.

4 is a detailed view of the DDRAM of FIG.

FIG. 5 is a detailed view of the flicker control unit of the DDRAM of FIG.

The present invention relates to an LCD control integrated circuit, and more particularly, to an LCD control integrated circuit having various types of character flickering function.

The LCD control integrated circuit displays a total of 80 characters. The basic operation is to record the address of the character to be displayed in the DDRAM (Display Data RAM), and the scan counter periodically scans the DDRAM to generate the character. Generates fonts that correspond to the characters stored in (CGROM; Character Generation ROM) and displays them on the LCD panel.

The blink function of the conventional LCD control integrated circuit is performed only at the cursor position indicating the current position among the 80 character areas.

For example, if you write three letters of ABC one by one, the cursor is located at the fourth digit, and if you execute the command to operate blinking, it will blink periodically only at the position where the cursor is located.

That is, the conventional integrated circuit has the disadvantage of performing a black flickering function in only one character among the 80 displayed characters, so that if two or more characters are desired to be emphasized on the LCD screen, both characters are emphasized. There is a disadvantage that can not display.

The present invention was created to solve the above-mentioned problem, and for each of the 80 characters displayed, three types of flashes, such as black blink, blink, and white blink, respectively, are displayed. By providing a blink function independently, it is possible to provide an LCD control integrated circuit that can display a variety of displays by selecting a plurality of character strings such as several characters or words to be emphasized among the 80 displayed characters. For that purpose.

According to an embodiment of the present invention, an integrated circuit for controlling flicker of a liquid crystal character may include: a DDRAM having flicker data for each address; A command controller for controlling the setting command of the DDRAM and the flashing setting command of the DDRAM; An address and scan counter unit for receiving the signal output from the command control unit and periodically reading DDRAM data having a property of blinking; A latch for storing data output from the DDRAM; A character generation ROM that receives an output signal corresponding to the display character output from the latch and a line signal specifying each line of one character, and selects and outputs a font of the character to be displayed; Character generation by receiving a signal output from the character generation ROM, a signal specifying the attribute of black (BK) and inverted (IV) blinking output from the latch, and a signal (BLINK_TIMEL) selecting a cycle of blinking It is characterized in that it comprises a DDRAM flicker control unit for outputting the final font signal displayed on the LCD panel by performing a data conversion for flicker corresponding to the state of the BK and 1V signal output from the ROM.

In the integrated circuit for controlling the flicker of the liquid crystal character according to the present invention, DDRAM is characterized by adding bits for black flicker, inverted flicker and white flicker of the liquid crystal character.

In the integrated circuit for controlling the flicker of the liquid crystal character according to the present invention, the control unit displays the character as it is if the data of IV / BK is 0/0, if the data of IV and BK is 0/1 the character to black state If the data of IV and BK is 1/0, the character is displayed in an inverted state, and if the data of IV and BK is 1/1, the character is configured to be displayed in a white state.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1A is an exemplary view of an LCD display with a blink function according to the present invention, showing a panel displaying a total of 80 characters.

1B is a diagram showing an example of the type of flicker according to the present invention, which shows black flicker, invert flicker and white flicker.

Figure 1c is a table showing the flicker operated by the function table according to the present invention, showing black flicker, inverted flicker and white flicker.

2 is a table showing a blink setting command according to the present invention, FIG. 2a is a setting command of a DDRAM address, FIG. 2b is a DDRAM blink setting command, and FIG. 2c is a function table of DDRAM blinking. Indicates.

3 is a block diagram illustrating a configuration of a flickering function according to the present invention.

An input / output buffer block and command controller 30 for controlling the address setting command of the DDRAM and the flashing setting command of the DDRAM shown in FIGS. 2A and 2B;

Adds bits for address and scan counters (32), black blinks, and inverted blinks that periodically read DDRAM data under the control of the command controller 30 to generate a signal of RAMOUT 0: 9 from the DDRAM. DDRAM 34 having data for the address, latch 36 storing the output data of RAMOUT0: 9 outputted from DDRAM 34, RAMOUT 0: 7 corresponding to the character to be displayed outputted from latch 38 Character generator ROM (38) which receives the output signal of and the LINE 0: 3 signal specifying each line of one character, selects the font of the character to be displayed, and generates the output signal of ROMOUT 0: 4 corresponding to the selected font. , A signal specifying the output signal of ROMOUT0: 4 output from the character generator ROM 38, the black (BK) and inverted (IV) flicker output from the latch 36, and a signal for selecting the period of the flicker (BLINK_TIMEL) When the input period is flickering, the final FONT 0: 4 signal is displayed on the LCD panel by converting the ROMOUT0: 4 signal output from the character generation ROM 38 according to the flicker function according to the status of BK and IV. It consists of a DDRAM flicker control unit 40 to output the.

4 is a detailed view of the DDRAM 34 in FIG. 3, in which IV and BK signals are assigned to respective addresses.

5 is a detailed view of the flash control section 40 of the DDRAM 3, the configuration of the DDRAM flash control section 40 is as follows.

The ROMOUT0: 4 signal output from the character generation ROM is input to the NOR gate 520 in combination with the BK enable signal, and the output of the NOR gate 520 is combined with the IV enable signal to the XOR gate 550. The signals input from the XOR gate 550 are output through the inverter 560, respectively.

Here, the BK enable signal is obtained from the output terminal of the NOR 510 which receives the BK bit signal through the inverter 500 and inputs the output signal and the BLINK_TIMEL signal, and the IV enable signal is the IV bit signal. It is output through the inverter 530, and it is calculated | required from the output terminal of the OR gate 540 which inputs this output signal and the BLINK_TIMEL signal.

Next, the operation of the LCD control integrated circuit according to the present invention will be described with reference to FIGS. 1 to 4.

First, the present invention adds the BK (Black) and IV (Inversion) bits to the DDRAM 34 shown in FIG. 3, thereby specifying the black, inverted and Adding a white blink command enables the selection of each character to blink independently.

The 80 characters displayed, DDRAM 34 from 00H to 4FH, each independently have BK / IV bits. To specify this blink attribute, use the DDRAM address setting command shown in Figure 2a to specify the DDRAM address. The address counter 32 value specifying the address must first be selected. Since the address counter 32 indicates the address of the DDRAM, by changing the address counter value, it is possible to designate the position of the character where the flickering function can be implemented.

The DDRAM blink setting command shown in FIG. 2B is a diagram showing a command for specifying the attribute of the blinking of the selected character. The BAM and IV combination shown in FIG. 2C shows no flicker (NO BLINK). ), BLACK BLINK, INVERSION BLINK, and WHITE BLINK. The three blink functions are displayed in Figure 1b. same.

The attribute specification of BK and IV specifies the address of DDRAM 34 by the DDRAM address setting command (Figure 2a) and DDRAM recording when the BK and IV recording is performed by the DDRAM blink setting command (Figure 2b). When writing data, the DBUS0: 1 signal is written to the DDRAM 0: 1 bit of the DDRAM 34, but during the blink setting command (Figure 2b), the DBUS0: 1 is written to the BK and IV of the DDRAM8: 9. To specify the blinking attribute for each character.

The scanning counter 32 periodically reads data of the DDRAM 34 to which the attribute of blinking is specified to generate a RAMOUT0: 9 signal, which is stored in the latch 36.

The RAMOUT0: 7 signal output from the latch 36 is data corresponding to the character to be displayed, and is a character generator that stores the font of the character to be displayed together with the LINE signal 0: 3 specifying each line of one character. ) To generate ROMOUT0 to ROMOUT 4 signals corresponding to the character shape.

In addition, the signals of RAMOUT8 and ROMOUT9 output from the latch 36 are signals that store the attributes of the BK and IV blinks of the DDRAM 34 and are transmitted to the DDRAM blink control unit 40 to blink. When the blink time is reached, the converted ROMOUT0: 4 signal is converted according to the blink function according to the BK bit and IV bit state to generate the final FONT0: 4 signal displayed on the LCD panel.

In addition, the BLINK_TIMEL signal input to the DDRAM blink control unit 40 is a signal indicating a blink time. When this signal is high, both BK_EN (Black Blink Enable) and IV_EN (Inversion Blink Enable) signals are displayed. Able to input ROMOUT0: 4 signal to FONT0: 4 signal as it is, to be transmitted to FONT0: 4 signal as it is without changing ROM data, and to retain the data of the character generation ROM as shown in FIG. Display.

However, if the blink_TIMEL signal is low, the blink operation is performed according to the signals of the BK bit and the IV bit.

That is, if the BK bit is high, the BK enable (BK_EN) signal is enabled high, which causes all input ROMOUT0: 4 signals to go low. If the IV bit is enabled high, the IV enable (IV_EN) signal is low. To reverse the input ROMOUT0: 4 signal.

Therefore, according to the state of BK and IV, the DDRAM blink control unit 40 performs four operations by the flashing function table of the DDRAM shown in FIG. That is, if IV / BK data is 0/0, the flicker control unit 40 is in a buffer state, and if 0/1, FONT0: 4 is all high, and the black display state is shown in FIG. 1B. If 1/0, ROMOUT0: 4 and FONT0: 4 are inverted so that the display state is reversed like the reversed character. If the IV / BK is 1/1, the FONT0: 4 is all low, and the display state is obtained as shown in FIG. 2C.

In addition, the FONT0: 4 signal is converted into the SEG signal for driving the LCD panel and displayed on the liquid crystal display.

Therefore, as described above, the integrated circuit having the selective blinking function of all the characters of the liquid crystal display according to the present invention can implement the BK and IV attributes of the DDRAM to realize three kinds of blinking functions for one character. Each character can be given the property of flickering independently, so the flickering function can be implemented as desired for every character being displayed through the function of flickering, such as words or strings to be emphasized in the display. Has the effect.

Claims (3)

An integrated circuit for controlling flicker of liquid crystal characters, comprising: a DDRAM having flicker data for each address; A command control unit for controlling the setting command of the DDRAM and the flashing setting command of the DDRAM: an address and scan counter unit for periodically reading DDRAM data having a property of blinking by receiving a signal output from the command control unit; A latch for storing data output from the DDRAM; A character generation ROM that receives an output signal corresponding to the display character output from the latch and a line signal specifying each line of one character, and selects and outputs a font of the character to be displayed; The character is generated by receiving a signal output from the character generation ROM, a signal specifying the attribute of black (BK) and inverted (IV) blinking output from the latch, and a signal (BLINK_TIMEL) selecting a cycle of blinking. Flashing of the liquid crystal character, characterized in that it comprises a DDRAM flicker control unit for outputting the final font signal displayed on the LCD panel by performing a data conversion for flickering the signal output from the ROM according to the status of BK and IV Integrated circuit to control. 2. The integrated circuit of claim 1, wherein the DDRAM adds bits for black blink, invert blink and white blink of the liquid crystal character. The method of claim 1, wherein the control unit displays the characters as they are when the data of IV and BK is 0/0, and displays the characters as black when the data of IV / BK is 0/1, and the data of IV / BK is 1/0. Characterized in that the display is inverted state if 0, and displays the character in a white state if the data of IV / BK is 1/1, the integrated circuit for controlling the flicker of the liquid crystal character.