WO2000002189A1 - Dispositif semi-conducteur, systeme d'affichage d'images et systeme electronique - Google Patents
Dispositif semi-conducteur, systeme d'affichage d'images et systeme electronique Download PDFInfo
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- WO2000002189A1 WO2000002189A1 PCT/JP1999/003642 JP9903642W WO0002189A1 WO 2000002189 A1 WO2000002189 A1 WO 2000002189A1 JP 9903642 W JP9903642 W JP 9903642W WO 0002189 A1 WO0002189 A1 WO 0002189A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/34—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators for rolling or scrolling
- G09G5/346—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators for rolling or scrolling for systems having a bit-mapped display memory
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
Definitions
- the present invention relates to a semiconductor device used for efficiently changing the position of display data displayed on a display device, an image display system using the semiconductor device, and an electronic system using the image display system. is there. More specifically, the present invention relates to an order in which display data stored in a display RAM (Random Access Memory) is supplied to an image display system.
- a display RAM Random Access Memory
- LCD drivers include a segment driver (hereinafter referred to as “X driver”) that drives the LCD data electrodes and a common driver (hereinafter referred to as “Y driver”) that drives the scanning electrodes of LCD.
- X driver is a circuit that receives display data to be displayed on the LCD from a display RAM via a circuit called a display controller, and converts the display data into a voltage necessary to drive the LCD.
- Y driver is a circuit that receives the data from the X driver that selects the line to write the data signal through the display controller and converts the selected / unselected voltage to the voltage required to drive the LCD. is there. Normally, selection lines are scanned line-sequentially.
- FIG. 2 is a schematic configuration diagram of a conventional image display system.
- MPU 1 consists of a central processing unit and wants to display on the LCD It has a function of generating a signal for writing display data to the display RAM.
- the oscillation device 2 has a function of generating a reference clock required for displaying an LCD.
- the X driver 3 with a built-in RAM incorporates a display RAM 31, a display controller (not shown in the figure) composed of an MPU logic 33 and a display logic 34, and an X driver 32 in one chip.
- the Y driver 4 receives the data from the X driver 32 that selects the line to which the data signal is to be written, via the display controller, and converts the selected / unselected voltage to the voltage required to drive the LCD.
- the display power supply 5 has a function of generating a voltage required for displaying an LCD.
- the LCD panels 61 and 62 are the same, but show different screens.
- the display RAM 31 is composed of a dual-port RAM that asynchronously performs an MPU interface and a display system interface.
- the X driver 32 is a circuit that converts the display data read from the display RAM 31 into a voltage required for LCD display.
- the MPU logic circuit 33 has a function of performing processing related to the MPU 1 such as processing of a command sent from the MPU 1 and control of display data read and written to the display RAM 31.
- the display logic circuit 34 has a function of reading out display data from the display RAM 31 and supplying it to the X-drivers 32 and controlling the Y-driver 4 to perform display-related controls.
- the memory area 301 is an area for storing display data.
- the MPU read / write circuit 302 is a circuit that controls reading and writing of the memory area 301.
- the MPU row address 303 is a decoder indicating an address in the Y (row) direction of the memory area 301 at the time of MPU read / write.
- the MPU column address 304 is a decoder that outputs an address in the X (column) direction of the memory area 301 at the time of MPU read / write.
- the display address 305 is a decoder for reading display data to be supplied to the X driver 32 from the display data stored in the memory area 301.
- the display capacity of the LCD panel 61 is 320 x 240 dots, and has 240 common electrodes on the left side of the panel and 320 segment electrodes on the upper side.
- the capacity of the display RAM 31 built into the X driver 3 with built-in RAM is 32 x 240 bits, which is the same as the display capacity of the LCD panel 61.
- the MPU column address 304 of the display RAM 31 is the same as the number of dots in the X direction of the LCD panel 61. have. Display Since the MPU row address 303 of RAM 31 is 8-bit simultaneous writing, it has a 30 address which is the result of dividing 240, which is the number of dots in the Y direction of the LCD panel 61, by 8. are doing.
- the MPU 1 designates an arbitrary address to the MPU column address 304 and the MPU row address 303 via the MPU logic circuit 33, thereby displaying data to be displayed at an arbitrary position in the display RAM 31.
- Writing can be performed via the MPU read / write circuit 302. If the display data corresponding to one bit of the display of the LCD panel 61 is "0", the corresponding predetermined dot of the LCD panel 61 is displayed in white, and " If it is 1 ", it will be displayed in black.
- the display address 305 has the same 240 address as the number of dots in the Y direction of the LCD panel 61.
- the display logic circuit 34 designates one of the display addresses "0" to "239".
- the display RAM31 outputs the same 320-bit data as the number of dots in the X direction of the LCD panel 61 in parallel, and supplies the data to the X-drino and 32. It is.
- the X driver 32 converts the received display data into a voltage necessary for driving the LCD panel 61 and supplies the voltage to the LCD panel 61 for driving.
- FIG. 3 is a time chart of signals of respective parts for explaining the operation of the image display system of FIG. 2, in which a vertical axis represents a logic level and a horizontal axis represents time. The operation of FIG. 2 will be described with reference to FIG.
- a signal 401 is a reset (RES) signal
- a signal 402 is a reference clock DCLK: supplied from the oscillation device 2
- signals 403 and 412 are outputs of an address counter (not shown) included in the display logic circuit 34
- signals 404 and 413 are Indications RAM31 data are captured at the falling edge of the reference clock DCLK at the X driver 32
- X driver data signal 405 is the selection signal YDATA supplied to the Y driver 4
- signals 406 to 411 are the Y driver 4 This is the selection data that is transferred in the 240-stage shift register (not shown).
- the output of the address counter (not shown) in the display logic circuit 34 is initialized to "0" as shown by a signal 403. After that, it is not shown by the rising edge of the reference clock DCLK402.
- the output of the paddle count is counted up as shown by signal 403, and returns to "0" when counted to "239".
- the signal 403, which is an output signal of the address count, is supplied to the display address 305, and the display address is specified in order from "0" to "239".
- YDATA405 is a selection signal supplied to the Y driver 4, where "H” is a signal corresponding to line selection and “L” is a signal corresponding to non-selection.
- YDATA405 becomes “H” from the rising edge of the reset signal RES to the rising edge of the next reference clock DCLK. After that, it goes to "H” every 240 generations of the reference clock DCLK.
- the Y driver 4 captures YDATA at the falling edge of the reference clock DCLK, and transfers the YDATA by an internal 240-stage shift register (not shown).
- the output of each register in the 240-stage shift register is as shown in signals 406 to 411, which is the data for each of the 240 Y driver 4 terminals.
- each register is converted into a voltage required for liquid crystal display and supplied to the LCD panel 61, which drives the LCD panel 61.
- the signal of the signal Y0 (406) is converted into a voltage necessary for the liquid crystal display and supplied to the terminal at the upper end of the LCD panel 61, and the signal of the signal Yl (407) is supplied to the next terminal below. Evening is supplied, and the data of signal # 2 (408) is similarly supplied to the next terminal below. That is, one of the 240 common electrodes is selected, and the selected electrode is scanned from the upper end to the lower end electrode.
- the display address 305 of the display RAM 31 has addresses “0” to "239” from the upper end to the lower end.
- the MPU 1 stores the data of “mouth”, “ ⁇ ”, and “ ⁇ ” over the display addresses “0” to “239”. Evening is written.
- This display data is a schematic representation of the memory area 301 where "1" is displayed in black and "0” is displayed in white. Are electrically written in the memory area 301.
- the X-driving clock 32 is displayed at the next falling edge of the reference clock DCLK.
- the display data of address “0” is output to the segment electrode as shown in X driver 404.
- Y driver 4 Since the selection signal is output to the common electrode at the upper end of the LCD panel 61 as shown in the signal Y0 (406), the data of the display address "0” is written to the upper line of the LCD panel 61. Is displayed.
- the X driver 32 outputs the display data of the display address "1" to the segment electrode as indicated by the X driver data 404.
- the Y driver 4 since the Y driver 4 outputs the selection signal to the second common electrode from the upper end of the LCD panel 61 as shown by the signal Yl (407), the Y driver 4 applies the selection signal to the second line from the upper end of the LCD panel 61.
- the display address "1" is written and displayed.
- the next display data is written to the next selected line and displayed.
- data " ⁇ " and “ ⁇ ” are written in the display RAM31 over the display addresses "0" to "239”, and the display addresses are counted from “0” to "239”.
- the common electrode is selected line by line from the upper side, and as a result, as shown in FIG. 2, the display address of the display RAM 31 is “0” as shown in FIG. They are displayed from the upper side to the lower side of the LCD panel 61 in the order of "to” 239 ".
- the display address is initialized to, for example, "120" by the reset signal RES (401) as shown in the output 412 of the address count signal in FIG. 3, the next reference clock DCLK (402 ).
- the X-dryno 32 outputs the display data of the display address "120” to the segment electrode as shown in X driver data (413).
- the Y driver 4 outputs the selection signal to the common electrode at the upper end of the LCD panel 62 as shown by the signal Y0 (406), the display address "1 20 "Is written and displayed.
- the X-Dryno, '32 outputs the display data of the display address "1 2 1" to the segment electrode like the X driver data (413).
- the Y driver 4 outputs the selection signal to the second common electrode from the upper end of the LCD panel 62 as shown by the signal Yl (407), the second driver from the upper end of the LCD panel 62
- the display address "1 2 1" is written and displayed on the line.
- the next display data is written to the next selected line and displayed.
- the display address of the address counter (not shown) in the display logic circuit 34 is set to a predetermined initial value at the timing of the reset signal RES (401).
- the MPU 1 can freely set the initial value of the display address via the MPU logic circuit 33. Therefore, the MPU 1 simply writes the initial value of the display address to be displayed at the upper end of the LCD panel 61 at the address counter (not shown) in FIG. You can scroll vertically.
- the entire screen of the LCD panel 61 scrolls.
- the display area of the display RAM 31 where the scrolling is desired is performed.
- the display data must be rewritten from MPU 1 via the MPU logic circuit 33. In this case, the number of accesses from the MPU 1 to the X driver 3 with built-in RAM greatly increases, and the power consumption of the display system increases.
- an object of the present invention is to provide a semiconductor that has solved the above problems. It is an object of the present invention to provide an apparatus, an image display system, and an electronic system using the same.
- a first aspect of the present invention is a memory for storing display data, A voltage converter for converting a logical voltage based on the display data into a drive voltage for driving a display device, reading the display data from the memory according to a reference clock, and converting the display data in accordance with the read display data.
- a semiconductor device that supplies the drive voltage thus obtained to the display device comprising: a count unit that controls an address of the memory; and a register that stores an arbitrary address, wherein a display data stored in the memory is stored.
- the order of reading is set arbitrarily based on the contents of the registration.
- a memory for storing display data
- a display controller for reading the display data from the memory in accordance with a reference clock, and supplying the read display data to a voltage conversion unit.
- a voltage converter that converts a logic voltage based on the supplied display data into a driving voltage for driving a display device, and supplies the driving voltage to the display device.
- a counting unit that counts addresses of the memory; and a register that stores an arbitrary address. The order in which display data stored in the memory is read out is arbitrarily set based on the contents of the register. It is characterized by.
- a third aspect of the present invention is characterized in that the image display system has at least one fixed display area and at least one scrollable display area.By adopting such a configuration, the present invention provides: By providing a register for storing an arbitrary address, the display address of the memory for storing the display data to be given to the display device can be specified in the order of counting from the arbitrary address to the arbitrary address and then jumping to the arbitrary address. It is counted up to any address. Therefore, partial scrolling of the display is performed without rewriting the data in the memory. As a result, the semiconductor device of the present invention provides an image display system and an electronic device.
- FIG. 1 is a configuration diagram of an image display system according to a first embodiment of the present invention.
- FIG. 2 is a configuration diagram of a conventional image display system.
- FIG. 3 is a time chart of FIG.
- FIG. 4 is a circuit diagram of the display logic circuit 134 in FIG.
- FIG. 5 is a circuit diagram of the coincidence detection circuit 514 in FIG.
- FIG. 6 is a time chart of FIG.
- FIG. 7 is a time chart of FIG.
- FIG. 8 is a configuration diagram of an image display system according to a second embodiment of the present invention.
- FIG. 9 is a time chart of FIG.
- FIG. 10 shows an image display system according to a third embodiment of the present invention.
- FIG. 11 is a circuit diagram of the display logic 134B in FIG.
- FIG. 12 is a time chart of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a schematic configuration diagram of an image display system showing a first embodiment of the present invention.
- This image display system has an MPU 11.
- the MPU 11 is composed of a central processing unit and has a function of generating a signal for writing display data to be displayed on the LCD to the display RAM.
- the oscillating device 12 has a function of generating a reference clock required for the LCD display.
- the X driver 13 with a built-in RAM has a display RAM 131, a display controller composed of an MPU logic 133 and a display logic 134 (not shown), and an X driver 132 built in one chip.
- the Y Dryo 14 receives the data through the display controller to select the line to write the data signal supplied from the X Dryo '132 through the display controller, and requires the select / non-select voltage to drive the LCD.
- the display power supply 15 has a function of generating a voltage necessary for displaying an LCD.
- the LCD panels 161 and 162 are the same, but show different screens.
- the display RAM 131 performs the asynchronous operation between the MP U interface and the display interface. Consists of Alport Ram.
- the X driver 132 is a circuit that converts display data read from the display RAM 131 into a voltage required for LCD display.
- the MPU opening circuit 133 has a function of performing processing related to the MPU 11 such as processing of a command sent from the MPU 11 and control of display data to be read from and written to the display RAM 131.
- the display logic circuit 134 has a function of reading display data from the display RAM 131 and supplying the read data to the X driver 132 and a function of performing display control such as the control of the Y driver 14.
- the memory area 1301 is an area for storing display data.
- the MPU read / write circuit 1302 is a circuit that controls reading and writing of the memory area 1301.
- the MPU row address 1303 is a decoder that indicates the address of the memory area 1301 in the Y (row) direction at the time of MPU read / write.
- the MPU column address 1304 is a decoder that indicates the address of the memory area 1301 in the X (column) direction at the time of MPU read / write.
- the display address 1305 is a decoder for reading out display data to be supplied to the X driver 132 from the display data stored in the memory area 1301.
- the display capacity of the LCD panel 161 is 320 ⁇ 240 dots, and has 240 common electrodes on the left side of the panel and 320 segment electrodes on the upper side.
- the capacity of the display RAM 131 built in the RAM built-in X driver 13 is 320 x 240 bits, which is the same as the display capacity of the LCD panel 161.
- the display MPU column address 1304 of the RAM 131 has the same 320 address as the number of dots in the X direction of the LCD panel 61. Since the MPU row address 1303 of the display RAM 131 is an 8-bit simultaneous write, it has 30 addresses which are the result of dividing 240, which is the number of dots in the Y direction, of the LCD panel 161 by 8. .
- the MPU 11 displays the desired data to be displayed by specifying an arbitrary address to the MPU column address 1304 and the MPU row address 1303 through the MPU logic circuit 133. It can be written via circuit 133 and MPU read-write circuit 1302. One bit of the display data corresponds to one dot of the display on the LCD panel 161. If the display data is "0", the corresponding predetermined dot on the LCD panel 161 is displayed in white, and if the display data is "1", it is displayed in black.
- the display address 1305 has the same 240 addresses as the number of dots in the Y direction of the LCD panel 161.
- the display logic circuit 134 specifies one of the display addresses “0” to “239”.
- the display RAM 131 When the display address is specified, the display RAM 131 outputs the data of 320 bits, which is the same as the number of dots in the X direction of the LCD panel 161, in parallel, and supplies it to the X dry line 132.
- the X driver 132 converts the received display data into a voltage necessary for driving the LCD panel 161 and supplies the voltage to the LCD panel 161 for driving.
- FIG. 4 is a circuit diagram of the display logic circuit 134 in FIG.
- the counters 501 to 503 are 8-bit address counters with a reset.
- Registers 504 to 509 store an 8-bit address.
- the counter 510 is an 8-bit counter with reset.
- the selectors 511 to 513 select either data A or data B of two 8-bit systems, and select data A by inputting "L” to the select terminal S. , "H” to select data B.
- the match detection circuit 514 compares two sets of 8-bit data.
- the reset reset flip-flop (hereinafter referred to as “RSFF”) 515 outputs “L” when a “H” pulse is input to the reset terminal R, and outputs “H” to the set terminal S. "When a pulse is input,” H “is output.
- the OR gate 516 is a circuit that takes the logical sum of two input signals. Signal 525 is the address count output.
- FIG. 5 is a circuit diagram showing an example of the coincidence detection circuit 514 in FIG.
- reference numeral 517 is an exclusive NOR circuit (hereinafter referred to as “Factory EXN”)
- reference numeral 518 is a 4-input AND circuit
- reference numeral 519 is a 2-input AND circuit
- reference numeral 520 is an inverter circuit.
- reference numeral 521 indicates a delay flip-flop (hereinafter referred to as “D—FF”)
- reference numeral 522 indicates an 8-bit comparison output
- reference numeral 523 indicates a D-FF output
- reference numeral 524 indicates a match detection output.
- FIG. 6 is a time chart of the signals of the respective parts for explaining the operation of FIG. 1
- FIG. 7 is a time chart of the signals of the respective parts for explaining the operation of FIG. 4.
- Level and time are shown on the horizontal axis. The operation of the image display system in FIG. 1 will be described with reference to FIGS. 6, 7, and 4.
- a signal 1401 is a reset (RES) signal
- a signal 1402 is a reference clock DCLK supplied from the oscillator 12
- signals 1403 and 1412 are outputs of an address counter (not shown) included in the display logic circuit 134
- signals 1404 and 1413 are Display RAM131 data is X-Dryno
- X-Driver data is captured at the falling edge of the reference clock DCLK at 132
- Signal 1405 is the selection signal YDATA supplied to the Y-driver 14
- Signals 1406 to 1411 are the Y-driver 14.
- the selected data is transferred by a 240-stage shift register (not shown).
- the selection signal YDATA (1405) is a selection signal supplied to the Y driver 14, where "H” corresponds to line selection and “L” corresponds to non-selection.
- the selection signal YDATA (1405) becomes “H” from the rising edge of the reset signal RES to the rising edge of the next reference clock DCLK. After that, it goes to "H” every 240 generations of the reference clock DCLK.
- the Y dryer 14 receives the selection signal YDATA at the falling edge of the reference clock DCLK, and transfers the selection signal YDATA by an internal 240-stage shift register (not shown).
- the output of each register of the 240-stage shift register is as shown by signals 1406 to 1411, which is the data of each of the 240 Y dryno 14 terminals.
- each register is converted into a voltage required for liquid crystal display and supplied to the LCD panel 161 to drive the LCD panel 161.
- the signal at the upper end of the LCD panel 161 is converted from the signal Y0 (1406) into a voltage required for liquid crystal display and supplied to the terminal below, and the data of the signal Yl (1407) is supplied to the next lower terminal.
- the data of the signal # 2 (1408) is similarly supplied to the next adjacent terminal. That is, one of the 240 common electrodes is selected, and the selected electrodes are scanned from the upper end to the lower end electrode.
- the display address 1305 of the display RAM 131 has addresses “0” to “239” from the upper end to the lower end.
- the memory area 1301 stores the data of “mouth”, “ ⁇ ”, and “ ⁇ ” in the display address “0,.
- the place where "1" is written is black
- the display, "0" is a schematic representation of the white display because it is white, and is actually written electrically in the memory area 1301.
- the display RAM 131 supplies 32 bits of display data of the address to the X driver 32. Therefore, the display address is changed from “0" to "239". If the X clock is incremented in synchronization with the reference clock DCLK one after another, the X driver, 32 captures the data at the falling edge of the reference clock, converts the voltage, and outputs it. When the electrode of "1" is selected, the data of display address "0" is output to the segment electrode and displayed. When the second electrode from the top of the common electrode is selected, the data of display address "1" is displayed on the segment electrode. They are displayed in order, such as being output to the electrodes and displayed.
- This embodiment shows a method of scrolling the display between fixed display areas at the top and bottom of the display screen and changing the display address counting data in various ways.
- the display of " ⁇ ” is not moved (fixed display), and only the display of " ⁇ ” is scrolled. For example, display addresses "0" to “79” in which the display data of " ⁇ ” is written are fixed on the upper display area, and display data "160” in which the display data of " ⁇ ” are written all the time. " ⁇ ” 2 3 9 "is called the bottom fixed display area.
- a signal 401 is a reset signal RES
- a signal 402 is a reference clock DCLK supplied from the oscillator 12
- a signal 414 is an output of the counter 501
- a signal 415 is an output of the EXN517
- a signal 416 is DF.
- the counter 501 At the rising edge of the reset signal RES (401), the counter 501 is set to "0". Set to output "0". Counters 502 and 503 and power counter 510 are reset and output "0". Selectors 512 and 513 input “L” to terminal S via RSF F515. And data A is selected. Since selectors 2 and 3 are selecting data A, the address count output 525 outputs "0" which is output by the counter 501. The address count output 525 is supplied to the display address 1305 of the display RAM 131 shown in FIG. 1, and the display address is selected.
- a scroll area, a fixed display area, and an arbitrary address indicating the number of display lines are written from the MPU 11 via the MPU logic circuit 133. That is, in the register 504, "79" which is the last of the display address in which "mouth” which is the upper fixed display area is written is written. The scroll start address "120" to be displayed first is written to the register 505 among the display addresses "80" to "159” in which the scroll area " ⁇ ” is written. Have been. In the register 506, "1" is displayed at the end of the display address "79” where the fixed display area "mouth” is written. "80” which is added by the mouth jump circuit 133 is written. I have.
- the counter 501 counts up at the rising edge of the reference clock DCLK supplied from the oscillator 12. When the count 501 counts up to “79”, it matches the final address “79” of the upper fixed display area stored in the register 504, so that the match is detected by the match detection circuit 514 and the reference clock is output. Outputs "H” for half a clock period from the next rising edge of DCLK to the falling edge.
- EXN517 outputs “H” when the two input signals match.
- the 4-input AND circuit 518 outputs “H” when all four input signals become “H”.
- the two-input AND circuit 519 outputs "H” when both inputs become “H”. Therefore, since there are eight EXN517s, "H” is output to the 8-bit comparison output 522 when all of the 8-bit data match.
- the output signal of the 8-bit counter 501 becomes “H” in coincidence with the period when the output signal becomes “ ⁇ 9”.
- the 8-bit comparison output 522 is latched by the reference clock DCLK inverted by the D-FF521 via the inverter 520, and the output of the D-; FF 521 is shown as the D-FF output 416. So, half a clock late.
- D—F The output signal of F521 is ANDed with the reference clock by the AND circuit 519, and as a result, the output signal 524 of the match detection is the next half of the matched address as shown by the match detection output 417. It outputs "H" to the clock.
- the "H” signal output from the match detection circuit 514a is input to the terminal S of the selector 512 via the RSF 515b, and the data B is selected. Therefore, the output “1 2 0” of the count 502 is output to the address count output 525 via the selectors 512 and 513.
- the count 502 counts up at the rising edge of the reference clock DCLK.
- the count 510 also counts up at the rising edge of the reference clock DCLK, and when counting up to "159", it matches the value of "159" stored in the register 508.
- a match is detected by the detection circuit 514c, and an "H” pulse is output. Since the output of the register 509 in which the head address "160" of the lower fixed display area is written is connected to the counter 503, "160” is input to the counter 503. Since the output of the match detection circuit 514c is connected to the set terminal S of the counter 503, an "H” pulse is input by the match detection circuit 514c, and "166” is set to the counter 503. .
- the "H” pulse output from the match detection circuit 514c is input to the terminal S of the selector 513 via the RSF 515c, and data B is selected. Therefore, "160” is output to the address output 525.
- the match detection circuit 514d when the counter 503 counts up at the rising edge of the reference clock DCLK and counts up to “239”, it matches the fixed address “239”, so the match is detected by the match detection circuit 514d. Is detected, and "H" pulse is output. This becomes the reset signal RES through the OR gate 516b, and the setting returns to the initial state. Then, as long as the reference clock DCLK is input, the address counting is repeated.
- the address count output 525 starts from the reset signal RES, and starts from "0" to "79", “122” to “159", " Addresses are output in the order of "80" to "1 19” and "160” to "239".
- the Y driver 14 selects the reset signal RES as a start and selects the line sequentially from the top line of the LCD panel 161, the display is in the scroll display area as shown on the LCD panel 161. " ⁇ " is displayed with the upper half and the lower half reversed.
- Scrolling is performed on the register 505 which stores the scroll start address to be displayed at the top of the display addresses "80" to "159” in which the scroll area " ⁇ ” is written. This can be done by changing the night. For example, if “90” is written to the register 505, the reset signal RES will be started and “0” to “79", “90” to “159”, and “80” to " Addresses are output in the order of 89, ..., "160” to “239” In addition, if "80” is written to register 505, the reset signal RES starts and "0" The address is output in the order of "7 9", "80” to "159", “160” to “239” As a result, when "0” is written to register 505 Will be as shown on the LCD panel 162 in FIG.
- the MPU 11 can perform vertical scrolling of only a part of the screen by writing the first display address to be scrolled to the register 505 without rewriting the display data of the display RAM 131 at all.
- the scroll display area can be freely changed by changing the data of Regis 504 and Regis 506-509. Also, the input data "0" of the county 501 and the input data "239" of the county 503 are fixed values. However, if input data of other values is supplied from another register (not shown), Another address can be set. Also, when the upper fixed display area is fixedly displayed and the other scroll area and the lower fixed display area are all scrolled, the lower fixed display area is fixedly displayed, and the other upper fixed display area and the other fixed fixed display areas are displayed. In the case where all scrollers are scrolled, it can be easily realized in the same manner as in the present embodiment. Furthermore, in FIG. 4, the screen can be divided into an arbitrary number in the vertical direction by adding an arbitrary number of registers and counters similar to the registers 504 to 509 and inputting an arbitrary address. The same scrolling as can be performed.
- FIG. 8 is a configuration diagram of an image display system according to a second embodiment of the present invention. Elements common to the elements in FIG. 1 according to the first embodiment are denoted by the same reference numerals. You.
- a large storage capacity for example, a capacity of 320 ⁇ 320 bits
- a display logic 134A having a different configuration
- the RAM 131A has a storage capacity that is larger than the storage capacity necessary to display the entire screen.
- the memory area 1301 stores the data of “mouth”, “ ⁇ ”, “X”, and “ ⁇ ” over the display addresses “0” to “3 19” as shown in FIG. Evening is written. For further details, display “ ⁇ ” over the display address "0"-”79", display “ ⁇ ” over the display address "80”-”159", display The data of "X” is written over "160” to "2 39" of the address, and the data of " ⁇ ” is written over "240" to "3 19” of the display address. . In the display logic 134A, the input data "3 19" is set instead of the input data "2 3 9" of one of the match detection circuits 514d in FIG. 4 showing the first embodiment. Other configurations are the same as those in FIG.
- FIG. 9 is a time chart of signals of each section for explaining the operation of FIG. 8, in which a vertical axis represents a logic level and a horizontal axis represents time. The operation of the image display system of FIG. 8 will be described with reference to FIG.
- the basic operation is the same as that of Fig. 7, except that the output 414 of the county 501, the output 419 of the county 502, and the output 422 of the county 502 are different. That is, an arbitrary address indicating the scroll area, the fixed display area, and the number of display lines is written in the registers 504 to 509 via the MPU logic circuit 133 from the MPU 11.
- "79" which is the last of the display address in which the upper fixed display area "mouth” is written, is written.
- the Scroll areas " ⁇ " and "X” are displayed. Of the displayed display addresses “80” to "239", the scroll address "8" to be displayed at the top is displayed.
- the register number 508 is the number of display lines. From “240”, “80”, which is the number of display lines of the display address where the lower fixed display area “ ⁇ ” is written, is subtracted, and “1” is further subtracted from “160”. "159” is written, and the register address 509 is written with “240” which is the head of the display address where the lower fixed display area " ⁇ " is written.
- the operation of the circuit is the same as that of the first embodiment.
- the address count output 525 given to the display address 1305 is shown by the address count output 426 in FIG.
- the addresses are output in the order of "0" to "79", “80” to "159", and "240" to "319".
- the Y driver 14 selects the reset signal RES as a start and line-sequentially from the top line of the LCD panel 161, as shown in the LCD panel 161, “ ⁇ ”, “ Only “ ⁇ ” of "X” is displayed, "X” is not displayed.
- the scroll address to be displayed first is stored. This can be done by changing the data in register 505. For example, if “160” is written to the register 505, the reset signal RES will be started, and “0” to “79", “166” to “239", and “240” The addresses are output in the order of "3 1 9". As a result, "0" to display when writing to the register 505 in place of the " ⁇ ” that was displayed before the c scroll becomes as shown on the LCD panel 1 6 2 Figure 8 "X" is Appears on the display.
- the scroll display area can be freely changed by changing the data in the register 504 and the registers 506 to 509. Also, the input data "0 0 0" of the counter 501 and the input data "3 19" of the counter 503 are fixed values, but the input data of other values is changed to another register data (not shown). If you supply from, another address can be set. Further, when the upper fixed display area and all other areas are scrolled, or when the lower fixed display area and all other areas are scrolled, the same method as in the present embodiment can be easily realized. In the first and second embodiments, the drive method in which the number of selected lines by the Y driver 14 is one is performed. However, the drive method of simultaneously selecting a plurality of lines can be easily performed with the same gist as the present invention. realizable.
- the display logic 134A an arbitrary number of registers, counters, etc. similar to the registers 504 to 509 are added, and an arbitrary address is input.
- the scrolling can be performed in the same manner as in the present embodiment.
- FIG. 10 is a configuration diagram of an image display system showing a third embodiment of the present invention. Elements common to those in FIG. 1 showing the first embodiment are denoted by the same reference numerals. ing.
- FIG. 11 is a circuit diagram of a main part of the display logic 134B in FIG. 10. Elements common to the elements in FIG. 4 are denoted by the same reference numerals.
- the display logic 134B includes a register 505 for storing a scroll start address (for example, “1 2 0”), a register 506 for storing a first address of the scroll area (for example, “8 0”), and a last address of the scroll area. (example For example, it has a register 507 and a register 508 for storing "1 5 9").
- the register number 508 is obtained by subtracting "80" corresponding to the number of display lines of the display address where the lower fixed display area "room” is written from "240" which is the number of display lines to "160". "1 59” which is obtained by subtracting "1" from “” is written.
- the input terminal A of the selector 511b is connected to the register 505, and the input terminal B of the selector 511b is connected to the register 506.
- a decrement circuit (a circuit for subtracting 1) 523 is connected to the register 506, and one input side of the coincidence detection circuit 514a is connected to the decrement circuit 523.
- an increment circuit (a circuit for adding 1) 524 is connected, and one input side of the coincidence detection circuit 514b is connected.
- One input side of the match detection circuit 514c is connected to the register 508.
- the reset signal RES and the signal DATA are input to an OR circuit 521.
- the output terminal of the OR circuit 521 is connected to the reset terminal R of the counter 510 for counting the reference clock DCLK and the terminal R of the RS FFs 522a, 522b, 522c.
- the other input side of the coincidence detection circuit 514c is connected to the output side of the counter 510.
- the output side of the match detection circuit 514c is connected to the terminal S of the RSF F522c and the first input terminal of the OR circuit 516.
- the signal DATA is input to the second input terminal of the OR circuit 516.
- the output side of the coincidence detection circuit 514a is connected to the third input terminal of the OR circuit 516 and the terminal S of the RSF F522b.
- the terminal S of the selector 511b is connected to the output side of the RS FF522a.
- the input terminal B of the selector 511a is connected to the output side of the selector 511b, and data "000" is input to the input terminal A of the selector 511a.
- the terminal S of the selector 511a is connected to the output side of the RSFF 522b.
- the input terminal A of the selector 511c is connected to the output side of the selector 511a, and the input terminal B of the selector 511c is connected to the output side of the increment circuit 524.
- the input terminal D of the counter 503 is connected to the output side of the selector 511c, and the reference clock DCLK is input to the clock input terminal CK of the counter 503.
- a reset signal RES is input to a reset terminal R of the counter 503.
- the other input side of the match detection circuit 514a is connected to the output side of the counter 503 and the match detection circuit 514a.
- the other input side of the road 514b is connected. From the output side of the counter 503, an address count output 525 is output.
- the output side of the coincidence detection circuit 514b is connected to the fourth input terminal of the OR circuit 516 and the terminal S of the RSF F522a.
- FIG. 12 is a time chart of signals of respective parts for explaining the operation of the image display system of FIG.
- the scroll start address "120" is set in the register 505
- the first address "80” of the scroller is set in the register 506
- the last address of the scroller is set in the register 507.
- “80” corresponding to the number of display lines of the display address where “ ⁇ ” which is the lower fixed display area is written from “240” which is the number of display lines "159”, which is obtained by subtracting "1” from “160” obtained by subtracting "1”, is written, and the operation almost similar to that of the first embodiment is performed with a simpler configuration than the display logic 134 shown in FIG. Performed with display logic 134B.
- the MPU 11 sets the display data of the display RAM 131 by performing the initial setting of the scroll error and the fixed display error. You can scroll only a part of the screen by writing the first display address you want to scroll at the registration evening without rewriting the night. Therefore, the number of accesses from the MPU 11 to the display RAM 131 is greatly reduced as compared with the case where the display data in the scroll portion is rewritten, and the power consumption during scrolling can be greatly reduced.
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- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP99926954A EP1011087A4 (en) | 1998-07-03 | 1999-07-05 | SEMICONDUCTOR DEVICE, PICTURE DISPLAY SYSTEM AND ELECTRONIC SYSTEM |
US09/486,959 US6486865B1 (en) | 1998-07-03 | 1999-07-05 | Semiconductor device, image display system and electronic system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP10/189424 | 1998-07-03 | ||
JP18942498 | 1998-07-03 |
Publications (1)
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WO2000002189A1 true WO2000002189A1 (fr) | 2000-01-13 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP1999/003642 WO2000002189A1 (fr) | 1998-07-03 | 1999-07-05 | Dispositif semi-conducteur, systeme d'affichage d'images et systeme electronique |
Country Status (3)
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US (1) | US6486865B1 (ja) |
EP (1) | EP1011087A4 (ja) |
WO (1) | WO2000002189A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1156469A3 (en) * | 2000-05-19 | 2002-07-17 | Mitsubishi Denki Kabushiki Kaisha | Display control device |
US6486865B1 (en) | 1998-07-03 | 2002-11-26 | Seiko Epson Corporation | Semiconductor device, image display system and electronic system |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3912207B2 (ja) | 2001-11-12 | 2007-05-09 | セイコーエプソン株式会社 | 画像表示方法、画像表示装置及び電子機器 |
JP2004287165A (ja) * | 2003-03-24 | 2004-10-14 | Seiko Epson Corp | 表示ドライバ、電気光学装置、電子機器及び表示駆動方法 |
KR100992133B1 (ko) * | 2003-11-26 | 2010-11-04 | 삼성전자주식회사 | 신호 처리 장치 및 방법 |
JP4148170B2 (ja) * | 2004-03-23 | 2008-09-10 | セイコーエプソン株式会社 | 表示ドライバ及び電子機器 |
US20060007237A1 (en) * | 2004-07-08 | 2006-01-12 | Eric Jeffrey | Apparatuses and methods for sharing a memory between display data and compressed display data |
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JPS55147670A (en) * | 1979-05-04 | 1980-11-17 | Casio Computer Co Ltd | Image display controller |
JPS6055389A (ja) * | 1983-09-07 | 1985-03-30 | 株式会社日立製作所 | 文字図形表示装置 |
JPS6073573A (ja) * | 1983-09-29 | 1985-04-25 | 三菱電機株式会社 | 表示装置の制御方式 |
JPS60102689A (ja) * | 1983-10-18 | 1985-06-06 | デイジタル・エクウイプメント・コーポレイシヨン | Crtディスプレイ装置 |
JPS63204294A (ja) * | 1987-02-20 | 1988-08-23 | 株式会社富士通ゼネラル | 画面分割表示方法 |
JPH0294A (ja) * | 1985-01-31 | 1990-01-05 | Ricoh Co Ltd | 文字等の表示装置 |
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JPS61151691A (ja) * | 1984-12-20 | 1986-07-10 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | 表示装置 |
JP3274682B2 (ja) * | 1990-08-27 | 2002-04-15 | 任天堂株式会社 | 静止画像表示装置およびそれに用いる外部記憶装置 |
US5854629A (en) * | 1996-12-31 | 1998-12-29 | International Business Machine Corporation | Enhanced scrolling technique for context menus in graphical user interfaces |
US6486865B1 (en) | 1998-07-03 | 2002-11-26 | Seiko Epson Corporation | Semiconductor device, image display system and electronic system |
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1999
- 1999-07-05 US US09/486,959 patent/US6486865B1/en not_active Expired - Lifetime
- 1999-07-05 WO PCT/JP1999/003642 patent/WO2000002189A1/ja not_active Application Discontinuation
- 1999-07-05 EP EP99926954A patent/EP1011087A4/en not_active Ceased
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JPS55147670A (en) * | 1979-05-04 | 1980-11-17 | Casio Computer Co Ltd | Image display controller |
JPS6055389A (ja) * | 1983-09-07 | 1985-03-30 | 株式会社日立製作所 | 文字図形表示装置 |
JPS6073573A (ja) * | 1983-09-29 | 1985-04-25 | 三菱電機株式会社 | 表示装置の制御方式 |
JPS60102689A (ja) * | 1983-10-18 | 1985-06-06 | デイジタル・エクウイプメント・コーポレイシヨン | Crtディスプレイ装置 |
JPH0294A (ja) * | 1985-01-31 | 1990-01-05 | Ricoh Co Ltd | 文字等の表示装置 |
JPS63204294A (ja) * | 1987-02-20 | 1988-08-23 | 株式会社富士通ゼネラル | 画面分割表示方法 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6486865B1 (en) | 1998-07-03 | 2002-11-26 | Seiko Epson Corporation | Semiconductor device, image display system and electronic system |
EP1156469A3 (en) * | 2000-05-19 | 2002-07-17 | Mitsubishi Denki Kabushiki Kaisha | Display control device |
US6989825B2 (en) | 2000-05-19 | 2006-01-24 | Mitsubishi Denki Kabushiki Kaisha | Display control device |
Also Published As
Publication number | Publication date |
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EP1011087A4 (en) | 2005-01-19 |
US6486865B1 (en) | 2002-11-26 |
EP1011087A1 (en) | 2000-06-21 |
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