JP2010066590A - Display driver, display driver apparatus, electrooptical apparatus, and method of setting plurality of parameter data to display driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display driver and the like relieving a burden on a processor. <P>SOLUTION: The display driver 10 for driving an electrooptical panel includes: a parameter register circuit 30 for storing multiple pieces of parameter data; control circuits 524, 526, 544, 590, 610 for controlling the electrooptical panel based on the multiple pieces of parameter data stored to the parameter register circuit; a first nonvolatile memory circuit 546 for storing a part of the multiple pieces of parameter data; and a register writing circuit 20 for writing one part of the multiple pieces of parameter data stored to the first nonvolatile memory circuit at given timing and the other part of the multiple pieces of parameter data stored to a second nonvolatile memory of the outside of the display driver to the parameter register circuit. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a display driver, a display driver device, an electro-optical device, a method for setting a plurality of parameter data in a display driver, and the like.

  The electro-optical device can include a display driver (for example, Patent Document 1 and Patent Document 2). For example, the display driver is either a nonvolatile memory outside the display driver (for example, EEPROM (Electrically Erasable and Programmable Read Only Memory)) or an internal nonvolatile memory circuit (for example, OTPROM (One Time Programmable ROM)). Are stored in a parameter register circuit (for example, a control register).

JP 2005-182080 A JP 2005-195746 A

  According to some aspects of the present invention, it is possible to provide a display driver, a display driver device, an electro-optical device, and a method for setting a plurality of parameter data in the display driver that reduce the burden on the processing device.

  Hereinafter, a plurality of embodiments according to the present invention will be exemplified. Several aspects illustrated below are used in order to understand this invention easily. Thus, those skilled in the art should note that the present invention is not unduly limited by the aspects illustrated below.

One aspect of the present invention is a display driver for driving an electro-optical panel,
A parameter register circuit for storing a plurality of parameter data;
A control circuit for controlling the electro-optic panel based on the plurality of parameter data stored in the parameter register circuit;
A first nonvolatile memory circuit for storing a part of the plurality of parameter data;
The part of the plurality of parameter data stored in the first nonvolatile memory circuit and the plurality of parameter data stored in a second nonvolatile memory outside the display driver at a given timing A register writing circuit for writing the other part to the parameter register circuit;
Related to the display driver.

  The display driver can use the first nonvolatile memory circuit and the second nonvolatile memory. When the initial value is written in the second nonvolatile memory, the second nonvolatile memory can be uniquely set, and the burden on the processing apparatus can be reduced.

In one embodiment of the present invention, the display driver is
A decoder circuit for decoding command data from the processing device;
An external memory control circuit that controls writing to the second nonvolatile memory with respect to the other part of the plurality of parameter data stored in the parameter register circuit according to a decoding result of the decoding circuit;
May further be included.

  The processing device need only transmit command data indicating writing to the second nonvolatile memory to the display driver. When the initial value is written in the second nonvolatile memory, the burden on the processing device 130 can be reduced.

In one embodiment of the present invention, the display driver is
An internal memory control circuit for controlling writing to the first nonvolatile memory circuit with respect to the part of the plurality of parameter data stored in the parameter register circuit according to a decoding result of the decoding circuit; But you can.

In the aspect of the invention, the external memory control circuit may perform the second nonvolatile operation on the part of the plurality of parameter data stored in the parameter register circuit according to a decoding result of the decoding circuit. You may control writing to the memory,
In the first mode, the register writing circuit has the part of the plurality of parameter data stored in the first nonvolatile memory circuit at a given timing, and a second outside the display driver. The other part of the plurality of parameter data stored in the nonvolatile memory may be written to the parameter register,
In the second mode, the register write circuit may include the part of the plurality of parameter data and the other part stored in a second nonvolatile memory outside the display driver at the given timing. May be written to the parameter register.

  In the aspect of the invention, the given timing may be at power-on, system reset, or refresh.

  In the aspect of the invention, the part of the plurality of parameter data may be parameter data set according to characteristics of the electro-optical panel.

Another aspect of the present invention is a display driver device,
The display driver according to any one of claims 1 to 6,
The second nonvolatile memory storing the other part of the plurality of parameter data in each of a plurality of regions;
Including
The register write circuit includes the part of the plurality of parameter data stored in the first nonvolatile memory circuit at the given timing in a given operation mode of the plurality of operation modes; The other part of the plurality of parameter data stored in the given area corresponding to the given operation mode in the given area of the second non-volatile memory; It relates to display driver devices that write to registers.

Another aspect of the present invention is:
A display driver device,
A display driver for driving the electro-optic panel;
A non-volatile memory connected to the display driver and storing a plurality of parameter data in each of a plurality of areas;
Including
The display driver is
A parameter register circuit for storing the plurality of parameter data;
A control circuit for controlling the electro-optic panel based on the plurality of parameter data stored in the parameter register circuit;
In a given operation mode of a plurality of operation modes, at a given timing, the nonvolatile memory is stored in a given area corresponding to the given operation mode. A register writing circuit for writing the plurality of parameters to the parameter register;
This relates to a display driver device.

Another aspect of the present invention is a display driver device,
A display driver for driving the electro-optic panel;
A processing device connected to the display driver and capable of transmitting and receiving data to and from the display driver;
An external non-volatile memory connected to the processor and storing data;
Including
The display driver is
A decoder circuit for decoding command data;
A parameter register circuit for storing a plurality of parameter data;
A control circuit for controlling the electro-optic panel based on the plurality of parameter data stored in the parameter register circuit;
An internal nonvolatile memory circuit for storing a part of the plurality of parameter data;
An internal memory control circuit for controlling writing to and reading from the internal nonvolatile memory circuit;
Have
When a writing device is connected to the display driver instead of the processing device, the internal memory control circuit relates to the part of the plurality of parameter data from the writing device according to a decoding result of the decoding circuit. , Controlling writing to the internal nonvolatile memory circuit,
When the processing device is connected to the display driver instead of the writing device, the internal memory control circuit, according to the decoding result of the decoding circuit, the plurality of parameters stored in the internal nonvolatile memory circuit Controlling the reading of the part of the data to the processing device;
The processor is
A processing circuit for generating command data;
A transmission circuit for transmitting the command data;
A receiving circuit for receiving the part of the plurality of parameter data stored in the internal nonvolatile memory circuit from the display driver;
An external memory control circuit that controls writing to the external nonvolatile memory with respect to the part of the plurality of parameter data received by the receiving circuit and the other part of the plurality of parameter data;
This relates to a display driver device.

In another aspect of the present invention, the external memory control circuit controls reading of the part and the other part of the plurality of parameter data stored in the external memory write circuit at a given timing. You may,
The transmission circuit may transmit the part of the plurality of parameter data and the other part to the display driver,
The display driver is
A register writing circuit may be further included that writes the part of the plurality of parameter data and the other part to the parameter register circuit according to the given timing.

Another aspect of the present invention is:
The present invention relates to an electro-optical device including any one of the display drivers described above.

Another aspect of the present invention is:
The present invention relates to an electro-optical device including any one of the display driver devices described above.

Another aspect of the present invention is a method of setting a plurality of parameter data in a display driver,
Storing a part of the plurality of parameter data in a first nonvolatile memory circuit of the display driver;
The part of the plurality of parameter data stored in the first nonvolatile memory circuit and the plurality of parameter data stored in a second nonvolatile memory outside the display driver at a given timing The other part is related to the method of writing the parameter register of the display driver.

According to another aspect of the present invention, there is provided a method for setting a plurality of parameter data in a display driver,
A given area of a non-volatile memory connected to the outside of the display driver at a given timing in a given operation mode of a plurality of operation modes, corresponding to the given operation mode It relates to a method of writing the plurality of parameter data stored in the given area to the parameter register of the display driver.

According to another aspect of the present invention, there is provided a method for setting a plurality of parameter data in a display driver,
Storing a part of the plurality of parameter data from a writing device in an internal nonvolatile memory circuit;
Transmitting the part of the plurality of parameter data stored in the internal nonvolatile memory circuit to a processing device;
Storing the part of the plurality of parameter data from the processing device and the other part of the plurality of parameter data in an external nonvolatile memory connected to the processing device;
The method relates to a method of writing the part and the other part of the plurality of parameter data stored in the external nonvolatile memory to the parameter register of the display driver via the processing device at a given timing. .

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unduly limit the contents of the present invention described in the claims. Also, not all of the configurations described below are essential constituent requirements of the present invention.

1. FIG. 1 shows a configuration example of an electro-optical device according to this embodiment. The electro-optical device includes, for example, the display driver 10, the electro-optical panel 512, and the treatment device 130 illustrated in FIG. The electro-optical device includes an external nonvolatile memory 134 located outside the display driver 10. In FIG. 1, the external nonvolatile memory 134 is connected to the display driver 10. However, when the number of external terminals of the display driver 10 is limited, the external nonvolatile memory 134 may be connected to the treatment device 130. The display driver 10 includes an internal nonvolatile memory circuit 546. The electro-optical panel 512 is driven by the display driver 10. The range of the electro-optical device includes, for example, a vehicle-mounted display unit. The display driver 10 may omit some of the plurality of circuits illustrated in FIG. The display driver 10 may include a circuit not shown in FIG. Furthermore, each circuit in the display driver 10 may omit some of the plurality of functions and may include other functions. A part or all of the display driver 10, the treatment device 130, and the external nonvolatile memory 134 may be formed on the electro-optical panel 512.

  In FIG. 1, an electro-optical panel 512 includes a plurality of data lines (source lines), a plurality of scanning lines (gate lines), and any one of a plurality of data lines and a plurality of scanning lines. And a plurality of pixels specified by the scanning line. A display operation is realized by changing the optical characteristics of an electro-optical element (for example, a liquid crystal element) in each pixel region. Although 1 × 2 pixels are shown in FIG. 1, the number of pixels is not limited to two. The electro-optical panel 512 has, for example, 320 × 320 pixels. Further, the electro-optical panel 512 can be configured by an active matrix type panel using a switching element such as a TFT (Thin Film Transistor), a TFD (Thin Film Diode) or the like. The electro-optical panel 512 may be a panel other than the active matrix system (for example, a simple matrix system panel) or a panel other than the liquid crystal panel (for example, an organic EL (Electro Luminescence) panel). Good.

  More specifically, the liquid crystal panel is formed on a panel substrate made of, for example, a glass substrate. A plurality of scanning lines and a plurality of data lines are arranged on the panel substrate. Pixels are provided at positions corresponding to intersections between any one of the plurality of scanning lines and any one of the plurality of data lines. Each pixel has a switching element made of, for example, an amorphous Si-TFT and a pixel electrode.

  The gate electrode of the TFT is connected to one of the plurality of scanning lines. The source electrode of the TFT is connected to one of the data lines. The drain electrode of the TFT is connected to any one of the plurality of pixel electrodes. A liquid crystal capacitor (element capacitance in a broad sense) is formed between the pixel electrode and a counter electrode (common electrode) that faces the pixel electrode via a liquid crystal element (electro-optical material in a broad sense). Note that a storage capacitor may be formed in parallel with the liquid crystal capacitor. In the liquid crystal panel, the transmittance of the pixel changes according to the voltage between the pixel electrode and the counter electrode. The common electrode voltage VCOM supplied to the common electrode is generated by the power supply circuit 590. In such a liquid crystal panel, for example, a first substrate on which a pixel electrode and a TFT are formed and a second substrate on which a counter electrode is formed are bonded together, and liquid crystal as an electro-optical material is sealed between the two substrates. It is formed by letting. The range of element capacitance includes liquid crystal capacitance formed in a liquid crystal element and capacitance formed in an EL element such as an inorganic EL element.

  A storage circuit 522 (for example, RAM (Random Access Memory)) stores image data. The memory circuit 522 includes a plurality of memory cells and stores image data (display data) for at least one frame (one screen). When the electro-optical panel 512 has 320 × 320 pixels, the storage capacity of the storage circuit 522 is, for example, 320 × 320 × 4 bits. In this case, the storage circuit 522 stores 4 bits (16 gradations) of image data for one frame, 2 bits (4 gradations) of image data for 2 frames, or 4 frames. One-bit (two gradations) image data can be stored. The storage capacity of the storage circuit 522 may be larger than 320 × 320 × 4 bits, and the storage circuit 522 may store 4 bits (16 gradations) of image data for a plurality of frames. Image data stored in the storage circuit 522 is written or read by the writing circuit 526 and the reading circuit 524, for example. Note that a part of the storage circuit 522 may be a ROM (Read Only Memory) that stores fixed image data.

  The writing circuit 526 writes the image data from the processing device 130 to the storage circuit 522, but the writing circuit 526 may be a writing / reading circuit 526 that also has a function of reading the image data from the storage circuit 522 to the processing device 130. Good. The read circuit 524 reads the image data from the storage circuit 522 to the data driver circuit 550. The write circuit 526 (write / read circuit 526) includes, for example, a page address control circuit that controls a page address and a column address control circuit that controls a column address. The writing circuit 526 (writing / reading circuit 526) may include a buffer circuit that temporarily stores image data. The read circuit 524 includes, for example, a line address control circuit that controls line addresses (and a column address control circuit that controls column addresses as necessary). The reading circuit 524 may include a latch circuit that temporarily holds image data.

  The control logic circuit 542 generates various control signals and various control data, and controls the entire display driver 10. The control logic circuit 542 can be formed by automatic placement and routing such as a gate array (G / A). The control logic circuit 542 holds parameter data and command data. Further, the control logic circuit 542 adjusts gradation characteristics (γ characteristics) for adjusting gradation characteristics (γ characteristics) with respect to the gradation voltage generation circuit 610 (in a broad sense, the gradation signal generation circuit). Or voltage setting data for adjusting various voltages to the power supply circuit 590. The control logic circuit 542 controls access to an external nonvolatile memory 134 (for example, EEPROM (Electrically Erasable and Programmable ROM)) connected to the display driver 10. The control logic circuit 542 controls access to a nonvolatile memory circuit 546 (for example, a multi-time programmable ROM (multi-ROM)) inside the display driver 10. In addition, the control logic circuit 542 transmits and receives signals and data to and from the processing device 130 (for example, an MPU (Micro Processing Unit)). Note that the control logic circuit 542 may receive a reference clock from the processing device 130, and the display driver 10 may include an oscillation circuit that generates the reference clock. The control logic circuit 542 may receive a vertical synchronization signal or a horizontal synchronization signal from the processing device 130, and the display driver 10 may include a circuit that generates a vertical synchronization signal or a horizontal synchronization signal.

  The display timing control circuit 544 generates a display timing control signal, controls the writing timing of image data from the processing device 130 to the storage circuit 522, and reads out image data from the storage circuit 522 to the data driver circuit 550. To control. In addition, the display timing control circuit 544 generates a polarity inversion signal POL that specifies the timing at which the polarity of the applied voltage (applied signal in a broad sense) of the electro-optic material is inverted. This is sent to the regulated voltage generation circuit 610.

  The system interface circuit 548 realizes an interface that receives signals and data from the processing device 130 to the display driver 10 and sends signals and data from the display driver 10 to the processing device 130. The system interface circuit 548 may use a bus holder circuit that temporarily holds image data for communication of image data between the processing device 130 and the storage circuit 522. The system interface circuit 548 may be a parallel interface circuit, a serial interface circuit, or a parallel / serial interface circuit. The parallel interface circuit 548 handles, for example, an inverted chip select signal XCS, a command / data identification signal A0, an inverted read signal XRD, an inverted write signal XWR, and 8-bit data D7 to D0. The serial interface circuit handles, for example, an inverted chip select signal XCS, a command / data identification signal A0, a serial clock signal SCL, and serial data SD. The parallel / serial interface circuit includes, for example, a serial / parallel selection signal IF, an inverted chip select signal XCS, a command / data identification signal A0, an inverted read signal XRD, an inverted write signal XWR, 8-bit data D7 to D0, and a serial clock. Handles the signal SCL and the serial data SD.

  “H (High level)” and “L (Low level)” of the serial / parallel selection signal IF indicate, for example, a serial communication mode and a parallel communication mode, respectively. For example, “L” of the inverted chip select signal XCS indicates permission of communication between the processing device 130 and the display driver 10. “H” and “L” of the command / data identification signal A0 indicate, for example, a communication mode of image data or parameter data and a communication mode of command data, respectively. “L” of the inverted read signal XRD in the parallel communication mode indicates, for example, reading of data from the display driver 10 to the processing device 130. “L” of the inverted write signal XWR in the parallel communication mode indicates, for example, data writing from the processing device 130 to the display driver 10. The 8-bit data D7 to D0 in the parallel communication mode indicates, for example, image data, parameter data, or command data. The serial clock signal SCL in the serial communication mode indicates a clock for communication between the processing device 130 and the display driver 10. The serial data SD in the serial communication mode indicates, for example, image data, parameter data, or command data.

  The data driver circuit 550 is a circuit that generates data signals (data line drive signals) for driving a plurality of data lines of the electro-optical panel 512. Specifically, the data driver circuit 550 receives image data (gradation data) from the storage circuit 522, and a plurality of (for example, 16 steps, 4 steps, 2 steps, etc.) gradation voltages (references) from the gradation voltage generation circuit 610. Voltage) (a gradation signal in a broad sense). Then, the data driver circuit 550 selects a gradation voltage corresponding to the image data from a plurality of gradation voltages. The selected gradation voltage is output as a data signal to a corresponding data line among the plurality of data lines of the electro-optical panel 512.

  The data driver circuit 550 can employ polarity inversion driving that inverts the polarity of the applied voltage (applied signal in a broad sense) of the electro-optic material in order to prevent the electro-optic material from deteriorating. The polarity inversion driving is a frame inversion driving that performs polarity inversion in units of one vertical scanning period, a line inversion driving that performs polarity inversion in units of one horizontal scanning period, and a dot inversion driving that performs polarity inversion in units of one pixel. Polarity inversion driving combined with the above. When the data driver circuit 550 employs polarity inversion driving, the data driver circuit 550 selects a gradation voltage corresponding to image data (gradation data) in synchronization with the polarity inversion signal POL. Specifically, the data driver circuit 550 inverts each bit of the image data (gradation data) in synchronization with the polarity inversion signal POL to generate inverted image data (inversion gradation data). The data driver circuit 550 selects a gradation voltage corresponding to the image data or the inverted image data from the plurality of gradation voltages based on the polarity inversion signal POL.

  The scanning driver circuit 570 is a circuit that generates a scanning signal (scanning line driving signal) for driving a plurality of scanning lines of the electro-optical panel 512. Specifically, the start pulse signal is sequentially shifted in a built-in shift register, and the level of the shifted start pulse signal is converted. The level-converted signal is output as a scanning signal (scanning voltage) to a corresponding scanning line among the plurality of scanning lines of the electro-optical panel 512. The scan driver 570 includes a scan address generation circuit and an address decoder. The scan address generation circuit generates and outputs a scan address, and the address decoder performs a scan address decoding process to generate a scan signal. Also good.

  The power supply circuit 590 is a circuit that generates various voltages (power supply signals in a broad sense). The power supply circuit 590 boosts the input power supply voltage and the internal power supply voltage by a charge pump method using a boosting capacitor and a boosting transistor, and generates a boosted voltage. Based on the boosted voltage, a high voltage used by the scan driver circuit 570 and the gradation voltage generation circuit 610 can be generated. The power supply circuit 590 adjusts the level of the boosted voltage. The power supply circuit 590 also generates a counter electrode voltage VCOM that is supplied to the counter electrode of the electro-optical panel 512.

  The gradation voltage generation circuit (γ correction circuit) 610 is a circuit that generates a plurality of gradation voltages. Specifically, the grayscale voltage generation circuit 610 generates selection voltages VS1 to VS64 (R selection voltages in a broad sense) based on the high-voltage power supply voltages VDDH and VSSH generated by the power supply circuit 590. Output. The gradation voltage generation circuit 610 includes a ladder resistance circuit having a plurality of resistance elements connected in series. Then, voltages obtained by dividing VDDH and VSSH by the ladder resistor circuit are output as selection voltages VS1 to VS64. Based on the gradation characteristic adjustment data from the control logic circuit 542, the gradation voltage generation circuit 610 includes, for example, 16 selection voltages VS1 to VS64 in the case of 16 gradations (S in a broad sense). R> S) is selected and output as gradation voltages V1 to V16. In this way, it is possible to generate a gradation voltage having an optimum gradation characteristic (γ correction characteristic) according to the electro-optical panel. In the case of polarity inversion driving, the gradation voltage generation circuit 610 may include a ladder resistor circuit for positive polarity and a ladder resistor circuit for negative polarity. In other words, the gradation voltage generation circuit 610 is synchronized with the polarity inversion signal POL, and a plurality of positive polarity (for example, 16 levels) gradation voltages V1 to V16 or a plurality of negative polarity (for example, 16 levels) gradations. The voltages V1 to V16 may be output.

  The processing device 130 transmits and receives signals and data to and from the control logic circuit 542. The processing device 130 may be realized by an MPU or CPU (Central Processing Unit), or may be realized by a controller circuit that is an ASIC. In addition, a processing unit (for example, an electro-optical device, a mobile phone, a pager, a clock, a liquid crystal television, an in-vehicle display device, a car navigation device, a calculator, a word processor, a projector, or a POS terminal) having the functions of the MPU 130. MPU) may be realized.

  The main operation of the processing device 130 is to send command data to the control logic circuit 542, and the control logic circuit 542 controls the display driver 10 based on the command data. Further, the processing device 130 transmits parameter data related to command data as necessary. Another main operation of the processing device 130 is to send image data to the storage circuit 522. Specifically, the processing device 130 instructs the control logic circuit 542 to write a write area (for example, a storage area for one frame) of the storage circuit 522, and the contents of the write area. Parameter data representing (for example, the start address and end address of the storage area for one frame) is transmitted to the control logic circuit 542. Thereafter, the processing device 130 starts transmitting image data (for example, image data for one frame) to the storage circuit 522, and in response to this, the control logic circuit 542 sets the write area set in the storage circuit 522. The writing of image data is started via the writing circuit 526. When starting transmission of image data (for example, image data for one frame), the processing device 130 may transmit command data instructing to start writing image data to the control logic circuit 542.

  The external nonvolatile memory 134 stores various information for operating the electro-optical device. Specifically, the external nonvolatile memory 134 stores display characteristic control parameter data (display control parameter data, gradation control parameter data, voltage setting parameter data, etc.). The external nonvolatile memory 134 also stores parameter data (refresh period parameter data, manufacturing information parameter data, etc.) other than the display characteristic control parameter data. Various parameter data stored in the external nonvolatile memory 134 is read by the control logic circuit 542 at power-on, system reset, or refresh, for example.

  The internal nonvolatile memory circuit 546 stores display characteristic control parameter data (for example, flicker adjustment parameter data, contrast adjustment parameter data, etc.) set according to the characteristics of the electro-optical panel 512. Such parameter data is a value adjusted at the time of shipment and inspection of the electro-optical device in a state where the display driver 10 and the electro-optical panel 512 are connected. The flicker adjustment parameter data is, for example, offset data for offset adjustment of the high-potential-side counter electrode voltage VCOMH electronic volume. Various parameter data stored in the internal nonvolatile memory circuit 546 is read by the control logic circuit 542 at power-on, system reset, or refresh, for example.

  FIG. 2 shows a setting example of a nonvolatile memory used in a conventional display driver. FIG. 2A shows a conventional display driver using an external nonvolatile memory, and FIG. 2B shows a conventional display driver using an internal nonvolatile memory circuit. As shown in FIG. 2 (A) or 2 (B), when setting (programming) various parameter data in the external nonvolatile memory or the internal nonvolatile memory, the empty external nonvolatile memory or the empty internal nonvolatile memory There was a need to prepare memory. In addition, it is necessary to prepare a display driver, an electro-optical panel, and a processing apparatus. In other words, in the assembled state as the electro-optical device, the parameter data set according to the characteristics of the electro-optical panel is adjusted, and then the adjusted parameter data and other parameter data are transferred to the external nonvolatile memory or the internal nonvolatile memory. It was necessary to set it in the batch memory. Since adjustment of parameter data set according to the characteristics of the electro-optic panel requires a certain amount of time, the production process of the external nonvolatile memory or the internal nonvolatile memory as a whole is inefficient.

  As shown in FIG. 1, the electro-optical device according to this embodiment includes an internal nonvolatile memory circuit 546 that records parameter data set according to the characteristics of the electro-optical panel 512, and an external nonvolatile memory that stores other parameters. And a memory 134. Since the external non-volatile memory 134 stores parameters common to all the electro-optical panels 512, the setting of the external non-volatile memory 134 (program) does not require the electro-optical panel 512. Therefore, only the external nonvolatile memory 134 can be set independently, and the production efficiency of the external nonvolatile memory 134 can be improved.

2. Control Logic Circuit FIG. 3 shows a configuration example of the control logic circuit 542 in FIG. The control logic circuit 542 includes a command decoder circuit 514 that decodes command data from the processing device 130, and a parameter register circuit 30 that stores parameter data from the processing device 130. The control logic circuit 542 receives image data from the processing device 130 and sends the image data to the writing circuit 526. In FIG. 3, the system interface circuit 548 handles the inverted chip select signal XCS, the command / data identification signal A0, the inverted read signal XRD, the inverted write signal XWR, and the 8-bit data D7 to D0. Represents the function of the parallel interface circuit.

  The main operation of the control logic circuit 542 is to receive various command data from the processing device 130 and control the control circuits 524, 526, 544, 590, 610 in the display driver 10 according to the contents of the command data. . As shown in FIG. 3, the control logic circuit 542 may include a command register circuit 515 that holds that various types of command data have been input. The control logic circuit 542 receives various parameter data from the processing device 130 and stores the parameter data in the parameter register circuit 30. As illustrated in FIG. 3, the control logic circuit 542 may include a register write circuit 20 that stores parameter data related to command data in the parameter register circuit 30 in accordance with the decoding result of the command decoder circuit 514. Control circuits 524, 526, 544, 590, and 610 in the display driver 10 operate based on parameter data stored in the parameter register circuit 30. Control register circuits such as the command register circuit 515 and the parameter register circuit 30 may be realized by a holding circuit such as a D flip-flop, or may be realized by a memory circuit such as a RAM. The command register circuit 515 and the parameter register circuit 30 may be integrated as a control register circuit, and the control register circuit may be divided into an area for command data and an area for parameter data.

  In FIG. 3, the system interface circuit 548 handles an inverted reset signal XRES indicating, for example, “L” at power-on or system reset, and the control logic circuit 542 is stored in the external nonvolatile memory 134 based on the inverted reset signal XRES. And an external memory control circuit 518 for controlling reading of all parameter data. The external memory control circuit 518 transmits control data for controlling the start of reading to the external nonvolatile memory 134.

  The system interface circuit 548 handles, for example, the inverted chip select signal XE2CS, the serial clock signal E2SCL, and the serial output data E2SO for the external nonvolatile memory 134. “L” of the inverted chip select signal XE2CS indicates permission of communication between the external nonvolatile memory 134 and the display driver 10, for example. The serial clock signal E2SCL in the serial communication mode indicates a clock for communication between the external nonvolatile memory 134 and the display driver 10. The serial output data E2SO in the serial communication mode indicates control data from the display driver 10 to the external nonvolatile memory 134. Further, the system interface circuit 548 handles, for example, serial input data E2SI. The serial input data E2SO in the serial communication mode indicates parameter data or control data from the external nonvolatile memory 134 to the display driver 10.

  When the external nonvolatile memory 134 receives control data for controlling the start of reading from the external memory control circuit 518, the external nonvolatile memory 134 starts reading all the parameter data stored in the external nonvolatile memory 134. The register write circuit 20 can write parameter data from the external nonvolatile memory 134 to the parameter register circuit 30.

  In FIG. 3, the control logic circuit 542 includes an internal memory control circuit 519 that controls reading of all parameter data stored in the internal nonvolatile memory circuit 546 at power-on or system reset. The internal memory control circuit 519 transmits control data for controlling the start of reading to the internal nonvolatile memory circuit 546.

  When the internal nonvolatile memory circuit 546 receives control data for controlling the start of reading from the internal memory control circuit 519, the internal nonvolatile memory circuit 546 starts reading all of the parameter data stored in the internal nonvolatile memory circuit 546. The register writing circuit 20 can write the parameter data from the internal nonvolatile memory circuit 546 to the parameter register circuit 30.

  The parameter register circuit 30 includes parameter data set only by the processing device 130, parameter data set by the external nonvolatile memory 134, and parameter data set by the internal nonvolatile memory circuit 546. Therefore, all of the parameter data stored in the external nonvolatile memory 134 is a part of the parameter data stored in the parameter register circuit 30. All of the parameter data stored in the internal nonvolatile memory circuit 546 is another part of the parameter data stored in the parameter register circuit 30. The parameter data set only by the processing device 130 is, for example, parameter data (column address contents) for setting the column address of the write area of the storage circuit 522. The parameter data set by the external nonvolatile memory 134 is, for example, gradation adjustment data (γ correction data) for adjusting gradation characteristics (γ characteristics). The parameter data set by the internal nonvolatile memory circuit 546 is, for example, offset data for adjusting the offset of the counter electrode voltage VCOMH electronic volume on the high potential side.

  In this way, the register write circuit 20 displays all of the parameter data stored in the external nonvolatile memory 134 and all of the parameter data stored in the internal nonvolatile memory circuit 546 at a given timing. Ten parameter register circuits 30 can be written. The given timing may be a refresh time other than when the power is turned on or when the system is reset. The external memory control circuit 518 and the internal memory control circuit 519 periodically send control data for controlling the start of reading to the external nonvolatile memory 134 and the internal nonvolatile memory circuit 546 based on the refresh period parameter data stored in the parameter register 30. May be transmitted automatically. In response to this, the register write circuit 20 sends all the parameter data stored in the external nonvolatile memory 134 and all the parameter data stored in the internal nonvolatile memory circuit 546 to the display driver 10 at the time of refresh. The parameter register circuit 30 can be periodically written.

3. External Nonvolatile Memory and Internal Nonvolatile Memory Circuit In the normal operation mode of the display driver 10, the external nonvolatile memory 134 and the internal nonvolatile memory circuit 546 shown in FIG. However, the external nonvolatile memory 134 and the internal nonvolatile memory circuit 546 shown in FIG. 1 do not have to be written with initial values like the external nonvolatile memory and the internal nonvolatile memory circuit shown in FIG. . In such a case, the conventional processing apparatus of FIG. 2 requires dedicated software for writing an initial value to the external nonvolatile memory or the internal nonvolatile memory circuit.

  The processing apparatus 130 in FIG. 1 may not include such dedicated software. Instead, the external memory control circuit 518 of the display driver 10 controls the writing to the external nonvolatile memory 134 with respect to the parameter data stored in the parameter register circuit 30, as shown in FIG. In this case, the processing device 130 need only transmit command data indicating automatic writing to the external nonvolatile memory 134 to the display driver 10. Further, as shown in FIG. 3, the internal memory control circuit 519 of the display driver 10 controls the writing of the parameter data stored in the parameter register circuit 30 to the internal nonvolatile memory circuit 546. In this case, the processing device 130 only needs to transmit command data indicating automatic writing to the internal nonvolatile memory circuit 546 to the display driver 10. In this way, the burden on the processing device 130 can be reduced.

  When the initial value is not written in the external non-volatile memory 134 or the internal non-volatile memory circuit 546, the processing device 130 stores various parameter data (for example, display control parameter data, gradations) to be stored in the external non-volatile memory 134. Control parameter data, voltage setting parameter data, refresh period parameter data, manufacturing information parameter data, etc.) can be written into the parameter register circuit 30. Further, the processing device 130 can write various parameter data (for example, flicker adjustment parameter data, contrast adjustment parameter data, etc.) to be stored in the internal nonvolatile memory circuit 546 in the parameter register circuit 30.

  For example, the processing device 130 sends the command data DISAR for setting the area of the electro-optical panel 512 and the parameter data indicating the contents (for example, the number of lines and the number of columns) to the control logic circuit 542 (command decoder circuit 514, register The data is transmitted to the writing circuit 20 and the parameter register circuit 30). The command decoder circuit 514 decodes command data from the processing device 130. When the decoding result indicates the command data DISAR, the command decoder circuit 514 permits the command register circuit 515 to hold that the command data DISAR is input. The register writing circuit 20 receives parameter data (contents of the area of the electro-optical panel 512 (eg, 320 lines, 320 columns)) from the processing device 130 in accordance with the command contents held by the command register circuit 515. Write to the corresponding area of. In this way, all the various parameter data to be stored in the external nonvolatile memory 134 is written in the parameter register circuit 30.

  For example, the processing device 130 sends command data VCMDAT for setting VCOMH offset data and parameter data representing the contents of the offset data (for example, VCOMH correction value 1, VCOMH correction value 2) to the control logic circuit 542 (command decoder circuit). 514, register write circuit 20, parameter register circuit 30). The command decoder circuit 514 decodes command data from the processing device 130. When the decoding result indicates the command data VCMDAT, the command decoder circuit 514 permits the command register circuit 515 to hold that the command data VCMDAT is input. The register write circuit 20 receives the parameter data (VCOMH offset data (for example, VCOMH correction value 1 and VCOMH correction value 2)) from the processing device 130 in accordance with the command content held by the command register circuit 515. Write to the corresponding area of. In this way, all the various parameter data to be stored by the internal nonvolatile memory circuit 546 is written into the parameter register circuit 30.

  After storing various parameter data to be stored in the external nonvolatile memory 134 and the internal nonvolatile memory circuit 546 in the parameter register circuit 30, the processing unit 130 controls command data indicating automatic writing to the external nonvolatile memory 134. The command data is transmitted to the logic circuit 542 (external memory control circuit 518), and command data indicating automatic writing to the internal nonvolatile memory circuit 546 is transmitted to the control logic circuit 542 (internal memory control circuit 519).

  In accordance with the decoding result of the command decoder circuit 514 (automatic writing to the external nonvolatile memory 134), the external memory control circuit 518 controls the control data for controlling the start of writing and various parameters to be stored in the external nonvolatile memory 134. Data is transmitted to the external nonvolatile memory 134. When the external nonvolatile memory 134 receives control data for controlling the start of writing from the external memory control circuit 518, the external nonvolatile memory 134 writes all the various parameter data to be stored in the external nonvolatile memory 134. Start. In this way, the external memory control circuit 518 writes the initial value from the parameter register circuit 30 in the external nonvolatile memory 134.

  In accordance with the decoding result of the command decoder circuit 514 (automatic writing to the internal nonvolatile memory circuit 546), the internal memory control circuit 519 controls the control data for controlling the start of writing and various types of data that the internal nonvolatile memory circuit 546 should store. Parameter data is transmitted to the internal nonvolatile memory circuit 546. When the internal non-volatile memory circuit 546 receives control data for controlling the start of writing from the internal memory control circuit 519, the internal non-volatile memory circuit 546 displays all the various parameter data that the internal non-volatile memory circuit 546 should store. Start writing. In this way, the internal memory control circuit 519 writes the initial value from the parameter register circuit 30 into the internal nonvolatile memory circuit 546.

  When the external memory control circuit 518 writes the initial value from the parameter register circuit 30 to the external nonvolatile memory 134, the external memory control circuit 518 not only stores various parameter data to be stored in the external nonvolatile memory 134. Various parameter data to be stored in the internal nonvolatile memory circuit 546 may also be transmitted to the external nonvolatile memory 134. The external nonvolatile memory 134 in which the initial value is written in this way also has a function of the internal nonvolatile memory circuit 546. In other words, the display driver 10 may implement the first mode using the external nonvolatile memory 134 and the internal nonvolatile memory circuit 546, and implement the second mode using the external nonvolatile memory 134. Also good. That is, when writing the display characteristic control parameter data set according to the characteristic of the electro-optical panel 512 at a given timing to the parameter register circuit 30, the internal nonvolatile memory circuit 546 may be used in the first mode. The external nonvolatile memory 134 may be used in the second mode.

4). External Nonvolatile Memory FIG. 4 shows a configuration example of the external nonvolatile memory 134 that can support a plurality of operation modes. In FIG. 4, the external nonvolatile memory 134 has four areas corresponding to four operation modes, and each area includes, for example, display control parameter data, gradation control parameter data, voltage setting parameter data, refresh period parameters. Data, manufacturing information parameter data, etc. are stored. For example, the four operation modes are a first daytime mode, a second daytime mode, a first night mode, and a second night mode. Depending on each operation mode, the external non-volatile memory 134 can have optimal parameter data. Thus, when the external nonvolatile memory 134 corresponds to a plurality of operation modes, the parameter register circuit 30 can store a given operation mode among the plurality of operation modes. A given operation mode can be set in the parameter register circuit 30 as parameter data from the processing device 130, for example. At a given timing, the external memory control circuit 518 transmits control data for controlling the start of reading to the external non-volatile memory 134 and parameter data corresponding to a given operation mode (for example, the external non-volatile memory 134). The start address (e.g., 080 (h)) is transmitted to the external nonvolatile memory 134. Thus, the register write circuit 20 displays the display control parameter data and gradation corresponding to the given operation mode at the given timing. Control parameter data, voltage setting parameter data, refresh period parameter data, manufacturing information parameter data, etc. can be written to the parameter register circuit 30. The display driver 10 does not need to use the internal nonvolatile memory circuit 546. .

5). Electro-Optical Device In FIG. 1, when the number of external terminals of the display driver 10 is limited, the external nonvolatile memory 134 is connected to the treatment device 130. In addition, a writing device may be prepared to write the initial value to the empty internal nonvolatile memory circuit 546 in the display driver 10.

  FIG. 5 shows a setting example of the external nonvolatile memory 134 used for the display driver 10. FIG. 5A shows the display driver 10 connected to the writing device 129, and FIG. 5B shows the display driver 10 connected to the processing device 130. As shown in FIG. 5A, the initial values are not written in the external nonvolatile memory 134 and the internal nonvolatile memory circuit 546.

  The display driver 10 and the writing device 129 are connected, and the initial value is written in the empty internal nonvolatile memory circuit 546. Specifically, the writing device 129 transmits display characteristic control parameter data to the display driver 10 and sets the display characteristic control parameter data according to the characteristics of the electro-optical panel 512. In other words, the writing device 129 determines optimal display characteristic control parameter data. Thereafter, the writing device 129 controls the command data indicating the start of writing to the internal nonvolatile memory circuit 546 and various parameter data (the determined optimum display characteristic control parameter data) to be stored by the internal nonvolatile memory circuit 546. The data is transmitted to the logic circuit 542 (command decoder circuit 514, internal memory control circuit 519). The internal memory control circuit 519 writes the received parameter data to the internal nonvolatile memory circuit 546 according to the decoding result of the command decoder circuit 514 (start of writing to the internal nonvolatile memory circuit 546). In this way, the initial value is written in the internal nonvolatile memory circuit 546.

  The connection between the display driver 10 and the writing device 129 is released, and the display driver 10 and the processing device 130 are connected. The processing device 130 reads out various parameter data stored in the internal nonvolatile memory circuit 546. Specifically, the processing device 130 transmits command data indicating the start of reading from the internal nonvolatile memory circuit 546 to the control logic circuit 542 (command decoder circuit 514, internal memory control circuit 519). In response to the decoding result of the command decoder circuit 514 (start of reading from the internal nonvolatile memory circuit 546), the internal memory control circuit 519 sends various parameter data read from the internal nonvolatile memory circuit 546 to the processing device 130. Send.

  As shown in FIG. 5B, the display driver 10 and the external nonvolatile memory 134 are connected, and the initial value is written in the empty external nonvolatile memory 134. Specifically, the processing device 130 receives various parameter data read from the internal nonvolatile memory circuit 546 and prepares other various parameter data to be stored in the external nonvolatile memory 134. The processing device 130 stores control data for controlling the start of writing and various parameter data to be stored in the external nonvolatile memory 134 (various received parameter data and various other prepared parameter data). Send to. When the external non-volatile memory 134 receives control data for controlling the start of writing from the processing device 130, the external non-volatile memory 134 starts all writing of various parameter data to be stored in the external non-volatile memory 134. . In this way, the external memory control circuit 518 writes the initial value from the parameter register circuit 30 in the external nonvolatile memory 134. In this way, the initial value is written in the external nonvolatile memory 134. Thereafter, the display driver 10 may not use the internal nonvolatile memory circuit 546. Display characteristic control parameter data set according to the characteristics of the electro-optical panel 512 can be reliably transferred to the external nonvolatile memory 134 via the internal nonvolatile memory circuit 546.

  FIG. 6 shows a configuration example of the processing apparatus 130 of FIG. The processing device 130 includes a processing circuit 132 that generates command data, a transmission circuit 131 that transmits data, a reception circuit 133 that receives data, and an external memory control circuit 518 that controls writing to the external nonvolatile memory 134. Have The external memory control circuit 518 may control all reading of various parameter data stored in the external nonvolatile memory circuit at a given timing. In this case, the transmission circuit 131 transmits all of the various read parameter data to the display driver 10. The register writing circuit 20 of the display driver 10 can write all the received various parameter data into the parameter register circuit 30 according to a given timing.

  Those skilled in the art will readily understand that the above-described embodiments can be modified (possibly by referring to common general knowledge) without departing from the spirit of the present invention. The scope of the present invention includes all or part of the present embodiment and modifications thereof, and is defined by the claims and their equivalents.

1 is a configuration example of an electro-optical device according to an embodiment. 2A and 2B are setting examples of a nonvolatile memory used in a conventional display driver. 2 is a configuration example of a control logic circuit of FIG. 2 shows a configuration example of an external nonvolatile memory that can support a plurality of operation modes. 5A and 5B show setting examples of the external nonvolatile memory 134 used for the display driver. 6 is a configuration example of the processing apparatus of FIG.

Explanation of symbols

10 display driver, 20 register write circuit, 30 parameter register circuit,
129 Writing device, 130 processing device, 131 transmitting circuit, 132 processing circuit,
133 receiving circuit, 134 external nonvolatile memory, 512 electro-optical panel,
514 command decoder circuit, 515 command register circuit,
518 external memory control circuit, 519 internal memory control circuit, 522 storage circuit,
524 read circuit, 526 write circuit, 542 control logic circuit,
544 display timing control circuit, 546 internal nonvolatile memory circuit,
548 system interface circuit, 550 data driver circuit,
570 Scan driver circuit, 590 power supply circuit, 610 gradation voltage generation circuit

Claims (15)

A display driver for driving an electro-optic panel,
A parameter register circuit for storing a plurality of parameter data;
A control circuit for controlling the electro-optic panel based on the plurality of parameter data stored in the parameter register circuit;
A first nonvolatile memory circuit for storing a part of the plurality of parameter data;
The part of the plurality of parameter data stored in the first nonvolatile memory circuit and the plurality of parameter data stored in a second nonvolatile memory outside the display driver at a given timing A register writing circuit for writing the other part to the parameter register circuit;
Display driver including. In claim 1,
A decoder circuit for decoding command data from the processing device;
An external memory control circuit that controls writing to the second nonvolatile memory with respect to the other part of the plurality of parameter data stored in the parameter register circuit according to a decoding result of the decoding circuit;
Further including a display driver. In claim 2,
An internal memory control circuit for controlling writing to the first nonvolatile memory circuit with respect to the part of the plurality of parameter data stored in the parameter register circuit according to a decoding result of the decoding circuit; Display driver. In claim 2 or 3,
The external memory control circuit controls writing to the second nonvolatile memory with respect to the part of the plurality of parameter data stored in the parameter register circuit according to a decoding result of the decoding circuit,
In the first mode, the register writing circuit has the part of the plurality of parameter data stored in the first nonvolatile memory circuit at a given timing, and a second outside the display driver. Writing the other part of the plurality of parameter data stored in the nonvolatile memory to the parameter register,
In the second mode, the register write circuit may include the part of the plurality of parameter data and the other part stored in a second nonvolatile memory outside the display driver at the given timing. A display driver for writing to the parameter register. In any one of Claims 1 thru | or 4,
The given driver is a display driver at power-on, system reset, or refresh. In any of claims 1 to 5,
The display driver, wherein the part of the plurality of parameter data is parameter data set according to characteristics of the electro-optical panel. A display driver device,
The display driver according to any one of claims 1 to 6,
The second nonvolatile memory storing the other part of the plurality of parameter data in each of a plurality of regions;
Including
The register write circuit includes the part of the plurality of parameter data stored in the first nonvolatile memory circuit at the given timing in a given operation mode of the plurality of operation modes; The other part of the plurality of parameter data stored in the given area corresponding to the given operation mode in the given area of the second non-volatile memory; A display driver device that writes to a register. A display driver device,
A display driver for driving the electro-optic panel;
A non-volatile memory connected to the display driver and storing a plurality of parameter data in each of a plurality of areas;
Including
The display driver is
A parameter register circuit for storing the plurality of parameter data;
A control circuit for controlling the electro-optic panel based on the plurality of parameter data stored in the parameter register circuit;
In a given operation mode of a plurality of operation modes, at a given timing, the nonvolatile memory is stored in a given area corresponding to the given operation mode. A register writing circuit for writing the plurality of parameters to the parameter register;
A display driver device. A display driver device,
A display driver for driving the electro-optic panel;
A processing device connected to the display driver and capable of transmitting and receiving data to and from the display driver;
An external non-volatile memory connected to the processor and storing data;
Including
The display driver is
A decoder circuit for decoding command data;
A parameter register circuit for storing a plurality of parameter data;
A control circuit for controlling the electro-optic panel based on the plurality of parameter data stored in the parameter register circuit;
An internal nonvolatile memory circuit for storing a part of the plurality of parameter data;
An internal memory control circuit for controlling writing to and reading from the internal nonvolatile memory circuit;
Have
When a writing device is connected to the display driver instead of the processing device, the internal memory control circuit relates to the part of the plurality of parameter data from the writing device according to a decoding result of the decoding circuit. , Controlling writing to the internal nonvolatile memory circuit,
When the processing device is connected to the display driver instead of the writing device, the internal memory control circuit, according to the decoding result of the decoding circuit, the plurality of parameters stored in the internal nonvolatile memory circuit Controlling the reading of the part of the data to the processing device;
The processor is
A processing circuit for generating command data;
A transmission circuit for transmitting the command data;
A receiving circuit for receiving the part of the plurality of parameter data stored in the internal nonvolatile memory circuit from the display driver;
An external memory control circuit that controls writing to the external nonvolatile memory with respect to the part of the plurality of parameter data received by the receiving circuit and the other part of the plurality of parameter data;
A display driver device. In claim 9,
The processor is
The external memory control circuit controls reading of the part and the other part of the plurality of parameter data stored in the external nonvolatile memory at a given timing,
The transmission circuit transmits the part and the other part of the plurality of parameter data to the display driver,
The display driver is
A display driver device, further comprising: a register writing circuit that writes the part of the plurality of parameter data and the other part to the parameter register circuit in accordance with the given timing.   An electro-optical device including the display driver according to claim 1.   An electro-optical device including the display driver device according to claim 7. A method of setting a plurality of parameter data in a display driver,
Storing a part of the plurality of parameter data in a first nonvolatile memory circuit of the display driver;
The part of the plurality of parameter data stored in the first nonvolatile memory circuit and the plurality of parameter data stored in a second nonvolatile memory outside the display driver at a given timing A method for writing other part of the parameter to the parameter register of the display driver. A method of setting a plurality of parameter data in a display driver,
A given area of a non-volatile memory connected to the outside of the display driver at a given timing in a given operation mode of a plurality of operation modes, corresponding to the given operation mode A method of writing the plurality of parameter data stored in the given area to a parameter register of the display driver. A method of setting a plurality of parameter data in a display driver,
Storing a part of the plurality of parameter data from a writing device in an internal nonvolatile memory circuit;
Transmitting the part of the plurality of parameter data stored in the internal nonvolatile memory circuit to a processing device;
Storing the part of the plurality of parameter data from the processing device and the other part of the plurality of parameter data in an external nonvolatile memory connected to the processing device;
A method of writing the part and the other part of the plurality of parameter data stored in the external nonvolatile memory to a parameter register of the display driver via the processing device at a given timing.

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