JP2009169387A - Integrated circuit device, electro-optical device, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an integrated circuit device that is reduced in circuit scale by increasing the flexibility of layout, and to provide an electro-optical device and an electronic apparatus. <P>SOLUTION: The integrated circuit device 10 includes first to Nth memory blocks (MB1 to MB6) that are disposed along a first direction (D1), and first to Nth data driver blocks (DB1 to DB6) that are disposed along the first direction in a second direction (D2) with respect to the first to Nth memory blocks. A Jth memory block among the first to Nth memory blocks dot-sequentially reads subpixel image data being image data corresponding to at least one subpixel and outputs the subpixel image data to a corresponding Jth data driver block among the first to Nth data driver blocks. The Jth data driver block receives the subpixel image data from the Jth memory block, and outputs a data signal corresponding to the subpixel image data. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an integrated circuit device, an electro-optical device, an electronic apparatus, and the like.

  Conventionally, as an electro-optical panel used in an electronic device such as a mobile phone, a television, and a projector (projection display device), an active matrix using a simple matrix type liquid crystal panel and a switching element such as a thin film transistor (Thin Film Transistor). A liquid crystal panel of the type is known. In recent years, electro-optical panels using light emitting elements such as EL (Electro Luminescence) have also been in the limelight.

  In recent years, the number of data lines (source lines) of the electro-optical panel has increased due to the increase in the screen size of the electro-optical panel and the increase in the number of pixels. On the other hand, high precision of the voltage applied to each data line is required. Yes. Furthermore, due to the demand for low power consumption and light weight and small size of electronic devices equipped with electro-optic panels, it is required to reduce the power consumption of data drivers (source drivers) that drive data lines and to reduce the chip size. Yes.

  For example, Patent Document 1 and Patent Document 2 disclose that a rail-to-rail operation of an output circuit that drives a data line of a data driver is enabled, while a voltage is accurately applied to the data line. The structure which can supply is disclosed.

  However, in the technologies disclosed in Patent Document 1 and Patent Document 2, each output circuit is equipped with an auxiliary circuit to control the driving capability to realize rail-to-rail operation. Therefore, it is necessary to mount an auxiliary circuit as an additional circuit, and there is a problem that the circuit scale of the data driver becomes large. In addition, in order to suppress variations in voltage applied to the data line, it is necessary to increase the size of the transistor, which increases the chip size.

  Patent Document 3 discloses a technique for reducing the chip size by arranging a data driver block and a memory block adjacent to each other along the long side direction of the integrated circuit device.

However, although the technology of Patent Document 3 can realize a slim and slender chip, the circuit area of the data driver block itself increases, the wiring area of the signal line that is wired from the data driver block to the data signal pad, etc. As a result, the achievement of the chip size reduction has been insufficient.
JP 2005-175811 A JP 2005-175812 A JP 2007-243125 A

  According to some embodiments of the present invention, it is possible to provide an integrated circuit device, an electro-optical device, and an electronic apparatus that can increase the degree of freedom in layout and reduce the circuit scale.

  One embodiment of the present invention includes first to Nth (N is an integer of 2 or more) memory blocks that are arranged along a first direction and store image data, and a direction orthogonal to the first direction. In the second direction, the first to Nth memory blocks are arranged along the first direction in the second direction and supply data signals to a plurality of data lines of the electro-optical device. J-th memory block (J is an integer satisfying 1 ≦ J ≦ N) of the first to N-th memory blocks, and includes at least one sub-pixel. Sub-pixel image data, which is image data, is read out dot-sequentially and output in a time-sharing manner to the corresponding J-th data driver block among the first to N-th data driver blocks, and the J-th data Driver block , From said memory blocks of said first J receives the sub-pixel image data, related to the integrated circuit device for outputting data signals corresponding to the sub-pixel image data.

  According to one aspect of the present invention, the first to Nth memory blocks are arranged along the first direction. The first to Nth data driver blocks are arranged along the first direction in the second direction of the first to Nth memory blocks. The Jth memory block then reads the subpixel image data, for example, from the memory cell array in a dot sequence. Then, the read subpixel image data is output to the corresponding Jth data driver block in a time division manner. Then, the Jth data driver block outputs a data signal corresponding to the sub-pixel image data. In this way, it becomes possible to eliminate the mutual dependence of the positional relationship of the layout arrangement between the first to Nth memory blocks and the first to Nth data driver blocks, and the degree of freedom of the layout arrangement. The layout efficiency can be improved. As a result, an integrated circuit device capable of increasing the degree of freedom in layout and reducing the circuit scale can be provided.

  In one aspect of the present invention, data of k bits (k is a natural number) for transferring the subpixel image data in a time-sharing manner between the Jth memory block and the Jth data driver block. A transfer bus may be wired.

  In this way, for example, the subpixel image data can be transferred using a data transfer bus having a small number of bits, so that the area of the wiring region of the data transfer bus can be reduced, and the second direction of the integrated circuit device can be reduced. The width at can be reduced.

  In the aspect of the invention, the J-th memory block and the J-th data driver block may be arranged such that their center positions are shifted in the first direction.

  In this way, it becomes possible to arrange other circuits, pads, etc. in the empty area created by performing the shifted layout arrangement, and layout efficiency can be improved.

  In one embodiment of the present invention, a grayscale voltage generation circuit that generates a plurality of grayscale voltages and supplies the grayscale voltages to the first to Nth data driver blocks is provided. In this case, the gradation voltage generation circuit may be arranged in the first direction of the Nth memory block and in the fourth direction of the Nth data driver block.

  According to this configuration, the grayscale voltage generation circuit is arranged by effectively utilizing the empty area created in the first direction of the Nth memory block and in the fourth direction of the Nth data driver block. It becomes possible to improve the layout efficiency.

  In one aspect of the present invention, when a direction opposite to the first direction is a third direction, a plurality of scanning signal pads for supplying a scanning signal to the plurality of scanning lines of the electro-optical device is provided. The first memory block may be arranged in the second direction of the first memory block and in the third direction of the first data driver block.

  In this way, it is possible to arrange the scanning signal pads by effectively utilizing the empty area created in the second direction of the first memory block and in the third direction of the first data driver block. As a result, the layout efficiency can be improved.

  In one embodiment of the present invention, a first to Nth pre-latch circuit and first to Nth post-latch circuits are included, and the J-th pre-latch circuit of the first to N-th pre-latch circuits includes: The subpixel image data output in a time-sharing manner from the Jth memory block is sequentially latched, and the Jth postlatch circuit among the first to Nth postlatch circuits is the Jth prelatch circuit. After the sub-pixel image data is latched in step S1, the latched sub-pixel image data may be read out from the J-th pre-latch circuit in a line-sequential manner and latched and output to the J-th data driver block.

  If such first to Nth pre-latch circuits and first to Nth post-latch circuits are provided, for example, subpixel image data output in a time division manner from the Jth memory block is latched and latched. The subpixel image data can be efficiently transferred to the Jth data driver block.

  In one aspect of the present invention, the J-th pre-latch circuit sequentially latches the sub-pixel image data of the first color component output in a time division manner from the J-th memory block, and the J-th post After latching the first color component sub-pixel image data in the J-th pre-latch circuit, the latch circuit lines the latched first color component sub-pixel image data from the J-th pre-latch circuit. The J-th pre-latch circuit sequentially latches the sub-pixel image data of the second color component output in a time division manner from the J-th memory block, and sequentially latches the J-th pre-latch circuit. The latch circuit of the second color component is latched after the latching of the subpixel image data of the second color component in the Jth pre-latch circuit. Are read out from the J-th pre-latch circuit in a line-sequential manner, and the J-th pre-latch circuit then outputs the sub-pixel image data of the third color component output in a time division manner from the J-th memory block. Are sequentially latched, and the J-th post-latch circuit latches the sub-pixel of the third color component latched after the sub-pixel image data of the third color component is latched by the J-th pre-latch circuit. Image data may be read and latched line-sequentially from the J-th pre-latch circuit.

  According to this configuration, the first color component subpixel image data, the second color component subpixel image data, and the third color component subpixel image data are converted into the first, second, and third color components. The data can be sequentially latched in the order of components and input to the Jth data driver block.

  In the aspect of the invention, when the J-th data driver block latches the sub-pixel image data of the first color component in the J-th post-latch circuit, the latched first color When a signal corresponding to the sub-pixel image data of the component is sampled and the sub-pixel image data of the second color component is latched by the J-th post-latch circuit, the sub-pixel image of the second color component is latched. When the signal corresponding to the pixel image data is sampled and the sub-pixel image data of the third color component is latched in the J-th post-latch circuit, the latched sub-pixel image data of the third color component A signal corresponding to may be sampled.

  In this way, the J-th data driver block can sample signals corresponding to the sub-pixel image data of the first, second, and third color components that are sequentially input.

  In the aspect of the invention, the J-th data driver block outputs a data signal corresponding to at least one pixel based on the sub-pixel image data from the J-th memory block. A plurality of sub-driver blocks may be included.

  If such a sub-driver block is provided, a data signal corresponding to at least one pixel can be output based on the sub-pixel image data from the Jth memory block.

  In each aspect of the present invention, each of the sub-driver blocks receives gradation data, and applies first and second gradation voltages corresponding to the gradation data to first to Lth (L is 2 or more). A D / A conversion circuit that outputs in a time-sharing manner during each sampling period of the (integer) sampling period, and first to Lth data line driving circuits that share the D / A conversion circuit. Each data line driving circuit of the data line driving circuit samples the first and second gradation voltages output from the D / A conversion circuit in each sampling period of the first to Lth sampling periods. A grayscale generation amplifier that generates a grayscale voltage between the first grayscale voltage and the second grayscale voltage may be included.

  In this case, since only one D / A conversion circuit needs to be provided for the first to Lth data line driving circuits, the area occupied by the D / A conversion circuit can be reduced. Even if the D / A conversion circuit outputs the first and second gradation voltages in a time-sharing manner, the voltage of each of the first to Lth sampling periods is appropriately adjusted by the sampling function of the gradation generation amplifier. Sampling becomes possible. Therefore, it is possible to provide an integrated circuit device that can supply a voltage to a data line with a small circuit configuration even when the number of gradations increases.

  In the aspect of the invention, the gradation generation amplifier may be configured by a flip-around sample / hold circuit.

  By using such a flip-around type sample-and-hold circuit, the tone generation amplifier can be provided with a voltage sample-and-hold function and so-called offset-free can be realized, so that a highly accurate voltage with little variation can be applied to the data line. Can supply.

  In one embodiment of the present invention, the gradation generation amplifier is provided between an operational amplifier, a first input terminal of the operational amplifier, and a first input node of the gradation generation amplifier, and in a sampling period Between the first sampling capacitor in which charges corresponding to the input voltage of the first input node are stored, and the first input terminal of the operational amplifier and the second input node of the gradation generating amplifier And a second sampling capacitor in which charges according to the input voltage of the second input node are accumulated during the sampling period, and the first and second sampling capacitors are included in the sampling period. An output voltage corresponding to the accumulated charge may be output during the hold period.

  According to this configuration, the input voltages to the first and second input nodes are sampled by the first and second sampling capacitors during the sampling period, and the flip-around operation of the first and second sampling capacitors is performed. As a result, an output voltage corresponding to the charge accumulated in the first and second sampling capacitors can be output in the hold period.

  In the aspect of the invention, the gradation generation amplifier includes an operational amplifier in which an analog reference power supply voltage is supplied to a second input terminal thereof, a first input node of the gradation generation amplifier, and the operational amplifier. A first sampling switch element and a first sampling capacitor provided between the first input terminal, a second input node of the gradation generation amplifier, and the first input terminal of the operational amplifier; A second sampling switch element and a second sampling capacitor provided between the feedback amplifier, a feedback switch element provided between the output terminal of the operational amplifier and the first input terminal, A first buffer provided between a first connection node between the first sampling switch element and the first sampling capacitor and the output terminal of the operational amplifier. And a second connection node between the second switch element for sampling and the second sampling switch element and the second sampling capacitor, and a second connection node provided between the output terminal of the operational amplifier. A flip-around switch element may be included.

  In this way, sampling of the input voltage to the first and second sampling capacitors is realized using the first and second sampling switch elements and the feedback switch element, and the first and second flip-flops are realized. Using the around switch element, the flip-around operation of the first and second sampling capacitors can be realized.

  In the aspect of the invention, in the sampling period, the first and second sampling switch elements and the feedback switch element are turned on, and the first and second flip-around switch elements are turned on. In the hold period, the first and second sampling switch elements and the feedback switch element are turned off, and the first and second flip-around switch elements are turned on. Good.

  In this way, the first and second sampling capacitors and the feedback switch device are turned on during the sampling period, so that the first and second sampling capacitors are utilized by utilizing the imaginary short function of the operational amplifier. It is possible to store charges corresponding to the input voltage. Also, by turning on the first and second flip-around switch elements in the hold period, the output voltage corresponding to the electric charge accumulated in the first and second sampling capacitors is output to the output node of the gradation generation amplifier. Can be output.

  In the aspect of the invention, the first and second sampling switch elements may be turned off after the feedback switch element is turned off.

  By so doing, it is possible to minimize the adverse effects of charge injection from the first and second sampling switch elements and the like.

  Another aspect of the invention relates to an electro-optical device including any one of the integrated circuit devices described above.

  Another aspect of the invention relates to an electronic apparatus including the electro-optical device described above.

  Hereinafter, preferred embodiments of the present invention will be described in detail. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are indispensable as means for solving the present invention. Not necessarily.

1. Circuit Configuration of Integrated Circuit Device FIG. 1 shows a circuit configuration example of an integrated circuit device 10 (driver) of this embodiment. Note that the integrated circuit device 10 of the present embodiment is not limited to the configuration shown in FIG. 1, and some of the components (for example, a scan driver, a gradation voltage generation circuit, a logic circuit, etc.) may be omitted, Various modifications such as addition are possible.

  The electro-optical panel 400 (electro-optical device) includes a plurality of data lines (for example, source lines), a plurality of scanning lines (for example, gate lines), and a plurality of pixels specified by the data lines and the scanning lines. A display operation is realized by changing the optical characteristics of electro-optical elements (liquid crystal elements, EL elements, etc. in a narrow sense) in each pixel region. This electro-optical panel (display panel in a narrow sense) can be constituted by an active matrix type panel using switch elements such as TFT and TFD. The electro-optical panel may be a panel other than the active matrix system, or may be a panel using a light emitting element such as an organic EL (Electro Luminescence) or an inorganic EL other than the liquid crystal panel.

  The memory 20 (display data RAM) stores image data. The memory cell array 22 includes a plurality of memory cells and stores image data (display data) for at least one frame (one screen). The row address decoder 24 (MPU / LCD row address decoder) performs a decoding process on the row address and performs a word line selection process of the memory cell array 22. A column address decoder 26 (MPU column address decoder) performs a decoding process on the column address and performs a selection process of a bit line of the memory cell array 22. The write / read circuit 28 (MPU write / read circuit) performs image data write processing to the memory cell array 22 and image data read processing from the memory cell array 22.

  The logic circuit 40 (driver logic circuit) generates a control signal for controlling display timing, a control signal for controlling data processing timing, and the like. The logic circuit 40 can be formed by automatic placement and routing such as a gate array (G / A).

  The control circuit 42 generates various control signals and controls the entire apparatus. Specifically, gradation adjustment data (γ correction data) for adjusting gradation characteristics (γ characteristics) is output to the gradation voltage generation circuit 110, or the power supply voltage is supplied to the power supply circuit 90. Outputs power adjustment data for adjustment. In addition, a write / read process to the memory using the row address decoder 24, the column address decoder 26, and the write / read circuit 28 is controlled.

  The display timing control circuit 44 generates various control signals for controlling the display timing, and controls reading of image data from the memory 20 to the electro-optical panel 400 side. The host (MPU) interface circuit 46 implements a host interface that accesses the memory 20 by generating an internal pulse for each access from the host. The RGB interface circuit 48 realizes an RGB interface that writes moving image RGB data to the memory 20 using a dot clock. Note that only one of the host interface circuit 46 and the RGB interface circuit 48 may be provided.

  The data driver 50 is a circuit that generates a data signal (voltage, current) to be supplied to a data line of the electro-optical panel 400 (electro-optical device). Specifically, the data driver 50 receives image data (grayscale data, display data) from the memory 20, and receives a plurality of (for example, 256 levels) grayscale voltages (reference voltages) from the grayscale voltage generation circuit 110. Then, a voltage (data voltage) corresponding to the image data (gradation data) is selected from the plurality of gradation voltages, and is output to the data line of the electro-optical panel 400.

  The scanning driver 70 is a circuit that generates a scanning signal for driving the scanning lines of the electro-optical panel 400. Specifically, a signal (enable input / output signal) is sequentially shifted in a built-in shift register, and a signal obtained by level-converting the shifted signal is applied to each scanning line of the electro-optical panel 400 as a scanning signal (scanning voltage). Output. The scan driver 70 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 90 is a circuit that generates various power supply voltages, and FIG. The booster circuit 92 is a circuit that 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, and includes primary to quaternary boosting circuits and the like. be able to. The booster circuit 92 can generate a high voltage used by the scan driver 70 and the gradation voltage generation circuit 110. The VCOM generation circuit 100 generates and outputs a VCOM voltage to be supplied to the counter electrode of the electro-optical panel 400. The control circuit 102 controls the power supply circuit 90 and includes various control registers. The output circuit 104 (regulator circuit, power supply voltage supply) adjusts the voltage of the boosted voltage generated by the booster circuit 92 and outputs various power supply voltages.

  A gradation voltage generation circuit (γ correction circuit) 110 is a circuit that generates a gradation voltage, and FIG. The ladder resistor circuit 112 (voltage dividing circuit) generates and outputs grayscale voltages V0 to V64 based on the grayscale voltage generation power supply voltages VGMH and VGML generated by the power supply circuit 90. Specifically, the ladder resistor circuit 112 has a plurality of resistors RD0 to RD65 connected in series between the power supply voltages VGMH and VGML, and outputs gradation voltages V0 to V64 to taps between these resistors. Here, the resistors RD0 to RD65 are variable resistors, and the resistance values are set based on the gradation adjustment data set in the adjustment register 114. Thereby, the gradation voltage having the optimum gradation characteristic (γ correction characteristic) according to the type of the electro-optical panel 400 can be generated.

  In the case of polarity inversion driving, the voltage values of the gradation voltages V0 to V64 may be different between the positive electrode period (first period in a broad sense) and the negative electrode period (second period in a broad sense). . In this case, the gradation voltage for the positive period and the gradation voltage for the negative period can be generated by switching the setting of the resistance values of the resistors RD0 to RD65 of the ladder resistor circuit 112 based on the gradation adjustment data.

  The gradation characteristics may be different for R (first color component in a broad sense), G (second color component in a broad sense), and B (third color component in a broad sense). . As described above, when the R, G, and B independent gradation characteristics (γ characteristics) are used, the gradation voltage generation circuit 110 performs the R (red) sampling period of the sample hold circuit included in the data driver 50 in the R (red) sampling period. For example, the G gradation voltage may be output, the G gradation voltage may be output during the G (green) sampling period, and the B gradation voltage may be output during the B (blue) sampling period. The gradation voltages for R, G, and B in this case can be generated by switching the setting of the resistance values of the resistors RD0 to RD65 of the ladder resistor circuit 112 based on the gradation data.

  The configuration of the gradation voltage generation circuit 110 is not limited to that shown in FIG. 2B. A circuit (for example, an operational amplifier) that performs impedance conversion of the gradation voltages V0 to V64 is provided, or a plurality of ladders for positive and negative electrodes are provided. Modifications such as providing a resistance circuit or providing a plurality of ladder resistance circuits for R, G, and B are possible.

2. Layout Arrangement of Integrated Circuit Device FIG. 3 shows a layout arrangement example of the integrated circuit device 10 of this embodiment. In FIG. 3, the direction from the first side SD1 which is the short side of the integrated circuit device 10 to the third side SD3 facing the first side D1 is defined as a first direction D1, and the direction opposite to D1 is defined as a third direction D3. . The direction from the second side SD2 which is the long side of the integrated circuit device 10 to the fourth side SD4 facing the second side D2 is a second direction D2, and the opposite direction of D2 is a fourth direction D4. In FIG. 3, the left side of the integrated circuit device 10 is the first side SD1 and the right side is the third side SD3. However, the left side is the third side SD3 and the right side is the first side SD1. May be.

  The integrated circuit device 10 of FIG. 3 includes a plurality of memory blocks MB1 to MB6 (first to Nth memory blocks in a broad sense, where N is an integer of 2 or more). These memory blocks MB1 to MB6 store image data for image display. Memory blocks MB1 to MB6 are arranged (arranged) along the direction D1.

  Specifically, the memory blocks MB1 to MB6 are obtained by dividing the memory 20 of FIG. 1 into banks. Each of the memory blocks MB1 to MB6 (memory cell array) stores image data corresponding to a data signal supplied to each of the first data line group to the sixth data line group of the electro-optical panel 400. The number of blocks of the memory blocks MB1 to MB6 is not limited to six and is arbitrary. Further, a column address decoder, a row address decoder, a sense amplifier block, and the like provided in each memory block together with the memory cell array may be provided independently in each memory block, or a part or all of them may be shared.

  The integrated circuit device 10 includes a data driver DR composed of data driver blocks DB1 to DB6. The data driver DR is arranged on the D2 direction side of the memory blocks MB1 to MB6 and supplies data signals (data voltage, data current) to a plurality of data lines of the electro-optical panel 400 (electro-optical device).

  Specifically, the data driver DR (data driver block, sub-driver block) includes a latch circuit (pre-latch circuit, post-latch circuit), a D / A conversion circuit (DAC), or a data line drive circuit (driver cell, output circuit). , Buffer circuit) and the like. These latch circuit, D / A conversion circuit, and data line driving circuit can be provided, for example, for each data line (for each subpixel and for each pixel) of the electro-optical panel 400. Note that a plurality of data lines may share a latch circuit, a D / A conversion circuit, or a data line driver circuit.

  The latch circuit included in the data driver DR latches image data (subpixel image data) from the memory blocks MB to MB6 (memory). The D / A conversion circuit performs D / A conversion of the latched digital image data to generate an analog data signal. Specifically, a plurality of gradation voltages (reference voltages) are received from the gradation voltage generation circuit 110 of FIG. 1, and a voltage corresponding to digital image data is selected from the plurality of gradation voltages, Output as a data signal (data voltage). The data line driving circuit buffers the data signal from the D / A conversion circuit using an operational amplifier or the like, and outputs the data signal to the data line of the electro-optical panel 400 to drive the data line. When the electro-optical panel 400 is, for example, a low-temperature polysilicon TFT liquid crystal panel, the data line driving circuit may multiplex R, G, and B data signals and output them in a time-sharing manner. . In this way, the number of data signal pads (terminals in a broad sense) can be reduced. The data driver DR may include a plurality of data driver blocks as will be described later. In this case, each data driver block receives the image data stored in the corresponding memory block among the plurality of memory blocks, and drives the data lines. Further, the electro-optical panel 400 may be a so-called black and white panel, or a single color panel of R, G, or B. In this case, for example, the sub-pixel and the pixel are equivalent.

  The data driver blocks DB1 to DB6 (first to Nth data driver blocks in a broad sense) are arranged along the direction D1. Specifically, the memory blocks MB1 to MB6 are arranged along the D1 direction in the D2 direction. Data signals are supplied to a plurality of data lines of the electro-optical panel 400 (electro-optical device). In this case, the memory block MB1 stores image data necessary for generating a data signal in the data driver block DB1, and the memory block MB2 stores image data required for generating a data signal in the data driver block DB2. To do. Similarly, the memory blocks MB3 to MB6 store image data necessary for generating data signals in the data driver blocks DB3 to DB6.

  Of the memory blocks MB1 to MB6 (first to Nth memory blocks), the memory block MB1 (Jth memory block in a broad sense; J is an integer satisfying 1 ≦ J ≦ N) is at least one subpixel. Sub-pixel image data which is image data (for example, for 1 to 8 sub-pixels) is read out from the memory cell array in a dot-sequential manner. Then, the read subpixel image data is output to the corresponding data driver block DB1 (J-th data driver block in a broad sense) among the data driver blocks DB1 to DB6 in a time division manner. That is, the image data that has been read out in a line sequential manner is read out in a dot sequential manner from the port (data driver side port) of the memory block MB1. For example, in a black-and-white panel or a single-color panel, the subpixel image data and the pixel image data are equivalent.

  Specifically, between the memory block MB1 and the data driver block DB1, k bits (k is a natural number, for example, k) for transferring subpixel image data (R, G, B image data) in a time division manner. = 8, 16, 32, etc.) of the data transfer bus TB1 is wired. Then, k-bit subpixel image data is transferred via the data transfer bus TB1.

  The data driver block DB1 receives the subpixel image data from the memory block MB1 and outputs a data signal corresponding to the subpixel image data.

  Similarly, the memory block MB2 reads the subpixel image data dot-sequentially and outputs it to the corresponding data driver block DB2 in a time division manner. Specifically, a k-bit data transfer bus TB2 for transferring the subpixel image data in a time division manner is wired between the memory block MB2 and the data driver block DB2. Then, k-bit subpixel image data is transferred via the data transfer bus TB2.

  The data driver block DB2 receives the subpixel image data from the memory block MB2 and outputs a data signal corresponding to the subpixel image data.

  Similarly, subpixel image data is transferred in a time division manner between the memory blocks MB3 to MB6 and the corresponding data driver blocks DB3 to DB6 via the data transfer buses TB3 to TB6.

  The transfer of subpixel image data between the memory blocks MB1 to MB6 and the data driver blocks DB1 to DB6 is simultaneously performed in parallel in each horizontal scanning period. For example, in the period in which the image data of the subpixel corresponding to the intersection position of the first scanning line and the first data line group is transferred between the memory block MB1 and the data driver block DB1, in parallel therewith, The image data of the subpixel corresponding to the intersection position of the first scanning line and the second data line group adjacent to the first data line group is transferred between the memory block MB2 and the data driver block DB2. The same applies to the data transfer between the memory blocks MB3 to MB6 and the data driver blocks DB3 to DB6.

  As described above, in the present embodiment, reading of image data from the memory (RAM), which has been performed line-sequentially so far, is performed dot-sequentially. Then, the image data of the sub-pixels read out from each memory block in a dot-sequential manner is transferred to the data driver block corresponding to the memory block in a time division manner. In this way, it becomes possible to eliminate the mutual dependency of the layout relationship between the memory blocks MB1 to MB6 and the data driver blocks DB1 to DB6, which affects the layout of the memory blocks MB1 to MB6. The data driver blocks DB1 to DB6 can be arranged without receiving them. Therefore, the degree of freedom in layout arrangement is increased and layout efficiency can be improved. Thereby, for example, the width W in the D2 direction of the integrated circuit device 10 can be reduced, and a slim and slender chip can be realized. As a result, the chip area of the integrated circuit device 10 can be reduced and mounting can be facilitated.

  For example, FIGS. 4A and 4B show an integrated circuit device of a comparative example of this embodiment. In the integrated circuit device 700 of FIG. 4A, the data driver block DB1 is arranged on the D2 direction side of the memory block MB1, and the data driver block DB2 is arranged on the D2 direction side of the memory block MB2. Another circuit is arranged between the memory blocks MB1 and MB2 or between the data driver blocks DB1 and DB2.

  In FIG. 4A, reading of image data from the memory block MB1 is performed in a line sequential manner, and image data (image data for one line) of the memory block MB1 is read all at once at a predetermined timing to obtain data. It is output to the driver block DB1. Similarly, reading of image data from the memory block MB2 is also performed line-sequentially, and image data in the memory block MB2 is read at a predetermined timing and output to the data driver block DB2. For this reason, the memory block MB1 and the data driver block DB1 are connected by the same number of signal lines as the corresponding data lines (for example, half the number of data lines of the electro-optical panel), and the memory block MB2 and the data driver are connected. The blocks DB2 are also connected by the same number of signal lines as the corresponding data lines. Therefore, since the number of these signal lines is very large, the degree of freedom in layout arrangement of the memory blocks MB1 and MB2 and the data driver blocks DB1 and DB2 is low. For example, if the memory block MB1 and the data driver block DB1 are arranged so that their center positions are shifted in the D1 direction, the width of the integrated circuit device 700 in the D2 direction due to the wiring area of the signal lines connecting between them. W will increase significantly. For this reason, there is a problem that it is difficult to reduce the width W and realize a slim elongated chip. In particular, there is a problem that it is difficult to cope with an increase in the number of data lines of the electro-optical panel for high definition.

  In the integrated circuit device 710 (Japanese Patent Laid-Open No. 2007-243125) shown in FIG. 4B, the memory block MB1 and the data driver block DB1 are adjacently disposed along the direction D1. The layout arrangement of the memory blocks MB2 to MB5 and the data driver blocks DB2 to DB5 is the same.

  The integrated circuit device 710 in FIG. 4B has advantages in that the degree of freedom in layout arrangement is high and the width W in the D2 direction can be reduced as compared with the integrated circuit device 700 in FIG. .

  However, in FIG. 4B, the signal line from each memory block to each data driver block is routed along the direction D1 (D3). There is a problem that the layout area becomes large. Further, it is necessary to rearrange the wirings for connecting the output signal lines of the respective data driver blocks to the data signal pads. Therefore, there is also a problem that the width W in the D2 direction cannot be reduced by another because of the rearrangement of the wirings.

  In this regard, in FIG. 3, image data is read from each memory block in a dot sequence. Therefore, the number of data transfer buses (TB1 to TB6) connecting each memory block and each data driver block is k, and the number of signal lines connecting each memory block and each data driver block in FIG. It is much less than Therefore, the degree of freedom in layout is higher than that in FIG.

  For example, in FIG. 3, the Jth memory block of the plurality of memory blocks and the Jth data driver block of the plurality of data driver blocks can be arranged with their center positions shifted in the D1 direction. Therefore, circuits other than the memory block and the data driver block, pads (terminals in a broad sense), and the like can be arranged in the free space formed by the layout arrangement shifted in this way, and layout efficiency Can be improved.

  For example, if the memory blocks MB1 to MB6 and the data driver blocks DB1 to DB6 are shifted from each other as shown in FIG. 3, the data driver block DB6 (Nth memory block) is in the direction D1 of the memory block MB6 (Nth memory block). An empty area can be formed in the direction D4 of the data driver block. Therefore, for example, other circuits such as a gradation voltage generation circuit and a logic circuit can be arranged in this empty area.

  In addition, if MB1 to MB6 and DB1 to DB6 are shifted and arranged as shown in FIG. 3, it is in the direction D2 of the memory block MB1 (first memory block) and the data driver block DB1 (first data driver block). An empty area can also be formed in the D3 direction. Therefore, for example, a plurality of scanning signal pads for supplying scanning signals to a plurality of scanning lines of the electro-optical panel 400 (electro-optical device) can be arranged in this empty area. As a result, the free space can be effectively used, and the layout efficiency can be improved.

  In FIG. 3, the number of data transfer buses TB3 between the memory block MB3 and the data driver block DB3 is small, for example, k = 8 or 16, and the number of data transfer buses TB4 between the memory block MB4 and the data driver block DB4 is small. The number is also small, for example, k = 8 or 16. Therefore, for example, by disposing the memory block MB3 in the D3 direction side and disposing the memory block MB4 in the D1 direction side, an empty area can be formed between the memory blocks MB3 and MB4. Accordingly, other circuits such as the power supply circuit PB can be arranged in this empty area. By arranging the power supply circuit PB in this way, the impedance of the analog reference power supply voltage AGND output from the AGND output circuit of the power supply circuit PB and supplied to the data driver DR can be made uniform. As a result, display characteristics can be prevented from deteriorating, so that both layout efficiency and display characteristics can be improved.

  In the comparative example of FIG. 4B, it is necessary to wire a large number of signal lines from each memory block in each data driver block. However, in FIG. 3, such wiring can be made unnecessary. Therefore, the area of each data driver block can be remarkably reduced as compared with FIG. As a result, the width W in the D2 direction of the integrated circuit device 10 can be reduced, a slim and slender chip can be realized, and the chip area can be reduced. In FIG. 4B, it is necessary to rearrange the wiring of the output signal lines from each data driver block. However, in FIG. 3, such rearrangement of the wiring can be made unnecessary. Therefore, an increase in the width W caused by the rearrangement region can be prevented, and the integrated circuit device 10 can be further slimmed.

  FIG. 5 shows a detailed layout arrangement example of the integrated circuit device 10 of the present embodiment. Note that FIG. 5 shows an example of the layout arrangement, and the layout arrangement of the present embodiment is not limited to FIG.

  In FIG. 5, memory blocks MB1 to MB10 (first to Nth memory blocks) are arranged along the direction D1. Data driver blocks DB1 to DB10 are arranged along the direction D1 in the direction D2 of the memory blocks MB1 to MB10. In this case, the memory blocks MB1 to MB10 and the corresponding data driver blocks of the data driver blocks DB1 to DB10 are arranged with their center positions shifted in the D1 direction. That is, the right end of the memory blocks MB1 to MB10 and the right end of the data driver blocks DB1 to DB10 are shifted in the D1 direction, and the left end of the memory blocks MB1 to MB10 and the left end of the data driver blocks DB1 to DB10 are also shifted in the D1 direction. .

  The gradation voltage generation circuit GB generates a plurality of gradation voltages and supplies them to the data driver blocks DB1 to DB10. The gradation voltage signal lines in this case are wired on the memory blocks MB1 to MB10, for example. In FIG. 5, the gradation voltage generation circuit GB is arranged in the direction D1 of the rightmost memory block MB10 (Nth memory block) and in the direction D4 of the rightmost data driver block DB10 (Nth data driver block). Is done. In this way, it is possible to arrange the gradation voltage generation circuit GB by effectively utilizing this empty area.

  The scan driver SB1 disposed at the left end of the integrated circuit device 10 generates a scan signal. This scanning signal is supplied to the scanning line of the electro-optical panel 400 via the scanning signal pad disposed in the scanning signal pad region PSR1. Similarly, the scan driver SB2 disposed at the right end of the integrated circuit device 10 generates a scan signal. This scanning signal is supplied to the scanning line of the electro-optical panel 400 via the scanning signal pad disposed in the scanning signal pad region PSR2.

  In this case, in FIG. 5, a plurality of scanning signal pads (region PSR1) for supplying scanning signals to the scanning lines are in the D2 direction of the leftmost memory block MB1 (first memory block), The data driver block DB1 (first data driver block) is arranged in the D3 direction. In this way, it is possible to arrange a large number of scanning signal pads in the area PSR1 by effectively utilizing this empty area.

  In FIG. 5, an AGND output circuit AR is disposed between the memory block MB6 (Mth memory block) and the memory block MB7 (M + 1th memory block). The AGND line from the AGND output circuit AR is wired on the data driver blocks DB1 to DB10 along the D1 direction. As a result, the impedance of AGND can be made uniform.

  In FIG. 5, a data signal pad arrangement area PDR (first interface area, output side I / O area) is provided in the direction D2 of the data driver blocks DB1 to DB10. Further, in the pad area PIOR (second interface area, input side I / O area) on the D4 direction side of the memory blocks MB1 to MB10, a pad (input / output pad) for the logic circuit LB and a booster of the power supply circuit PB are provided. A boosting pad for connecting a capacitor for power supply and a power supply pad for connecting a capacitor for stabilizing the power supply are arranged. A boosting transistor (boosting circuit) of the power supply circuit PB is arranged in an elongated region between the memory blocks MB1 to MB10 and the pad region PIOR. With this arrangement, the drain of the boosting transistor can be connected to the boosting pad through a short path.

3. Details of Data Transfer Next, details of data transfer between the data driver block and the memory block will be described. In FIG. 6, a latch circuit is provided between the memory blocks MB1 to MB6 (first to Nth memory blocks) and the data driver blocks DB1 to DB6 (first to Nth memory blocks). Specifically, pre-latch circuits LTA1 to LTA6 (first to Nth pre-latch circuits in a broad sense) and post-latch circuits LTB1 to LTB6 (first to Nth post-latch circuits in a broad sense) are provided. .

  The pre-latch circuit LTA1 (J-th pre-latch circuit in a broad sense) of the pre-latch circuits LTA1 to LTA6 (previous-stage latch circuit) is a sub-pixel image output in a time-sharing manner from the memory block MB1 (J-th memory block). Latch data sequentially. Specifically, the clock DCK is used to transfer k-bit subpixel image data from the left flip-flop circuit to the right flip-flop circuit among the plurality of k-bit flip-flop circuits (registers) included in the pre-latch circuit LTA1. Latch in sequence. That is, the k-bit subpixel image data is sequentially latched in the flip-flop circuit in which the latch is enabled by the enable signal ENB. If each of R data, G data, and B data, which are sub-pixel image data, is 8-bit data, k = 8 when image data for one sub-pixel is transferred, and 2 sub-pixels. K = 16 in the case where the image data is transferred.

  Of the post-latch circuits LTB1 to LTB6 (later stage latch circuits), the post-latch circuit LTB1 (J-th post-latch circuit in a broad sense) After latching, the latched subpixel image data is read out from the pre-latch circuit LTA1 in a line sequential manner and latched. Then, the latched subpixel image data is output to the data driver block DB1 (Jth data driver block). Specifically, the post-latch circuit LTB1 reads and latches all the subpixel image data latched by the pre-latch circuit LTA1 all at once using the latch clock LCK. The latched subpixel image data is output to the data driver block DB1.

  The pre-latch circuit LTA2 sequentially latches the subpixel image data output from the memory block MB2 in a time division manner. Then, after latching the subpixel image data in the pre-latch circuit LTA2, the post-latch circuit LTB2 reads and latches the latched subpixel image data from the pre-latch circuit LTA2. The latched subpixel image data is output to the data driver block DB2. The operations of the other pre-latch circuits LTA3 to LTA6 and post-latch circuits LTB3 to LTB6 are the same. The latch operations of the pre-latch circuits LTA1 to LTA6 are performed in parallel at the same timing, and the latch operations of the post latch circuits LTB1 to LTB6 are performed in parallel at the same timing.

  FIG. 7 shows a detailed configuration example of the pre-latch circuit LTA1, the post-latch circuit LTB1, and the data driver block DB1. The detailed configurations of the pre-latch circuits LTA2 to LTA6, the post-latch circuits LTB2 to LTB6, and the data driver blocks DB2 to DB6 are the same as those in FIG.

  The pre-latch circuit LTA1 (Jth pre-latch circuit) includes a plurality of flip-flop circuits FFA10 to FFA15. Each of these flip-flop circuits FFA10 to FFA15 is a circuit (register) that can hold subpixel image data of k = 8 bits.

  The post latch circuit LTB1 (Jth post latch circuit) also includes a plurality of flip-flop circuits FFB10 to FFB15. Each of these flip-flop circuits FFB10 to FFB15 is also a circuit (register) that can hold k = 8-bit subpixel image data.

  The data driver block DB1 (Jth data driver block) includes a plurality of sub driver blocks SDB0 to SDB5. Each sub-driver block of SDB0 to SDB5 outputs a data signal corresponding to at least one pixel based on the sub-pixel image data from the memory block MB1 (Jth memory block). For example, the sub driver block SDB0 outputs R, G, and B data signals DSR0, DSG0, and DSB0 corresponding to one pixel based on the subpixel image data. Similarly, the sub-driver block SDB1 outputs R, G, and B data signals DSR1, DSG1, and DSB1 corresponding to one pixel. The same applies to the other sub-driver blocks SDB2 to SDB5.

  In FIG. 7, each of the sub-driver blocks SDB0 to SDB5 includes a D / A conversion circuit and a plurality of data line driving circuits (sub-pixel driver cells and gradation amplifiers) that share the D / A conversion circuit.

  For example, the sub-driver block SDB0 includes a D / A conversion circuit DAC0 and data line driving circuits GR0, GG0, and GB0 that share the DAC0 in a time division manner. These GR0, GG0, and GB0 are R, G, and B data line driving circuits, respectively, and output R, G, and B data signals DSR0, DSG0, and DSB0.

  The sub-driver block SDB1 includes a D / A conversion circuit DAC1 and data line driving circuits GR1, GG1, and GB1 that share the DAC1 in a time division manner. These GR1, GG1, and GB1 are R, G, and B data line drive circuits, respectively, and output R, G, and B data signals DSR1, DSG1, and DSB1. The same applies to the other sub-driver cells SDB2 to SDB5. Note that DSR1, DSG1, and DSB1 are data signals for pixels adjacent to DSR0, DSG0, and DSB0, and DSR2, DSG2, and DSB2 are data signals for pixels adjacent to DSR1, DSG1, and DSB1.

  Next, the operation of FIG. 7 will be described using the signal waveform example of FIG. First, as indicated by F1 in FIG. 8, the memory block MB1 reads the subpixel image data R0 to R5 of k = 8 bits in a dot-sequential manner and outputs them in a time division manner. Then, as indicated by F2, the pre-latch circuit LTA1 (J-th pre-latch circuit) is a sub-pixel of R (first color component in a broad sense) output in a time-sharing manner from the memory block MB1 (J-th memory block). The image data R0 to R5 are latched sequentially. Specifically, when the enable signal ENB indicates “0” as indicated by F3, the flip-flop circuit FFA10 of FIG. 7 latches the sub-pixel image data R0 using the clock DCK. When the enable signal ENB indicates “1” as indicated by F4, the adjacent flip-flop circuit FFA11 latches the subpixel image data R1 using the clock DCK. Similarly, when the signal ENB indicates “2”, “3”, “4”, “5”, the flip-flop circuits FFA12, FFA13, FFA14, and FFA15 are subpixel image data R2, R3, and R4, respectively. , R5 are latched using the clock DCK.

  Next, the post-latch circuit LTB1 (Jth post-latch circuit) completes the latching of the subpixel image data R0 to R5 of R (first color component) as indicated by F5 after the pre-latch circuit LTA1 performs F6. As shown, the latched subpixel image data R0 to R5 are read line-sequentially from the pre-latch circuit LTA1 and latched. Specifically, the sub-pixel image data R0 to R5 latched in the flip-flop circuits FFA10 to FFA15 of the pre-latch circuit LTA1 are latched simultaneously by the flip-flop circuits FFB11 to FFB15 of the post-latch circuit LTB1 using the latch clock LCK. .

  When the R subpixel image data R0 to R5 are latched in the post-latch circuit LTB1 as indicated by F7, the data driver block DB1 (Jth data driver block) is latched as indicated by F8. A signal (voltage) corresponding to the data R0 to R5 is sampled. Then, the sampled voltage is held as indicated by F9. Specifically, each of the D / A conversion circuits DAC0 to DAC5 of the sub driver blocks SDB0 to SDB5 performs D / A conversion on each of the subpixel image data R0 to R5. Then, each of the R data line drive circuits GR0 to GR5 (sample hold circuit) of the sub driver blocks SDB0 to SDB5 samples and holds the voltage obtained by the D / A conversion.

  Next, as indicated by F10, the pre-latch circuit LTA1 sequentially latches G (second color component in a broad sense) subpixel image data G0 to G5 output from the memory block MB1 in a time division manner.

  Next, after the pre-latch circuit LTA1 completes the latching of the sub-pixel image data G0 to G5 as indicated by F11, the post-latch circuit LTB1 pre-latches the latched sub-pixel image data G0 to G5 as indicated by F12. Read and latch line-sequentially from LTA1.

  Next, when the subpixel image data G0 to G5 is latched in the post latch circuit LTB1 as indicated by F13, the data driver block DB1 corresponds to the latched subpixel image data G0 to G5 as indicated by F14. Sampling signal (voltage). Then, the sampled voltage is held as indicated by F15.

  Next, as indicated by F16, the pre-latch circuit LTA1 sequentially latches B (third color component in a broad sense) subpixel image data B0 to B5 output in a time-sharing manner from the memory block MB1.

  Next, after the pre-latch circuit LTA1 completes the latching of the sub-pixel image data B0 to B5 as indicated by F17, the post-latch circuit LTB1 pre-latches the latched sub-pixel image data B0 to B5 as indicated by F18. Read and latch line-sequentially from LTA1.

  Next, when the subpixel image data B0 to B5 are latched in the post-latch circuit LTB1 as indicated by F19, the data driver block DB1 corresponds to the latched subpixel image data B0 to B5 as indicated by F20. Sampling signal (voltage). Then, the sampled voltage is held as indicated by F21.

  As described above, according to the method of FIG. 8, the R subpixel image data, the G subpixel image data, and the B subpixel image data are sequentially latched in the order of R, G, and B, and the data driver block Can be entered in DB1. The data driver block DB1 samples and holds signals (voltages) corresponding to the R, G, and B subpixel image data.

  In this way, for example, when the gradation characteristics for R, G, and B are different, the gradation voltage generation circuit 110 in FIG. By outputting the voltage in a time-sharing manner, so-called R, G, and B independent γ correction can be realized, and display quality can be improved.

  In the above description, the case where each memory block outputs image data for one subpixel in time division (dot sequential) has been described. However, the present embodiment is not limited to this, and image data for a plurality of subpixels is output. You may output by a time division. A configuration example of the pre-latch circuit LTA1, the post-latch circuit LTB1, and the data driver block DB1 in this case is shown in FIG. In FIG. 9, k = 16-bit subpixel image data corresponding to two subpixels is output from the memory block MB1. The 16-bit subpixel image data is sequentially latched in the flip-flop circuits FFA10 to FFA15. After that, it is latched in the flip-flop circuits FFB10 to FFB15 in the next stage.

  In FIG. 9, each of the sub-driver blocks SDB0 to SDB5 outputs a data signal corresponding to two pixels based on the sub-pixel image data from the memory block MB1. Specifically, the sub-driver block SDB0 outputs R, G, and B data signals DSR0, DSG0, DSB0, DSR1, DSG1, and DSB1 corresponding to two pixels. Similarly, the sub-driver block SDB1 outputs R, G, and B data signals DSR2, DSG2, DSB2, DSR3, DSG3, and DSB3 corresponding to two pixels. The same applies to the other sub-driver blocks SDB2 to SDB5.

  With such a configuration, data transfer from the memory block to the pre-latch circuit can be speeded up. As a result, it is possible to allow time for sampling operation and hold operation in the data driver block.

4). Data Driver Next, a detailed configuration example of the data driver will be described with reference to FIG. FIG. 10 is a configuration example of each sub-driver block of SDB0 to SDB5 described in FIG. 7 and FIG. 9 among the data drivers. Specifically, each sub-driver block includes a D / A conversion circuit 52 and data line driving circuits 60-1 to 60-L. In FIG. 10, one D / A conversion circuit 52 is shared by a plurality of data line driving circuits 60-1 to 60-L (first to Lth data line driving circuits). A data line driving circuit or the like may be provided for each data line of the electro-optical panel, or the data line driving circuit may drive a plurality of data lines in a time division manner. A part or all of the data driver (integrated circuit device) may be integrally formed on the electro-optical panel.

  The D / A conversion circuit 52 (voltage generation circuit) receives gradation data DG (image data, display data) from the memory 20 of FIG. 1, for example. Then, the first and second gradation voltages VG1 and VG2 corresponding to the gradation data DG are output.

  Specifically, the D / A conversion circuit 52 receives the gradation data and applies the first and second gradation voltages VG1 and VG2 corresponding to the gradation data to each sampling in the first to Lth sampling periods. Output in time division during the period.

  The data line driving circuits 60-1 to 60-L include gradation generation amplifiers 62-1 to 62-L (GA1 to GAL). Each of these gradation generation amplifiers 62-1 to 62-L has first and second gradation voltages VG1 output from the D / A conversion circuit 52 in each sampling period of the first to Lth sampling periods. , VG2 is sampled to generate a gradation voltage between VG1 and VG2.

  FIG. 11 shows a second configuration example of the data driver (sub driver block). In FIG. 11, the data line driving circuits 60-1 to 60-L include driving amplifiers 64-1 to 64-L (first to L-th driving amplifiers) provided after the gradation generation amplifiers 62-1 to 62-L. Drive amplifier).

  The drive amplifiers 64-1 to 64-L (DA1 to DAL) included in the data line drive circuits 60-1 to 60-L generate gradations in the drive amplifier sampling period after the first to Lth sampling periods. The output voltage of the amplifiers 62-1 to 62-L is sampled. In the drive amplifier hold period after the drive amplifier sampling period, the sampled output voltage is output.

  For example, FIG. 12 shows an example of a signal waveform when the D / A conversion circuit 52 is shared by the six data line driving circuits GA1 to GA6. The data line driving circuits GA1 to GA6 perform a sampling operation in the sampling periods TS1 to TS6 (first to Lth sampling periods), and perform a holding operation in the subsequent hold periods TH1 to TH6 (first to Lth hold periods). Do.

  The drive amplifiers DA1 to DA6 perform a sampling operation in the drive amplifier sampling period TDS after the sampling periods TS1 to TS6, and perform a hold operation in the subsequent drive amplifier hold period TDH.

  10 and 11, it is not necessary to provide a D / A conversion circuit for each data line driving circuit, and one D / A conversion is performed for a plurality of data line driving circuits 60-1 to 60-L. A circuit 52 may be provided. Therefore, the area occupied by the D / A conversion circuit 52 in the integrated circuit device can be reduced, and the integrated circuit device can be downsized.

  As described above, even if the D / A conversion circuit 52 outputs the first and second gradation voltages VG1 and VG2 in a time division manner, the sampling function of the gradation generation amplifiers 62-1 to 62-L causes the first and second gradation voltages VG1 and VG2 to be output. Appropriate sampling of the voltage in each of the 1st to Lth sampling periods becomes possible.

  Further, when the D / A conversion circuit 52 is used for time division in this way, the total time of the sampling periods TS1 to TS6 becomes longer as shown in FIG. For this reason, for example, the hold period TH6 of the gradation generation amplifier GA6 is shortened, and there is no margin in the drive time of the data line.

  In this regard, if the drive amplifiers DA1 to DA6 are provided after the gradation generation amplifiers GA1 to GA6 as shown in FIG. 11, the drive amplifiers DA1 to DA6 are sampled during the sampling periods TS1 to TS6 as shown by E15 in FIG. DA6 enters the hold operation mode and can drive the data line. Therefore, the drive time of the data line can be extended, and a highly accurate voltage can be supplied to the data line.

  Further, in the conventional data driver, in order to increase the voltage supplied to the data line with high accuracy, for example, in the second half of the driving period, DAC driving for directly driving the data line by the D / A conversion circuit is performed. For this reason, it is necessary to provide a D / A conversion circuit having the same configuration for each data line, which causes an increase in the scale of the integrated circuit device due to the layout area of the D / A conversion circuit.

  In this respect, if the tone generation amplifier and the drive amplifier have a sample hold function and are configured by, for example, a flip-around sample hold circuit, so-called offset free can be realized. Accordingly, it is possible to supply a highly accurate voltage to the data line while minimizing the variation in the output voltage to the data line, and thus the above-described DAC drive is not necessary. Therefore, it is not necessary to provide a D / A conversion circuit having the same configuration for each data line, and a single D / A conversion circuit can be shared by a plurality of data line driving circuits as shown in FIGS. Become. Therefore, it is possible to achieve both high accuracy of the voltage of the data line and reduction of the area of the data driver.

  Further, according to the configurations of FIGS. 10 and 11, there is an advantage that the gradation voltage lines can be shared in time division for R (red), G (green), and B (blue).

  For example, it is assumed that the data transfer bus (gradation data bus) connecting the memory 20 and the data driver 50 in FIG. 1 is a 16-bit bus, for example. Further, it is assumed that the number of bits of each of the R, G, and B subpixels is 8 bits, and the number of bits of the pixel configured by the R, G, and B subpixels is 8 × 3 = 24 bits.

  In this case, in E1 and E2 of FIG. 12, 8-bit sub-pixel image data R0 (gradation data) of the first pixel and 8-bit sub-pixel image data of the second pixel adjacent to the first pixel. R1 (gradation data) is transferred from each memory block to each data driver block via the 16-bit data transfer bus (gradation data bus) described in FIG.

  In E3 of FIG. 12, the D / A conversion circuit 52 outputs first and second gradation voltages VG1 and VG2 corresponding to the 8-bit subpixel image data R0. Then, as indicated by E4, the gradation generating amplifier GA1 performs a sampling operation of VG1 and VG2 in the sampling period TS1, and generates a gradation voltage between VG1 and VG2.

  In E5, the D / A conversion circuit 52 outputs first and second gradation voltages VG1 and VG2 corresponding to the 8-bit subpixel image data R1. Then, as indicated by E6, the gradation generation amplifier GA2 performs a sampling operation of VG1 and VG2 in the sampling period TS2, and generates a gradation voltage between VG1 and VG2.

  In E7 and E8, 8-bit subpixel image data G0 and 8-bit subpixel image data G1 of the second pixel are transferred from each memory block via a 16-bit data transfer bus (gradation data bus). Transferred to each data driver block.

  In E9, the D / A conversion circuit 52 outputs the first and second gradation voltages VG1 and VG2 corresponding to the 8-bit subpixel image data G0. Then, as indicated by E10, the gradation generation amplifier GA3 performs a sampling operation of VG1 and VG2 in the sampling period TS3, and generates a gradation voltage between VG1 and VG2.

  In E11, the D / A conversion circuit 52 outputs first and second gradation voltages VG1 and VG2 corresponding to the 8-bit subpixel image data G1. Then, as indicated by E12, the gradation generation amplifier GA4 performs a sampling operation of VG1 and VG2 in the sampling period TS4 to generate a gradation voltage between VG1 and VG2. In E13 and E14, the sub-pixel image data B0 and B1 are transferred, and the same processing as described above is performed.

  In this way, it is not necessary to provide separate gradation voltage lines for R, G, and B, and one gradation voltage line is used for the gradation voltages for R, G, and B. Can be used in a time-sharing manner. For example, the gradation voltage line can be used for R in E1 and E2 in FIG. 12, the gradation voltage line can be used for G in E7 and E8, and the gradation voltage line can be used for B in E13 and E14.

  For example, when 64 gradation voltage lines are required for each of R, G, and B, the method of providing separate gradation voltage lines for R, G, and B is 64 × 3. = 192 grayscale voltage lines are required.

  In this respect, in the present embodiment, since one gradation voltage line is used for R, G, and B in a time-sharing manner, 64 gradation voltage lines can be used, and the gradation voltage is reduced. The wiring area of the line can be greatly reduced, and the area of the integrated circuit device can be reduced.

  In the present embodiment, a common potential setting method (equalization) of the data lines is adopted in order to realize low power consumption. Specifically, as indicated by E16 in FIG. 12, in the drive amplifier sampling period TDS, the output lines of the drive amplifiers DA1 to DA6 are set to a common potential such as the common voltage VCOM. For example, the common voltage VCOM which is a common potential is set. The common potential is not limited to VCOM, and may be, for example, a GND potential.

  By doing so, the charge accumulated in the electro-optical panel is reused to charge and discharge the charge on the data line of the electro-optical panel, so that the power consumption can be further reduced.

5. Switch Circuits Various modifications of the data driver of this embodiment will be described below. In the following description, in order to simplify the description, the data line driving circuits 60-1 to 60-L, the gradation generation amplifiers 62-1 to 62-L, and the driving amplifier 64 sharing one D / A conversion circuit 52 are used. -1 to 64-L are described as the data line driving circuit 60, the gradation generation amplifier 62, and the driving amplifier 64, respectively, as representatives.

  FIG. 13 shows a modification of the data driver of this embodiment. In this modification, a switch circuit 54 is newly added. In FIG. 13, the D / A conversion circuit 52 receives a plurality of gradation voltages (for example, V0 to V128, V0 to V64) via the gradation voltage line from the gradation voltage generation circuit 110 of FIG. Then, the first and second gradation voltages VG1 and VG2 corresponding to the gradation data DG are selected and output from the plurality of gradation voltages. In this case, the first and second gradation voltages VG1 and VG2 output from the D / A conversion circuit 52 are adjacent gradation voltages. Specifically, adjacent gradation voltages (for example, V0, V1, and V1) in a plurality of gradation voltages (V0 to V128, V0 to V64) input to the D / A conversion circuit 52 via the gradation voltage line. V2, V2 and V3).

  For example, in FIG. 14, the gradation data DG is data of 8 bits (256 gradations) D7 to D0. A plurality of gradation voltages V0 to V128 are input to the D / A conversion circuit 52. Here, V0 to V128 has a monotonically decreasing relationship of V0> V1> V2... V127> V128. However, a monotonically increasing relationship of V0 <V1 <V2... V127 <V128 may be established.

  The D / A conversion circuit 52 outputs VG1 = V1 and VG2 = V0 when the gradation data is DG (D7 to D0) = (00000000), (00000001), and (00000010), (00000011). In this case, VG1 = V1 and VG2 = V2 are output. When DG = (00000100) and (00000101), VG1 = V3 and VG2 = V2 are output, and when (00000110) and (00000111), VG1 = V3 and VG2 = V4 are output.

  As described above, the D / A conversion circuit 52 is the gradation voltage corresponding to the gradation data DG among the gradation voltages V0 to V128 input from the gradation voltage generation circuit 110, and is adjacent to the first and second adjacent ones. 2 gradation voltages VG1 and VG2 are output. FIGS. 13 and 14 are examples in which the D / A conversion circuit 52 generates two types of gradation voltages, the first and second gradation voltages VG1 and VG2. The number) is not limited to this.

  The data line driving circuit 60 (data line driving circuits 60-1 to 60-L) is a circuit for driving the data lines of the electro-optical panel 400, and the gradation generation amplifier 62 (gradation generation amplifiers 62-1 to 62-L). )including. The gradation generation amplifier 62 (gradation generation sample hold circuit) can generate and output a gradation voltage between the first gradation voltage VG1 and the second gradation voltage VG2.

  In FIG. 14, when the gradation data is DG = (00000001), the gradation generation amplifier 62 generates the gradation voltage VS = V0− (V0−V1) / 2 between VG1 = V1 and VG2 = V0. (Sampling) and output. When the gradation data is DG = (00000000), VS = VG2 = V0 is output. When the gradation data is DG = (00000011), a gradation voltage VS = V1- (V1-V2) / 2 between VG1 = V1 and VG2 = V2 is generated and output. When the gradation data is DG = (00000010), VS = VG1 = V1 is output.

  The switch circuit 54 is provided between the D / A conversion circuit 52 and the data line driving circuit 60. The switch circuit 54 may be a component of the D / A conversion circuit 52 or the data line driving circuit 60.

  The switch circuit 54 includes a plurality of switch elements. For example, FIG. 13 includes first to fourth switch elements SW1 to SW4. Note that the number of switch elements is not limited to this, and may be, for example, 8, 16 or the like. Each of the switch elements SW1 to SW4 can be composed of a CMOS transistor. Specifically, it can be constituted by a transfer gate composed of a P-type transistor and an N-type transistor. These transistors are turned on / off by a switch control signal from a switch control signal generation circuit (not shown).

  The switch element SW1 includes a first voltage output node NG1 that is an output node of the first gradation voltage VG1 of the D / A conversion circuit 52, and a first input of the gradation generation amplifier 62 (data line driving circuit 60). Provided with the node NI1. The switch element SW2 is provided between the second voltage output node NG2 that is the output node of the second gradation voltage VG2 of the D / A conversion circuit 52 and the input node NI1 of the gradation generation amplifier 62. These switch elements SW1 and SW2 are exclusively turned on / off. For example, as shown in FIG. 14, when the gradation data is DG = (00000000), SW1 is turned off while SW2 is turned on. When DG = (00000001), SW1 is turned on while SW2 is turned on. Turns off.

  The switch element SW3 is provided between the voltage output node NG1 of the D / A conversion circuit 52 and the input node NI2 of the gradation generation amplifier 62. The switch element SW4 is provided between the voltage output node NG2 of the D / A conversion circuit 52 and the input node NI2 of the gradation generation amplifier 62. These switch elements SW3 and SW4 are exclusively turned on / off. For example, when DG = (00000001), SW3 is turned off while SW4 is turned on. When DG = (00000010), SW3 is turned on while SW4 is turned off.

  As shown in FIG. 14, when the gradation data is DG = (00000000), the D / A conversion circuit 52 outputs VG1 = V1 and VG2 = V0. Further, the switch elements SW1, SW2, SW3, and SW4 of the switch circuit 54 are turned off, on, off, and on, respectively. Therefore, VI1 = VG2 = V0 and VI2 = VG2 = V0 are input to the input nodes NI1 and NI2 of the gradation generation amplifier 62, respectively. As a result, the gradation generation amplifier 62 outputs a gradation voltage (sampling voltage) VS = V0.

  On the other hand, when the gradation data is DG = (00000001), the switch elements SW1, SW2, SW3, and SW4 are turned on, off, off, and on, respectively. Therefore, the gradation generation amplifier 62 receives VI1 = VG1 = V1 and VI2 = VG2 = V0 at its input nodes NI1 and NI2, and outputs the gradation voltage VS = V0− (V0−V1) / 2. That is, a gradation voltage corresponding to gradation data DG = (00000001) is output.

  When the gradation data is DG = (00000010), the D / A conversion circuit 52 outputs VG1 = V1 and VG2 = V2. The switch elements SW1, SW2, SW3, and SW4 are turned on, off, on, and off, respectively. Therefore, the gradation generation amplifier 62 receives VI1 = VG1 = V1 and VI2 = VG1 = V1 at its input nodes NI1 and NI2, and outputs the gradation voltage VS = V1.

  On the other hand, when the gradation data is DG = (00000011), the switch elements SW1, SW2, SW3, and SW4 are turned off, on, on, and off, respectively. Therefore, the gradation generation amplifier 62 receives VI1 = VG2 = V2 and VI2 = VG1 = V1 at its input nodes NI1 and NI2, and outputs the gradation voltage VS = V1− (V1−V2) / 2. That is, the gradation voltage corresponding to the gradation data DG = (00000011) is output.

  As is apparent from FIG. 14, the switch elements SW1 to SW4 are turned on / off based on the lower bits of the gradation data DG. That is, the switch elements SW1 to SW4 are turned on / off based on the switch control signal generated based on the lower bits of the gradation data DG. For example, when the lower bits D1 and D0 of the gradation data DG are (00), the switch elements SW1, SW2, SW3, and SW4 are turned off, on, off, and on, respectively, as shown in FIG. , (01), on, off, off, on respectively. In the case of (10), it is on, off, on and off, and in the case of (11), it is off, on, on and off.

  According to the data driver described above, since the gradation voltage can be generated by the gradation generation amplifier 62, the number (type) of gradation voltages generated by the gradation voltage generation circuit 110 in FIG. 1 can be reduced. As a result, the number of gradation voltage lines can be reduced, and the circuit scale of the D / A conversion circuit 52 can be reduced.

For example, when the gradation data DG is 8 bits and the number of gradations is 2 ⁸ = 256 gradations, the gradation voltage generation circuit 110 needs to generate 256 gradation voltages in the conventional method. The D / A conversion circuit 52 requires a selector group for selecting a gray scale voltage corresponding to the gray scale data DG from these 256 gray scale voltages. Therefore, the gradation voltage generation circuit 110 and the D / A conversion circuit 52 are increased in scale. In addition, since the number of gradation voltage lines is 256, the area occupied by the wiring region also increases.

  In this regard, according to the data driver of FIG. 13, since the gradation voltage is generated by the gradation generation amplifier 62, the gradation voltage generation circuit 110 may generate, for example, 128 gradation voltages. The conversion circuit 52 may be provided with a selector group for selecting a voltage from among these 128 gradation voltages. Therefore, the circuit scale can be greatly reduced as compared with the conventional method. Further, the number of gradation voltage lines can be reduced to 128, and the area of the wiring region can be greatly reduced. Actually, since the gradation generation amplifier 62 generates a voltage obtained by dividing the first and second gradation voltages VG1 and VG2, 128 + 1 = 129 gradation voltage lines are required in the above case.

  Further, according to the data driver of FIG. 13, the tone generation amplifier 62 can be provided with a sample hold function. Therefore, a voltage with little variation can be supplied to the data line without performing DAC driving in which the data line is directly driven by the D / A conversion circuit 52. That is, a highly accurate voltage can be supplied to the data line with a relatively small and simple circuit configuration. Further, by providing the tone generation amplifier 62 with a sample and hold function, a configuration in which one D / A conversion circuit 52 is shared by a plurality of data line driving circuits 60 becomes possible, and the circuit can be further reduced in scale. .

  Further, according to the data driver of FIG. 13, the switch circuit 54 is provided between the D / A conversion circuit 52 and the data line driving circuit 60. Therefore, based on the first and second gradation voltages VG1 and VG2 from the D / A conversion circuit 52, for example, as shown in FIG. 14, (VI1, VI2) = (V0, V0), (V1, V0). , (V1, V1), (V2, V1)... Can be input to the gradation generation amplifier 62. Thereby, the gradation generation amplifier 62 is monotonously decreased (or monotonically increased), for example, VS = V0, V0− (V0−V1) / 2, V1, V1− (V1−V2) / 2, V2. Therefore, it is possible to output an appropriate gradation voltage with a simple circuit configuration.

6). Flip Around Sample / Hold Circuit The gradation generation amplifier 62 can be configured by a so-called flip around sample / hold circuit. Here, the flip-around type sample-and-hold circuit, for example, samples the charge according to the input voltage in the sampling capacitor in the sampling period, and performs the flip-around operation of the sampling capacitor in the hold period and accumulates it. This is a circuit that outputs a voltage corresponding to the charge to its output node.

  The flip-around sample-and-hold circuit will be described in more detail with reference to FIGS. 15 (A) and 15 (B).

  For example, in FIG. 15A and FIG. 15B, the gradation generation amplifier 62 configured by a flip-around sample-and-hold circuit includes an operational amplifier OP1 and first and second sampling capacitors CS1 and CS2 (a plurality of sampling amplifiers CS1 and CS2). Sampling capacitors).

  The sampling capacitor CS1 is provided between the inverting input terminal (first input terminal) of the operational amplifier OP1 and the input node NI1 of the gradation generation amplifier 62. As shown in FIG. 15A, charge corresponding to the input voltage VI1 of the input node NI1 is accumulated in the capacitor CS1 in the sampling period.

  The sampling capacitor CS2 is provided between the inverting input terminal of the operational amplifier OP1 and the input node NI2 of the gradation generation amplifier 62. The capacitor CS2 accumulates charges according to the input voltage VI2 of the input node NI2 during the sampling period.

  As shown in FIG. 15A, in the sampling period, the output of the operational amplifier OP1 is fed back to the node NEG of the inverting input terminal of OP1. The non-inverting input terminal (second input terminal) of the operational amplifier OP1 is set to AGND. Therefore, the node NEG to which one ends of the capacitors CS1 and CS2 are connected is set to AGND by the imaginary short function of the operational amplifier OP1. As a result, charges corresponding to the input voltages VI1 and VI2 are accumulated in the capacitors CS1 and CS2.

  AGND is set (adjusted) to a voltage between the high potential side power supply voltage VDDHS and the low potential side power supply voltage VSS (intermediate) of the operational amplifier OP1. Specifically, for example, AGND = VSS + (VDDHS + VSS) / ML is set. If VSS = 0V and ML = 2, then AGND = (VDDHS + VSS) / 2. The coefficient ML does not necessarily need to be ML = 2, and can be adjusted as appropriate according to display characteristics and the like, and it is sufficient that at least ML> 1.

  The power supply voltage VDDHS is, for example, a voltage supplied to the source of the high-potential side P-type transistor of the operational amplifier OP1, and the power supply voltage VSS is a voltage supplied to the source of the low-potential side N-type transistor. . The operational amplifier OP1 operates using these VDDHS and VSS as operation power supply voltages.

  As shown in FIG. 15B, in the hold period, the gradation generation amplifier 62 outputs the output voltage VQG (= VS) corresponding to the charges accumulated in the sampling capacitors CS1 and CS2 in the sampling period as its output node. Output to NQG. Specifically, a flip-around operation is performed in which the other ends of the capacitors CS1 and CS2, which are connected to the node NEG at one end thereof, are connected to the output terminal of the operational amplifier OP1, thereby depending on the charges accumulated in CS1 and CS2. Output voltage VQG.

  If the gradation generating amplifier 62 is configured by the flip-around sample-and-hold circuit as described above, so-called offset free can be realized.

  For example, the offset voltage generated between the inverting input terminal and the non-inverting input terminal of the operational amplifier OP1 is VOF, AGND is temporarily set to 0V for simplicity of explanation, and the input voltage during the sampling period is set to VI1 = VI2 = VI. Let CS be the parallel capacitance value of capacitors CS1 and CS2 connected in parallel. Then, the charge Q accumulated in the sampling period is expressed by the following equation.

Q = (VI−VOF) × CS (1)
On the other hand, when the voltage of the node NEG in the hold period is VX and the output voltage is VQG, the charge Q ′ accumulated in the hold period is expressed by the following equation.

Q ′ = (VQG−VX) × CS (2)
When the amplification factor of the operational amplifier OP1 is A, VQG is expressed as the following equation.

VQG = −A × (VX−VOF) (3)
Then, since Q = Q ′ by the law of charge conservation, the following equation is established.

(VI−VOF) × CS = (VQG−VX) × CS (4)
Therefore, according to the above equations (3) and (4),
VQG = VI-VOF + VX = VI-VOF + VOF-VQG / A
Is established. Therefore, the output voltage VQG of the gradation generation amplifier 62 is expressed by the following equation.

VQG = {1 / (1 + 1 / A)} × VI (5)
As apparent from the above equation (5), the output voltage VQG of the gradation generation amplifier 62 does not depend on the offset voltage VOF, and the offset can be canceled, so that offset free can be realized.

  FIGS. 16A and 16B show a detailed configuration example of the gradation generation amplifier 62 using a flip-around sample-and-hold circuit. The gradation generation amplifier 62 shown in FIGS. 16A and 16B includes an operational amplifier OP1, first and second sampling switch elements SS1 and SS2, and first and second sampling capacitors CS1, It includes CS2, a feedback switch element SFG, and first and second flip-around switch elements SA1 and SA2. An output switch element SQG is also included. It should be noted that modifications such as omitting some of these components or adding other components are possible. In addition, the switch elements SS1, SS2, SA1, SA2, SFG, and SQG can be configured by CMOS transistors such as transfer gates, for example.

  AGND is set to the non-inverting input terminal (second input terminal) of the operational amplifier OP1. The sampling switch element SS1 and the sampling capacitor CS1 are provided between the input node NI1 of the gradation generation amplifier 62 and the inverting input terminal (first input terminal) of the operational amplifier OP1. The sampling switch element SS2 and the sampling capacitor CS2 are provided between the input node NI2 of the gradation generation amplifier 62 and the inverting input terminal of the operational amplifier OP1.

  The feedback switch element SFG is provided between the output terminal of the operational amplifier OP1 and the inverting input terminal of OP1.

  The flip-around switch element SA1 is provided between the first connection node NS1 between the switch element SS1 and the capacitor CS1 and the output terminal of the operational amplifier OP1. The flip-around switch element SA2 is provided between the second connection node NS2 between the switch element SS2 and the capacitor CS2 and the output terminal of the operational amplifier OP1.

  As shown in FIG. 16A, in the sampling period, the sampling switch elements SS1 and SS2 and the feedback switch element SFG are turned on, and the flip-around switch elements SA1 and SA2 are turned off.

  On the other hand, as shown in FIG. 16B, in the hold period, the sampling switch elements SS1 and SS2 and the feedback switch element SFG are turned off, and the flip-around switch elements SA1 and SA2 are turned on.

  The output switch element SQG is provided between the output terminal of the operational amplifier OP1 and the output node NQG of the gradation generation amplifier 62. As shown in FIG. 16A, the output switch element SQG is turned off in the sampling period. This makes it possible to prevent the output of the gradation generation amplifier 62 from entering a high impedance state and transmitting an uncertain voltage during the sampling period to the subsequent stage.

  On the other hand, as shown in FIG. 16B, the output switch element SQG is turned on in the hold period. Thereby, the voltage VQG which is the gradation voltage generated in the sampling period can be output.

  Next, the circuit operation of FIGS. 16A and 16B will be described with reference to FIG. The first gradation voltage VG1 from the D / A conversion circuit 52 is input to the node NG1, and the second gradation voltage VG2 having a voltage level different from that of VG1 is input to the node NG2.

  One of the switch elements SW1 and SW2 of the switch circuit 54 is exclusively turned on according to the gradation data DG. Any one of the switch elements SW3 and SW4 is exclusively turned on according to the gradation data DG.

  In the sampling period, the switch control signals input to the sampling switch elements SS1 and SS2 and the feedback switch element SFG are active (H level), so that the switch elements SS1, SS2, and SFG are turned on. On the other hand, since the switch control signals input to the flip-around switch elements SA1 and SA2 and the output switch element SQG become inactive (L level), the switch elements SA1, SA2 and SQG are turned off.

  In the hold period, the switch control signals input to the switch elements SS1, SS2, and SFG are inactive, and thus SS1, SS2, and SFG are turned off. On the other hand, since the switch control signal input to the switch elements SA1, SA2, and SQG becomes active, SA1, SA2, and SQG are turned on.

  As shown in A1 and A2 of FIG. 17, the sampling switch elements SS1 and SS2 are turned off after the feedback switch element SFG is turned off. In this way, adverse effects of charge injection can be minimized. As indicated by A3, the flip-around switch elements SA1 and SA2 and the output switch element SQG are turned on after the sampling switch elements SS1 and SS2 are turned off.

  For example, FIG. 18A shows an example of a transfer gate TG serving as a switch element. Switch control signals CNN and CNP are input to the gates of the N-type transistor TN and the P-type transistor TP constituting the transfer gate TG. When the transfer gate TG is turned off, clock feedthrough occurs due to parasitic capacitances Cgd and Cgs between the gate and the drain or between the gate and the source. In addition, when the transfer gate TG is turned off, the channel charge flows into the drain and the source, and charge injection occurs.

  In this regard, in this embodiment, the sampling switch elements SS1 and SS2 are turned off as shown in FIG. 18C after the feedback switch element SFG is turned off as shown in FIG. 18B. , Adverse effects due to charge injection and clock feedthrough can be reduced.

  That is, as shown in FIG. 18B, if the switch element SFG is turned off when the switch elements SS1 and SS2 are on, the switch element SFG is affected by charge injection and clock feedthrough. However, as shown in FIG. 18C, at the timing when the switch elements SS1 and SS2 are turned off, the switch element SFG is turned off and the node NEG is in a high impedance state. Therefore, since it is not affected by the clock feedthrough and charge injection at SS1 and SS2, the adverse effects due to charge injection and feedthrough can be reduced.

  Note that switch control signals CNN and CNP having an amplitude of VDDHS to VSS are input to the gates of the transistors TN and TP of the transfer gate TG in FIG. Accordingly, when the drain or source potential of the transfer gate TG is set to VSS or VDDHS, an imbalance occurs between the charge amount from the N-type transistor TN and the charge amount from the P-type transistor TP, and the charge due to charge injection cancels out. It will remain without being.

  In this regard, immediately before the switching element SFG is turned off as shown in FIG. 18B, the non-inverting input terminal of the operational amplifier OP1 is set to AGND which is an intermediate voltage between VDDHS and VSS, and the operational amplifier OP1 is imaginary. The potential of the node NEG is set to AGND = (VDDHS + VSS) / 2 by the null short function. Therefore, immediately before the switch element SFG is turned off, the source and drain of the SFG are set to AGND, there is no dependency of the input gradation voltage, and the charge amount from the N-type transistor of the transfer gate TG and the P-type transistor Therefore, the adverse effect of charge injection caused by the switching element SFG being turned off can be minimized.

7). Electronic Device FIGS. 19A and 19B show configuration examples of an electronic device and an electro-optical device 500 including the integrated circuit device 10 of this embodiment. Note that various modifications may be made such as omitting some of the components shown in FIGS. 19A and 19B or adding other components (such as a camera, an operation unit, or a power supply). . The electronic device of the present embodiment is not limited to a mobile phone, and may be a digital camera, a PDA, an electronic notebook, an electronic dictionary, a television, a projector, or a portable information terminal.

  19A and 19B, the host device 410 is, for example, an MPU, a baseband engine, or the like. The host device 410 controls the integrated circuit device 10 that is a display driver. Alternatively, processing as an application engine or baseband engine, or processing as a graphic engine such as compression, decompression, or sizing can be performed. Also, the image processing controller 420 in FIG. 19B performs processing as a graphic engine such as compression, decompression, and sizing on behalf of the host device 410.

  In the case of FIG. 19A, the integrated circuit device 10 having a built-in memory can be used. That is, in this case, the integrated circuit device 10 once writes the image data from the host device 410 into the built-in memory, reads the written image data from the built-in memory, and drives the electro-optical panel. On the other hand, in the case of FIG. 19B, an integrated circuit device 10 without a memory can be used. That is, in this case, the image data from the host device 410 is written into the built-in memory of the image processing controller 420. The integrated circuit device 10 drives the electro-optical panel 400 under the control of the image processing controller 420.

  Although the present embodiment has been described in detail as described above, it will be easily understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. Accordingly, all such modifications are intended to be included in the scope of the present invention. For example, in the specification or the drawings, terms (inverted input terminals, non-inverted input terminals, etc.) described at least once together with different terms having a broader meaning or the same meaning (first input terminal, second input terminal, etc.) are: The different terms can be used anywhere in the specification or drawings. Further, the configurations and operations of the integrated circuit device, the electro-optical device, the electronic apparatus, and the like are not limited to those described in this embodiment, and various modifications can be made.

2 is a circuit configuration example of the integrated circuit device of the present embodiment. 2A and 2B are configuration examples of a power supply circuit and a gradation voltage generation circuit. 6 is a layout arrangement example of the integrated circuit device of the present embodiment. 4A and 4B are explanatory diagrams of an integrated circuit device of a comparative example of this embodiment. 4 shows a detailed layout arrangement example of an integrated circuit device. Explanatory drawing of the data transfer between a data driver block and a memory block. Configuration example of a pre-latch circuit, a post-latch circuit, and a data driver block. 8 is a signal waveform example illustrating the operation of the configuration in FIG. Other configuration examples of the pre-latch circuit, the post-latch circuit, and the data driver block. Configuration example of data driver. 2 shows a second configuration example of a data driver. The signal waveform example for demonstrating operation | movement of a data driver. A modification of the data driver. FIG. 5 is an operation explanatory diagram of a D / A conversion circuit, a switch circuit, and a gradation generation amplifier. 15A and 15B are explanatory diagrams of a flip-around sample-and-hold circuit. 16A and 16B are configuration examples of a gradation generation amplifier using a flip-around sample-and-hold circuit. Explanatory drawing of the circuit operation | movement of a gradation generation amplifier. 18A to 18C are explanatory diagrams of the switch control method of the present embodiment. FIG. 19A and FIG. 19B are configuration examples of electronic devices.

Explanation of symbols

MB1-MB10 memory block, DB1-DB10 data driver block,
DR data driver, PB power supply circuit, AR AGND output circuit,
LTA1 to LTA6 pre-latch circuit,
LTB1 to LTB6 post-latch circuit, SDB0 to SDB6 sub-driver block, 10 integrated circuit device, 20 memory, 22 memory cell array,
24 row address decoder, 26 column address decoder,
28 write / read circuit, 40 logic circuit, 42 control circuit,
44 display timing control circuit, 46 host interface circuit,
48 RGB interface circuit, 50 data driver,
52 D / A conversion circuit, 54 switch circuit,
60 60-1 to 60-L data line drive circuit, 62, 62-1 to 62-L gradation generation amplifier,
64 64-1 to 64-L drive amplifier, 70 scan driver,
90 power supply circuit, 92 booster circuit, 100 VCOM generation circuit, 102 control circuit,
104 output circuit, 110 gradation voltage generation circuit, 112 ladder resistance circuit,
114 adjustment register, 400 electro-optic panel, 410 host device,
420 image processing controller, 500 electro-optical device

Claims (17)

First to Nth (N is an integer of 2 or more) memory blocks arranged along the first direction and storing image data;
When the direction orthogonal to the first direction is the second direction, the first direction to the Nth memory block are arranged along the first direction in the second direction of the electro-optical device. Including first to Nth data driver blocks for supplying data signals to a plurality of data lines,
Of the first to Nth memory blocks, the Jth memory block (J is an integer satisfying 1 ≦ J ≦ N) is
Sub-pixel image data, which is image data for at least one sub-pixel, is read out dot-sequentially and output in a time-sharing manner to the corresponding J-th data driver block among the first to N-th data driver blocks. ,
The Jth data driver block is:
An integrated circuit device, wherein the subpixel image data is received from the Jth memory block, and a data signal corresponding to the subpixel image data is output. In claim 1,
Between the Jth memory block and the Jth data driver block, a k-bit (k is a natural number) data transfer bus for transferring the subpixel image data in a time-sharing manner is wired. An integrated circuit device. In claim 1 or 2,
The integrated circuit device, wherein a center position of the Jth memory block and the Jth data driver block are shifted in the first direction. In any one of Claims 1 thru | or 3,
A gradation voltage generation circuit that generates a plurality of gradation voltages and supplies the gradation voltages to the first to Nth data driver blocks;
When the direction opposite to the second direction is the fourth direction, the grayscale voltage generation circuit is in the first direction of the Nth memory block and the Nth data driver block. An integrated circuit device arranged in the fourth direction. In any one of Claims 1 thru | or 4,
When the direction opposite to the first direction is the third direction, a plurality of scanning signal pads for supplying scanning signals to the plurality of scanning lines of the electro-optical device are provided in the first memory block. An integrated circuit device arranged in the second direction and in the third direction of the first data driver block. In any one of Claims 1 thru | or 5,
First to Nth pre-latch circuits;
Including first to Nth post-latch circuits;
The J-th pre-latch circuit among the first to N-th pre-latch circuits is:
Sequentially latching the subpixel image data output in a time-sharing manner from the Jth memory block;
The J-th post-latch circuit among the first to N-th post-latch circuits is
After the sub-pixel image data is latched by the J-th pre-latch circuit, the latched sub-pixel image data is line-sequentially read from the J-th pre-latch circuit and latched, and output to the J-th data driver block An integrated circuit device. In claim 6,
The J-th pre-latch circuit is
Sequentially latching the subpixel image data of the first color component output in a time-sharing manner from the Jth memory block;
The Jth post-latch circuit includes:
After the subpixel image data of the first color component is latched by the Jth pre-latch circuit, the latched subpixel image data of the first color component is read out line-sequentially from the Jth pre-latch circuit. Latch and
The J-th pre-latch circuit is
Next, the subpixel image data of the second color component output in a time division manner from the Jth memory block is sequentially latched,
The Jth post-latch circuit includes:
After latching the sub-pixel image data of the second color component in the J-th pre-latch circuit, the latched sub-pixel image data of the second color component is read out line-sequentially from the J-th pre-latch circuit. Latch and
The J-th pre-latch circuit is
Next, the sub-pixel image data of the third color component output in a time division manner from the Jth memory block is sequentially latched,
The Jth post-latch circuit includes:
After latching the sub-pixel image data of the third color component in the J-th pre-latch circuit, the latched sub-pixel image data of the third color component is read out line-sequentially from the J-th pre-latch circuit. An integrated circuit device characterized by latching. In claim 7,
The Jth data driver block is:
When the subpixel image data of the first color component is latched by the Jth post-latch circuit, a signal corresponding to the latched subpixel image data of the first color component is sampled.
When the subpixel image data of the second color component is latched by the Jth post-latch circuit, a signal corresponding to the latched subpixel image data of the second color component is sampled,
When the subpixel image data of the third color component is latched by the Jth post-latch circuit, a signal corresponding to the latched subpixel image data of the third color component is sampled. Integrated circuit device. In any one of Claims 1 thru | or 8.
The Jth data driver block is:
An integrated circuit device, wherein each sub-driver block includes a plurality of sub-driver blocks that output data signals corresponding to at least one pixel based on the sub-pixel image data from the J-th memory block. In claim 9,
Each of the sub-driver blocks is
Receiving the gradation data, the first and second gradation voltages corresponding to the gradation data are output in a time-sharing manner during each sampling period of the first to Lth sampling periods (L is an integer of 2 or more). A D / A conversion circuit;
Including first to Lth data line driving circuits sharing the D / A conversion circuit;
Each data line driving circuit of the first to Lth data line driving circuits is:
The first and second gradation voltages output from the D / A conversion circuit in each sampling period of the first to Lth sampling periods are sampled, and the first gradation voltage and the second gradation voltage are sampled. An integrated circuit device comprising a gradation generation amplifier that generates a gradation voltage between gradation voltages. In claim 10,
2. The integrated circuit device according to claim 1, wherein the gradation generation amplifier includes a flip-around sample / hold circuit. In claim 11,
The gradation generation amplifier is
An operational amplifier;
A first input terminal provided between a first input terminal of the operational amplifier and a first input node of the grayscale generation amplifier, wherein charge corresponding to an input voltage of the first input node is accumulated in a sampling period; A sampling capacitor,
Provided between the first input terminal of the operational amplifier and the second input node of the grayscale generation amplifier, and charge corresponding to the input voltage of the second input node is accumulated during the sampling period. A second sampling capacitor;
An integrated circuit device, wherein an output voltage corresponding to the electric charge accumulated in the first and second sampling capacitors in the sampling period is output in the hold period. In claim 11,
The gradation generation amplifier is
An operational amplifier whose analog input voltage is supplied to its second input terminal;
A first sampling switch element and a first sampling capacitor provided between a first input node of the gradation generation amplifier and a first input terminal of the operational amplifier;
A second sampling switch element and a second sampling capacitor provided between a second input node of the gradation generation amplifier and the first input terminal of the operational amplifier;
A feedback switch element provided between an output terminal of the operational amplifier and the first input terminal;
A first flip-around switch element provided between a first connection node between the first sampling switch element and the first sampling capacitor and the output terminal of the operational amplifier; ,
A second flip-around switch element provided between a second connection node between the second sampling switch element and the second sampling capacitor and the output terminal of the operational amplifier; An integrated circuit device comprising: In claim 13,
In the sampling period, the first and second sampling switch elements and the feedback switch element are turned on, and the first and second flip-around switch elements are turned off.
In the hold period, the first and second sampling switch elements and the feedback switch element are turned off, and the first and second flip-around switch elements are turned on. Circuit device. In claim 14,
The integrated circuit device, wherein the first and second sampling switch elements are turned off after the feedback switch element is turned off.   An electro-optical device comprising the integrated circuit device according to claim 1.   An electronic apparatus comprising the electro-optical device according to claim 16.

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