WO2004100119A1 - 電流出力型半導体回路、表示駆動用ソースドライバ、表示装置、電流出力方法 - Google Patents
電流出力型半導体回路、表示駆動用ソースドライバ、表示装置、電流出力方法 Download PDFInfo
- Publication number
- WO2004100119A1 WO2004100119A1 PCT/JP2004/006179 JP2004006179W WO2004100119A1 WO 2004100119 A1 WO2004100119 A1 WO 2004100119A1 JP 2004006179 W JP2004006179 W JP 2004006179W WO 2004100119 A1 WO2004100119 A1 WO 2004100119A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- current
- output
- voltage
- precharge
- signal
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
- G09G3/3241—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
- G09G3/325—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
- H03M1/68—Digital/analogue converters with conversions of different sensitivity, i.e. one conversion relating to the more significant digital bits and another conversion to the less significant bits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
- H03M1/74—Simultaneous conversion
- H03M1/742—Simultaneous conversion using current sources as quantisation value generators
- H03M1/745—Simultaneous conversion using current sources as quantisation value generators with weighted currents
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/08—Details of timing specific for flat panels, other than clock recovery
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/10—Special adaptations of display systems for operation with variable images
- G09G2320/103—Detection of image changes, e.g. determination of an index representative of the image change
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/04—Changes in size, position or resolution of an image
- G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
- G09G2340/0428—Gradation resolution change
Definitions
- the present invention relates to a driving semiconductor circuit that outputs current and is used for a display device that performs grayscale display based on the amount of current, such as an organic electroluminescent element.
- Organic light-emitting elements are self-luminous elements, so they do not require the backlight required for liquid crystal display devices, and are expected to be next-generation display devices because of their advantages such as a wide viewing angle.
- FIG. 4 is a cross-sectional view of a device structure of a general organic light-emitting device.
- the organic layer 42 is sandwiched between the cathode 41 and the anode 43.
- a DC power supply 44 is connected to this, holes are injected from the anode 43 and electrons are injected from the cathode 41 into the organic layer 42.
- the injected holes and electrons move in the organic layer 42 to the opposite electrode by the electric field formed by the power supply 44.
- electrons and holes recombine in the organic layer 42 to generate excitons.
- Light emission is observed in the process of deactivating the exciton energy.
- the emission color differs depending on the energy of the excitons, and becomes light having a wavelength of energy corresponding to the value of the energy band gap of the organic layer 42.
- At least one of the electrodes is made of a material that is transparent in the visible light region.
- a material with a low work function is used to facilitate electron injection into the organic layer.
- aluminum, magnesium, calcium, etc. Durability, more Materials such as these alloys and aluminum-lithium alloys are sometimes used to lower the work function.
- the anode used has a large ionization potential because of the ease of hole injection. Also, since the cathode has no transparency, a transparent material is often used for this electrode. Therefore, generally, ITO (Indium Tin Oxide), gold, indium zinc oxide (IZO) and the like are used.
- the organic layer 42 may be composed of a plurality of layers in order to increase luminous efficiency. This makes it possible for each layer to share the functions of carrier injection, carrier transfer to the light-emitting region, and emission of light having a desired wavelength. By using efficient materials for each layer, higher efficiency can be achieved. It becomes possible to produce an organic light emitting device.
- the luminance is proportional to the current as shown in Fig. 5 (a), and has a non-linear relationship with the voltage as shown in Fig. 5 (b). . Therefore, in order to perform gradation control, it is better to control the current value.
- the active matrix type there are two types, the voltage drive method and the current drive method.
- the voltage drive method uses a voltage output type source driver, converts the voltage into a current inside the pixel, and supplies the converted current to the organic light emitting device.
- the current drive method uses a current output type source driver, and has only the function of holding the current value output for one horizontal scanning period inside the pixel. In this method, the same current value as that of the driver is supplied to the organic light emitting device.
- Fig. 6 shows an example of the current drive method.
- the method shown in FIG. 6 uses a power copying method for the pixel circuit.
- FIG. 7 shows a circuit when the pixel 67 of FIG. 6 operates.
- the gate signal line 61a of the row is turned on by the gate driver 35 so that the switch is turned on and the gate signal line 61b is turned off by the gate driver 35.
- a signal is output.
- the state of the pixel circuit at this time is shown in Fig. 7 (a).
- the current flowing through the source signal line 60 which is the current drawn into the source driver 36, flows through the path indicated by the dotted line 71. Therefore, the same current as the current flowing through the source signal line 60 flows through the transistor 62. Then, the potential of the node 72 becomes a potential according to the current-voltage characteristics of the transistor 62.
- FIGS. 7 (a) and (b) the potential of the node 72 does not change. Therefore, the drain current flowing through the same transistor 62 is the same in FIGS. 7 (a) and 7 (b). As a result, a current having the same value as the current flowing through the source signal line 60 flows through the organic light emitting element 63. Even if there is a variation in the current-voltage characteristics of the transistor 62, the values of the currents 71 and 73 are not affected in principle, and a uniform display can be realized without being affected by the variation in the characteristics of the transistor.
- the source driver 36 must be a current output type driver IC.
- Figure 1 shows an example of the output stage of a current driver IC that outputs a current value according to the gradation. 0 is shown.
- analog current output is performed from 104 by the digital-analog converter 106.
- the analog-to-digital converter is composed of a plurality (at least 54 bits of gradation data) of gradation display current sources 103 and switches 108, and one gradation display current source 103 Is composed of a common good line 107 that defines the value of the current flowing through.
- an analog current is output for a 3-bit input 105.
- the number of current sources 103 according to the bit weights to be connected to the current output 104 by using the switch 108, for example, in the case of data 1, one current source 103 is connected.
- a current corresponding to the gradation can be output, such as a current for one minute, and seven data for data 7.
- a current output type driver can be realized.
- the voltage of the common gate line 107 is determined by the distribution mirror transistor 102.
- the transistor 102 and the current source group 103 have a current mirror configuration, and the current per gradation is determined according to the value of the reference current 89. With this configuration, the output current changes depending on the gray scale, and the current per gray scale is determined by the reference current.
- FIGS. 21 to 23 show examples of a display device using an organic light-emitting element.
- Fig. 21 shows a perspective view of the television (Fig. 21 (a) and its constituent blocks (Fig. 21 (b))
- Fig. 22 shows a digital camera or digital video camera
- Fig. 23 shows a portable information terminal.
- the organic light-emitting element is a display panel suitable for these display devices that often display moving images because of their high response speed (see, for example, JP-A-2001-1476959).
- the same number of transistors 103 of the same size are arranged in parallel, and the number of transistors 103 connected to the output for input data is changed.
- an output corresponding to each gradation is subjected to gamma correction and output.
- a voltage value corresponding to each gradation is required.
- the voltage corresponding to gamma correction Since the output is adjusted to the voltage value that will be output, gamma correction has been performed even with a 6-bit driver, and sufficient gradation display is possible.
- This problem is unique to the combination of a current driver whose gray scale is proportional to the output current and a current output type display device whose luminance is proportional to the input current.
- the output of the current driver is added from 6 bits to 8 bits, gamma processing is performed before inputting the source driver, and the gamma processed 8-bit signal is input to the source driver Can be considered.
- the number of wires increases, and, for example, as shown in FIG. 3, the number of wires between the control IC 31 and the source driver IC 36 for the display panel 33 increases. For this reason, there has been a problem that the cost is increased, for example, the size of the flexible substrate 32 becomes large or a multilayer substrate is used.
- the present invention provides a current output type semiconductor circuit capable of suppressing a circuit size from increasing even if the number of output bits of a current driver is increased.
- An object of the present invention is to provide a display driving source driver, a display device, and a current output method.
- Another object of the present invention is to provide a current output type semiconductor device having a reduced number of wirings, a display driving source driver using the same, a display device, and a signal input / output method.
- a first aspect of the present invention has a first unit transistor that outputs a predetermined current and outputs lower N bits (N is a natural number).
- N is a natural number.
- a second unit transistor that outputs a higher-order M (M is a natural number, (N + M) ⁇ 3) bits and has a second unit transistor that outputs a current larger than the predetermined current.
- M is a natural number, (N + M) ⁇ 3) bits and has a second unit transistor that outputs a current larger than the predetermined current.
- a current output type semiconductor circuit (M is a natural number, (N + M) ⁇ 3) bits and has a second unit transistor that outputs a current larger than the predetermined current.
- a second aspect of the present invention is the current output type semiconductor circuit according to the first aspect of the present invention, wherein the current output by the first unit transistor is N N of the current output by the second unit transistor. is there.
- the channel length of the first unit transistor is L 1
- the channel width is W 1
- the channel length of the second unit transistor is L 2
- the channel width is W Assuming that 2, L 1 XW 1 ⁇ L 2 XW 2 is the current output type semiconductor circuit according to the first aspect of the present invention.
- the L 2 XW 2 is a maximum value among values in which a variation in output current of the second unit transistor is equal to or less than an allowable value of variation in output current of the first unit transistor.
- a fifth aspect of the present invention is the current output type semiconductor circuit according to the first aspect of the present invention, wherein M is 6, and N is 2.
- a sixth aspect of the present invention is a display driving source driver including the current output type semiconductor circuit of the first aspect of the present invention.
- a seventh aspect of the present invention is a display device, comprising: the source driver for display driving according to the sixth aspect of the present invention; and a current driving type pixel connected to the source driver.
- a step of outputting a current is provided.
- a driver having a drive signal signal output stage for outputting at least a drive current signal
- a control circuit configured separately from the driver and configured to generate at least a video signal and a command data signal for various controls
- the video signal and the command data signal are output from the control circuit via the same signal line, and the respective signals are output with a time lag from each other between ON and OFF of the power supply, and are input to the driver. And a current output type semiconductor device. .
- a tenth aspect of the present invention provides a driving driver having a driving signal signal output stage for outputting at least a driving current signal;
- a control circuit configured separately from the driver and configured to generate at least a video signal and a command data signal for various controls
- the video signals are output via the same signal line for each video signal corresponding to each of the three primary colors with a time lag between the power on and the power off, and are input to the driver.
- This is a current output type semiconductor device.
- a eleventh aspect of the present invention is the current output type semiconductor device according to the ninth or tenth aspect, further comprising a distribution circuit that distributes a signal input to the driver to the video signal and the command data signal. .
- a twelfth aspect of the present invention is a display device driving source driver including the ninth or tenth aspect of the current output type semiconductor device of the present invention.
- a thirteenth aspect of the present invention is a display device including the display device driving source driver according to the twenty-second aspect of the present invention.
- a fourteenth aspect of the present invention provides a step of outputting at least a drive current signal from a driver having a drive signal signal output stage.
- FIG. 1 is a diagram showing an input signal waveform of a current output type semiconductor circuit according to the present invention.
- FIG. 2 is a block diagram of the driver IC when it is possible to externally select whether to perform precharge for each dot video signal.
- 'FIG. 3 is a diagram showing a display panel using a plurality of source drivers IC.
- FIG. 4 is a diagram showing the structure of the organic light emitting device.
- (b) is a diagram showing current-voltage-luminance characteristics of the organic light emitting device.
- FIG. 6 is a diagram showing a circuit of an active matrix display device using a pixel circuit having a current copier configuration.
- (a) is a diagram showing the operation of the current copier circuit.
- FIG. 8 is a diagram showing an example of a constant current source circuit.
- FIG. 9 is a diagram illustrating a relationship between a precharge pulse, a precharge determination signal, and an output of an application determination unit.
- FIG. 10 is a diagram showing a circuit for outputting a current to each output of a conventional current output type driver.
- FIG. 11 is a diagram showing the relationship between the transistor size and the output current variation of the gray scale display current source 103 of FIG.
- FIG. 13 is a diagram showing a relationship between a current output at one output terminal, a precharge voltage application unit, and a switching switch.
- (a) is a diagram showing the relationship between the channel size and variation of the transistors constituting each transistor group.
- FIG. 15 is a diagram showing a relationship between a period for performing a precharge voltage and a period for outputting a current based on gradation data in one horizontal scanning period.
- FIG. 16 is a diagram showing a circuit configuration of an input section of a source driver capable of performing differential input.
- FIG. 3A is a diagram illustrating a relationship between gradation data and a precharge determination signal.
- FIG. 18 is a diagram illustrating a circuit that distributes an input serial current to each signal.
- FIG. 19 is a diagram showing the relationship between the variation in the output current between adjacent terminals and the gradation in the source driver using the output stage shown in FIGS. 25 and 14 (a).
- FIG. 20 is a diagram showing a pixel circuit using a power lent copier when an n-type transistor is used.
- FIG. 22 is a diagram showing a case where the present invention is applied to a digital camera as a display device using the embodiment.
- FIG. 23 is a diagram showing a case where the display device using the embodiment of the present invention is applied to a portable information terminal.
- FIG. 24 is a diagram showing the concept of the current output unit of the semiconductor circuit using the embodiment of the present invention.
- FIG. 25 is a diagram showing a case where the current source is configured by a transistor in the configuration of FIG.
- FIG. 26 is a diagram showing the relationship between the gray scale of an input signal and the output current by the current output unit shown in FIG. 24 or FIG.
- FIG. 9 is a diagram illustrating a current output stage that performs grayscale display by the number of transistors.
- FIG. 28 is a diagram showing a time chart at the time of data transfer when the number of input signal lines of the source driver is reduced by serially inputting data for each color at high speed.
- FIG. 29 is a diagram showing a time chart at the time of command transfer when the number of input signal lines of the source driver is reduced by serially inputting data for each color at high speed.
- FIG. 30 is a diagram showing the transfer order of FIGS. 28 and 29 in one horizontal scanning period.
- FIG. 31 is a diagram showing the E line of the EL power supply line in FIG. 6 or FIG.
- FIG. 32 shows the relationship between the magnitude of the current between the lower 2 bits and the upper 6 bits for an 8-bit video input, adjusted by the transistor channel width, and the current is varied by the number of transistors in each bit.
- FIG. 9 is a diagram showing a configuration in which a current source can be further added to a current source corresponding to the most significant bit in the configuration of the output stage.
- FIG. 33 is a diagram showing a current difference between the gray scales 127 and 128.
- Fig. 34 shows the transistor in the driver of 256 gray scale display in Fig. 25.
- FIG. 9 is a diagram showing a relationship between an allowable limit of a deviation of a 24.1 output current value from a theoretical value and a display gradation.
- FIG. 35 is a diagram showing a circuit configuration when detecting and correcting gradation inversion in the source driver having the output stage of FIG.
- FIG. 36 is a diagram showing a gradation difference between gradation 3 and gradation 4.
- FIG. 37 is a diagram showing a gradation difference between the gradations 13 1 and 13 2.
- FIG. 9 is a diagram illustrating a configuration of an output stage in a case where either one of the shifts is selected and output, or the output is sequentially performed in time.
- FIG. 39 is a diagram showing a current output stage with a function of increasing the current of the most significant bit current source when the raising signal line is used.
- FIG. 3 is a diagram illustrating a relationship between a determination signal and a source signal line.
- FIG. 41 is a diagram showing a flowchart for determining whether to output a precharge voltage in the present invention.
- FIG. 42 is a diagram showing a precharge determination signal generator for realizing the precharge application method of the present invention.
- FIG. 43 is a diagram illustrating an example of a configuration of a source driver having a function of eliminating the grayscale inversion by changing the level of the raised signal when the grayscale inversion occurs.
- FIG. 44 is a diagram showing a display device using a current mirror type pixel configuration.
- the current value in white display (highest gradation display) can be adjusted by adjusting the value of "I”, and this "I" value can be changed by controlling the reference current 89 in the configuration of Fig. 8. This is realized by inputting control data 88 according to the application.
- FIG. 25 shows an example in which the configuration of FIG. 24 is realized by transistors.
- the transistor 252 for the upper 6 bits corresponds to the first unit transistor of the present invention as an example
- the transistor 251 for the lower 2 bits corresponds to the second unit transistor of the present invention. This corresponds as an example.
- the transistor groups 2 41 a and 24 1 b correspond to the first current source group of the present invention as an example
- the transistor groups 24 2 a, 24 2 b, 24 2 c and 24 2 d , 242 e, and 242f correspond as an example to the second current source group of the present invention.
- the weight of each bit is given to the transistor connected to the output. It is expressed by changing the number, and the weight between the lower 2 bits and the upper 4 bits is determined by the channel width of the transistor.
- the transistors 25 1 and 25 2 are designed such that the channel width of the transistor 25 2 is about four times larger. However, since the ratio of the channel width and the ratio of the output current do not increase or decrease, the ratio of the channel width of the transistor is determined between 3.3 times and 4 times based on the simulation and the measured data of the TEG transistor. By doing so, an output stage with higher gradation can be configured.
- the output current is determined by the number of current source transistors connected to each bit, and the output current is changed in such a way that the amount of current flowing through one transistor is stacked by the number of transistors.
- the gradation and output current characteristics are as shown in Fig. 26. (Note that for the sake of space, only the lower 64 gradations are shown.)
- the upper 6-bit transistor 25 2 outputs the current shown in the area of 26 2
- the lower 2 bit transistor 25 1 outputs 2 current. 6
- the current shown in the area of 1 is output. Since the current of 262 changes the current value due to the difference in the number of transistors, the variation in the step width can be reduced to 1% or less.
- the output variation between adjacent terminals by the transistor 25'2 for the upper 6 bits is the same as that of the 6-bit driver, so the variation is within 2.5%, and the output current It has been confirmed that vertical streaks due to variations do not occur.
- Figure 19 shows the relationship between the gray scale and the adjacent current variation in the configuration of the output stage in Figure 25. If the size of the transistor 2 51 for the lower two bits is simply reduced, the relationship between the gradation and the variation shown by the solid line 191 and the broken line 1992 is obtained. Have more than 5% problem.
- Figure 14 (b) shows the relationship between variation and gradation when the channel width is simply reduced to 1/4. It is unacceptable for gradations 1 to 3 because the variation exceeds 2.5%.
- the increase in chip area by this method is 1.05 times 70% of the total, the increase is about 1.04 times as a whole, so the rate of increase is small and no variation is visible. Display becomes possible.
- the relationship between the gradation and the variation is the relationship shown by the solid lines 1991 and 1993 shown in Fig. 19, and a variation of 2.5% is realized in all gradations.
- transistors of transistor group 2 4 1 and transistor group 2 4 2 Since the groups are formed in different sizes, the current output of the transistor group 241 becomes larger or smaller than the current output of the transistor group 242 due to a difference between the simulation and the measured value.
- Tone inversion may occur between tones. For example, it is between gradations 3 and 4, or between 127 and 128.
- the gradation difference may be 0.29% at the minimum. Even if the current of the transistors in the transistor group 241 becomes large, it is sufficient that the current is suppressed to 0.29% as a whole. If the current of the transistors in the transistor group 24 1 is at most 12.3%, the grayscale will not be inverted.
- the gray level difference is 0.75%, as shown in Fig. 37. It has a current output of 242f, and is different in three groups: transistor group 242a, transistor group 241a, and transistor group 241lb.
- the current of the transistor group 242a is one half of that of the transistor group 242f, and the change in the current value due to the variation of the transistors is smaller than that in the case of 128 gradations or less. In this case, there is a possibility that the difference becomes 0.08%, and as a result, even if there is a variation in the transistors, the luminance difference becomes 0.67%.
- the transistor group Since the difference in luminance is larger than that between 127 and 128, and the ratio of the current output of the transistor group 241 is smaller, the transistor group is at least as large as that between 127 and 128. There is no problem even if the current of the transistor 4 becomes large.
- Fig. 34 shows the relationship between the range in which gradation inversion does not occur even when the current amount of the transistors in the transistor group 241 exceeds the simulation value (theoretical value), and the display gradation.
- the deviation from the theoretical value is the least allowable between 127 and 128 gradations, in this case 12.3%. At least as long as the theoretical value does not deviate from the actual value by 12%, current output can be realized without grayscale inversion.
- the transistor size of the lower 2 bits (output in transistor group 241) and the upper 6 bits (output in transistor group 242) of the 8-bit driver in the configuration of Fig. 24 and Fig. 25 were changed. However, it is possible to display without gradation inversion.
- Figure 32 shows the circuit configuration of one output of the incorporated current output stage 23.
- the present embodiment is characterized in that a current increasing transistor 3 2 2 and a switching section 3 2 1 are added for 128 gray levels or more. There are three terminals 3 2 3 of the switching section 3 2 1, which are connected to the current increasing transistor 3 2 2, the ground potential, and the current source 2 4 2 f, respectively. Normally, in the switching unit 3221, 3233a and 3233b are connected, and 3233c is not connected. Therefore, the current increasing transistor 322 does not affect the current output. If there is no gradation inversion, ship in this state.
- the grayscale inversion occurs when the current of the transistor group 241 becomes large, a laser or the like is used to prevent the grayscale inversion by increasing the current of 128 grayscale or more.
- the connection of the switching unit 3 2 1 is changed by the connection, and the terminals 3 2 3 a and 3 2 3 c are connected.
- the configuration is such that only the grayscale inversion between grayscales where grayscale inversion is most likely to occur can be remedied.
- the current of 322 is about 10% of the current of the transistor group 241a.
- the connection between the current increasing transistor 3 2 2 and the current source 2 42 f is performed via the switching means 3 91, and the switching means 3 91 is controlled by the raising signal 3 92.
- the switching means 3 91 is controlled by the raising signal 3 92.
- the raising signal 612 may be set for each output, but in this case, a latch for holding the value of the raising signal 612 for each signal line is required. Distribution of signals to each latch is possible by 1-bit signal input 3922 if a shift register used to distribute video signals is shared. However, there is a problem that the circuit scale becomes large because the latch is provided for each signal line. The number of data bits to be held by the latch unit 22 is increased by one bit for each source line. If the circuit size may be large, or if the area of the latch occupying the whole is small using a fine process, it may be possible to decide whether or not to raise by controlling the raising signal for each output. However, when the grayscale inversion occurs, it occurs when the simulation value and the measured value are far apart from each other. Therefore, it is basically determined whether the current increasing transistor 3222 is necessary or not for all terminals. Should be.
- all raised signal lines 392 are shared in one source driver. As a single signal line, the control of this signal line determines whether or not to increase the current of 128 gray levels or more at all outputs.
- this signal line is normally set to a low level, and the switching section 391 is set to a non-conducting state, but all the outputs are controlled collectively by switching the raised signal line 392 to a high level by laser processing. By doing so, repairs can be implemented in a short period of time.
- This can be realized by forming a circuit 431 as shown in FIG.
- the ROM 351 can be configured inside the source dryino IC 36, the value of the ROM 351 is written by an external control signal. For an IC that does not cause grayscale inversion so that the line 392 is set to the high level, the ROM 351 may be written so that the raised signal line 392 is moved to the low level. .
- the ROM 351 may be written so that the raised signal line 392 is moved to the low level.
- the source driver has been described as being 8 bits, but the present invention can be realized without using 8 bits.
- the combination of the lower 1 bit and the upper 7 bits is also possible.
- a current driver with (N + M) ( ⁇ 3) bits output is realized. it can.
- the lower N-bit transistor outputs 1 Z 2 N of the current output of the upper M-bit transistor.
- the current output of the upper M-bit transistor is larger than that of the lower N-bit transistor. .
- N 4 is the maximum value.
- N ⁇ M In general, even for (N + M) -bit drivers, N ⁇ M must be satisfied in order to reduce the effect of deviation from the theoretical value of the lower transistor (for N bits). Even if N ⁇ M, it is preferable that N ⁇ 4 in order to improve the gradation between adjacent gradations.
- an organic light-emitting element has been described as a display element.
- the present invention can be implemented using any display element such as an organic electroluminescent element, a light-emitting diode, and the like, in which current and luminance are proportional to each other. It is possible.
- By inputting an 8-bit signal with gamma correction applied and performing display using the source driver IC 36 it is possible to achieve gamma-corrected display without using FRC.
- the display on the lower gradation side becomes smoother (the effect of the FRC due to FRC is eliminated), and a display device with high display quality can be realized.
- This is a dry IC 36 indispensable for a display device as shown in FIGS. 21 to 23.
- the transistor used in the pixel 67 is a; -type transistor has been described, but the same can be realized by using an n-type transistor.
- FIG. 20 shows a circuit for one pixel when a current mirror type pixel configuration is formed by n-type transistors.
- the direction in which the current flows is reversed, and the power supply voltage changes accordingly. Therefore, the current flowing through the source signal line 205 needs to flow from the source driver IC 36 toward the pixel 67.
- the configuration of the output stage is a current mirror configuration of a transistor that discharges current outside the dry IC.
- the direction of the reference current also needs to be reversed. In this way, the transistor used for the pixel can be applied to both p and n.
- FIG. 2 shows the configuration of the current output type source driver IC 36 in the current output type semiconductor device according to the second embodiment of the present invention.
- the number of outputs is simply the number of shift registers 21 and latches 22 required for each output, current output stage 23, precharge voltage application determination unit 56, and current output Z precharge voltage selection unit 25. This can be realized by reducing the amount of increase or decrease, so that any number of outputs can be handled. (However, when the number of outputs increases, the chip size becomes too large and the versatility is lost. Therefore, about 600 is the largest for practical use.)
- the video signal of the dryno IC 36 of the present invention is input from the control IC 28 via the signal lines 12 and 13.
- the video signal and various setting signals are distributed by the distribution unit 27, and only the video signal is input to the shift register unit 21. Distributed to each output terminal by shift register 21 and two latches 22 I do.
- the distributed video signal is input to the current output stage 23.
- the current output stage 23 outputs a current value corresponding to the gradation from the video signal and the reference current generated by the reference current generation unit 26.
- the precharge determination signal data of the latch section is input to the precharge voltage application determination section 56.
- the precharge voltage application determination section 56 determines whether the voltage supplied from the precharge power supply 24 is output to the output 53 by the precharge determination signal latched by the latch section 22 and the precharge pulse. Generates a signal to control the switch of. As a result, in accordance with the output signal of the precharge voltage application judging section 56, an electric current for selecting whether to output a current corresponding to the gray scale outside the driver IC 36 or to supply the voltage supplied from the precharge power supply 24. Current Output A current or voltage is output to the outside of the driver IC 36 via the Z precharge voltage selection unit 25.
- the voltage output from the precharge power supply 24 is a voltage value necessary for displaying black on the display panel.
- the method of applying the precharge voltage is a configuration peculiar to the driver IC 36 for performing gradation display on the active matrix type display device according to the current output.
- a predetermined current value is written to a certain pixel from a source signal line in an active matrix display device having a pixel configuration shown in FIG.
- a circuit extracted from the circuit related to the current path from the output stage of the source driver IC 36 to the pixel is as shown in Fig. 12 (a) .
- the current flowing through the drive transistor 62 and the source signal line 60 also changes.
- the voltage of the source signal line changes according to the current-voltage characteristics of the driving transistor 62. If the current-voltage characteristics of the driving transistor 62 are as shown in FIG. 12B, for example, if the current flowing through the current source 122 changes from I2 to I1, the voltage of the source signal line becomes V It will change from 2 to V1. This change in voltage is caused by the current of the current sources 122.
- the source signal line 60 has a stray capacitance 1 2 1.
- AQ charge of the stray capacitance
- I current flowing through the source signal line
- C 10 pF
- I 10 nA
- ⁇ ⁇ 50 milliseconds
- the switch transistors 66a and 66b for writing current to the pixel are closed while the source signal line current is changing. This means that the pixels shine at a luminance between white and black due to being stored in the memory.
- FIG. 12 A schematic circuit for one source signal line 60 is shown in FIG.
- the voltage supplied from the precharge power supply 24 may be such that a voltage corresponding to each gradation current can be supplied according to the characteristics of Fig. 12 (b). Since a corresponding digital-to-analog converter is required, the circuit scale becomes large. In a small panel (9 inches or less), the stray capacitance of 121 is 10 to 15 pF and the number of pixels is small, so the vertical scanning period can be relatively long.
- a 1-bit signal line for determining whether to apply the voltage source 24 is prepared.
- FIG. 9 shows the voltage application determination operation in the circuit configuration of FIG.
- the precharge determination signal 55 determines whether or not to apply a voltage.
- a voltage is applied at the "H” level, and no voltage is applied at the "L” level.
- the time when the gate voltage of the driving transistor 62 inside the pixel circuit 67 becomes the same as the output voltage of the precharge power supply 24 is a time constant expressed by the product of the wiring capacity of the source signal line 60 and the wiring resistance. Is determined by It can be changed in about 1 to 5 seconds, depending on the buffer size and the panel size of the precharge power supply 24 output.
- a current is output after a predetermined voltage is set in 1 to 5 ⁇ sec.
- switching between voltage output and current output is performed using a precharge pulse.
- the voltage of the precharge power supply 24 is output only when the precharge pulse and the precharge determination signal 5 5 are simultaneously “ ⁇ ”. In other cases, the current is output. If the voltage application is unnecessary, the current is output. Even when the output needs to be applied with voltage, the variation can be corrected by the current after the voltage is applied.
- the operation described above is performed for the switch 13 1 that controls the precharge power supply 24.However, the operation of the switch 13 2 by the current output control unit 13 3 In 2, it must be on, but may be on or off during the voltage output period.
- the presence or absence of the switch 132 depends on the design of the operational amplifier at the time of driver design. To reduce the size of the operational amplifier, provide a switch 13 2 . If an operational amplifier or a precharge power supply 24 is supplied from outside the source driver 36 and a power supply with sufficient current output capability is used, the source driver In order to reduce the circuit scale, the switch 132 and the current output control unit 133 may be omitted.
- the voltage value output from the precharge power supply 24 is only a voltage corresponding to the current at the time of black gradation (hereinafter referred to as a black voltage), for example, a plurality of gradation data 54 'If the white gradation is displayed over the horizontal scanning period, the source signal line will repeat black, white, black, and white states. If the precharge is not performed, the white state will occur continuously. In other words, by performing precharge, the change of the signal line is rather sharpened. In addition, depending on the current at the time of white display, the current may not be completely white, and the write current may be insufficient.
- precharging is not performed at a gray level where a relatively large amount of current flows, and only the gray level that is hard to change to a predetermined current near the black gray level is used by the precharge power supply 24.
- You should be able to receive For example, there is a period during which the precharge voltage is applied only when the gradation is 0 (black), and it is the best not to apply the precharge voltage during the other gradation display. Is also effective. By lowering the brightness at the lowest gradation, the contrast increases, and a more beautiful picture can be displayed.
- the precharge can be performed only when the gradation is 0. .
- shy precharge determination signal 5 5 Otaku when gradation data 5 4 0, 1, it is possible to perform precharging when the gradation 0, 1 (Fig. 1 7 (b)) c
- a precharge voltage is applied only at the beginning of one frame, a predetermined gray level flows sufficiently using only the black current.
- the time required to change to the predetermined current value only by the current differs depending on the current value applied to the source signal line in the previous horizontal scanning period, and the change takes longer as the change amount increases. For example, it takes time to perform black display after white display, but when black display is performed after black display, the time required for the change is short because the signal line changes only by the variation of the driving transistor 62.
- a signal (precharge determination signal 55) for determining whether to apply a precharge voltage is introduced for each color in synchronization with the grayscale data 54, so that an arbitrary grayscale or the same It is also possible to introduce a configuration that allows the selection of pre-charged or non-precharged even at the gray scale.
- a precharge determination signal 55 is added to the gradation data 54.
- the latch section 22 since the latch section 22 also needs to latch the precharge determination signal, the latch section 22 has a latch section of the number of video signal bits + 1 bit.
- the precharge determination signal is supplied from the control IC 28.
- the pattern of the precharge determination signal 55 can be changed and output as shown in Fig. 17 (a) to (c).
- the precharge setting can be flexibly changed from outside the source driver IC 36 according to the capacity of the source signal line and the length of one horizontal scanning period, which has the advantage of versatility. is there.
- a method for generating the precharge determination signal 55 by the control IC 22 will be described. It determines whether or not to precharge the input video signal, and outputs the result as a precharge determination signal 55 from the control IC 22 to the source driver.
- the state of the previous row is different from the judgment of whether to precharge or not, from the viewpoint that the current change amount of the source signal line and whether the current value flowing through the source signal line changes to a predetermined current value are affected. And the determination based on the display gradation of the row.
- the change amount is large when it changes from white to black, but it takes a long time, but the same gradation is displayed over multiple rows, such as from black to black.
- the amount of change in the source signal line current in the period corresponding to the row displaying the same gray scale is small because it is only for compensating the variation.
- voltage output from the precharge voltage is performed only when the gradation difference between the data of the previous row and the data is large by referring to the data of the previous row.
- Precharge is not performed when black changes to black.
- the time required for the correction of the variation from black to black can be lengthened by the absence of precharging, and the accuracy of the correction can be further improved. This indicates that it is preferable not to precharge when the gradation data of the previous row and the gradation data of the row are the same.
- the voltage for precharging is only the voltage corresponding to the black state
- the voltage is not changed to the black state and only the predetermined current is used.
- a gradation display may be performed. Therefore, it is understood that it is preferable not to perform the precharge when the gradation of the row is higher than the gradation of the previous row.
- the precharge may be performed when the pixel in the previous row is less than the halftone.
- a predetermined gradation can be displayed even when the luminance of the pixel is equal to or lower than the halftone because the change amount is small.
- precharging is not performed.
- the previous line is used according to the data of the previous line according to the data of the previous line.
- the precharge is not performed for an instruction that is larger than the data of the previous row, and the precharge is performed when the data is smaller than the data of the previous row. If the data is the same as the data of the previous row, precharge is not performed irrespective of the gradation of the row.
- the state immediately before writing the data of the first row to the pixel that is, the state of the source signal line during the vertical blanking period is important.
- the current source 103 for gradation display tries to forcibly draw current and lowers the drain voltage of the transistor constituting the current source 103.
- the potential of the source signal line also decreases at the same time.
- the potential of the source signal line drops greatly, and the source signal line potential drops as compared with the normal white display.
- the potential of the source signal line is the lowest during white display and the highest during black display.
- the source signal line has a current value corresponding to the gradation. It is more difficult to change the potential of the other rows. (The required change width is large.) If the source signal line potential drops significantly, the potential drops further compared to white display, and if it takes a long time to change even when white display is performed on the first line, display is performed with a brightness higher than the predetermined brightness. I will be. It is desirable to output a precharge voltage regardless of the display gray level for the row to be scanned immediately after the end of the vertical blanking period.
- the vertical synchronization signal is used, and the precharge determination signal corresponding to the data corresponding to the next row in the vertical blanking period is a signal for forcibly performing precharge, and the luminance of the first row is Solved the problem different from the brightness of other rows.
- black display data is input to the grayscale data 54 during the vertical blanking period, and the switch 108 is turned off so that the source signal is turned off.
- the reduction of the line potential may be suppressed.
- a switch may be provided between the current output 104 and the source signal line, and the switch may be turned off during the vertical blanking period. This switch may also be used as the current / voltage selector 385, so that the switch status can be ternary and the switch is separated from the current output, voltage output, and source signal lines. It is possible to reduce the number.
- a phenomenon in which a predetermined gradation is difficult to write affects the average luminance and the lighting rate of a displayed image.
- the lighting rate is high, the luminance is high as a whole, and even if a small number of black display pixels are in halftone display, they cannot be viewed.
- the lighting rate is low, the brightness of most pixels is set low, and when this brightness cannot be displayed normally, the brightness of almost the entire surface changes. This has a significant effect on display quality.
- precharge is not performed, and settings can be made to perform precharge in a display with a low lighting rate in which the black display luminance rises conspicuously.
- the lighting rate of the panel can be calculated by adding all luminance data for one frame. According to the lighting rate value obtained by this method, if the lighting rate is high, precharge is not performed; if the lighting rate is low, precharging is performed based on the judgment results so far. It is possible to faithfully display the luminance 'of the pixel for gradation display.
- FIG. 41 shows a flowchart for performing the precharge method described above.
- the precharge voltage is output regardless of the video signal.
- the output voltage value may be changed according to the video signal.
- the forced precharge signal is enabled only when the video signal corresponding to the first row is input, the data on the first row performs precharge regardless of the video signal, and during the vertical blanking period, It is possible to avoid a phenomenon that the current is hardly changed to a predetermined value due to a decrease in the source signal line voltage.
- the gradation of the input video signal is determined next (4 1 2).
- the precharge is not performed in the gray level in which the predetermined current can be written in ⁇ 412, and the precharge is performed in the gray level in which the current alone does not become the predetermined current.
- the process proceeds to 4 13.
- the specific gradation can be set by an external command because the specific gradation is different depending on the display panel. If the current video signal data has a higher gray scale than the data of the previous row, precharging should not be performed if blacking is performed by precharging because the change in the signal line will be rather large. Similarly, precharge is not performed even when the gradation is the same as that of the previous row.
- the lighting rate is referred to next. If the lighting rate is high, precharge is not performed regardless of the determination result. If the lighting rate is low, precharge as determined.
- FIG. 40 shows an example of a 2-bit precharge determination signal 55.
- FIG. 42 shows a circuit block for realizing the precharge method according to the present invention.
- a decision signal as to whether or not to precharge the video signal 410 as a result of the decision by each block is output to the picture signal 417.
- the determination signal 417 output at almost the same timing as the video signal 411 determines whether or not to perform precharge on the source driver side.
- the serial-to-parallel converter 4 27 is not always necessary, but it is implemented in combination with the source driver IC shown in Fig. 2 to match the input interface of the source driver 36. It is something.
- the video signal 410 is input to the precharge determination section (4 2 1) and the storage means (4 2 2).
- forced precharge performs precharge when the forced precharge signal 416 is input, regardless of the video signal 410, so all precharges are performed. What is necessary is just to insert the final result of the decision block in a form that masks the decision result. Therefore, in FIG. 42, the precharge flag generator 408 is configured at the last stage. If the precharge determination signal 4 17 is to be precharged at the "H" level, the desired operation can be realized if this block is composed only of OR.
- the storage means 4 2 2 has a capacity to hold the data of the number of outputs of the source driver 36, and holds the data of the previous line by holding the video signal for one horizontal scanning period. By comparing the output of the storage means 422 with the video signal 410, the data of the previous row and the data of the row are compared, and the comparison result is input to the next precharge determination unit. If the comparison result is precharged This is output as a single bit that indicates whether or not it is lost.
- the gradation set by the precharge applied gradation judgment signal 4 29 referring to the video signal 410 is used. Determines whether it is greater than or less than and outputs a signal as to whether to perform precharge.
- the determination is made based on the lighting rate.
- the judgment section 409 calculates the lighting rate data 420 and the lighting rate setting signal 418 from the lighting rate setting signal 418. The signal is output.
- the pre-charge flag generator 4 08 which receives the output of the previous-row data comparator, the pre-charge judging unit and the judging unit based on the lighting rate, and the forced pre-charge signal 4 16, generates the forced pre-charge signal 4 16
- the signal to be precharged is output to 417 regardless of other signals. In other cases, the output is performed so that precharge is performed only when the output of the data comparison unit, the precharge determination unit, and the lighting unit in the previous row are all precharged.
- the precharge flag 4 17 corresponding to the video signal 410 outputs an output corresponding to the result determined according to the flow of FIG.
- the serial / parallel converter 4 27 is necessary to match the input interface of the source driver 36 in Fig. 3, and the video signal of each color and the precharge output 4 17 (for each color) are transferred in parallel. Not required if (Output directly to the source driver)
- FIG. 2 shows an example in which the control IC 28 and the source driver 36 are formed by different chips, an integrated chip formed by the same chip may be used. In this case, the configurations shown in FIGS. 41 and 42 are incorporated in the source driver 36. It is preferable that the output voltage value of the precharge power supply 24 can be controlled by an electronic device or the like. This is because the precharge voltage for flowing the predetermined current is determined based on the voltage of the EL power line 64. In FIG. 12, when the current I 2 is caused to flow through the source signal line 60, the potential of the source signal line 60 becomes as follows from the relationship between the drain current and the drain-gate voltage of the transistor 62 (FIG. 12 (b)). The voltage of the EL power supply line 64) 1 V2.
- the EL power supply line 64 is supplied to each pixel via wirings 3 13 and 3 14 in the display panel shown in FIG.
- the maximum current flows through 3 13
- the minimum current flows through 3 13.
- the potentials at 315 and 316 are different at the time of white display.
- the potentials of 3 15 and 3 16 are almost equal. That is, the potential of the EL power supply line 64 differs between white display and black display due to the voltage drop of the EL power supply line 3 13.
- the voltage of the source signal line 60 differs due to the difference in the voltage drop amount of the EL power supply line 313. Therefore, unless the voltage value of the precharge power supply 24 is changed by the voltage drop amount of 3 13, there arises a problem that the current of the source signal line changes and the luminance changes as a result.
- the voltage applied to the source signal line 60 must also be different.
- the voltage may be changed using the lighting rate data in one frame.
- the lighting rate is high, the current flowing through the EL power supply line 3 13 increases, so that the electronic polymer is controlled so that the voltage drop is large and the voltage value of the precharge power supply 24 is reduced.
- the lighting rate is low, since the voltage drop of the EL power supply line 3 13 is small, the voltage value of the precharge power supply 24 is increased by the electronic volume, so that the wiring resistance of the EL power supply line 3 13 is caused. Can be eliminated.
- An N-bit precharge determination signal 55 is required for the number of power supplies (2 N -1), and decoding to control (2 N -1) switches from the N-bit signal Since this section is required for the application determination section 39 of each source signal line, there is a problem that the circuit scale of this decoding section increases with an increase in N, and the chip area increases.
- the digital analog converter 381 only prepares one in the semiconductor circuit, converts the serially transferred data to analog voltage, and then applies it to each source signal line. Try to distribute. To this end, the output 382 of the digital-to-analog converter is input to the distributor and holder 383, and an analog voltage based on the grayscale data is distributed and supplied to each source signal line.
- the gradation data 386 is distributed to each source line by the shift register and the latch section 384 as in Fig. 2, and the current in each source line is The output stage 23 outputs a current corresponding to the gradation.
- the current / voltage selecting unit 3885 is disposed immediately before the output to the source signal line. Pretty The current / voltage selection unit 385 is switched by the voltage judgment signal 380, the precharge voltage application judgment unit 56 and the precharge pulse 52, and either current is output or current is output after voltage output Decide.
- the precharge voltage application determination section 56 determines whether to provide a period for performing voltage output.
- the precharge pulse 52 determines a period for performing voltage output when performing voltage output.
- the digital-to-analog converter 381 has the number of analog output stages corresponding to the number of gray scales, it is possible to output a voltage corresponding to the gray scale, and the period during which a certain row is selected In the horizontal scanning period, the source signal line current is first changed to almost a predetermined value by the voltage, and then the deviation of the current value due to the variation of the transistor of each pixel is corrected by the current output. It becomes possible.
- the method of changing the voltage can complete the change in almost 1 ⁇ s
- the method of flowing the current after applying the voltage has an advantage that the current can be easily changed to a predetermined current within the horizontal scanning period.
- the digital-to-analog converter 381 only needs to have a resolution of 7 bits, and it is only necessary to be able to output 128 voltages.
- the precharge determination signal 380 is input so as not to perform voltage output.
- the current / voltage selector 385 always outputs only the current. Since the output signal of the digital-to-analog converter 381 is not output to the outside of the driving semiconductor circuit, any value may be used. The easiest way Alternatively, the voltage corresponding to the value of the lower 7 bits may be output, ignoring the upper 1 bit of the input gradation data 3886.
- the current / voltage selection section 385 is controlled by the precharge judgment signal 380 to provide a digital analog conversion section.
- 3 8 Provide a period to output the analog voltage from 1 to the outside of the driving semiconductor circuit.
- the voltage of the source signal line is the highest in black display and white display in the current copier using a p-type transistor as shown in Fig. 6 or the current mirror pixel configuration as in Fig. 44.
- the voltage change width in the black to halftone range is smaller than the voltage change width in the black to white range. Therefore, when the voltage is output only when the gradation is from 0 to 127, the dynamic range of the output voltage can be reduced.
- the source driver IC 36 of the present invention outputs a current after the voltage is applied, and performs an operation of correcting the variation of the driving transistor, so that the output voltage value may be set to a value that is almost the target current value. Good, no accuracy required. As a result, since the value of the output deviation of the voltage output of the digital analog converter 381 can be larger than that of the liquid crystal panel, the circuit scale can be reduced accordingly.
- the current change varies depending on the size of the panel using the source driver IC (different stray capacitance of the source line) and the difference in the number of pixels in the scanning direction (different horizontal scanning period).
- the driver IC of this configuration if the precharge pulse 52 is input from outside the source driver IC, the precharge determination signal 380 and the grayscale data 386 become external as shown in FIG. Be a signal input Therefore, there is an advantage that the gradation range for performing gradation display using only the current or both the voltage and the current can be set arbitrarily according to the panel.
- the setting of the gradation range can be controlled by a control IC externally formed as shown in FIG. If the operation of the control IC can be changed by command input, it can be adjusted by command input.
- the control IC is configured outside of the source driver IC as shown in Fig. 2, and the source dryino IC and control IC are in the same chip as seen in a part of the liquid crystal source driver. It may be formed integrally. In this case, the gradation range can be adjusted by inputting the integrated I command.
- the current cannot be changed to the predetermined value for a predetermined time (horizontal scanning period) because the current flowing through the source signal line is small, so that the next row of white display is performed.
- the ray problem was solved by inputting a precharge voltage.
- FIG. 8 is a diagram showing a reference current generation circuit.
- the reference current defines the current value per one gradation (reference current 89) in the configuration of the output stage shown in FIG.
- the reference current 89 is determined by the potential of the node 80 and the resistance value of the resistance element 81.
- the potential of the node 80 can be changed by the voltage adjusting unit 85 and by the control data 88.
- the output current varies from terminal to terminal depending on the transistor size of the gradation display current source 103 for performing current output.
- Figure 11 shows the relationship between transistor size (channel area) and output current variation. Considering the variation of the reference current, the variation between adjacent terminals within the chip and between the chips must be within 2.5%. Therefore, the variation of the output current in Fig. 11 (current at the output stage) (Variation) should be less than 2.5%
- the transistor size of 103 is more than 160 square microns.
- the power supply circuit that supplies current to the display panel must have enough capacity to allow the maximum current to flow. However, it is very unlikely that the screen display will cause the maximum current to flow. Providing a large-capacity power supply circuit is wasteful because of this maximum current, which occurs only in a few occasions. In order to reduce power consumption, the maximum current must be reduced as much as possible.
- the maximum current if 15 display pixels are 60% or more of the total, the brightness of all pixels is reduced by about 2 to 3%. According to this, the maximum current is reduced by 2-3%, and the power at the peak is reduced.
- This method can be realized by changing the value of the reference current 89 generated from the reference current generator 26 that determines the current per gradation by about 2 to 3%.
- the reference current 89 is changed by changing the value of the control data 88 and the voltage of the node 80 according to the display pattern.
- control IC 28 In order to change the value of the control data according to the display pattern, it is necessary to determine the display pattern and to control the control data based on the determination result. Therefore, this determination is normally made by the control IC 28. Therefore, the number of signal lines input from the control IC 28 to the source dryino IC 36 is equal to the number of control data lines of the electronic volume in addition to the video signal lines. Therefore, the input / output terminals of both ICs increase. If the control of the electronic volume is 6 bits and the video signal line is 18 bits (6 bits for each color), 24 terminals Required.
- the precharge power supply 24 is built in, there is a register for setting the output voltage of the precharge power supply 24. Since the precharge voltage is determined by the TFT characteristics of the display panel and the threshold voltage of the organic light emitting element, it is necessary to set a different voltage value for each different panel, and it is necessary to set at least once from the outside. Providing an external input terminal for one setting is inefficient.
- Reducing the number of input / output signal lines is effective in reducing the chip area and simplifying external wiring.
- a data line and an address line are connected between a control IC and a source driver IC, and a video signal and various setting signals (hereinafter, a signal is referred to as a command data signal and a period during which a command data signal is applied are referred to as a signal period). (Referred to as the command period) is serially transferred at high speed to reduce the number of signal lines.
- the video signal also transfers the three primary colors of red, green and blue serially.
- Figure 1 shows the timing chart of the data line and the address line. After the start pulse 16 is input, pixel data for one row is transferred from the data line 12. Thereafter, various control data is transferred. For example, the setting value of an electronic program.
- the address 13 is transferred in synchronization with the data on the data line 12.
- the data is red data, when it is 1, the data is green, and when it is 2, the data is blue data.
- Values of 4 or more are various setting signals, that is, command data.
- FIG. 18 is a block diagram of the distribution unit 27 for distributing serially transferred data.
- the distribution unit consists of two stages of registers or latch circuits for video signals and one stage for other command data signals.
- the necessary data is stored in the first register or latch circuit 18 2.
- the timing of the three-color signals is adjusted so that the carry pulse of the next shift register 21 can be lengthened.
- video data 11 as shown in FIG. 1 is extracted. This data is distributed to each output by the shift register section 21.
- FIGS. 28 to 30 show a second example of reducing the number of signal lines.
- a signal line is prepared for each color, and the data of each color is serially transferred.
- the video signal corresponding to each dot is transferred in order, and the command data signal is sent using the blanking period.
- Figure 30 shows the transfer relationship during one horizontal scan period.
- the distinction between the video signal transfer period 301 and the command data signal transfer period 302 is made by the data command flag 282.
- the first one of the data for one pixel 28 1 is assigned to this data command flag 28 2 (in this example, one of the red data is used). If it is a level, it is determined to be a command, and determination is made.
- the data command flag 282 may be located in any part of the data 281 for one pixel, but the first one can determine whether or not the input data is command data, so that processing is Cool
- one pixel of data 2 8 1 consists of 6 data transfers, and the precharge determination signal 55 is 3 bits, and the video signal is an 8 bit 11 bit signal. The transfer is performed at six times the speed through this signal line.
- Figure 28 shows the breakdown. First, a precharge determination signal 5 5 group 283 is transmitted, and a video signal group 284 is transmitted. There is no restriction on this order. In order to have the same circuit configuration for red data, green data, and blue data, it is preferable to transfer the precharge determination signal 55 and the video signal group 284 with the first bit of data left. Since video signals are transferred serially, After parallel conversion, it is input to the shift register via the all-parallel converter. The output timing of the red data after parallel conversion is shown in 286.
- the period represented by 285 may be blank data.
- the gut signal line sent by serial transmission is input to the source driver, parallel converted inside the source driver, and the signal is supplied to the gate driver.
- the signal of the gate signal line is input.
- a gate driver includes a pixel selection good driver for flowing a predetermined current to a predetermined pixel and an EL lighting gate driver for continuously flowing a current stored in the pixel. If two drivers are required, each of which requires a clock, start panel, scan direction control, and output enable terminal, a total of eight signal lines are required. By sending signal lines in the two sections, the gate driver waveform control can be performed at one pixel timing. Finer control is possible. Section is required)
- FIG. 29 shows an example of data transfer when transmitting a command data signal. Since the number of bits per command is often sufficient if it is about 6 bits, in this example all red, green and blue data are collectively regarded as a 6-bit signal, and the data command identification signal 28 The data of five times is taken as a command. Since the operation of the good driver is necessary even during the blanking period, a signal for the gate driver is input regardless of the value of the flag 282 in the section of the gate line and 285.
- a 1-bit command address shown in 292 is prepared using a source driver that accepts 10 or less commands as an example. Change the command register to be updated according to the values of 282 and 292. Since data is transferred once, a serial-to-parallel converter is not required, and the internal register input (such as the electronic volume input that determines the precharge power supply 24) can be updated directly.
- the input interface shown in Figs. 28 to 30 transmits the video signal and the precharge determination signal in a multiplexed manner and inputs the command data signal during the non-transmission period of the video signal, so that the number of commands is 1 0, when the command bit length is 6 bits, the number of input lines can be reduced from 93 to 6 signal lines.
- the number of signal lines and the transfer rate can be set arbitrarily.
- the minimum number of signal lines can be set to 1 bit color for each color, and the maximum number of signal lines can be set to 2 required for each pixel of each color.
- the number of signal lines decreases, the clock frequency increases, and it becomes difficult to route external wiring. Therefore, in practice, it is preferable that the number of signal lines be equal to or less than 100 MHZ.
- the clock in order to reduce EMI, only the clock is half the frequency, and data is taken in at both edges.
- the input signal need not be a signal of the CMOS level, but may be transmitted by differential transmission. Differential transmission generally has the effect of lowering the signal line amplitude and thus lowering the EMI.
- the description has been given as a mono-color output driver, but the present invention is also applicable to a multi-color output driver. It is sufficient to prepare the same circuit as the number of display colors. For example, in the case of three-color output of red, green, and blue, three identical circuits may be placed in the same IC and used for red, green, and blue.
- the transistor has been described as a MOS transistor.
- the present invention can be similarly applied to a MIS transistor or a bipolar transistor.
- the present invention is applicable to any material such as a crystalline silicon, a low-temperature polysilicon, a high-temperature polysilicon, an amorphous silicon, and a gallium arsenide compound.
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
- Electronic Switches (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020087001867A KR100934293B1 (ko) | 2003-05-07 | 2004-04-28 | 매트릭스형 표시 장치 |
JP2005506001A JP4649332B2 (ja) | 2003-05-07 | 2004-04-28 | 電流出力型半導体回路、および表示装置 |
US10/555,642 US7561147B2 (en) | 2003-05-07 | 2004-04-28 | Current output type of semiconductor circuit, source driver for display drive, display device, and current output method |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-129497 | 2003-05-07 | ||
JP2003129497 | 2003-05-07 | ||
JP2003-150769 | 2003-05-28 | ||
JP2003150769 | 2003-05-28 | ||
JP2003-287215 | 2003-08-05 | ||
JP2003287215 | 2003-08-05 | ||
JP2003-344787 | 2003-10-02 | ||
JP2003344787 | 2003-10-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004100119A1 true WO2004100119A1 (ja) | 2004-11-18 |
Family
ID=33437160
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/006179 WO2004100119A1 (ja) | 2003-05-07 | 2004-04-28 | 電流出力型半導体回路、表示駆動用ソースドライバ、表示装置、電流出力方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7561147B2 (ja) |
JP (1) | JP4649332B2 (ja) |
KR (3) | KR100835028B1 (ja) |
CN (1) | CN1784708A (ja) |
TW (1) | TWI270049B (ja) |
WO (1) | WO2004100119A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006133414A (ja) * | 2004-11-04 | 2006-05-25 | Toshiba Matsushita Display Technology Co Ltd | 有機発光素子を用いた表示装置の駆動方法 |
JP2006154299A (ja) * | 2004-11-29 | 2006-06-15 | Toshiba Matsushita Display Technology Co Ltd | 有機発光素子を用いた表示装置の駆動方法 |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003091979A1 (fr) | 2002-04-26 | 2003-11-06 | Toshiba Matsushita Display Technology Co., Ltd. | Procede de commande d'un dispositif d'affichage el |
CN1666242A (zh) * | 2002-04-26 | 2005-09-07 | 东芝松下显示技术有限公司 | 用于场致发光显示屏的驱动电路 |
CN100536347C (zh) * | 2002-04-26 | 2009-09-02 | 东芝松下显示技术有限公司 | 电流驱动型显示装置的驱动用半导体电路组及显示装置 |
WO2004100118A1 (ja) * | 2003-05-07 | 2004-11-18 | Toshiba Matsushita Display Technology Co., Ltd. | El表示装置およびその駆動方法 |
US7561147B2 (en) | 2003-05-07 | 2009-07-14 | Toshiba Matsushita Display Technology Co., Ltd. | Current output type of semiconductor circuit, source driver for display drive, display device, and current output method |
KR100611914B1 (ko) * | 2004-12-24 | 2006-08-11 | 삼성에스디아이 주식회사 | 데이터 집적회로 및 이를 이용한 발광 표시장치와 그의구동방법 |
US7907137B2 (en) * | 2005-03-31 | 2011-03-15 | Casio Computer Co., Ltd. | Display drive apparatus, display apparatus and drive control method thereof |
US20070126667A1 (en) * | 2005-12-01 | 2007-06-07 | Toshiba Matsushita Display Technology Co., Ltd. | El display apparatus and method for driving el display apparatus |
KR100777730B1 (ko) * | 2005-12-31 | 2007-11-19 | 삼성에스디아이 주식회사 | 플라즈마 디스플레이 패널 |
KR100965022B1 (ko) * | 2006-02-20 | 2010-06-21 | 도시바 모바일 디스플레이 가부시키가이샤 | El 표시 장치 및 el 표시 장치의 구동 방법 |
KR100967142B1 (ko) * | 2006-08-01 | 2010-07-06 | 가시오게산키 가부시키가이샤 | 표시구동장치 및 표시장치 |
US7474243B1 (en) * | 2007-09-13 | 2009-01-06 | Infineon Technologies Ag | Semiconductor device including switch that conducts based on latched bit and next bit |
JP2009276744A (ja) * | 2008-02-13 | 2009-11-26 | Toshiba Mobile Display Co Ltd | El表示装置 |
US8179153B2 (en) * | 2008-07-17 | 2012-05-15 | Spansion Llc | Probe apparatus, a process of forming a probe head, and a process of forming an electronic device |
KR101022106B1 (ko) * | 2008-08-06 | 2011-03-17 | 삼성모바일디스플레이주식회사 | 유기전계발광표시장치 |
JP5083245B2 (ja) * | 2008-09-30 | 2012-11-28 | カシオ計算機株式会社 | 画素駆動装置、発光装置、表示装置及び画素駆動装置の接続ユニット接続方法 |
TW201040908A (en) * | 2009-05-07 | 2010-11-16 | Sitronix Technology Corp | Source driver system having an integrated data bus for displays |
TW201044347A (en) * | 2009-06-08 | 2010-12-16 | Sitronix Technology Corp | Integrated and simplified source driver system for displays |
KR101630331B1 (ko) * | 2009-12-22 | 2016-06-15 | 엘지디스플레이 주식회사 | 액정 표시장치의 구동장치와 그 구동방법 |
CN102467871B (zh) * | 2010-11-09 | 2015-04-22 | 康佳集团股份有限公司 | Led动态显示系统及方法 |
KR101969952B1 (ko) * | 2012-06-05 | 2019-04-18 | 삼성디스플레이 주식회사 | 표시 장치 |
JP6147712B2 (ja) * | 2014-09-22 | 2017-06-14 | 双葉電子工業株式会社 | 表示駆動装置、表示装置、表示データ補正方法 |
JP2016136669A (ja) * | 2015-01-23 | 2016-07-28 | 株式会社デンソー | 電流ドライバ回路 |
US10102792B2 (en) * | 2016-03-30 | 2018-10-16 | Novatek Microelectronics Corp. | Driving circuit of display panel and display apparatus using the same |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5854728A (ja) * | 1981-09-10 | 1983-03-31 | アイテイ−テイ・インダストリ−ズ・インコ−ポレ−テツド | バイポ−ラトランジスタによるモノリシツク集積d/aコンバ−タ |
JPH06314977A (ja) * | 1993-04-28 | 1994-11-08 | Nec Ic Microcomput Syst Ltd | 電流出力型デジタル/アナログ変換回路 |
JPH09223967A (ja) * | 1996-02-14 | 1997-08-26 | Nec Corp | D/a変換回路 |
WO2003027998A1 (fr) * | 2001-09-25 | 2003-04-03 | Matsushita Electric Industrial Co., Ltd. | Ecran electroluminescent et dispositif d'affichage electroluminescent comprenant celui-ci |
JP2003114645A (ja) * | 2001-08-02 | 2003-04-18 | Seiko Epson Corp | 単位回路の制御に使用されるデータ線の駆動 |
Family Cites Families (81)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR850007703A (ko) * | 1984-04-02 | 1985-12-07 | 빈센트 죠셉 로너 | 집적 데이타 변환회로 |
JPS63290413A (ja) | 1987-05-22 | 1988-11-28 | Matsushita Electric Ind Co Ltd | ディジタル信号処理回路 |
JPH01193797A (ja) | 1988-01-28 | 1989-08-03 | Deikushii Kk | 自発光型表示装置 |
JP2805198B2 (ja) * | 1988-07-11 | 1998-09-30 | 日本テキサス・インスツルメンツ株式会社 | 電源回路及びその電源回路用の半導体集積回路装置 |
US4910480A (en) * | 1989-07-25 | 1990-03-20 | Tektronix, Inc. | Hierarchical current amplifier |
JPH03118168A (ja) | 1989-09-20 | 1991-05-20 | Hewlett Packard Co <Hp> | Ledプリントヘッド駆動回路 |
JP3039791B2 (ja) | 1990-06-08 | 2000-05-08 | 富士通株式会社 | Daコンバータ |
US5684365A (en) | 1994-12-14 | 1997-11-04 | Eastman Kodak Company | TFT-el display panel using organic electroluminescent media |
JP3424387B2 (ja) | 1995-04-11 | 2003-07-07 | ソニー株式会社 | アクティブマトリクス表示装置 |
JPH08340243A (ja) | 1995-06-14 | 1996-12-24 | Canon Inc | バイアス回路 |
JPH1011032A (ja) | 1996-06-21 | 1998-01-16 | Seiko Epson Corp | 信号線プリチャージ方法,信号線プリチャージ回路,液晶パネル用基板および液晶表示装置 |
KR100462917B1 (ko) * | 1996-02-09 | 2005-06-28 | 세이코 엡슨 가부시키가이샤 | D/a변환기,d/a변환기의설계방법,액정패널용기판및액정표시장치 |
JPH09319323A (ja) | 1996-05-28 | 1997-12-12 | Toshiba Microelectron Corp | 定電流駆動回路 |
US6219113B1 (en) * | 1996-12-17 | 2001-04-17 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for driving an active matrix display panel |
US5990629A (en) * | 1997-01-28 | 1999-11-23 | Casio Computer Co., Ltd. | Electroluminescent display device and a driving method thereof |
JPH10232649A (ja) | 1997-02-21 | 1998-09-02 | Casio Comput Co Ltd | 電界発光表示装置およびその駆動方法 |
US5952789A (en) * | 1997-04-14 | 1999-09-14 | Sarnoff Corporation | Active matrix organic light emitting diode (amoled) display pixel structure and data load/illuminate circuit therefor |
US6229506B1 (en) * | 1997-04-23 | 2001-05-08 | Sarnoff Corporation | Active matrix light emitting diode pixel structure and concomitant method |
JPH113048A (ja) | 1997-06-10 | 1999-01-06 | Canon Inc | エレクトロ・ルミネセンス素子及び装置、並びにその製造法 |
US6175345B1 (en) | 1997-06-02 | 2001-01-16 | Canon Kabushiki Kaisha | Electroluminescence device, electroluminescence apparatus, and production methods thereof |
KR19990027857A (ko) * | 1997-09-30 | 1999-04-15 | 윤종용 | 분리 전류원을 이용한 전류 출력형 디지탈/아날로그 변환기 |
JP3765918B2 (ja) | 1997-11-10 | 2006-04-12 | パイオニア株式会社 | 発光ディスプレイ及びその駆動方法 |
JP3755277B2 (ja) | 1998-01-09 | 2006-03-15 | セイコーエプソン株式会社 | 電気光学装置の駆動回路、電気光学装置、及び電子機器 |
US6531996B1 (en) * | 1998-01-09 | 2003-03-11 | Seiko Epson Corporation | Electro-optical apparatus and electronic apparatus |
JPH11265162A (ja) | 1998-01-09 | 1999-09-28 | Seiko Epson Corp | 電気光学装置及び電子機器 |
JP3252897B2 (ja) * | 1998-03-31 | 2002-02-04 | 日本電気株式会社 | 素子駆動装置および方法、画像表示装置 |
JPH11282420A (ja) | 1998-03-31 | 1999-10-15 | Sanyo Electric Co Ltd | エレクトロルミネッセンス表示装置 |
JP4081852B2 (ja) | 1998-04-30 | 2008-04-30 | ソニー株式会社 | 有機el素子のマトリクス駆動方法及び有機el素子のマトリクス駆動装置 |
GB9812739D0 (en) * | 1998-06-12 | 1998-08-12 | Koninkl Philips Electronics Nv | Active matrix electroluminescent display devices |
GB9812742D0 (en) * | 1998-06-12 | 1998-08-12 | Philips Electronics Nv | Active matrix electroluminescent display devices |
JP2000105574A (ja) | 1998-09-29 | 2000-04-11 | Matsushita Electric Ind Co Ltd | 電流制御型発光装置 |
JP4138102B2 (ja) | 1998-10-13 | 2008-08-20 | セイコーエプソン株式会社 | 表示装置及び電子機器 |
US6072415A (en) * | 1998-10-29 | 2000-06-06 | Neomagic Corp. | Multi-mode 8/9-bit DAC with variable input-precision and output range for VGA and NTSC outputs |
JP3686769B2 (ja) * | 1999-01-29 | 2005-08-24 | 日本電気株式会社 | 有機el素子駆動装置と駆動方法 |
JP3500322B2 (ja) * | 1999-04-09 | 2004-02-23 | シャープ株式会社 | 定電流駆動装置および定電流駆動半導体集積回路 |
JP3259774B2 (ja) * | 1999-06-09 | 2002-02-25 | 日本電気株式会社 | 画像表示方法および装置 |
JP4092857B2 (ja) | 1999-06-17 | 2008-05-28 | ソニー株式会社 | 画像表示装置 |
WO2001006484A1 (fr) | 1999-07-14 | 2001-01-25 | Sony Corporation | Circuit d'attaque et affichage le comprenant, circuit de pixels et procede d'attaque |
JP2001042822A (ja) | 1999-08-03 | 2001-02-16 | Pioneer Electronic Corp | アクティブマトリクス型表示装置 |
JP2001042827A (ja) | 1999-08-03 | 2001-02-16 | Pioneer Electronic Corp | ディスプレイ装置及びディスプレイパネルの駆動回路 |
JP3863325B2 (ja) | 1999-09-10 | 2006-12-27 | 株式会社日立製作所 | 画像表示装置 |
WO2001020591A1 (en) * | 1999-09-11 | 2001-03-22 | Koninklijke Philips Electronics N.V. | Active matrix electroluminescent display device |
TW535454B (en) | 1999-10-21 | 2003-06-01 | Semiconductor Energy Lab | Electro-optical device |
JP2001147659A (ja) | 1999-11-18 | 2001-05-29 | Sony Corp | 表示装置 |
US6384817B1 (en) * | 1999-12-21 | 2002-05-07 | Philips Electronics North America Corporation | Apparatus for applying voltages to individual columns of pixels in a color electro-optic display device |
US7301520B2 (en) * | 2000-02-22 | 2007-11-27 | Semiconductor Energy Laboratory Co., Ltd. | Image display device and driver circuit therefor |
GB0008019D0 (en) * | 2000-03-31 | 2000-05-17 | Koninkl Philips Electronics Nv | Display device having current-addressed pixels |
TW521256B (en) * | 2000-05-18 | 2003-02-21 | Semiconductor Energy Lab | Electronic device and method of driving the same |
US6528951B2 (en) * | 2000-06-13 | 2003-03-04 | Semiconductor Energy Laboratory Co., Ltd. | Display device |
CN100511370C (zh) * | 2000-07-07 | 2009-07-08 | 精工爱普生株式会社 | 用于有机场致发光显示器的电流抽样电路 |
JP3813463B2 (ja) * | 2000-07-24 | 2006-08-23 | シャープ株式会社 | 液晶表示装置の駆動回路及びそれを用いた液晶表示装置並びにその液晶表示装置を用いた電子機器 |
JP3485175B2 (ja) * | 2000-08-10 | 2004-01-13 | 日本電気株式会社 | エレクトロルミネセンスディスプレイ |
JP3700558B2 (ja) * | 2000-08-10 | 2005-09-28 | 日本電気株式会社 | 駆動回路 |
JP3514719B2 (ja) * | 2000-09-14 | 2004-03-31 | シャープ株式会社 | D/a変換回路およびそれを用いた画像表示装置 |
US6864863B2 (en) * | 2000-10-12 | 2005-03-08 | Seiko Epson Corporation | Driving circuit including organic electroluminescent element, electronic equipment, and electro-optical device |
US7173612B2 (en) * | 2000-12-08 | 2007-02-06 | Matsushita Electric Industrial Co., Ltd. | EL display device providing means for delivery of blanking signals to pixel elements |
KR100370286B1 (ko) * | 2000-12-29 | 2003-01-29 | 삼성에스디아이 주식회사 | 전압구동 유기발광소자의 픽셀회로 |
JP2002215095A (ja) * | 2001-01-22 | 2002-07-31 | Pioneer Electronic Corp | 発光ディスプレイの画素駆動回路 |
JP3904394B2 (ja) * | 2001-01-24 | 2007-04-11 | セイコーエプソン株式会社 | 画像処理回路、画像処理方法、電気光学装置、および電子機器 |
TW522754B (en) | 2001-03-26 | 2003-03-01 | Rohm Co Ltd | Organic EL drive circuit and organic EL display device using the same |
KR20020092000A (ko) * | 2001-06-01 | 2002-12-11 | 한건희 | 범용 4사분면 아날로그-디지털 곱셈기 |
JP4383852B2 (ja) * | 2001-06-22 | 2009-12-16 | 統寶光電股▲ふん▼有限公司 | Oled画素回路の駆動方法 |
KR100707304B1 (ko) * | 2001-06-29 | 2007-04-12 | 삼성전자주식회사 | 전류 출력형 디지털/아날로그 변환기 |
JP5191075B2 (ja) * | 2001-08-30 | 2013-04-24 | ラピスセミコンダクタ株式会社 | 表示装置、表示装置の駆動方法、及び表示装置の駆動回路 |
EP1434193A4 (en) * | 2001-09-07 | 2009-03-25 | Panasonic Corp | EL DISPLAY, EL DISPLAY CONTROL UNIT AND PICTURE DISPLAY |
JP4452075B2 (ja) * | 2001-09-07 | 2010-04-21 | パナソニック株式会社 | El表示パネル、その駆動方法およびel表示装置 |
JP4871462B2 (ja) * | 2001-09-19 | 2012-02-08 | エルピーダメモリ株式会社 | 補間回路とdll回路及び半導体集積回路 |
JP5589250B2 (ja) | 2001-09-25 | 2014-09-17 | パナソニック株式会社 | アクティブマトリクス型表示装置 |
US6777885B2 (en) * | 2001-10-12 | 2004-08-17 | Semiconductor Energy Laboratory Co., Ltd. | Drive circuit, display device using the drive circuit and electronic apparatus using the display device |
TW583622B (en) * | 2002-02-14 | 2004-04-11 | Rohm Co Ltd | Organic EL drive circuit and organic EL display device using the same |
JP3742357B2 (ja) * | 2002-03-27 | 2006-02-01 | ローム株式会社 | 有機el駆動回路およびこれを用いる有機el表示装置 |
JP4102088B2 (ja) * | 2002-03-27 | 2008-06-18 | 松下電器産業株式会社 | 階調制御用出力回路 |
CN1666242A (zh) * | 2002-04-26 | 2005-09-07 | 东芝松下显示技术有限公司 | 用于场致发光显示屏的驱动电路 |
CN100536347C (zh) * | 2002-04-26 | 2009-09-02 | 东芝松下显示技术有限公司 | 电流驱动型显示装置的驱动用半导体电路组及显示装置 |
WO2003091979A1 (fr) * | 2002-04-26 | 2003-11-06 | Toshiba Matsushita Display Technology Co., Ltd. | Procede de commande d'un dispositif d'affichage el |
JP3810364B2 (ja) * | 2002-12-19 | 2006-08-16 | 松下電器産業株式会社 | 表示装置用ドライバ |
WO2004100118A1 (ja) * | 2003-05-07 | 2004-11-18 | Toshiba Matsushita Display Technology Co., Ltd. | El表示装置およびその駆動方法 |
US7561147B2 (en) | 2003-05-07 | 2009-07-14 | Toshiba Matsushita Display Technology Co., Ltd. | Current output type of semiconductor circuit, source driver for display drive, display device, and current output method |
TWM250446U (en) * | 2004-02-02 | 2004-11-11 | High Tech Comp Corp | Cradle of hand-held electronic device with heat dissipation effect |
US20070126667A1 (en) * | 2005-12-01 | 2007-06-07 | Toshiba Matsushita Display Technology Co., Ltd. | El display apparatus and method for driving el display apparatus |
KR100965022B1 (ko) * | 2006-02-20 | 2010-06-21 | 도시바 모바일 디스플레이 가부시키가이샤 | El 표시 장치 및 el 표시 장치의 구동 방법 |
-
2004
- 2004-04-28 US US10/555,642 patent/US7561147B2/en active Active
- 2004-04-28 KR KR1020077020610A patent/KR100835028B1/ko active IP Right Grant
- 2004-04-28 WO PCT/JP2004/006179 patent/WO2004100119A1/ja active Application Filing
- 2004-04-28 JP JP2005506001A patent/JP4649332B2/ja not_active Expired - Fee Related
- 2004-04-28 KR KR1020057021035A patent/KR100812846B1/ko not_active IP Right Cessation
- 2004-04-28 KR KR1020087001867A patent/KR100934293B1/ko active IP Right Grant
- 2004-04-28 CN CNA2004800120135A patent/CN1784708A/zh active Pending
- 2004-05-06 TW TW093112782A patent/TWI270049B/zh active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5854728A (ja) * | 1981-09-10 | 1983-03-31 | アイテイ−テイ・インダストリ−ズ・インコ−ポレ−テツド | バイポ−ラトランジスタによるモノリシツク集積d/aコンバ−タ |
JPH06314977A (ja) * | 1993-04-28 | 1994-11-08 | Nec Ic Microcomput Syst Ltd | 電流出力型デジタル/アナログ変換回路 |
JPH09223967A (ja) * | 1996-02-14 | 1997-08-26 | Nec Corp | D/a変換回路 |
JP2003114645A (ja) * | 2001-08-02 | 2003-04-18 | Seiko Epson Corp | 単位回路の制御に使用されるデータ線の駆動 |
WO2003027998A1 (fr) * | 2001-09-25 | 2003-04-03 | Matsushita Electric Industrial Co., Ltd. | Ecran electroluminescent et dispositif d'affichage electroluminescent comprenant celui-ci |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006133414A (ja) * | 2004-11-04 | 2006-05-25 | Toshiba Matsushita Display Technology Co Ltd | 有機発光素子を用いた表示装置の駆動方法 |
JP2006154299A (ja) * | 2004-11-29 | 2006-06-15 | Toshiba Matsushita Display Technology Co Ltd | 有機発光素子を用いた表示装置の駆動方法 |
Also Published As
Publication number | Publication date |
---|---|
TW200425050A (en) | 2004-11-16 |
JP4649332B2 (ja) | 2011-03-09 |
KR100812846B1 (ko) | 2008-03-11 |
KR20060018834A (ko) | 2006-03-02 |
KR100835028B1 (ko) | 2008-06-03 |
CN1784708A (zh) | 2006-06-07 |
KR100934293B1 (ko) | 2009-12-29 |
TWI270049B (en) | 2007-01-01 |
KR20070099058A (ko) | 2007-10-08 |
JPWO2004100119A1 (ja) | 2006-07-13 |
KR20080019722A (ko) | 2008-03-04 |
US20060279260A1 (en) | 2006-12-14 |
US7561147B2 (en) | 2009-07-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4649332B2 (ja) | 電流出力型半導体回路、および表示装置 | |
KR100913452B1 (ko) | 자기 발광형 표시 장치 | |
US8018449B2 (en) | Light emitting display capable of controlling brightness | |
US7999768B2 (en) | Organic light emitting diode display and driving method thereof | |
KR100535286B1 (ko) | 표시 장치 및 그 구동 방법 | |
US7626565B2 (en) | Display device using self-luminous elements and driving method of same | |
JP2004163673A (ja) | 表示装置 | |
JP2005017979A (ja) | 電流生成供給回路及びその制御方法並びに該電流生成供給回路を備えた表示装置 | |
KR100568593B1 (ko) | 평판 표시장치 및 그의 구동방법 | |
US7250929B2 (en) | Active matrix display device and digital-to-analog converter | |
JP2005338494A (ja) | 有機発光素子を用いたアクティブマトリクス型表示装置及びその駆動方法、半導体回路 | |
JP2007263989A (ja) | 自発光素子を用いた表示装置、及びその駆動方法 | |
JP2006047580A (ja) | 有機発光素子を用いたアクティブマトリクス型表示装置及びその駆動方法、半導体回路 | |
JP2008180816A (ja) | 有機発光素子を用いた表示装置、および有機発光素子を用いた表示装置の駆動方法 | |
JP2005121843A (ja) | 電流出力型半導体回路 | |
JP2005181461A (ja) | 電流出力型半導体回路 | |
KR20070101545A (ko) | 표시 장치 | |
JP2006047418A (ja) | 有機発光素子を用いたアクティブマトリクス型表示装置の駆動方法 | |
JP2005037844A (ja) | 表示装置の駆動方法および表示装置の駆動回路 | |
JP2005148418A (ja) | 電流出力型半導体回路 | |
JP2006047693A (ja) | 有機発光素子を用いた表示装置 | |
JP2006133414A (ja) | 有機発光素子を用いた表示装置の駆動方法 | |
JP2006178364A (ja) | 有機発光素子を用いた表示装置の駆動方法 | |
JP2007025397A (ja) | 有機発光素子を用いた表示装置の駆動方法 | |
JP2006047691A (ja) | 電流出力型半導体回路及びその駆動方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2005506001 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 20048120135 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2006279260 Country of ref document: US Ref document number: 1020057021035 Country of ref document: KR Ref document number: 10555642 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 1020057021035 Country of ref document: KR |
|
122 | Ep: pct application non-entry in european phase | ||
WWP | Wipo information: published in national office |
Ref document number: 10555642 Country of ref document: US |