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US 2004/0201556 A1Published application
Display apparatus, source driver and display panel
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTetsurou Oomori, Yoshito Date
Life of this patent
Estimating the term…
Abstract
An organic EL display apparatus includes: a display panel on which a plurality of pixel sections are provided; source drivers provided with pixel drivers, which includes current drivers for supplying drive currents to the pixel sections, registers for latching data signals and timing control units; signal lines for supplying the drive currents from the current drivers to the pixel sections. Each of the current drivers is controlled by the associated timing control unit to allow a current larger than or equal to a current which is set in accordance with the data signal to flow only during a given period in a current setting mode, so that the value of a current flowing in the pixel section reaches a target value in a short time.
Claims42
A display apparatus, comprising:
- a display panel provided with a pixel section including a light-emitting device driven by a current and with a signal line connected to the pixel section;
- and
- a source driver for supplying a drive current to the pixel section via the signal line,
- wherein the source driver includes:
- a register for latching display data having N bits and for outputting the display data;
- a timing control unit for outputting a control signal;
- and
- a current driver for allowing the drive current which has been set at an arbitrary value to flow during a given period in a current setting mode, while allowing the drive current which has been set with the display data output from the register to flow during the operation periods other than the given period, in accordance with the control signal.
5 more elements
A display apparatus, comprising:
- a display panel provided with a pixel section including a light-emitting device driven by a current and with a signal line connected to the pixel section;
- and
- a source driver for supplying a drive current to the pixel section via the signal line,
- wherein the signal line is divided into a drive-voltage signal line for setting the drive current supplied to the pixel section and a drive-current signal line for transmitting the drive current supplied to the pixel section, and
- the source driver includes a voltage driver for supplying a drive voltage to the pixel section via the drive-voltage signal line and current supplying means for allowing the drive current to flow into the pixel section via the drive-current signal line.
2 more elements
A display apparatus, comprising:
- a display panel provided with a pixel section including a light-emitting device driven by a current and with a signal line connected to the pixel section;
- and
- a source driver for supplying a drive current to the pixel section via the signal line,
- wherein the pixel section further includes:
- a MISFET whose gate electrode is temporarily connected to a drive-voltage signal line, whose drain is temporarily connected to a drive-current signal line and which functions as a current source for supplying a current to the light-emitting device;
- a pixel input capacitance temporarily connected to the drive-voltage signal line and connected to the gate electrode of the MISFET;
- a voltage switch provided on a connection path for connecting the drive-voltage signal line and a connection point between the pixel input capacitance and the gate electrode of the MISFET to each other;
- a switch interposed between the MISFET and the light-emitting device and temporarily connected to the drive-current signal line;
- and
- a current switch provided between the drive-current signal line and a connection point at which the switch and the MISFET are connected to each other,
- wherein the voltage switch and the current switch are turned ON during a current setting mode, while being turned OFF during a display mode, and
- the switch is turned OFF during the current setting mode, while being turned ON during the display mode.
9 more elements
A display apparatus, comprising:
- a display panel provided with a pixel section including a light-emitting device driven by a current and with a signal line connected to the pixel section;
- and
- a source driver for supplying a drive current to the pixel section via the signal line,
- wherein the source driver includes:
- a register for latching display data having N bits and for outputting the display data;
- a current driver for outputting the drive current according to the display data input from the register;
- voltage supplying means having an output impedance lower than that of the current driver;
- a line for connecting the signal line and the voltage supplying means to each other;
- a timing control unit for outputting a control signal;
- and
- a short-circuit switch provided on the line and used for electrically connecting the signal line and the voltage supplying means to each other only during a given period in a current setting mode in accordance with the control signal.
8 more elements
A display apparatus, comprising:
- a display panel provided with a pixel section including a light-emitting device driven by a current and with a signal line connected to the pixel section;
- and
- a source driver for supplying a drive current to the pixel section via the signal line,
- wherein the source driver includes:
- a register for latching display data having N bits and for outputting the display data;
- bit-data adding means for adding M bits to the display data input from the register and for outputting a display data having (N+M) bits during a given period in a current setting mode;
- a timing control unit for outputting a control signal;
- and
- a current driver for allowing the drive current which is set with the display data having (N+M) bits to flow during the given period in the current setting mode, while allowing the drive current which is set with the display data having N bits during the operation periods other than the given period, in accordance with the control signal.
6 more elements
A display apparatus, comprising:
- a display panel provided with a pixel section including a light-emitting device driven by a current and with a signal line connected to the pixel section;
- and
- a source driver including a register for latching display data having N bits and for outputting the display data, a current driver for outputting a drive current according to the bits of the display data to the signal line and a reference current generator for supplying a reference current to the current driver,
- wherein the current driver includes N current sources constituted by MISFETs forming current mirrors with each other,
- the reference current generator includes:
- a first MISFET whose source receives a power-supply voltage and which allows the reference current to flow;
- and a variable resistance which is connected to a drain of the first MISFET and whose resistance value changes depending on the display data when the display data is input thereto;
- a second MISFET forming a current mirror together with the first MISFET;
- and a third MISFET connected to the second MISFET and used for supplying the reference current to each of the N current sources via a current mirror, and
- the display data output from the register is input to the variable resistance during a given period in a current setting mode.
7 more elements
A source driver, comprising:
- a register for latching display data having N bits and for outputting the display data;
- a timing control unit for outputting a control signal;
- and
- a current driver for allowing the drive current which has a value larger than or equal to a current value set with the display data to flow during a given period in a current setting mode, while allowing the drive current which is set with the display data output from the register during the operation periods other than the given period, in accordance with the control signal.
1 more element
A source driver, comprising:
- a voltage driver for supplying a voltage;
- a register for latching and outputting display data;
- current supplying means for receiving the display data output from the register and for allowing a current according to the display data to flow.
A source driver, comprising:
- a register for latching display data having N bits and for outputting the display data;
- a current driver having an output terminal for outputting the drive current according to the display data input from the register;
- voltage supplying means having an output impedance lower than that of the current driver;
- a line for connecting the output terminal of the current driver and the voltage supplying means;
- a timing control unit for outputting a control signal;
- and
- a short-circuit switch provided on the line and used for electrically connecting the line and the voltage supplying means to each other only during a given period in a current setting mode in accordance with the control signal.
4 more elements
A source driver comprising:
- a register for latching display data having N bits and for outputting the display data;
- bit-data adding means for adding M bits to the display data input from the register and for outputting a display data having (N+M) bits during a given period in a current setting mode;
- a timing control unit for outputting a control signal;
- and
- a current driver for allowing a current which is set with the display data having (N+M) bits to flow during the given period in the current setting mode, while allowing a current which is set with the display data having N bits during the operation periods other than the given period, in accordance with the control signal.
2 more elements
A source driver comprising:
- a register for latching display data having N bits and for outputting the display data;
- a current driver for outputting a drive current according to the bits of the display data to a signal line;
- and
- a reference current generator for supplying a reference current to the current driver,
- wherein the current driver includes N current sources constituted by MISFETs forming current mirrors with each other,
- the reference current generator includes:
- a first MISFET whose source receives a power-supply voltage and which allows the reference current to flow;
- and a variable resistance which is connected to a drain of the first MISFET and whose resistance value changes depending on the display data when the display data is input thereto;
- a second MISFET forming a current mirror together with the first MISFET;
- and a third MISFET connected to the second MISFET and used for supplying the reference current to each of the N current sources via a current mirror, and
- the display data output from the register is input to the variable resistance during a given period in a current setting mode.
8 more elements
A display panel comprising:
- a pixel section including a light-emitting device driven by a current;
- a signal line connected to the pixel section;
- a dummy pixel section which is not used for a display;
- and
- a dummy signal line connected to the dummy pixel section.
2 more elements
A display panel comprising:
- a pixel section including a light-emitting device driven by a current, the pixel section being driven by a voltage and a current;
- drive-voltage signal line for supplying a drive voltage to the pixel section;
- and
- drive-current signal line for outputting a drive current in the pixel section.
1 more element
Dependencies are inferred from the claim text.