JP2002304156A5

JP2002304156A5 -

Info

Publication number: JP2002304156A5
Application number: JP2002009261A
Authority: JP
Filing date: 2002-01-17
Publication date: 2005-09-02

Claims

A pixel portion provided with a light emitting element having first and second electrodes;
First means for measuring a current flowing between the first electrode and the second electrode of the light emitting element ;
The current value measured by the first means is compared with a reference current value so that the current flowing between the first electrode and the second electrode of the light emitting element approaches the reference current value. And a second means for correcting a voltage between the first electrode and the second electrode of the light emitting element .

In claim 1,
The light-emitting device, wherein a specific image is displayed on the pixel portion when measuring a current flowing between the first electrode and the second electrode of the light-emitting element.

A light emitting device having first and second electrodes;
A pixel portion provided with a plurality of pixels each having the light emitting element;
A first means for measuring a total current flowing between the first electrode and the second electrode of all the light emitting elements provided in the pixel portion ;
A current value measured by the first means, compares the current value as a reference, the current sum of the current flowing between the first electrode and the second electrode of the light-emitting element of the whole hand is the reference as approaches the value, the light emitting device and having a second means for correcting the voltage between the first electrode and the second electrode of the light emitting element before Symbol whole hand.

A light emitting device having first and second electrodes;
A pixel portion provided with a plurality of pixels each having the light emitting element;
A first means for measuring a total current flowing between the first electrode and the second electrode of all the light emitting elements provided in the pixel portion;
The current value measured by the first means and the reference current value are compared, and the total current flowing between the first electrode and the second electrode of all the light emitting elements is the reference current value. The second means for correcting the voltage between the first electrode and the second electrode of all the light emitting elements so as to approach
The light emitting device is driven by a constant voltage.

A light emitting device having first and second electrodes;
A pixel portion provided with a plurality of pixels each having the light emitting element and the TFT ;
A first means for measuring a total current flowing between the first electrode and the second electrode of all the light emitting elements provided in the pixel portion ;
The current value measured by the first means and the reference current value are compared , and the total current flowing between the first electrode and the second electrode of all the light emitting elements is the reference current value. as approaches, have a second means for correcting the voltage between the first electrode and the second electrode of the all of the light emitting elements,
The TFT is a TFT that controls light emission and non-light emission of the light emitting element .

A light emitting device having first and second electrodes;
A pixel portion provided with a plurality of pixels each having the light emitting element and the TFT;
A power supply line provided in the pixel portion,
One of the source region and drain region of the TFT is a light emitting device electrically connected to the first electrode of the light emitting element, and the other of the source region or drain region is electrically connected to the power supply line. There,
Current flowing between the first electrode and the second electrode of all the light-emitting elements provided in the pixel portion; A first means for measuring the sum;
The current value measured by the first means is compared with a reference current value, and the total current flowing between the first electrode and the second electrode of all the light emitting elements is the reference current value. The second means for correcting the voltage between the first electrode and the second electrode of all the light emitting elements by controlling the potentials of the second electrodes of all the light emitting elements so as to approach A light emitting device comprising:

A light emitting device having first and second electrodes;
A pixel portion provided with a plurality of pixels each having the light emitting element and the TFT;
A power line provided in the pixel portion,
One of the source region and drain region of the TFT is a light emitting device electrically connected to the first electrode of the light emitting element, and the other of the source region or drain region is electrically connected to the power supply line. There,
A first means for measuring a total current flowing between the first electrode and the second electrode of all the light emitting elements provided in the pixel portion;
The current value measured by the first means is compared with a reference current value, and the total current flowing between the first electrode and the second electrode of all the light emitting elements is the reference current value. The voltage between the first electrode and the second electrode of all the light emitting elements is corrected by controlling the potentials of the first electrode and the second electrode of all the light emitting elements so as to approach And a second means.

In any one of Claims 3 thru | or 7,
When measuring the total current flowing between the first electrode and the second electrode of the light emitting element before Symbol whole hand, the light emitting device characterized by certain image is displayed on the pixel portion.

In any one of claims 3 to 8,
The pixel portion includes a pixel having a light emitting element corresponding to red, a pixel having a light emitting element corresponding to green, and a pixel having a light emitting element corresponding to blue,
The light emitting device characterized in that the first and second means are provided for each corresponding color of the light emitting element .

In any one of Claims 1 thru | or 9,
When the difference between the current value measured by the first means and the reference current value is a deviation current, and the voltage that is changed by the correction by the second means is a correction voltage,
A predetermined correction voltage corresponding to each region of the deviation current divided into a plurality of regions having a certain width is preset,
A light emitting device, wherein a voltage between the first electrode and the second electrode of the light emitting element is corrected based on a preset relationship between the deviation current and the correction voltage.

A pixel portion provided with a light emitting element having first and second electrodes;
Variable power supply ,
An ammeter for measuring a current flowing between the first electrode and the second electrode of the light emitting element ;
Comparing the current value as a current value and the reference measured by the ammeter, so that the current flowing between the first electrode and the second electrode of the light emitting element approaches the current value serving as the reference, the light emitting A light-emitting device comprising: a correction circuit that corrects a voltage between a first electrode and a second electrode of an element by controlling the variable power supply.

In claim 11,
The light-emitting device, wherein a specific image is displayed on the pixel portion when measuring a current flowing between the first electrode and the second electrode of the light-emitting element.

A light emitting device having first and second electrodes;
A pixel portion provided with a plurality of pixels each having the light emitting element ;
Variable power supply,
An ammeter for measuring the total current flowing between the first electrode and the second electrode of all the light emitting elements provided in the pixel portion ;
Comparing the current value as a current value and the reference measured by the ammeter, the current value sum of the current flowing between the first electrode and the second electrode of the light emitting element before Symbol whole hand becomes the reference it approaches manner, the first electrode and the voltage between the second electrode, the light emitting device characterized by having a correction circuit for correcting by controlling the variable power supply of the light emitting element before Symbol whole hand.

In claim 13,
The light emitting device, wherein a specific image is displayed on the pixel portion when measuring a total of currents flowing between the first electrode and the second electrode of all the light emitting elements.

In claim 13 or 14 ,
The pixel portion includes a pixel having a light emitting element corresponding to red, a pixel having a light emitting element corresponding to green, and a pixel having a light emitting element corresponding to blue,
The light-emitting device , wherein the variable power source, the ammeter , and the correction circuit are provided for each corresponding color of the light-emitting element .

In any one of Claims 11 thru | or 15,
When the difference between the current value measured by the ammeter and the current value serving as the reference is a deviation current, and the voltage that is changed by correction by the correction circuit is a correction voltage
A predetermined correction voltage corresponding to each region of the deviation current divided into a plurality of regions having a certain width is preset,
A light emitting device, wherein a voltage between the first electrode and the second electrode of the light emitting element is corrected based on a preset relationship between the deviation current and the correction voltage.

In any one of claims 11 to 16,
The pixel portion is formed on a first substrate;
The variable power source, the ammeter, and the correction circuit are formed on a second substrate ,
The light emitting device, wherein the second substrate is mounted on the first substrate .

In claim 17 ,
The light emitting device, wherein the second substrate is attached to the first substrate by a COG method or a wire bonding method .

In any one of claims 1 to 18, the light emitting device and displaying gradation by controlling the time for emission of the light emitting element by a digital video signal.

An electronic device using the light emitting device according to claim 1 for a display portion.

The electronic device according to claim 20 is a video camera, a digital camera, a goggle type display, a navigation system, an audio playback device, a notebook personal computer, a game device, a portable information terminal, a mobile phone, an electronic book, an image playback device, or TV.