DISPLAY DEVICE

• US 20070171156A1
• Filed: 11/17/2006
• Published: 07/26/2007
• Est. Priority Date: 05/17/2004
• Status: Abandoned Application

• Current Assignee: Fuji Electric Holdings Company Limited (Fuji Electric Systems Company Limited)
• Original Assignee: Fuji Electric Holdings Company Limited (Fuji Electric Systems Company Limited)
• Inventors: KAWAKAMI, Haruo, KATO, Hisato, YAMASHIRO, Keisuke
• Application Number:
  US11/561,173
• Publication Number:
  US 20070171156A1
• Time in Patent Office: Days
• US Class Current: 345/76
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2310/066 Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays

Abstract

The organic EL display device includes first and second sets of stripe electrodes; third and fourth sets of stripe electrodes crossing the stripe electrodes of the first and second sets; and pixels, each including a light emitting section, one of the electrodes of which is connected electrically to the stripe electrode of the first set, a transistor element connected electrically to the stripe electrode of the fourth set and to the other electrode of the light emitting section, the transistor element controlling the current flowing through the light emitting section, a first rectifying element connected to the gate electrode of the transistor element and the stripe electrode of the second set, a second rectifying element connected to the gate electrode of the transistor element and the stripe electrode of the third set, and a capacitor connected to the gate electrode of the transistor element and the stripe electrode of the fourth set.

Claims

1. A display device comprising:

a substrate;

a first set of stripe electrodes formed in parallel to each other on the substrate;

a second set of stripe electrodes formed on the substrate corresponding to the respective stripe electrodes of the first set, the stripe electrodes of the second set being formed in parallel to each other and in parallel to the stripe electrodes of the first set;

a third set of stripe electrodes formed in parallel to each other on the substrate, the stripe electrodes of the third set crossing the stripe electrodes of the first and second sets;

a fourth set of stripe electrodes formed on the substrate corresponding to the respective stripe electrodes of the third set, the fourth set being formed in parallel to each other and in parallel to the stripe electrodes of the third set;

a fifth set of stripe electrodes formed on the substrate corresponding to the respective stripe electrodes of the third set, the stripe electrodes of the fifth set being formed in parallel to each other and in parallel to the stripe electrodes of the third and fourth sets;

pixels at the respective points on the substrate, where any of the stripe electrodes of the first set and any of the stripe electrodes of the fourth set cross each other on two levels;

each of the pixels comprising;

a light emitting section, one of the electrodes of which is connected electrically to the stripe electrode of the first set corresponding to the each of the pixels;

a transistor element connected electrically to the stripe electrode of the fourth set corresponding to each of the pixels and the other one of the electrodes of the light emitting section, in order to control the current flowing through the light emitting section from the stripe electrode of the first set to the stripe electrode of the fourth set or vice versa in each of the pixels;

a first rectifying element connected electrically to the gate electrode of the transistor element and the stripe electrode of the second set corresponding to each of the pixels;

a second rectifying element connected electrically to the gate electrode of the transistor element and the stripe electrode of the third set corresponding to each of the pixels;

a capacitor connected electrically to the gate electrode of the transistor element and the stripe electrode of the fifth set corresponding to each of the pixels; and

the first rectifying element and the second rectifying element being connected such that the forward direction of the first rectifying element and the forward direction of the second rectifying element coincide with each other between the stripe electrodes of the second and third sets in the each of the pixels.

2. The display device according to claim 1, wherein at least one of the transistor, the rectifying elements and the capacitor comprises an organic electronic material.

3. A display device comprising:

a substrate;

a set of stripe-shaped data electrodes formed in parallel to each other on the substrate;

a set of stripe-shaped scanning electrodes formed in parallel to each other on the substrate, the scanning electrodes crossing the data electrodes;

pixels at respective points on the substrate where any of the data electrodes and any of the scanning electrodes cross each other on two levels;

each of the pixels comprising;

a light emitting section, a transistor element controlling the current flowing through the light emitting section, a rectifying element, and the gate electrode of the transistor element being connected electrically to the relevant data electrode via the rectifying element; and

constant current circuits connected electrically to the respective data electrodes.

4. The display device according to claim 3, the display device further comprising:

other rectifying elements and constant voltage sources;

each of the constant voltage sources being connected electrically to the relevant data electrode, in parallel to the relevant constant current circuit, via each of the other rectifying elements; and

wherein the polarity of the terminal of the other rectifying element connected to the relevant data electrode is the same as the polarity of the terminal of the rectifying element in each of the pixels connected to the relevant data electrode.

5. The display device according to claim 3, wherein the rectifying element connected to each of the pixels comprises an organic electronic material.

6. The display device according to claim 4, wherein the rectifying element connected to each of the pixels comprises an organic electronic material.