Electroluminescent display device

• US 20050168134A1
• Filed: 11/05/2004
• Published: 08/04/2005
• Est. Priority Date: 12/10/2003
• Status: Active Grant

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Nishikawa, Ryuji
• Granted Patent: US 7,098,592 B2
• Time in Patent Office: Days
• US Class Current: 313/500
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: H01L 31/147 the light sources and the devices sensitive to radiation all being semiconductor devices characterised by potential barriers
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens

Abstract

In an organic electroluminescent display device having a touch panel function, the number of components is reduced and accuracy in positional detection of a pointing object is improved. A display portion, and light source portions and detecting portions respectively formed along sides of the display portion are formed on a same substrate to form a display panel. Then, first reflecting boards which reflect light emitted by the light source portions in a horizontal direction along an emissive surface of the display portion, and second reflecting boards which reflect the light reflected by the first reflecting boards and enters the light in the light detecting portions through a back surface of the display portion are respectively formed at ends of a storage capacitor of a display panel.

Claims

1. An electroluminescent display device comprising:

a display portion comprising a plurality of display pixels arranged in a matrix, each of the pixels comprising a display electroluminescent element and a driving transistor driving the display electroluminescent element;

a light source portion comprising a plurality of light source electroluminescent elements and provided along a first side of the display portion;

a light detecting portion comprising a plurality of light sensors and provided along a second side of the display portion, the second side being opposite from the first side;

a first reflecting board reflecting light emitted by the light source portion in a horizontal direction along a front surface of the display portion; and

a second reflecting board reflecting the light reflected by the first reflecting board so as to lead the light into the light detecting portion through a back surface of the display portion.

2. The electroluminescent display device of claim 1, wherein the display electroluminescent element is of a top emission type, the driving transistor comprises a thin film transistor of a top gate type, and the light sensor comprises a thin film transistor of a top gate type.

3. The electroluminescent display device of claim 1, wherein the display electroluminescent element is of a bottom emission type, the driving transistor comprises a thin film transistor of a top gate type, and the light sensor comprises a thin film transistor of a bottom gate type.

4. The electroluminescent display device of claim 1, wherein the display portion, the light source portion and the light detecting portion are disposed on a substrate.

5. The electroluminescent display device of claim 1, wherein the first and second reflecting boards are provided along the first and second sides of the display portion, respectively.

6. The electroluminescent display device of claim 2, wherein the display portion, the light source portion and the light detecting portion are formed on a substrate.

7. The electroluminescent display device of claim 2, wherein the first and second reflecting boards are provided along the first and second sides of the display portion, respectively.

8. The electroluminescent display device of claim 3, wherein the display portion, the light source portion and the light detecting portion are formed on a substrate.

9. The electroluminescent display device of claim 3, wherein the first and second reflecting boards are provided along the first and second sides of the display portion, respectively.

10. The electroluminescent display device of claim 1, wherein the second reflecting board is configured to cover an edge of the display portion at the second side of the display portion.