Flat panel display with improved white balance

• US 7,285,902 B2
• Filed: 04/02/2004
• Issued: 10/23/2007
• Est. Priority Date: 04/17/2003
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung SDI Company Limited
• Inventors: Kim, Jin-Soo, Park, Sang-Il, Koo, Jae-Bon, Lee, Ul-Ho, Jung, Jin-Woung, Lee, Chang-Gyu
• Primary Examiner(s): Williams; Joseph
• Assistant Examiner(s): Won; Bumsuk
• Application Number:
  US10/815,792
• Publication Number:
  US 20040207583A1
• Time in Patent Office: 1,299 Days
• Field of Search: 313/500
• US Class Current: 313/500
• CPC Class Codes: H01L 27/12 the substrate being other than a semiconductor body, e.g. an insulating body
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• CPC Class Codes: H01L 27/1222 with a particular composition, shape or crystalline structure of the active layer
• CPC Class Codes: H01L 29/78624 the source and the drain regions being asymmetrical
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/352 the areas of the RGB subpixels being different
• CPC Class Codes: H10K 59/353 characterised by the geometrical arrangement of the RGB subpixels

Abstract

Disclosed is a flat panel display capable of enhancing a white balance by making a doping concentration or shape and size of drain offset regions of driving transistors different, in R, G and B unit pixels of each pixel. A flat panel display, comprises a plurality of pixels, where each of pixels including R, G and B unit pixels to embody red (R), green (G) and blue (B) colors, respectively. Each of the unit pixels includes a transistor with source/drain regions. Transistors of at least two unit pixels of the R, G and B unit pixels have drain regions of different geometric structures. In each unit pixel, a resistance value of the drain region of the transistor to drive a light-emitting device having the highest luminous efficiency among the transistors is higher than that of the drain region of a transistor to drive the light-emitting device having a relatively low luminous efficiency.

Claims

1. A flat panel display, comprising:

a plurality of pixels, each of the plurality of pixels including R, G and B unit pixels to embody red (R), green (G) and blue (B) colors, respectively, each of unit pixels including a transistor with source/drain regions,

wherein transistors of at least two unit pixels of the R, G and B unit pixels have drain regions of different geometric structures, and

wherein the drain regions of the transistors of the R, G and B unit pixels are of zigzag shapes.

2. The flat panel display according to claim 1, wherein each unit pixel further includes a light emitting device driven by the transistor, and the drain region of a transistor to drive the light emitting device having the highest luminous efficiency of the light emitting devices among the transistors in the unit pixels has a longer length compared with lengths of drain regions of transistors to drive light emitting devices having a relatively lower luminous efficiency.

3. The flat panel display according to claim 1, wherein the drain regions of the transistors of the R, G and B unit pixels include offset regions having different geometric structures from one another, respectively.

4. The flat panel display according to claim 3, wherein each unit pixel further includes a light-emitting device driven by the transistor, and the drain offset region of the transistor to drive the light emitting device having the highest luminous efficiency among the transistors in the unit pixels has a longer length, in comparison with lengths of drain offset regions of transistors to drive light emitting devices having a relatively low luminous efficiency.

5. The flat panel display according to claim 3, wherein the drain offset regions of the transistors of the R, G and B unit pixels are of zigzag shapes.

6. The flat panel display according to claim 1, wherein the unit pixels further include light-emitting devices, respectively, and channel layers of the transistors controlling currents supplied to the light emitting devices of the unit pixels are of same size.

7. A flat panel display, comprising:

a plurality of pixels, each of the plurality of pixels including R, G and B unit pixels to embody red (R), green (G) and blue (B) colors, respectively, each of unit pixels including a transistor with source/drain regions,

wherein transistors of at least two unit pixels of the R, G and B unit pixels have drain regions of different geometric structures, and

wherein the drain regions of the transistors of the R, G and B unit pixels are of a construction having a same width and a different length from one another.

8. The flat panel display according to claim 7, wherein each unit pixel further includes a light emitting device driven by the transistor, and the drain region of a transistor to drive the light emitting device having the highest luminous efficiency of the light emitting devices among the transistors in the unit pixels has a longer length compared with lengths of drain regions of transistors to drive light emitting devices having a relatively lower luminous efficiency.

9. The flat panel display according to claim 7, wherein the drain regions of the transistors of the R, G and B unit pixels include offset regions having different geometric structures from one another, respectively.

10. The flat panel display according to claim 9, wherein each unit pixel further includes a light-emitting device driven by the transistor, and the drain offset region of the transistor to drive the light emitting device having the highest luminous efficiency among the transistors in the unit pixels has a longer length in comparison with lengths of drain offset regions of transistors to drive light emitting devices having a relatively low luminous efficiency.

11. The flat panel display according to claim 9, wherein the drain regions of the transistors of the R, G and B unit pixels include offset regions having a same width and a different length from one another.

12. The flat panel display according to claim 7, wherein the unit pixels further include light-emitting devices, respectively, and channel layers of the transistors controlling currents supplied to the light emitting devices of the unit pixels are of same size.

13. A flat panel display, comprising:

a plurality of pixels, each of the plurality of pixels including R, G and B unit pixels to embody red (R), green (G) and blue (B) colors, respectively, each of unit pixels including a transistor with source/drain regions,

wherein transistors of at least two unit pixels of the R, G and B unit pixels have drain regions of different geometric structures, and

wherein the drain regions of the transistors of the R, G and B unit pixels include offset regions having a same length and a different width from one another.

14. The flat panel display according to claim 13, wherein each unit pixel further includes a light-emitting device driven by the transistor, and the drain offset region of the transistor to drive the light emitting device having the highest luminous efficiency among the transistors in the unit pixels has a narrower width in comparison with widths of drain offset regions of transistors to drive light emitting devices having a relatively low luminous efficiency.

15. The flat panel display according to claim 13, wherein the unit pixels further include light-emitting devices, respectively, and channel layers of the transistors controlling currents supplied to the light emitting devices of the unit pixels are of same size.