The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 2012
Filed:
Feb. 23, 2006
Tetsuo Fujita, Mie, JP;
Masafumi Kokura, Tottori, JP;
Mitsunori Harada, Mie, JP;
Hijiri Nakahara, Mie, JP;
Yoshiharu Kataoka, Mie, JP;
Tetsuo Fujita, Mie, JP;
Masafumi Kokura, Tottori, JP;
Mitsunori Harada, Mie, JP;
Hijiri Nakahara, Mie, JP;
Yoshiharu Kataoka, Mie, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A difference of work functions in different metal thin films is suppressed without causing the increase of the manufacturing steps or the decrease of the optical performance. In a semi-transmissive reflective liquid crystal display apparatusincluding a reflective electrodeand a transmissive electrodein the pixel electrode, the surface of the reflective electrodeis subject to a plasma treatment, so that the work function of the reflective electrodeis controlled by changing by a value of 0.1 eV from the original value. Thus, it is possible to place the work function of the reflective electrodewithin a difference of ±0.2 eV with respect to the work function of the transmissive electrode. As a result, a number of the manufacturing steps is not increased or no optical performance is decreased, unlike conventional liquid crystal display apparatuses. Even if the optimum direct current offset voltage is applied to one of the reflective electrodeand the transmissive electrode, it is possible to reduce the deterioration of an image display quality resulting from the difference with the optimum direct current offset voltage for the other electrode. As such, it is possible to improve the display quality of the liquid crystal display apparatus