Tablet integrated liquid crystal display apparatus with less parallax

• US 6,504,584 B2
• Filed: 05/02/2001
• Issued: 01/07/2003
• Est. Priority Date: 01/02/1997
• Status: Expired due to Term

• Current Assignee: Vista Peak Ventures LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: NEC Corporation
• Inventors: Hirai, Yoshihiko, Mizobata, Eishi, Ikeda, Naoyasu
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): DUONG, TAI V
• Application Number:
  US09/846,257
• Publication Number:
  US 20010020986A1
• Time in Patent Office: 615 Days
• Field of Search: 349/12, 349/113, 349/122, 349/139, 349/138, 349/155, 349/156, 349/158, 349/165, 178/18, 178/19, 345/104, 345/173, 345/176, 345/179, 345/182
• US Class Current: 349/12
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/13725 based on guest-host interaction G02F1/13762, G02F1/13737, take precedence
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

In a tablet integrated type liquid crystal display apparatus, a first transparent substrate is provided on a view side. The first substrate is a plastic substrate having a thickness equal to or thinner than 0.6 mm, and a counter electrode is formed on the first substrate. A second substrate on which a driving layer composed of switching elements and pixel electrodes respectively connected to the switching elements is formed. The second substrate is a glass substrate having a thickness in a range of 0.6 mm to 1.1 mm. A guest host liquid crystal layer sandwiched by the first substrate and the second substrate such that the guest host liquid crystal is driven by a voltage applied between the counter electrode and the pixel electrode. A tablet electrode layer may be provided between the first substrate and the counter electrode.

Claims

1. A liquid crystal display apparatus comprising:

a pixel electrode substrate having a plurality of pixel electrodes arranged in a matrix;

a counter electrode substrate having at least one electrode arranged in correspondence to said plurality of pixel electrodes; and

a guest-host liquid crystal layer interposed between said pixel electrode substrate and said counter electrode substrate,

wherein said pixel electrode substrate is composed of a glass substrate, and said counter electrode substrate is composed of a plastic film having a thickness equal to or less than 0.6 mm,

said counter electrode substrate is provided on a viewer side, whereby change in transmissivity ratio with change in spacing between said counter electrode and said pixel electrode due to bending of said counter electrode substrate is limited while parallax across said counter electrode substrate is substantially eliminated, and wherein each of said plurality of pixel electrodes is composed of a metal reflection electrode.

2. The liquid crystal display apparatus according to claim 1, where said pixel electrode substrate has an insulating film with uneven portions, and said pixel electrode substrate is formed on or above said uneven portions of said insulating film.