Display device with coordinate input function

• US 5,162,782 A
• Filed: 04/30/1990
• Issued: 11/10/1992
• Est. Priority Date: 08/28/1989
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Yoshioka, Kazuo
• Primary Examiner(s): Oberley, Alvin E.
• Assistant Examiner(s): Mengistu, Amare
• Application Number:
  US07/516,550
• Time in Patent Office: 925 Days
• Field of Search: 340/706, 340/716, 340/765, 340/784, 340/712, 178/18, 359/53, 359/103
• US Class Current: 345/104
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally

Abstract

In a display device with coordinate input function according to the invention, since transparent electrodes for inputting coordinates, are disposed in an X-Y matrix form on a compensation cell provided to a liquid crystal display panel of two-layer type, the coordinate input can be performed even in the case of employing a liquid crystal display panel divided into two, upper and lower parts to drive its display screen.

Claims

1. A display device with coordinate input function having a liquid crystal display panel for both displaying images and inputting coordinates, comprising:

a sensor means for sensing coordinate input detection signals from a control means;

a liquid crystal display panel of two-layer type including an optical phase liquid crystal compensation cell as a first layer of the liquid crystal display panel and a liquid crystal display cell as a second layer of the liquid crystal display panel; and

a plurality of transparent electrodes arranged on said compensation cell in an X-Y matrix form, for inputting the coordinate input detection signals to said sensor means.

2. A display device with coordinate input function as set forth in claim 1, wherein an image display screen of the liquid crystal display panel of two-layer type is divided into plural areas to be separately driven.