Display device

• US 5,172,104 A
• Filed: 02/07/1990
• Issued: 12/15/1992
• Est. Priority Date: 02/13/1989
• Status: Expired due to Fees

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Sato, Yoshikazu, Tanigaki, Yasushi
• Primary Examiner(s): Weldon, Ulysses
• Assistant Examiner(s): Fatahiyar, M.
• Application Number:
  US07/478,125
• Time in Patent Office: 1,042 Days
• Field of Search: 340/783, 340/784, 340/785, 340/707, 340/719, 358/241, 350/332, 350/333, 350/334, 350/342, 350/345
• US Class Current: 345/84
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means

Abstract

An active display device with picture elements (9) arranged in a matrix is driven via active switches (1). Part of the picture electrodes (9) are driven via light per actuated switches (9) between the picture electrodes and a read-out electrode (5).

Claims

1. A display device having a first substrate, on which pixel electrodes and correspondingly therewith active elements are provided, a display material and a second substrate, the first and second substrate being disposed on opposite sides to each other with respect to the display material sandwiched therebetween, said display device CHARACTERIZED in that said active elements are two terminal devices, the first substrate is provided thereon with photo-sensitive elements each for a predetermined number of ones of the pixel electrodes and comprises at least one semiconductor materials which are included in the active elements, said first substrate being provided with a group of signal electrodes, which extend in either a row or a column direction and are connected to the pixel electrodes and with a group of read-out electrodes which extend in the same direction as said signal electrodes and are connected to said photo-sensitive electrodes, the second substrate being provided thereon with a group of scan electrodes which extend in a direction perpendicular to the direction in which said signal electrodes extend.

2. A display device according to claim 1 characterized in that each of said photo-sensitive elements is constructed so as to be sensitive mainly to radiation other than visible radiation, and in that a filter for blocking the visible radiation is provided correspondingly to said photo-sensitive elements in said display device on a display screen side of said photo-sensitive elements.

3. A display device according to claim 2, characterized in that said filter comprises colored areas each of which has one of the three primary colors red, blue and green and corresponds to a respective one of said pixel electrodes.

4. A display device according to claim 1, further comprising scanning means for sequentially driving said scan electrodes within each display period;

signal-electrode driving means for sequentially driving said signal electrodes within a period of driving of each scan electrode in accordance with information of a picture to be displayed;

read-out electrode driving means for sequentially driving in response to a sampling signal within the period of driving of each scan electrode; and

detecting means for detecting, in accordance with currents which flow through said photo-sensitive elements in response to said sampling signal, that one of said photo-sensitive elements is receiving radiation.

5. A display device according to claim 2, further comprising scanning means for sequentially driving said scan electrodes within each display period;

signal-electrode driving means for sequentially driving said signal electrodes within a period of driving of each scan electrode in accordance with information of a picture to be displayed;

read-out electrode driving means for sequentially driving in response to a sampling signal within the period of driving of each scan electrode; and

detecting means for detecting, in accordance with currents which flow through said photo-sensitive elements in response to said sampling signal, that one of said photo-sensitive elements is receiving radiation.

6. A display device according to claim 3, further comprising scanning means for sequentially driving said scan electrodes within each display period;

signal-electrode driving means for sequentially driving said signal electrodes within a period of driving of each scan electrode in accordance with information of a picture to be displayed;

read-out electrode driving means for sequentially driving in response to a sampling signal within the period of driving of each scan electrode; and

detecting means for detecting, in accordance with currents which flow through said photo-sensitive elements in response to said sampling signal, that one of said photo-sensitive elements is receiving radiation.