Image display device

• US 8,605,069 B2
• Filed: 02/08/2008
• Issued: 12/10/2013
• Est. Priority Date: 03/16/2007
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated), Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Kasai, Naruhiko, Ishii, Masato, Miyamoto, Mitsuhide, Kohno, Tohru, Akimoto, Hajime
• Primary Examiner(s): Boddie, William
• Assistant Examiner(s): Edwards, Carolyn R
• Application Number:
  US12/028,070
• Publication Number:
  US 20080224962A1
• Time in Patent Office: 2,132 Days
• Field of Search: None
• US Class Current: 345/211
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G09G 2300/0465 Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2320/029 by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
• CPC Class Codes: G09G 2320/0295 by monitoring each display pixel
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3275 Details of drivers for data electrodes
• CPC Class Codes: G09G 5/18 Timing circuits for raster scan displays specially adapted for television H04N ; synchronisation between the display unit and other display units, videodisc player G09G5/12

Abstract

An image display device includes switches directly connected a constant current source to a self-luminous element to be able to detect a characteristic of the self-luminous element, generate a coordinates and convert information of the characteristic and coordinates into a system communication signal, transferring an input with a temperature variation to a system side.

Claims

1. The image display device including a touch panel input function, comprising:

a display unit comprised of a plurality of pixels each of which includes a self-luminous element;

signal lines configured to input a display signal voltage to the pixel;

a display control circuit configured to control the display signal voltage;

detection lines configured to output a characteristic of the self-luminous element included in each of the pixels;

a detection use power source for applying current to the self-luminous element;

change-over switches; and

a detection positional coordinates generation circuit,

wherein the detection use power source is connected with the pixels through the detection lines and the change-over switches,

wherein the detection lines are connected with the detection positional coordinates generation circuit through the change-over switches, and

wherein the detection positional coordinates generation circuit configured to output temperature information and a coordinates signal corresponding to one of the pixels on which an input motion causes a temperature variation based on the characteristic of the self-luminous element included in each of the pixels,

wherein a presence or absence of a touch panel input is determined in response to temperature information output by the detection positional coordinates generation circuit, and

wherein the absence of touch panel input is determined if the temperature information output by the detection positional coordinates generation circuit is smaller than a first threshold value,

the presence of touch panel input is determined if the temperature information is larger than the first threshold value or smaller than a second threshold value,

a sliding motion is determined if the temperature information is larger than the second threshold value.

2. The image display device, including a touch panel input function, comprising:

a display unit comprised of a plurality of pixels each of which includes a self-luminous element;

a shared line configured to input a display signal voltage to the pixel and to output a characteristic of the self-luminous element included in each of the pixel;

a detection circuit configured to detect a characteristic of the self-luminous element included in each of the pixel; and

a display control circuit configured to control the display signal voltage and to share the shared line with the detection circuit,

wherein the detection circuit comprises;

shared change-over switches;

a detection use power source for applying current to the self-luminous element;

power source change-over switches; and

a detection positional coordinates generation circuit,

wherein the detection use power source is connected with the pixels through the shared line, the shared change-over switches and the power source change-over switches,

wherein the shared line is connected with the detection positional coordinates generation circuit through the power source change-over switches, and

wherein the detection positional coordinates generation circuit configured to output temperature information and a coordinates signal corresponding to one of the pixels on which an input motion causes a temperature variation based on the characteristic of the self-luminous element included in each of the pixels,

wherein a presence or absence of a touch panel input is determined in response to temperature information output by the detection positional coordinates generation circuit, and

wherein the absence of touch panel input is determined if the temperature information output by the detection positional coordinates generation circuit is smaller than a first threshold value,

the presence of touch panel input is determined if the temperature information is larger than the first threshold value or smaller than a second threshold value,

a sliding motion is determined if the temperature information is larger than the second threshold value.

3. The image display device including a touch panel input function, comprising:

a display unit comprised of a plurality of pixels each of which includes a self-luminous element;

signal lines configured to input a display signal voltage to the pixel;

a display control circuit configured to control the display signal voltage;

detection lines configured to output a characteristic of the self-luminous element included in each of the pixels; and

a detection use power source for applying current to the self-luminous element;

change-over switches;

a detection positional coordinates generation circuit; and

a system I/F converting circuit,

wherein the detection use power source is connected with the pixels through the detection lines and the change-over switches,

wherein the detection lines are connected with the detection positional coordinates generation circuit,

wherein the detection positional coordinates generation circuit configured to output temperature information and a coordinates signal corresponding to one of the pixels on which an input motion causes a temperature variation based on the characteristic of the self-luminous element included in each of the pixels, and

wherein the system I/F converting circuit configured to convert the temperature information and the coordinates signal into a communication signal to a system which is connected with the image display device,

wherein a presence or absence of a touch panel input is determined in response to temperature information output by the detection positional coordinates generation circuit, and

wherein the absence of touch panel input is determined if the temperature information output by the detection positional coordinates generation circuit is smaller than a first threshold value,

the presence of touch panel input is determined if the temperature information is larger than the first threshold value or smaller than a second threshold value,

a sliding motion is determined if the temperature information is larger than the second threshold value.

4. The image display device including a touch panel input function, comprising:

a display unit comprised of a plurality of pixels each of which includes a self-luminous element;

a shared line configured to input a display signal voltage to the pixel and to output a characteristic of the self-luminous element included in each of the pixel;

a detection circuit configured to detect the characteristic of the self-luminous element included in each of the pixel;

a display control circuit configured to control the display signal voltage and to share the shared line with the detection circuit; and

a system I/F converting circuit,

wherein the detection circuit comprises;

shared change-over switches;

a detection use power source for applying current to the self-luminous element;

power source change-over switches, and a detection positional coordinates generation circuit,

wherein the detection use power source is connected with the pixels through the shared line, the shared change-over switches and the power source change-over switches,

wherein the shared line is connected with the detection circuit through the shared change-over switches and the power source change-over switches,

wherein the detection positional coordinates generation circuit configured to output a temperature information and a coordinates signal corresponding to one of the pixels on which an input motion causes a temperature variation based on the characteristic of the self-luminous element included in each of the pixels, and

wherein the system I/F converting circuit configured to convert the temperature information and the coordinates signal into a communication signal to a system which is connected with the image display device,

wherein a presence or absence of a touch panel input is determined in response to temperature information output by the detection positional coordinates generation circuit,

wherein the absence of touch panel input is determined if the temperature information output by the detection positional coordinates generation circuit is smaller than a first threshold value,

the presence of touch panel input is determined if the temperature information is larger than the first threshold value or smaller than a second threshold value, and

a sliding motion is determined if the temperature information is larger than the second threshold value.