IMAGE DISPLAY APPARATUS AND METHOD FOR OPERATING THE SAME

• US 20130002729A1
• Filed: 06/06/2012
• Published: 01/03/2013
• Est. Priority Date: 06/09/2011
• Status: Abandoned Application

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: LEE, Sangho, LEE, Jae Il
• Application Number:
  US13/490,148
• Publication Number:
  US 20130002729A1
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2310/066 Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
• CPC Class Codes: G09G 2320/0257 Reduction of after-image effects
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/022 in absence of operation, e.g. no data being entered during a predetermined time
• CPC Class Codes: G09G 2330/04 Display protection
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 2340/14 Solving problems related to the presentation of information to be displayed
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/2022 using sub-frames
• CPC Class Codes: G09G 3/288 using AC panels
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 5/00 Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators image data processing or generation, in general G06T

Abstract

An image display apparatus and a method for operating the same are disclosed. The method for operating an image display apparatus includes entering a blackboard mode, receiving an image, inverting a gray level of the received image, and displaying the image with the inverted gray level. Accordingly, it is possible to improve visibility in a blackboard mode.

Claims

1. A method for operating an image display apparatus, comprising:

entering a blackboard mode;

receiving an image;

inverting a gray level of the received image; and

displaying the image with the inverted gray level.

2. The method according to claim 1, wherein the inverting is performed only when the number of colors of the received image is less than or equal to a predetermined value.

3. The method according to claim 1, wherein the inverting is performed when luminance of a background region of the received image is higher than luminance of a region excluding the background region.

4. The method according to claim 1, wherein the inverting includes:

separating the gray level of the received image into a first group and a second group, and

inverting the gray level of an image corresponding to the separated first group into the gray level of a second inversion group and inverting the gray level corresponding to the second group having the gray level lower than that of the first group into the gray level of a first inversion group.

5. The method according to claim 4, wherein a difference between a maximum gray level and a minimum gray level of the second inversion group is less than a difference between a maximum gray level and a minimum gray level of the first group.

6. The method according to claim 1, wherein the inverting includes:

separating the gray level of the received image into a first group, a second group and a third group between the first group and the second group; and

inverting the gray level of an image corresponding to the separated first group into the gray level of a second inversion group and inverting the gray level corresponding to the second group having the gray level lower than that of the first group into the gray level of a first inversion group; and

wherein the gray level of an image corresponding to the third group is not inverted.

7. The method according to claim 1, further comprising separating the image into a chrominance signal and a luminance signal,

wherein the inverting includes inverting the gray level of the separated luminance signal.

8. The method according to claim 7, wherein the displaying includes displaying only the inverted luminance signal.

9. The method according to claim 1, wherein the inverting includes inverting the gray level of the received image into a first gray level and a second gray level.

10. The method according to claim 1, wherein the entering the blackboard mode includes entering the blackboard mode if the number of colors of the received image is less than or equal to a predetermined value and the image, in which the number of colors is less than or equal to the predetermined number, is maintained for a predetermined time.

11. The method according to claim 1, further comprising displaying a menu including an object for setting a color, the gray level of which will be inverted, or an object for setting a color to be displayed in the blackboard mode.

12. A method for operating an image display apparatus, comprising:

entering a blackboard mode;

receiving an image;

performing complementary gamma signal processing with respect to the received image; and

displaying the image subjected to complementary gamma processing.

13. The image display apparatus according to claim 12, wherein the complementary gamma signal processing is performed only when the number of colors of the received image is less than or equal to a predetermined value or luminance of a background region of the received image is higher than luminance of a region excluding the background region.

14. The method according to claim 12, further comprising separating the received image into a chrominance signal and a luminance signal,

wherein the performing of the complementary gammas signal processing includes performing complementary gamma signal processing with respect to the separated luminance signal.

15. The method according to claim 14, wherein the displaying includes displaying only the luminance signal subjected to the complementary gamma signal processing.

16. An image processing apparatus comprising:

an input signal processor configured to process a received image and output the processed image;

a gray level inverter configured to invert a gray level of the image when entering a backboard mode; and

a display configured to display the image with the inverted gray level.

17. The image display apparatus according to claim 16, further comprising a signal separator configured to separate the image into a chrominance signal and a luminance signal,

wherein the gray level inverter inverts the gray level of the separated luminance signal.

18. The image display apparatus according to claim 16, wherein the gray level inverter inverts the gray level of the image if the number of colors of the received image is less than or equal to a predetermined value and luminance of a background region of the received image is higher than luminance of a region excluding the background region.

19. An image display apparatus comprising:

an input signal processor configured to process a received image and output the processed image;

a complementary gamma processor configured to perform complementary gamma signal processing with respect to the received image signal when entering a blackboard mode; and

a display configured to display the image subjected to complementary gamma signal processing.

20. The image display apparatus according to claim 19, further comprising a signal separator configured to separate the image into a chrominance signal and a luminance signal,

wherein the complementary gamma processor performs complementary gamma signal processing with respect to the separated luminance signal.