Liquid crystal display apparatus

• US 7,692,622 B2
• Filed: 04/27/2005
• Issued: 04/06/2010
• Est. Priority Date: 04/27/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Jin-bog, Kim, Hyun-suk
• Primary Examiner(s): Dharia; Prabodh M
• Application Number:
  US11/115,234
• Publication Number:
  US 20050237293A1
• Time in Patent Office: 1,805 Days
• Field of Search: 345/600, 345/82, 345/629, 345/601, 345/92, 345/102, 345/147, 345/150, 345/153, 345/154, 345/211, 345/214, 345/691, 362/610, 362/494, 362/694, 362/295, 362/231, 359/586, 348/333.08, 348/441, 349/68, 353/31
• US Class Current: 345/102
• CPC Class Codes: G09G 2320/0606 Manual adjustment
• CPC Class Codes: G09G 2320/0633 by amplitude modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix

Abstract

An LCD apparatus with an LCD panel displaying a picture thereon, including a backlight array in which a plurality of light emitting devices illuminating the LCD panel with a plurality of colors is arranged to have a predetermined pattern. A backlight driver drives each light emitting device to emit light and to adjust light intensity; and a controller controls the backlight driver to adjust a white balance of a picture displayed on the LCD panel. With this configuration, an LCD apparatus is provided, in which a white balance is adjusted without making a loss in a representable brightness level, i.e., brightness, and lowering a contrast ratio. Also included is an LCD apparatus, in which a white balance is adjusted according to formats of an input video signal.

Claims

1. An LCD apparatus with an LCD panel, comprising:

a backlight array in which a plurality of light emitting devices illuminate the LCD panel with a plurality of colors;

a backlight driver which drives the plurality of light emitting devices to emit light and to adjust light intensity; and

a controller which controls the backlight driver to adjust a white balance of a picture displayed on the LCD panel,

wherein the light emitting devices comprise a red light emitting diode, a green light emitting diode, and a blue light emitting diode,

further comprising a format determiner which determines a format of an input video signal based on characteristics of the video signal,

wherein the controller controls the backlight driver to adjust the white balance of the picture displayed on the LCD panel according to the format of the video signal as determined by the format determiner.

2. The LCD apparatus according to claim 1, wherein the format determiner determines the format of the video signal based on a horizontal frequency and/or a vertical frequency of the video signal.

3. The LCD apparatus according to claim 1, further comprising a user input unit generating a first control signal when operated by a user, wherein

the controller controls the backlight driver to adjust the white balance of the picture displayed on the LCD panel according to the first control signal from the user input unit.

4. The LCD apparatus according to claim 3, wherein the controller controls the backlight driver to adjust a white tone of the picture displayed on the LCD panel according to a second control signal from the user input unit.

5. The LCD apparatus according to claim 3, wherein the video signal is an NTSC format, a PAL format, or a SECAM format.

6. The LCD apparatus according to claim 1, further comprising a user input unit which generates a first control signal when operated by a user,

wherein the controller controls the backlight driver to adjust the white balance of the picture displayed on the LCD panel according to the first control signal from the user input unit.

7. The LCD apparatus according to claim 6, wherein the controller controls the backlight driver to adjust a white tone of the picture displayed on the LCD panel according to a second control signal from the user input unit.

8. The LCD apparatus according to claim 3, wherein the video signal is an NTSC format, a PAL format, or a SECAM format.

9. The LCD apparatus according to claim 6, wherein the video signal is an NTSC format, a PAL format, or a SECAM format.

10. The LCD apparatus according to claim 1, wherein the plurality of light emitting devices are arranged to have a predetermined pattern.