Display apparatus and method of driving the same

• US 8,704,861 B2
• Filed: 01/31/2013
• Issued: 04/22/2014
• Est. Priority Date: 03/25/2009
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Amino, Tadashi
• Primary Examiner(s): Lamb, Christopher R
• Application Number:
  US13/756,277
• Publication Number:
  US 20130141478A1
• Time in Patent Office: 446 Days
• Field of Search: None
• US Class Current: 345/690
• CPC Class Codes: G09G 2320/0238 Improving the black level
• CPC Class Codes: G09G 2320/0271 Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/106 Determination of movement vectors or equivalent parameters within the image
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 2360/18 Use of a frame buffer in a display terminal, inclusive of the display panel
• CPC Class Codes: G09G 3/2092 Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165
• 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
• CPC Class Codes: G09G 5/10 Intensity circuits

Abstract

Disclosed are a display apparatus and a method of driving the same. An image signal receiver sequentially outputs frames for image display. A local illumination calculation unit displays an image on a display unit based on the frames and calculates light emission amount of a light source provided for each section of a backlight unit. A frame interpolator generates sub-frames based on the frames and outputs the sub-frames and the frames. A pixel adjuster adjusts light transmittance of each pixel according to the brightness of each pixel and the amount of the light emitted from each section which is calculated by the local illumination calculation unit when the image is displayed based on the frames and the sub-frames sequentially output from a frame interpolator. Local illumination is realized without increasing the number of memory devices while a frame frequency is increased.

Claims

1. A display apparatus, comprising:

a backlight unit having a plurality of sections each generating a light;

a display unit having a plurality of pixels allowing the light to pass therethrough;

an image signal receiver receiving an image signal having a plurality of consecutive frames to sequentially output the frames;

a frame interpolator generating at least one (n+1)-th sub-frame (n is an integer larger than

     1) by applying, to an (n+1)-th frame, a difference value between an n-th frame and the (n+1)-th frame, and sequentially outputting the (n+1)-th frame and the (n+1)-th sub-frame, wherein the n-th frame corresponds to a former frame and the (n+1)-th frame corresponds to a latter frame;

a local illumination calculation unit calculating a target light amount generated from the sections based on a brightness of the (n+1)-th frame; and

a backlight controller controlling the backlight unit to generate the target amount of the light from the sections while the (n+1)-th frame and the (n+1)-th sub-frame are being displayed.

2. The display apparatus of claim 1, further comprising a pixel adjuster adjusting a light transmittance of the pixels of each of the (n+1)-th frame and the (n+1)-th sub-frame according to a pixel brightness of each of the(n+1)-th frame and the (n+1)-th sub-frame and the target light amount calculated based on the (n+1)-th frame.

3. The display apparatus of claim 1, wherein the frame interpolator is configured to minimize the difference value and apply the minimized difference value to the (n+1)-th frame, so as to generate the (n+1)-th sub-frame.

4. The display apparatus of claim 1, wherein the difference value is calculated based on a difference between RGB values or a difference between at least one of luminance, contrast, and color values.