METHOD FOR DRIVING LIQUID CRYSTAL DISPLAY DEVICE

• US 20080284768A1
• Filed: 05/15/2008
• Published: 11/20/2008
• Est. Priority Date: 05/18/2007
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kimura, Hajime, Yoshida, Yasunori
• Granted Patent: US 8,907,879 B2
• Time in Patent Office: Days
• US Class Current: 345/208
• CPC Class Codes: G02F 1/1362 Active matrix addressed cells G02F1/134336, G02F1/134363 take precedence
• CPC Class Codes: G09G 2300/02 Composition of display devices
• CPC Class Codes: G09G 2300/0408 Integration of the drivers onto the display substrate
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• 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 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2300/0876 Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 2310/0262 The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2320/028 by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
• CPC Class Codes: G09G 2320/0633 by amplitude modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/106 Determination of movement vectors or equivalent parameters within the image
• CPC Class Codes: G09G 2330/021 : Power management, e.g. power saving
• CPC Class Codes: G09G 2340/0435 : Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 2340/16 : Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 2360/144 : the light being ambient light
• CPC Class Codes: G09G 2360/16 : Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2018 : by time modulation using two or more time intervals
• CPC Class Codes: G09G 3/2022 : using sub-frames
• CPC Class Codes: G09G 3/2025 : the sub-frames having all the same time duration
• CPC Class Codes: G09G 3/2081 : with combination of amplitude modulation and time modulation space and time error diffusion G09G3/2066
• CPC Class Codes: G09G 3/3233 : with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3406 : Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/342 : using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
• CPC Class Codes: G09G 3/3648 : using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3659 : the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
• CPC Class Codes: G09G 5/005 : Adapting incoming signals to the display format of the display terminal
• CPC Class Codes: H01L 27/1214 : comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• CPC Class Codes: H01L 27/1266 : the substrate on which the devices are formed not being the final device substrate, e.g. using a temporary substrate
• CPC Class Codes: H01L 29/42384 : for thin film field effect transistors, e.g. characterised by the thickness or the shape of the insulator or the dimensions, the shape or the lay-out of the conductor
• CPC Class Codes: H01L 29/66772 : Monocristalline silicon transistors on insulating substrates, e.g. quartz substrates H01L29/66666 takes precedence; thin film FinFETs H01L29/66795
• CPC Class Codes: H10K 50/11 : characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 59/12 : Active-matrix OLED [AMOLED] displays

Abstract

In a period T_in, p-th input image data (p is a positive integer) and (p+1)th input image data are input to a liquid crystal display device. In a period T, i-th original image data (i is a positive integer) and (i+1)th original image data are generated based on the input image data. J number of sub-images (J is an integer equal to or more than 3) are generated based on the i-th original image data. In the period T, the J number of sub-images are sequentially displayed. At least one of the i-th original image data and the (i+1)th original image data is in an intermediate state between the p-th input image data and the (p+1)th input image data. Each of the sub-images exhibits one of first brightness and second brightness. At least one sub-image among the J number of sub-images is different from the other sub-images.

Claims

1. A method for driving a liquid crystal display device, comprising the steps of:

inputting p-th input image data and (p+1)th input image data to the liquid crystal display device at intervals of a period T_in, wherein p is a positive integer;

generating i-th original image data and (i+1)th original image data based on the input image data in a period T, wherein i is a positive integer;

generating J number of sub-images based on the i-th original image data, wherein J is an integer equal to or more than 3; and

displaying the J number of sub-images sequentially in the period T,

wherein at least one of the i-th original image data and the (i+1)th original image data is in an intermediate state between the p-th input image data and the (p+1)th input image data,

at least one of the sub-images exhibits a first brightness and other one of the sub-images exhibits a second brightness, and

all of the J number of sub-images are the same images.

2. The method for driving the liquid crystal display device according to claim 1, wherein at least one of the J number of sub-images is a black image.

3. A method for driving a liquid crystal display device, comprising the steps of:

inputting p-th input image data and (p+1)th input image data to the liquid crystal display device at intervals of a period T_in, wherein p is a positive integer;

generating i-th original image data and (i+1)th original image data based on the input image data in a period T, wherein i is a positive integer;

generating a first sub-image and a second sub-image based on the i-th original image data; and

displaying the first sub-image and the second sub-image sequentially in the period T,

wherein at least one of the i-th original image data and the (i+1)th original image data is in an intermediate state between the p-th input image data and the (p+1)th input image data,

the period T_in is more than twice the period T, and

the first sub-image and the second sub-image are the same images.

4. The method for driving the liquid crystal display device according to claim 3, wherein the first sub-image or the second sub-image is a black image.

5. A method for driving a liquid crystal display device, comprising the steps of:

inputting p-th input image data and (p+1)th input image data to the liquid crystal display device at intervals of a period T_in, wherein p is a positive integer; and

generating i-th original image data and (i+1)th original image data based on the input image data in the period T_in, wherein i is a positive integer,

wherein at least one of the original image data in the period T_in exhibits a first brightness and other one of the original image data in the period T_in exhibits a second brightness.

6. The method for driving the liquid crystal display device according to claim 5, wherein at least one of the original image data is a black image.