LIQUID CRYSTAL DISPLAYING DEVICE AND METHOD

• US 20110134159A1
• Filed: 12/03/2010
• Published: 06/09/2011
• Est. Priority Date: 12/04/2009
• Status: Active Grant

• Current Assignee: ATRC Corporation, Mitsumi Electric Co., Ltd. (Minebea Mitsumi, Inc.)
• Original Assignee: ATRC Corporation, Mitsumi Electric Co., Ltd. (Minebea Mitsumi, Inc.)
• Inventors: ADACHI, TAKESHI
• Granted Patent: US 8,508,560 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix

Abstract

A disclosed liquid crystal displaying device having a liquid crystal displaying unit and a backlight unit includes a signal processing unit dividing an input signal into plural blocks in conformity with a predetermined number of dividing a screen of the backlight unit, a high frequency component acquiring unit acquiring high frequency components for the blocks; a signal component analyzing unit analyzing signal components of the input signal for the blocks, a low frequency component acquiring unit acquiring low frequency components for the blocks, a backlight driving signal generating unit generating a backlight driving signal based on signals acquired by the signal component analyzing unit and the low frequency component acquiring unit, an inverter inverting the backlight driving signal, and a synthesizing unit acquiring a synthesized signal displayed by the liquid crystal displaying unit based on the input signal, the high frequency components, and the inverted driving signal.

Claims

1. A liquid crystal displaying device having a liquid crystal displaying unit and a backlight unit for emitting a light into a back surface of the liquid crystal displaying unit, the liquid crystal displaying device comprising:

a signal processing unit configured to divide an input signal into a plurality of blocks in conformity with a predetermined number of dividing a screen of the backlight unit;

a high frequency component acquiring unit configured to acquire high frequency components for each of the plurality of blocks;

a signal component analyzing unit configured to analyze signal components of the input signal for each of the plurality of blocks;

a low frequency component acquiring unit configured to acquire low frequency components for each of the plurality of blocks;

a backlight driving signal generating unit configured to generate a backlight driving signal for the backlight unit based on signals acquired by the signal component analyzing unit and the low frequency component acquiring unit;

an inverter configured to invert the backlight driving signal acquired by the backlight driving signal generating unit; and

a synthesizing unit configured to acquire a synthesized signal displayed by the liquid crystal displaying unit based on the input signal, the high frequency components acquired by the high frequency component acquiring unit, and an inverted driving signal acquired by the inverter.

2. The liquid crystal displaying device according to claim 1,

wherein the low frequency component acquiring unit includes a first level adjusting unit configured to adjust an acquired frequency level.

3. The liquid crystal displaying device according to claim 1,

wherein the inverter includes a second level adjusting unit configured to adjust an inverting level of the backlight driving signal.

4. The liquid crystal displaying device according to claim 1,

wherein the signal component analyzing unit detects the signal components of the input signal on the screen in its entirety, and

the backlight driving signal generating unit generates the backlight driving signal of the backlight unit using a control signal acquired by synthesizing a reference voltage corresponding to the signal component detected by the signal component analyzing unit with the low frequency components acquired by the low frequency component acquiring unit.

5. The liquid crystal displaying device according to claim 1,

wherein the synthesizing unit synthesizes the inverted driving signal with the high frequency components to provide a correction signal for the backlight.

6. The liquid crystal displaying device according to claim 5,

wherein the synthesizing unit causes the correction signal to be associated with the backlight driving signal, controlled to match levels of the correction signal and the driving signal, and superposed on the input signal.

7. A liquid crystal displaying method used in a liquid crystal displaying device having a liquid crystal displaying unit and a backlight unit for emitting a light into a back surface of the liquid crystal displaying unit, the liquid crystal displaying method comprising:

dividing an input signal into a plurality of blocks in conformity with a predetermined number of dividing a screen of the backlight unit;

acquiring high frequency components for each of the plurality of blocks;

analyzing signal components of the input signal for each of the plurality of blocks;

acquiring low frequency components for each of the plurality of blocks;

generating a backlight driving signal for the backlight unit based on signals acquired by the analyzing the signal components and the acquiring the low frequency components;

inverting the backlight driving signal acquired by the generating the backlight driving signal; and

acquiring a synthesized signal displayed by the liquid crystal displaying unit based on the input signal, the high frequency components acquired by the acquiring the high frequency components, and an inverted driving signal acquired by the inverting the backlight driving signal.

8. The liquid crystal displaying method according to claim 7,

wherein the acquiring of low frequency components includes adjusting a first level for adjusting an acquired frequency level.

9. The liquid crystal displaying method according to claim 7,

wherein the inverting of the backlight driving signal includes adjusting a second level for adjusting an inverting level of the backlight driving signal.

10. The liquid crystal displaying method according to claim 7,

wherein the analyzing of the signal components includes detecting the signal components of the input signal on the screen in its entirety, and

the generating of the backlight driving signal includes generating the backlight driving signal of the backlight unit using a control signal acquired by synthesizing a reference voltage corresponding to the signal component detected by the analyzing the signal component with the low frequency components acquired by the acquiring the low frequency components.

11. The liquid crystal displaying method according to claim 7,

wherein the acquiring of the synthesized signal synthesizes the inverted driving signal with the high frequency components to provide a correction signal for the backlight.

12. The liquid crystal displaying method according to claim 11,

wherein the acquiring of the synthesized signal includes causing the correction signal to be associated with the backlight driving signal, controlled to match levels of the correction signal and the driving signal, and superposed on the input signal.