Source: http://www.freshpatents.com/-dt20101223ptan20100321414.php
Timestamp: 2013-06-20 12:13:14
Document Index: 762132016

Matched Legal Cases: ['art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 24', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 24', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 24', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art 23', 'art) 23']

Display Device n/a views for this patent on FreshPatents.comupdated 06/14/13
Display device Abstract: It is an object of the present invention to provide a display device that can improve the color reproductivity on a displayed image and improve the display quality. A liquid crystal display device (1) is provided with a backlight device (3) and a liquid crystal panel (2) configured to have capability of color display of information by using illumination light from the backlight device (3). The backlight device (3) has a plurality of illumination areas (Ha) with respect to a plurality of display areas provided on the liquid crystal panel (2), and light-emitting diodes (light sources) of RGB (8r, 8g, 8b) mixable with white light are provided for each illumination area (Ha). Its control part is provided with a backlight control part that determines for each of the light sources a luminance value of light emitted from each of the plural illumination areas (Ha) to a corresponding display area by using an inputted picture signal and that controls the drive of a backlight part, so that an area active backlight drive is carried out. The light-emitting diodes (light sources) of RGB (8r, 8g, 8b) have offset luminances that are set independently from each other. ...
USPTO Applicaton #: #20100321414 - Class: 345690 (USPTO) - 12/23/10 - Class 345 Related Terms: Backlight Control The Patent Description & Claims data below is from USPTO Patent Application 20100321414, Display device.
20100321414
2007-251980
PCT/JP2008/067417
DESCRIPTION OF THE INVENTION Hereinafter, the embodiments of the present invention will be specified with reference to the attached drawings. The description below refers to a case where the present invention is applied to a transmission type liquid crystal display device. It should be noted that the dimensions of the components in each of the drawings do not necessarily indicate the actual dimensions of the components and dimensional ratios among the respective components and the like.
Embodiment 1 FIG. 1 is a diagram illustrating a schematic configuration of a liquid crystal display device according to Embodiment 1 of the present invention. In the drawing, a liquid crystal display device 1 of the present embodiment is provided with a liquid crystal panel 2 as a display part to be disposed with its upper surface as the visible side (display surface) and a backlight device 3 as a backlight part that is placed on the non-display surface of the liquid crystal panel 2 (i.e., the lower side in the drawing) and that emits light for illuminating the liquid crystal panel 2. Further in the present embodiment, the liquid crystal panel 2 and the backlight device 3 are contained integrally as a transmission type liquid crystal display device 1 inside a package 4. Further in the liquid crystal display device 1 of the present embodiment, a control part that controls drive of the liquid crystal panel 2 and drive of the backlight device 3 by using a picture signal inputted from the exterior is provided (the details will be stated below).
Namely, the offset computing part 23 acquires values of 50% and 10% stored respectively on a memory (not shown) as correction coefficients for the light-emitting diodes 8g, 8b. And the offset computing part 23 calculates a value obtained by multiplying the luminance signal value of the light-emitting diode 8r by 50% as the weighted luminance signal value (G-LED(calc)) of the light-emitting diode 8g, and also calculates a value obtained by multiplying the luminance signal value of the light-emitting diode 8r by 10% as the weighted luminance signal value (B-LED(calc)) of the light-emitting diode 8b. In the above-described step S4, when it is decided that the luminance signal value of the light-emitting diode 8g is equal to or larger than the luminance signal value of the light-emitting diode 8r and larger than the luminance signal value of the light-emitting diode 8b, the offset computing part 23 executes a weighting process using a predetermined correction coefficient so as to calculate the respective weighted luminance signal values of the light-emitting diodes 8r, 8b (step S7).
Namely, the offset computing part 23 acquires values of 50% and 75% stored respectively on the memory as correction coefficients for the light-emitting diodes 8r, 8b. And the offset computing part 23 calculates a value obtained by multiplying the luminance signal value of the light-emitting diode 8g by 50% as the weighted luminance signal value (R-LED(calc)) of the light-emitting diode 8r, and also calculates a value obtained by multiplying the luminance signal value of the light-emitting diode 8g by 75% as the weighted luminance signal value (B-LED(calc)) of the light-emitting diode 8b. In the above-described step S5, when it is decided that the luminance signal value of the light-emitting diode 8b is equal to or larger than the luminance signal value of the light-emitting diode 8g and larger than the luminance signal value of the light-emitting diode 8r, the offset computing part 23 executes a weighting process using a predetermined correction coefficient so as to calculate the respective weighted luminance signal values of the light-emitting diodes 8r, 8g (step S8).
Namely, the offset computing part 23 acquires values of 10% and 75% stored respectively on the memory as correction coefficients for the light-emitting diodes 8r, 8g. And the offset computing part 23 calculates a value obtained by multiplying the luminance signal value of the light-emitting diode 8b by 10% as the weighted luminance signal value (R-LED(calc)) of the light-emitting diode 8r, and also calculates a value obtained by multiplying the luminance signal value of the light-emitting diode 8b by 75% as the weighted luminance signal value (G-LED(calc)) of the light-emitting diode 8g. As described above, in the steps S6-S8, weighting processes are carried out by adding up the predetermined correction coefficient with respect to the offset values of the light-emitting diodes 8r, 8g, 8b as determined respectively in the step S1. The correction coefficients are determined previously by using the predetermined CF property of the color filter 2d and the predetermined luminescence property of the light-emitting diodes 8r, 8g, 8b. Specifically, the respective correction coefficients are determined by driving the commercialized liquid crystal display device 1 for performing subjective evaluations and measurement so that the influences of color displacement of the displayed image are suppressed and a vivid image is displayed in comparison with a case of the monochrome area active drive. Alternatively, the respective correction coefficients can be determined by performing a simulation or the like of the display operation by using the data of the transmission wavelength of the respective color filters of RGB as indicated with curves 60r, 60g, 60b in FIG. 16 and/or the data of the emission wavelengths of the respective light-emitting diodes of RGB as indicated with a curve 50 in FIG. 16.
Next, when any of the processing operations of the above steps S6-S8 ends, the offset computing part 23 compares the respective weighted luminance signal values of the light-emitting diodes 8r, 8g, 8b determined in the steps S6-S8 with the corresponding values of R′max, G′max and B′max obtained in the step S1, thereby decides whether the respective weighted luminance signal values are appropriate or not and determines the respective final luminance signal values of the light-emitting diodes 8r, 8g, 8b. Specifically, when the processing operation in the step S6 ends, the offset computing part 23 executes the G,B-LED decision process (step S9) for deciding whether the respective weighted luminance signal values of the light-emitting diodes 8g, 8b determined in the step S6 are appropriate or not, thereby determines the respective final luminance signal values of the light-emitting diodes 8r, 8g, 8b to be outputted to the LED output data computing part 24.
In the step S13, when the weighted luminance signal value of the light-emitting diode 8g is decided as smaller than the value of G′max, the offset computing part 23 sets the value of G′max as the final luminance signal value of the light-emitting diode 8g. In the step S12, when it is decided that the value of R′max is larger than the value of B′max, the offset computing part 23 carries out the processes of steps S14-S18 so as to determine the respective final luminance signal values of the light-emitting diodes 8g, 8b. And the offset computing part 23 uses the value of R′max for the final luminance signal value of the light-emitting diode 8r. Namely, as shown in the step S14, the offset computing part 23 compares the value of LED luminance signal of the light-emitting diode 8g determined in the step S1 (i.e., G′max) and the luminance signal value of the light-emitting diode 8g which has been weighted in the step S6 (i.e., G-LED(calc)).
In the step S14, when it is decided that the weighted luminance signal value of the light-emitting diode 8g is smaller than the value of G′max, the offset computing part 23 sets the value of G′max as the final luminance signal value of the light-emitting diode 8g. Further, as shown in the step S15, the offset computing part 23 compares the value of LED luminance signal of the light-emitting diode 8b determined in the step S1 (i.e., B′max) and the luminance signal value of the light-emitting diode 8b which has been weighted in the step S6 (i.e., B-LED(calc)).
In the step S15, when it is decided that the weighted luminance signal value of the light-emitting diode 8b is smaller than the value of B′max, the offset computing part 23 sets the value of B′max as the final luminance signal value of the light-emitting diode 8b. Returning to FIG. 9, when the processing operation in the above-mentioned step S7 ends, the offset computing part 23 executes R,B-LED decision process for deciding whether the respective weighted luminance signal values of the light-emitting diodes 8r, 8b determined in the step S7 are appropriate or not (step S10), and determines the respective final luminance signal values of the light-emitting diodes 8r, 8g, 8b to be outputted to the LED output data computing part 24.
In the step S20, when it is decided that the weighted luminance signal value of the light-emitting diode 8b is smaller than the value of B′max, the offset computing part 23 sets the value of B′max as the final luminance signal value of the light-emitting diode 8b. In the step S19, when it is decided that the value of G′max is larger than the value of R′max, the offset computing part 23 carries out the processes of steps S21-S25 so as to determine the respective final luminance signal values of the light-emitting diodes 8b, 8r. And the offset computing part 23 uses the value of G′max as the final luminance signal value of the light-emitting diode 8g. Namely, as shown in step S21, the offset computing part 23 compares the value of LED luminance signal of the light-emitting diode 8b determined in the step S1 (i.e., B′max) and the luminance signal value of the light-emitting diode 8b which has been weighted in the step S7 (i.e., B-LED(calc)).
In the step S21, when it is decided that the weighted luminance signal value of the light-emitting diode 8b is smaller than the value of B′max, the offset computing part 23 sets the value of B′max as the final luminance signal value of the light-emitting diode 8b. Further, as shown in the step S22, the offset computing part 23 compares the value of LED luminance signal of the light-emitting diode 8r determined in the step S1 (i.e., R′max) and the luminance signal value of the light-emitting diode 8r which has been weighted in the step S7 (i.e., R-LED(calc)).
In the step S22, when it is decided that the weighted luminance signal value of the light-emitting diode 8r is smaller than the value of R′max, the offset computing part 23 sets the value of R′max as the final luminance signal value of the light-emitting diode 8r. Returning to FIG. 9, when the processing operation in the above-mentioned step S8 ends, the offset computing part 23 executes R,G-LED decision process for deciding whether the respective weighted luminance signal values of the light-emitting diodes 8r, 8g determined in the step S8 are appropriate or not (step S11), and determines the respective final luminance signal values of the light-emitting diodes 8r, 8g, 8b to be outputted to the LED output data computing part 24.
In the step S27, when it is decided that the weighted luminance signal value of the light-emitting diode 8r is smaller than the value of R′max, the offset computing part 23 sets the value of R′max as the final luminance signal value of the light-emitting diode 8r. In the step S26, when it is decided that the value of B′max is larger than the value of G′max, the offset computing part 23 carries out the processes of steps S28-S32 so as to determine the respective final luminance signal values of the light-emitting diodes 8r, 8g. And the offset computing part 23 uses the value of B′max as the final luminance signal value of the light-emitting diode 8b. Namely, as shown in the step S28, the offset computing part 23 compares the value of LED luminance signal of the light-emitting diode 8r determined in the step S1 (i.e., R′max) and the luminance signal value of the light-emitting diode 8r which has been weighted in the step S8 (i.e., R-LED(calc)).
In the step S28, when it is decided that the weighted luminance signal value of the light-emitting diode 8r is smaller than the value of R′max, the offset computing part 23 sets the value of R′max as the final luminance signal value of the light-emitting diode 8r. Further, as shown in the step S29, the offset computing part 23 compares the value of LED luminance signal of the light-emitting diode 8g determined in the step S1 (i.e., G′max) and the luminance signal value of the light-emitting diode 8g which has been weighted in the step S8 (i.e., G-LED(calc)).
In the step S29, when it is decided that the weighted luminance signal value of the light-emitting diode 8g is smaller than the value of G′max, the offset computing part 23 sets the value of G′max as the final luminance signal value of the light-emitting diode 8g. In the thus configured liquid crystal display device 1 of the present embodiment, light-emitting diodes (light sources) 8r, 8g, 8b of RGB mixable with white light are provided to each of the plural illumination areas Ha. At the light-emitting diodes 8r, 8g, 8b, as indicated as R-LED(calc), G-LED(calc) and B-LED(calc) in the steps S6-S8, the offset luminances are set independently from each other. Thereby, the offset computing part (control part) 23 can control independently the offset luminances for the respective light-emitting diodes 8r, 8g, 8b. Namely, the operations for processing in the steps S6-S32 can be carried out, and in accordance with the inputted picture signals, the luminance values of the respective light-emitting diodes 8r, 8g, 8b can be determined suitably. As a result, unlikely to the conventional technique, the color reproducibility can be improved, and thus the display quality can be improved.
Embodiment 2 FIG. 14 is a block diagram showing a configuration of a backlight data processing part in a liquid crystal display device according to Embodiment 2 of the present invention. In this drawing, a main difference between the present embodiment and Embodiment 1 is that the offset computing part compares a determined luminance value of green and a determined luminance value of blue by using the inputted picture signal, and determines the larger luminance value as the luminance value of green and also as the luminance value of blue. In the following description of embodiment, the same reference numerals may be assigned to the same components as those of Embodiment 1 in order to avoid the duplication of explanations.
INDUSTRIAL APPLICABILITY The present invention is effective for a high-performance display device that can improve color reproducibility on a displayed image and that can improve the display quality.
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