Backlight unit and liquid crystal display device
A technology of backlight unit and light detection, which is applied in the direction of lighting devices, optics, light sources, etc., and can solve the problems of computing circuit consumption, low power consumption, high power, etc.
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example 1
[0036] Hereinafter, in order to describe the above-mentioned embodiment in detail, refer to Figures 1 to 4 , a description will be given here of the backlight unit according to Example 1 and the liquid crystal display device equipped with the backlight unit. figure 1 and Figure 4 Each is a block diagram showing the structure of the liquid crystal display device (in particular, the backlight unit) of this example. figure 2 is a schematic diagram showing the relationship between the spectrum and the photometric function curve of R-LED, G-LED, B-LED and W-LED. image 3 is a schematic diagram showing an example of the spectral characteristics of an RGB color sensor.
[0037] Such as figure 1 As shown, the liquid crystal display device of this example is composed of a liquid crystal display panel 1 and a backlight unit, and the backlight unit includes a sensor-based feedback control system. The backlight unit is composed of an LED backlight 10 , a control unit 20 and a drive...
example 2
[0063] Next, refer to Figure 5 and Figure 6 A backlight unit according to Example 2 and a liquid crystal display device equipped with the backlight unit are described. Figure 5 is a block diagram showing the configuration of the liquid crystal display device (in particular, the backlight unit) of this example. Figure 6 is a schematic diagram showing the effect of reducing power consumption brought about by long-term control of the backlight unit according to Example 1 and Example 2.
[0064] In the above-mentioned Example 1, the W-LED 14 and the G-LED 12 are assumed to be one type of LEDs that emit light under the same driving conditions. Alternatively, the W-LED 14 and the R-LED 11 may be controlled on the assumption that they are a kind of LED that emit light under the same driving conditions. In this case, Expression (4) of Example 1 can be changed to Expression (5).
[0065]
[0066] Based on the expression (5), the control section 20 sends the control signal (d...
example 3
[0072] Next, a backlight unit and a liquid crystal display device equipped with the backlight unit according to a third example will be described.
[0073] In Example 1 and Example 2 above, the control section 20 pairs any one of W and RGB colors, and outputs a common control signal for LEDs having the paired color. However, such paired colors may be selected from any two colors of any color other than W. As mentioned above, depending on the desired color temperature of the white point, the paired colors of this example also allow for effective chromaticity adjustment over time. In this case, the paired colors can be chosen arbitrarily as long as they are not white.
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