Liquid crystal display device and electronic device equipped with the same
A technology of liquid crystal display and equipment, which is applied in the field of electronic equipment equipped with the liquid crystal display equipment, and can solve the problems of semi-transmissive liquid crystal display equipment, such as uncertain visibility, dark display, and not always selecting the optimal display mode, etc.
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no. 1 example
[0026] The configuration of the liquid crystal display device of the first embodiment of the present invention will be described below.
[0027] As shown in FIG. 1, the liquid crystal display device of this embodiment (hereinafter referred to as "LCD device") has a transmissive liquid crystal panel 1 for display. Furthermore, the LCD device includes a backlight unit 3 for illuminating the transmissive liquid crystal panel 1 from the back, and an optical sheet 6 as a polarizing plate. The backlight unit 3 includes a light guide plate 4 and LEDs 5 . Furthermore, a display switching liquid crystal panel 2 for switching display modes is provided between the transmissive liquid crystal panel 1 and the backlight unit 3 . The display switching liquid crystal panel 2 is configured of liquid crystals, polarizing plates, and optical sheets so that it functions as a transmissive panel when a voltage is not applied thereto, and as a reflective mirror when a voltage is applied thereto.
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no. 3 example
[0066] Such as Figure 8 As shown, the LCD device of the third embodiment includes, in addition to the configuration of the second embodiment, a storage unit 10 for storing a data table in which the received light amount value measured by the illuminance measuring unit 11 is Pre-correlated with the backlight brightness value. However, the means for actually determining the brightness of the backlight unit 3 is not limited.
[0067] For example, the comparison unit 15 may determine the backlight luminance value with reference to the received light amount measured by the illuminance measurement unit 11 and a data table stored in the storage unit 10, and the backlight control unit 13 may control the backlight unit 3 so that it has the determined luminance value .
[0068] Alternatively, the backlight control unit 13 may determine the brightness value of the backlight unit 3 based on the received light amount measured by the illuminance measurement unit 11 and the data table sto...
no. 4 example
[0075] The LCD device described in the foregoing embodiments can be applied to any electronic device equipped with an LCD device, including portable devices such as cellular phones and PDAs, for the following reasons. Electronic equipment can be used in any environment from indoors to outdoors, and the illuminance around it is not always constant. In addition, even if the light source is used indoors, its illuminance is not always constant. Therefore, manual or automatic selection of a transmissive display mode or a reflective display mode according to external illuminance is effective for improving visibility and reducing power consumption.
[0076] Figure 10 The block diagram of FIG. 1 illustrates an embodiment of an electronic device equipped with an LCD device. The electronic device 16 of this embodiment includes: an input unit 17 for key input, etc.; an output unit 18 for outputting voice, etc.; a liquid crystal display unit 19 for displaying using liquid crystals; St...
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