LIQUID CRYSTAL DISPLAY APPARATUS
A display apparatus having an LCD panel and an LED backlight panel performs display, which includes a display area brightness calculation section which calculates brightness of each of a plurality of display areas based on the image data; a brightness sensor provided in each of a plurality of backlight areas to detect emitted light brightness of the plurality of backlight areas; a controller for adjusting the brightness of each of the backlight areas, based on the display area brightness and the emitted light brightness in each of the backlight areas; and an LED driver for driving each of the LEDs of the backlight panel.
1 . A liquid crystal display apparatus which includes a liquid crystal display panel and a backlight panel having LEDs (light emitting diodes) lighting the liquid crystal panel from the back face thereof, and performs display based on image data, the liquid crystal display apparatus comprising:
a display area brightness calculation section which divides the liquid crystal panel into a plurality of display areas, and calculates a display area brightness for each of the plurality of display areas, based on the image data;
an emitted light brightness sensor which is provided in each of a plurality of backlight areas set in the backlight panel, and detects emitted light brightness for each of the backlight areas;
a light adjustment controller for adjusting the brightness of each of the backlight areas, based on the display area brightness and the emitted light brightness in each of the backlight areas; and
an LED driver for driving each of the LEDs of the backlight panel.
2 . A liquid crystal display apparatus according to claim 1 , wherein the light adjustment controller calculates the display area brightness based on pixel data for each of the frames of the image data.
3 . A liquid crystal display apparatus according to claim 1 , wherein the backlight panel is comprised of a plurality of light sources, each one of which is comprised of red, green and blue (RGB) LEDs in the inside of the lighting face.
4 . A liquid crystal display apparatus according to claim 1 , wherein the emitted light sensor comprises a temperature sensor and a light sensor.
5 . A liquid crystal display apparatus according to claim 1 , wherein the LED driver for driving the LED has a nonvolatile memory, and stores the measured values of the temperature sensor and light sensor, and changes over time of the measured values.
6 . A liquid crystal display apparatus according to claim 3 , wherein the light adjustment controller performs individual luminance control of each of the red, green and blue (RGB) LEDs.
7 . A liquid crystal display apparatus according to claim 3 , wherein the light adjustment controller calculates a brightness change between frames to perform brightness adjustment in accordance with the brightness change.
8 . A liquid crystal display apparatus according to claim 1 , further comprising a distribution detector which calculates brightness distribution of the backlight panel on the basis of detected emitted light brightness for each of the backlight areas, wherein the light adjustment controller adjust the brightness of each of the backlight areas on the basis of the brightness distribution.
9 . A liquid crystal display apparatus according to claim 5 , further comprising a command input section to receive a command input, wherein the distribution detector performs calculation of the brightness distribution in response to the command input.
10 . A liquid crystal display apparatus according to claim 5 , wherein the light adjustment controller performs brightness control of each of the backlight areas based on the changes over time of the measured values.