Liquid crystal display device, electronic device, and driving methods thereof
First Claim
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1. A liquid crystal display device comprising:
- a light source for monitor use;
a liquid crystal layer;
a backlight for emitting light to the liquid crystal layer;
a light sensor used to detect an intensity of light passing through the liquid crystal layer from the light source for monitor use;
a unit configured to determine a timing of the backlight to be turned on or a timing of the backlight to be turned off based on successive comparisons in a single frame period between a luminance threshold value and the intensity of light from the light source for monitor use that is detected by the light sensor; and
a unit configured to control the backlight based on the timing of the backlight to be turned on or on the timing of the backlight to be turned off that is determined,wherein the liquid crystal display device is configured so that the backlight is turned on once per frame period or turned off once per frame period according to the timing that is determined.
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Abstract
An object of the present invention is to provide a driving method by which excellent image quality and high video performance can be obtained as well as liquid crystal display devices and electronic devices with excellent image quality and high video performance. A pixel for monitor use is provided in a liquid crystal display device, and luminance of the pixel is detected using a light sensor. Herewith, because changes in luminance of a backlight with changes in the environment and the amount of time it takes for response of the liquid crystal become able to be calculated, control of the backlight in real time using the calculated information can be performed.
53 Citations
24 Claims
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1. A liquid crystal display device comprising:
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a light source for monitor use; a liquid crystal layer; a backlight for emitting light to the liquid crystal layer; a light sensor used to detect an intensity of light passing through the liquid crystal layer from the light source for monitor use; a unit configured to determine a timing of the backlight to be turned on or a timing of the backlight to be turned off based on successive comparisons in a single frame period between a luminance threshold value and the intensity of light from the light source for monitor use that is detected by the light sensor; and a unit configured to control the backlight based on the timing of the backlight to be turned on or on the timing of the backlight to be turned off that is determined, wherein the liquid crystal display device is configured so that the backlight is turned on once per frame period or turned off once per frame period according to the timing that is determined. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 16)
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10. A liquid crystal display device comprising:
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a liquid crystal layer; a first polarizing plate and a second polarizing plate, the liquid crystal layer being sandwiched between the first polarizing plate and the second polarizing plate; a light source for monitor use provided on a side of the first polarizing plate; a backlight for emitting light to the liquid crystal layer; a light sensor used to detect an intensity of light passing through the liquid crystal layer, the first polarizing plate, and the second polarizing plate from the light source for monitor use; a unit configured to determine a timing of the backlight to be turned on or a timing of the backlight to be turned off based on successive comparisons in a single frame period between a luminance threshold value and the intensity of light from the light source for monitor use that is detected by the light sensor; and a unit configured to control the backlight based on the timing of the backlight to be turned on or on the timing of the backlight to be turned off that is determined, wherein the liquid crystal display device is configured so that the backlight is turned on once per frame period or turned off once per frame period according to the timing that is determined. - View Dependent Claims (11, 12, 13, 14, 15, 17, 18)
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19. A driving method for a liquid crystal display device comprising:
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detecting an intensity of light passing through a liquid crystal layer from a light source for monitor use; and controlling a backlight to be turned on or to be turned off based on successive comparisons in a single frame period between a luminance threshold value and the intensity of light from the light source for monitor use that is detected, wherein the backlight is turned on once per frame period or turned off once per frame period according to the intensity of light that is detected, wherein controlling the backlight is performed based on timing of the backlight to be turned on and on timing of the backlight to be turned off, and wherein the timing of the backlight to be turned on and the timing of the backlight to be turned off are calculated based on the intensity of light from the light source for monitor use that is detected. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification