Lcd with adaptive overdrive
AssigneeTPO Displays Corp.
InventorNaoki Sumi
Life of this patent
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Abstract
A LCD device includes a LCD module, a thermal sensor, an operating device and a frame memory. The operating device includes first and second comparators, one-dimensional first to fourth lookup tables and an operator. The LCD device further includes a selector/data-generator which differentially generates an overdrive output and a prediction output according to outputs of the first comparator, the second comparator and the operator, depending on one of four conditions including a first condition that a start level and an end level are consistent; a second condition that a level of the output of the operator is greater than a predefined maximum; a third condition that the level is less than a predefined minimum; and a fourth condition that the level lies between the predefined maximum and the predefined minimum.
Claims6
A liquid crystal display (LCD) device, comprising:
- a LCD module;
- a thermal sensor, disposed in the display module;
- an operating device calculating and outputting an overdrive voltage and a predicted value of a sub-frame of the LCD module according to a start level and an end level of an image data;
- and
- a frame memory storing the predicted value as the start level which is then outputted to the operating device;
- wherein the operating device comprises:
- a first comparator for determining whether the start level and the end level are consistent or not;
- a first lookup table being one-dimensional and showing the relationship between levels and normalized offsets which are used for standardizing curves associated with squares of voltages corresponding to the levels;
- a second lookup table being one-dimensional and showing the relationship between levels and squares of voltages corresponding to the levels;
- an operator for obtaining an intermediate output value for overdrive, which correlates to a specified square of voltage, by referring to the start level, the end level, and values of the first and second lookup tables;
- a second comparator for determining whether an output of the operator is greater than a predefined maximum, is less than a predefined minimum, or is an intermediate value;
- a third lookup table being one-dimensional and used for calculating an overdrive value to be referred to according to outputs of the first and second comparators;
- and
- a fourth lookup table being one-dimensional and used for calculating a predicted value to be referred to according to the outputs of the first and second comparator;
- and
- wherein the first to fourth lookup tables are dynamically updated in response to a value outputted by the thermal sensor;
- and
- the LCD device being characterized in comprising a selector/data-generator which differentially generates an overdrive output and a prediction output according to the outputs of the first comparator, the second comparator and the operator, depending on one of four conditions including:
- a first condition that the start level and the end level are consistent;
- a second condition that the intermediate output value for overdrive is greater than the predefined maximum;
- a third condition that the intermediate output value for overdrive is less than the predefined minimum;
- and
- a fourth condition that the intermediate output value for overdrive lies between the predefined maximum and the predefined minimum.
Dependencies are inferred from the claim text.