Temperature adaptive overdrive method, system and apparatus

A system for compensating for temperature variations within a liquid crystal display device, comprising:

• a temperature sensor configured to measure an ambient temperature;
• a memory configured to store a lookup table containing a plurality of overdrive parameters, each overdrive parameter corresponding to a graylevel transition between a previous frame and a current frame and representing a level at which a liquid crystal is driven in order to achieve a response time for the graylevel transition, wherein the overdrive parameters in the lookup table are calibrated at a reference temperature;
• and
• a processor configured to extract an overdrive parameter from the lookup table corresponding to the graylevel transition between the previous frame and the current frame, and further configured to calculate an adapted overdrive parameter that adjusts for the difference between the measured ambient temperature and the reference temperature at which the extracted overdrive parameter is calibrated;
• and
• wherein the processor is further configured to calculate the adapted overdrive parameter ‘MT1(i,j)’ according to the following equation:
• MT1(i,j)=MT0(i,j)+D(i,j)
• where ‘MT0(i,j)’ is the overdrive parameter extracted from the lookup table for the start graylevel ‘i’ and the target graylevel ‘j’, and ‘D(i,j)’ is a compensation parameter to compensate for the difference between the measured ambient temperature and the reference temperature.

In an overdrive module for determining an overdrive parameter to be applied to one or more liquid crystals within a liquid crystal display, a computer program product configured to implement a method of determining the overdrive parameter to compensate for temperature variations, the computer program product comprising one or more non-transitory computer readable media having stored thereon computer executable instructions that, when executed by a processor, cause the overdrive module to perform the following:

• obtain an ambient temperature;
• extract an overdrive parameter from a lookup table containing a plurality of overdrive parameters, each overdrive parameter corresponding to a graylevel transition between a first and a second frame and representing a level at which a liquid crystal is driven in order to achieve a response time for the graylevel transition, wherein the overdrive parameters in the lookup table are calibrated at a reference temperature;
• and
• apply a temperature adaptive algorithm to the overdrive parameter extracted from the lookup table for determining an adapted overdrive parameter, the temperature adaptive algorithm being a function of at least the ambient temperature, the reference temperature, a start graylevel and a target graylevel;
• and
• wherein the temperature adaptive algorithm calculates the adapted overdrive parameter ‘MT1(i,j)’ according to the following equation:
• MT1(i,j)=MT0(i,j)+D(i,j)
• where ‘MT0(i,j)’ is the overdrive parameter extracted from the lookup table for the start graylevel ‘i’ and the target graylevel ‘j’, and ‘D(i,j)’ is a compensation parameter to compensate for the difference between the ambient temperature and the reference temperature.