Patent ID: 8717273

Claim:
A memory-type liquid crystal display device, comprising: a liquid crystal panel including memory circuits, the liquid crystal panel being configured to conduct a refresh operation more than once during a display holding period after rewriting of a screen; wherein at least one of (i) a frequency at which the screen is rewritten and (ii) a frequency at which a refresh operation is conducted during the display holding period, is increased as an intensity of light received by the liquid crystal panel increases; wherein the liquid crystal panel includes gate lines, source lines, transfer lines, refresh lines, retention capacitor lines, main transistors, pixels, and memory circuits for respective pixels; wherein each of the main transistors has a control terminal connected to a corresponding one of the gate lines, and each of the pixels include a pixel electrode and a counter electrode; wherein each of the memory circuits includes (i) a transfer transistor having a control terminal connected to a corresponding one of the transfer lines, (ii) a refresh transistor having a control terminal connected to a corresponding one of the refresh lines, (iii) a memory electrode, and (iv) a relay transistor having a control terminal connected to the memory electrode; wherein a first capacitor is defined by a corresponding one of the retention capacitor lines and a corresponding one of the pixel electrodes, and a second capacitor is defined by the corresponding one of the retention capacitor lines and a corresponding one of the memory electrodes; and wherein each of the pixel electrodes is connected to (i) a corresponding one of the source lines via a corresponding one of the main transistors, (ii) the corresponding one of the memory electrodes via a corresponding one of the transfer transistors, and (iii) the corresponding one of the transfer lines via a corresponding one of the refresh transistors and a corresponding one of the relay transistors.