| CPC G09G 3/20 (2013.01) [G06T 3/40 (2013.01); G09G 2320/0626 (2013.01); G09G 2340/04 (2013.01)] | 18 Claims |

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1. A wearable device comprising:
display circuitry;
memory storing one or more computer programs; and
one or more processors communicatively coupled to the display circuitry and the memory,
wherein the one or more computer programs include computer-executable instructions that, when executed by the one or more processors individually or collectively, cause the wearable device to:
control the display circuitry to output light having a first brightness value from at least one light source of the display circuitry so as to display a virtual object in an effective display area having a first size,
determine whether or not surrounding illuminance of the wearable device increases while the light having the first brightness value is output,
based on determining that the surrounding illuminance increases, change a size of the effective display area displaying the virtual object from the first size to a second size by switching the at least one light source included in the display circuitry from an ON state to an OFF state, and
control the display circuitry to display the virtual object in the effective display area having the second size.
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