BATTERY STATE MONITORING DEVICE AND ELECTRONIC DEVICE FITTED WITH SUCH DEVICE
First Claim
1. A battery state monitoring device for monitoring terminal voltage of a battery for supplying electrical power to display means for displaying an image, comprising:
- voltage detection means for detecting terminal voltage of the battery;
comparison means for comparing the detected terminal voltage and a threshold voltage;
detection means for detecting luminance level of the image displayed in the display means; and
adjustment means for adjusting the threshold voltage or the detected terminal voltage according to the luminance level, wherein the battery terminal voltage is monitored using comparison by the comparison means.
2 Assignments
0 Petitions
Accused Products
Abstract
In an electronic device that uses a self-emissive display such as an organic EL display, terminal voltage of a battery is monitored with high precision.
In a digital camera 10, an organic EL display 26 is driven by a battery 12. The terminal voltage of the battery 12 is detected and a CPU 20 compares the detected terminal voltage with a threshold voltage to determine whether or not a fully discharged state has been reached. The luminance level of an image for the next frame stored in a VRAM 24 is detected, and the threshold value is dynamically changed according to the luminance level.
7 Citations
14 Claims
-
1. A battery state monitoring device for monitoring terminal voltage of a battery for supplying electrical power to display means for displaying an image, comprising:
-
voltage detection means for detecting terminal voltage of the battery;
comparison means for comparing the detected terminal voltage and a threshold voltage;
detection means for detecting luminance level of the image displayed in the display means; and
adjustment means for adjusting the threshold voltage or the detected terminal voltage according to the luminance level, wherein the battery terminal voltage is monitored using comparison by the comparison means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11, 12)
-
-
9. A battery state monitoring device, for monitoring terminal voltage of a battery for supplying electrical power to a self-emissive display for displaying an image, comprising:
-
voltage detection means for detecting terminal voltage of the battery;
first arithmetic means for detecting operation or non-operation of each functional block inside a device driven by the battery to calculate a first consumed electrical current when the battery drives each functional block;
second arithmetic means for calculating a second consumed electrical current when the self-emissive display is driven by detecting an average luminance level of an image displayed by the self-emissive display;
third arithmetic means for calculating a threshold voltage in order to monitor terminal voltage of the battery based on the first consumed electrical current and the second consumed electrical current, or correcting detected terminal voltage; and
fourth arithmetic means for comparing detected terminal voltage and the threshold voltage and outputting a result. - View Dependent Claims (10, 13, 14)
-
Specification