Display Driver Power Supply Circuit With Adjustable Current Mirrors
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Solution Overview
Problem
Existing LED display driving chips face high power consumption due to the fixed ratio of MOS devices in constant-current-source generating circuits, which increases the current I1 and power consumption when a large constant-current-source current Iout is required.
Innovation Solution
A power supply circuit with a reference-current generating circuit, a driver circuit, and a channel-current output circuit, where the mirror ratios of the current are adjustable, allowing for independent control of P-type and N-type field-effect transistors to optimize current output and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the ratio of MOS devices (K:J) is fixed in the constant-current-source generating circuit, then the circuit structure is simple, but the power consumption increases when a large constant-current-source current Iout is required
Solution Approach 1:
The patent introduces adjustable mirror ratios in both the current mirror circuit and channel current output circuit. By making the mirror ratios dynamic and adjustable rather than fixed, the system can optimize current distribution to reduce power consumption while maintaining the required output current Iout. The adjustability allows the circuit to adapt to different operating conditions.
Solution Approach 2:
The patent changes the parameter of mirror ratio from a fixed value to an adjustable parameter. By allowing the mirror ratios (M:N in current mirror circuit and J:K in channel current output circuit) to be adjusted, the system can optimize the current I1 to reduce power consumption while still achieving the required large constant-current-source current Iout when needed.
2Power
If the current I1 is increased to achieve a large constant-current-source current Iout output, then the output current capability is improved, but the power consumption of the chip increases
Solution Approach 1:
The patent makes the mirror ratios dynamic and adjustable, allowing the system to optimize the current I1 based on the required output current Iout. When a large Iout is needed, the adjustable ratios allow I1 to be increased only as much as necessary, rather than requiring I1 to be very large in all cases, thus reducing unnecessary power consumption.
Solution Approach 2:
By changing the mirror ratio parameters from fixed to adjustable, the system can optimize the relationship between I1 and Iout. This allows the current I1 to be minimized while still achieving the required output current capability, thereby reducing power consumption.
3Use of energy by moving object
If the mirror ratios are adjustable in the power supply circuit, then the power consumption is reduced, but the device complexity increases
Solution Approach 1:
The patent introduces adjustable mirror ratios in the current mirror circuit and channel current output circuit. While this adds complexity compared to fixed ratios, it enables significant power consumption reduction by optimizing current distribution. The dynamic adjustability allows the circuit to operate efficiently across different current requirements.
Solution Approach 2:
The patent changes the mirror ratio from a fixed parameter to an adjustable parameter. This parameter change enables the circuit to optimize power consumption by adjusting the current distribution according to actual operating conditions, accepting the trade-off of increased device complexity for significant energy savings.
Data Source
AI summary
A power supply circuit, a driving chip and a display apparatus. The power supply circuit comprises: a reference current generation circuit (101), which is configured to generate a reference current; a driving circuit (302), which is connected to the reference current generation circuit (101) and is configured to generate, according to the reference current, a mirror image current with an adjustable mirror image proportion, and output a bias voltage and a gate driving voltage; and a channel current output circuit (303), which is connected to the driving circuit (302) and is configured to receive the bias voltage and the gate driving voltage, and generate, according to the mirror image current, a channel current with an adjustable mirror image proportion. Since a mirror image proportion is adjustable, the current precision can be improved, and when a relatively large output current is required, a mirror image current can remain relatively small, thereby reducing power consumption.