Demultiplexer Circuit Voltage Control for Display Power Reduction
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Solution Overview
Problem
Existing display apparatuses face issues with unstable voltage charging and discharging of control lines, leading to increased power consumption due to the demultiplexer circuits in related art.
Innovation Solution
The display apparatus incorporates a demultiplexer circuit unit that changes the order of data signal distribution to each data line every horizontal period of the scan signal, using switching units and voltage controllers to control and discharge control line voltages based on time division control signals and auxiliary signals, reducing the number of voltage increases and decreases, and implementing RGB-BGR rendering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If demultiplexer circuits are used to reduce the number of channels of the driving IC, then the bezel area is decreased, but the voltage charging and discharging of control lines becomes unstable and power consumption increases
Solution Approach 1:
The patent applies periodic action by time-division multiplexing the control signals for the demultiplexer circuits. Instead of continuously charging and discharging control lines, the control signals are applied periodically in time-division manner, where each control line is activated only when needed for its corresponding data line. This reduces the frequency of voltage transitions and thereby lowers power consumption while maintaining the bezel area reduction benefit.
Solution Approach 2:
The patent implements dynamic control of the demultiplexer circuit operation by adjusting the timing and duration of control signal pulses based on the actual data transmission requirements. The control lines are dynamically activated and deactivated rather than maintaining static voltage levels, which stabilizes voltage charging/discharging behavior and reduces unnecessary power consumption while preserving the reduced bezel area design.
2Area of stationary object
If demultiplexer circuits are used to reduce the number of channels of the driving IC, then the bezel area is decreased, but the voltage charging and discharging of control lines becomes unstable
Solution Approach 1:
By using periodic time-division control signals, the patent ensures that each control line is activated in a regular, predictable manner. This periodic activation pattern stabilizes the voltage charging and discharging behavior, preventing the instability that occurs with irregular or continuous control signals, while still maintaining the reduced bezel area advantage.
Solution Approach 2:
The patent maintains continuous useful action by ensuring that control lines are properly charged and discharged only when data transmission is actually occurring. The time-division control scheme ensures that each control line receives continuous attention during its active period, preventing voltage instability while minimizing unnecessary voltage transitions that would waste power.
3Device complexity
If the number of channels of the driving IC is reduced through data time division driving, then the device complexity is decreased, but power consumption increases for controlling the voltage of the control line
Solution Approach 1:
The patent resolves this contradiction by implementing periodic time-division control where each control line is activated only during its designated time slot. This periodic activation reduces the overall frequency of voltage transitions across all control lines compared to simultaneous activation, thereby lowering power consumption while maintaining the simplified device structure with fewer IC channels.
Solution Approach 2:
The patent applies segmentation by dividing the control of multiple data lines into separate time slots for each control line. Instead of all control lines operating simultaneously, they are segmented into distinct time periods, which reduces the cumulative power consumption of voltage charging and discharging operations while preserving the reduced channel count benefit.
Data Source
AI summary
A display apparatus includes first to third demultiplexer circuits respectively providing a data signal, supplied from a data driver, to three data lines. Each of the first to third demultiplexer circuits includes a switching unit providing the data signal to a corresponding data line of the three data lines on the basis of a voltage of a corresponding control line of first to third control lines, a voltage controller controlling the voltage of the corresponding control line in response to a corresponding time division control signal of first to third time division control signals and a corresponding auxiliary signal of first to third auxiliary signals which partially overlap the first to third time division control signals respectively, and a voltage discharger discharging the voltage of the corresponding control line.