Pixel Circuit Parallel Driving Units Gray Scale Control
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Solution Overview
Problem
Current display technologies face limitations in achieving a sufficient number of displayable gray scales, leading to inadequate color representation and potential inaccuracies in controlling light emitting currents, especially at low gray scales and low control voltages.
Innovation Solution
A pixel circuit design featuring multiple driving units connected in parallel, allowing for adjustable light emitting currents and brightness through time intervals and pulse amplitude control, which also reduces the frequency of control signals to enhance gray scale representation and reduce power consumption and design complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single driving unit is used to control light emitting current, then the circuit structure is simple, but the quantity of displayable gray scales is limited
Solution Approach 1:
The driving module is segmented into multiple driving units (first driving unit with first driving transistor, second driving unit with second driving transistor) connected in parallel. Each driving unit can independently control light emitting current through its own data signal and control signals, enabling multiple gray scale levels by combining different driving unit outputs while maintaining manageable circuit complexity through modular design
2Quantity of substance
If multiple driving units are used to increase gray scales, then the quantity of displayable gray scales increases, but the control signal frequency and power consumption increase
Solution Approach 1:
The patent employs periodic control signals (first control signal and second control signal) with specific time intervals to control the multiple driving units. By using time-division multiplexing where driving units are activated in sequence rather than simultaneously, the control signal frequency is effectively reduced compared to driving all units at once, thereby lowering power consumption while still achieving multiple gray scale levels through cumulative light emitting effects
3Quantity of substance
If multiple driving units are used to increase gray scales, then the quantity of displayable gray scales increases, but the design complexity increases
Solution Approach 1:
The multiple driving units share common control mechanisms and signal pathways. The first and second control signals serve multiple functions by controlling different driving units in a coordinated manner, and the time interval between signals provides a universal parameter for adjusting gray scales across all driving units. This multi-functionality reduces design complexity despite having multiple driving units
4Measurement precision
If the light emitting time is extended to improve low gray scale control, then the gray scale representation improves, but the power consumption increases
Solution Approach 1:
The patent dynamically adjusts the light emitting time of different driving units by controlling the time interval between the first control signal and second control signal. For low gray scale levels, the system activates driving units for shorter durations or in sequence rather than simultaneously, achieving precise gray scale control through dynamic time modulation while minimizing total power consumption by keeping driving units inactive when not needed
Data Source
AI summary
The present disclosure discloses a pixel circuit and a display panel. The pixel circuit includes a light emitting module and a driving module including at least two driving units connected in parallel. a quantity of displayable gray scales can be improved or increased by configuring at least two driving units connected in parallel in the driving module where the at least two driving units can each correspondingly configure a light emitting current so that a plurality of light emitting brightness of the light emitting module can be implemented by a sum of these light emitting currents.