Display Device Dynamic Reference Voltage HDR Control
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Solution Overview
Problem
Display devices face challenges in achieving a high dynamic range (HDR) effect, particularly in expressing luminance variations between frames, due to limitations in controlling drive current and reference voltages, leading to inaccuracies in luminance expression and potential screen abnormalities.
Innovation Solution
A display device comprising a display panel with a timing controller that receives and compares frame data to generate a luminance control signal, and a power supply that outputs multiple reference voltages, allowing the output luminance of pixels to be adjusted based on the level of these voltages, thereby maximizing the HDR effect by changing the drive current of driving transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single reference voltage is used for all pixels, then the circuit design is simple, but the luminance expression accuracy deteriorates when luminance varies greatly between frames
Solution Approach 1:
The single reference voltage is segmented into multiple reference voltages with different levels. The power supply unit generates a first reference voltage and a second reference voltage, allowing different pixels to receive different reference voltage levels based on their luminance requirements, thereby improving luminance expression accuracy without excessive complexity
Solution Approach 2:
The reference voltage system transitions from static (single fixed voltage) to dynamic (multiple selectable voltages). The selection unit dynamically selects between the first and second reference voltages based on frame luminance characteristics, enabling the system to adapt to varying luminance requirements while maintaining manageable complexity through controlled selection rather than full independence
2Adaptability or versatility
If drive current is not adjusted according to frame luminance, then the control circuit is simple, but the HDR effect cannot be maximized
Solution Approach 1:
The system implements feedback by comparing the luminance characteristics of current and previous frames through the selection unit. Based on this feedback, the system automatically adjusts the reference voltage level and consequently the drive current to appropriate pixels, maximizing HDR effect while keeping control logic manageable through rule-based selection
Solution Approach 2:
The system changes the reference voltage parameter from a fixed single level to multiple selectable levels (first and second reference voltages). This parameter change enables flexible adjustment of drive current to match frame luminance characteristics, achieving HDR effect without requiring complex real-time calculation circuits
3Measurement precision
If multiple reference voltages are generated and selected dynamically, then the luminance control precision is improved, but the power supply complexity increases
Solution Approach 1:
The power supply unit is segmented into distinct functional components: a generation unit that creates multiple reference voltages and a selection unit that chooses the appropriate voltage. This segmentation allows the system to achieve precise luminance control through multiple voltages while managing complexity by separating generation and selection functions into modular units
Data Source
AI summary
A display device includes: a display panel on which a plurality of pixels are disposed; a timing controller configured to receive Nth frame data and (N+1)th frame data and output a luminance control signal; and a power supply configured to output a reference voltage from a plurality of reference voltages each having a different level in response to the luminance control signal, in which output luminance of the plurality of pixels is determined according to the level of the reference voltage thereby maximizing an HDR effect.